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78-540: George Bailey Brayton (1830–1892) was an American mechanical engineer and inventor. He was noted for introducing the constant pressure engine that is the basis for the gas turbine , and which is now referred to as the Brayton cycle . In 1872 George Brayton patented a constant pressure internal combustion engine , initially using vaporized gas but later using liquid fuels such as kerosene and oil , known as Brayton's Ready Motor , The engine used one cylinder for compression,

156-570: A megaphone and phonograph . International juries judged the various exhibits, awarding medals of gold, silver and bronze. One popular feature was a human zoo , called a "negro village", composed of 400 " indigenous people ". And Augustin Mouchot 's solar-powered engine converting solar energy into mechanical steam power, he won a gold medal in Class 54 for his works, most notably the production of ice using concentrated solar heat. Henry E. Steinway exhibited

234-560: A professional engineer or a chartered engineer . "Only a licensed engineer, for instance, may prepare, sign, seal and submit engineering plans and drawings to a public authority for approval, or to seal engineering work for public and private clients." This requirement can be written into state and provincial legislation, such as in the Canadian provinces, for example the Ontario or Quebec's Engineer Act. In other countries, such as Australia, and

312-516: A Kansas newspaper editor, as well as other generals, politicians, and celebrities. The United Kingdom, British India , Canada, Victoria , New South Wales , Queensland , South Australia , Cape Colony and some of the British crown colonies occupied nearly one-third of the space set aside for nations outside France. The United Kingdom's expenditure was defrayed out of the consolidated revenue; each British colony defrayed its own expenses. The UK display

390-580: A commercial product. Brayton cycle engines were some of the first engines to be used for motive power. In 1881 John Philip Holland used a Brayton engine to power the world's first successful self-propelled submarine, the Fenian Ram. Also the Selden auto of 1878 used a Brayton cycle engine. This design never actually ran. When the Brayton engine was applied to an omnibus in 1878 as part of a project between Brayton and

468-642: A course in an engineering trade like fitter from the Industrial Training Institute (ITIs) to receive a "ITI Trade Certificate" and also pass the All India Trade Test (AITT) with an engineering trade conducted by the National Council of Vocational Training (NCVT) by which one is awarded a "National Trade Certificate". A similar system is used in Nepal. Some mechanical engineers go on to pursue

546-452: A drafter or draftsman. Drafting has historically been a two-dimensional process, but computer-aided design (CAD) programs now allow the designer to create in three dimensions. Instructions for manufacturing a part must be fed to the necessary machinery, either manually, through programmed instructions, or through the use of a computer-aided manufacturing (CAM) or combined CAD/CAM program. Optionally, an engineer may also manually manufacture

624-517: A failure has occurred, or when designing to prevent failure. Engineers often use online documents and books such as those published by ASM to aid them in determining the type of failure and possible causes. Once theory is applied to a mechanical design, physical testing is often performed to verify calculated results. Structural analysis may be used in an office when designing parts, in the field to analyze failed parts, or in laboratories where parts might undergo controlled failure tests. Thermodynamics

702-880: A field during the Industrial Revolution in Europe in the 18th century; however, its development can be traced back several thousand years around the world. In the 19th century, developments in physics led to the development of mechanical engineering science. The field has continually evolved to incorporate advancements; today mechanical engineers are pursuing developments in such areas as composites , mechatronics , and nanotechnology . It also overlaps with aerospace engineering , metallurgical engineering , civil engineering , structural engineering , electrical engineering , manufacturing engineering , chemical engineering , industrial engineering , and other engineering disciplines to varying amounts. Mechanical engineers may also work in

780-411: A force applied) the object being analyzed either breaks or is deformed plastically , depending on the criterion for failure. Fatigue failure occurs when an object fails after a number of repeated loading and unloading cycles. Fatigue failure occurs because of imperfections in the object: a microscopic crack on the surface of the object, for instance, will grow slightly with each cycle (propagation) until

858-475: A glowing platinum igniter as a source for ignition and a metered pressurized injection system with an oil atomizing direct fuel injector (U.S. patent #432,114). Brayton states: “I have discovered that heavy oils can be mechanically converted into a finely divided condition within a firing portion of the cylinder, or in a communicating firing chamber.” Another part reads, “I have for the first time, so far as my knowledge extends, regulated speed by variably controlling

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936-513: A grand piano which "attracted extraordinary attention". Over 13 million people paid to attend the exposition, making it a financial success. The cost of the enterprise to the French government, which supplied all the construction and operating funds, was a little less than a million British Pounds, after allowing for the value of the permanent buildings and the Trocadéro Palace , which were sold to

1014-492: A machine is likely to work. Engineers may seek license by a state, provincial, or national government. The purpose of this process is to ensure that engineers possess the necessary technical knowledge, real-world experience, and knowledge of the local legal system to practice engineering at a professional level. Once certified, the engineer is given the title of Professional Engineer (United States, Canada, Japan, South Korea, Bangladesh and South Africa), Chartered Engineer (in

1092-516: A metallic building, an industrial showcase of low transverse arches, designed by the engineer Henri de Dion (1828–78). Many of the buildings and statues were made of staff , a low-cost temporary building material invented in Paris in 1876, which consisted of jute fiber, plaster of Paris , and cement . On the northern bank of the Seine River , an elaborate palace was constructed for the exhibition at

1170-583: A minimum of 4 years post graduate on the job competency development and a peer-reviewed project report to become a Chartered Mechanical Engineer (CEng, MIMechE) through the Institution of Mechanical Engineers . CEng MIMechE can also be obtained via an examination route administered by the City and Guilds of London Institute . In most developed countries, certain engineering tasks, such as the design of bridges, electric power plants, and chemical plants, must be approved by

1248-1011: A part using the technical drawings. However, with the advent of computer numerically controlled (CNC) manufacturing, parts can now be fabricated without the need for constant technician input. Manually manufactured parts generally consist of spray coatings , surface finishes, and other processes that cannot economically or practically be done by a machine. Drafting is used in nearly every subdiscipline of mechanical engineering, and by many other branches of engineering and architecture. Three-dimensional models created using CAD software are also commonly used in finite element analysis (FEA) and computational fluid dynamics (CFD). Many mechanical engineering companies, especially those in industrialized nations, have incorporated computer-aided engineering (CAE) programs into their existing design and analysis processes, including 2D and 3D solid modeling computer-aided design (CAD). This method has many benefits, including easier and more exhaustive visualization of products,

1326-414: A patent (granted in 1892) for another 4 stroke engine with an air blast fuel injection system ( U.S. patent# 432,260) . Rudolf Diesel's first engines used an air blast atomization system that was very similar to Brayton's . Unlike Diesel's engine Brayton's engine was fairly low compression. The ignition source was a constantly glowing mesh of platinum. Mechanical engineering Mechanical engineering

1404-406: A postgraduate degree such as a Master of Engineering , Master of Technology , Master of Science , Master of Engineering Management (M.Eng.Mgt. or M.E.M.), a Doctor of Philosophy in engineering (Eng.D. or Ph.D.) or an engineer's degree . The master's and engineer's degrees may or may not include research . The Doctor of Philosophy includes a significant research component and is often viewed as

1482-418: A receiver reservoir, and a separate power/expander cylinder in which the products of combustion expanded for the power stroke. The significant difference from other piston driven internal combustion engines is that the two cylinders are arranged so that the fuel/air mixture burns progressively at constant pressure as it is transferred from the compressor cylinder and reservoir to the working/expansion cylinder. In

1560-473: A separate field within engineering. They brought with them manufacturing machines and the engines to power them. The first British professional society of mechanical engineers was formed in 1847 Institution of Mechanical Engineers , thirty years after the civil engineers formed the first such professional society Institution of Civil Engineers . On the European continent , Johann von Zimmermann (1820–1901) founded

1638-459: Is an applied science used in several branches of engineering, including mechanical and chemical engineering. At its simplest, thermodynamics is the study of energy, its use and transformation through a system . Typically, engineering thermodynamics is concerned with changing energy from one form to another. As an example, automotive engines convert chemical energy ( enthalpy ) from the fuel into heat, and then into mechanical work that eventually turns

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1716-523: Is credited with the invention of the wheel by several, mainly old sources. However, some recent sources either suggest that it was invented independently in both Mesopotamia and Eastern Europe or credit prehistoric Eastern Europeans with the invention of the wheel The lever mechanism first appeared around 5,000 years ago in the Near East, where it was used in a simple balance scale , and to move large objects in ancient Egyptian technology . The lever

1794-426: Is the means by which mechanical engineers design products and create instructions for manufacturing parts. A technical drawing can be a computer model or hand-drawn schematic showing all the dimensions necessary to manufacture a part, as well as assembly notes, a list of required materials, and other pertinent information. A U.S. mechanical engineer or skilled worker who creates technical drawings may be referred to as

1872-1016: Is the study of physical machines that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science , to design , analyze, manufacture, and maintain mechanical systems . It is one of the oldest and broadest of the engineering branches . Mechanical engineering requires an understanding of core areas including mechanics , dynamics , thermodynamics , materials science , design , structural analysis , and electricity . In addition to these core principles, mechanical engineers use tools such as computer-aided design (CAD), computer-aided manufacturing (CAM), computer-aided engineering (CAE), and product lifecycle management to design and analyze manufacturing plants , industrial equipment and machinery , heating and cooling systems , transport systems, motor vehicles , aircraft , watercraft , robotics , medical devices , weapons , and others. Mechanical engineering emerged as

1950-1020: The Accreditation Board for Engineering and Technology (ABET) to ensure similar course requirements and standards among universities. The ABET web site lists 302 accredited mechanical engineering programs as of 11 March 2014. Mechanical engineering programs in Canada are accredited by the Canadian Engineering Accreditation Board (CEAB), and most other countries offering engineering degrees have similar accreditation societies. In Australia , mechanical engineering degrees are awarded as Bachelor of Engineering (Mechanical) or similar nomenclature, although there are an increasing number of specialisations. The degree takes four years of full-time study to achieve. To ensure quality in engineering degrees, Engineers Australia accredits engineering degrees awarded by Australian universities in accordance with

2028-462: The Continent . The Dutch mathematician and physicist Christiaan Huygens invented the pendulum clock in 1657, which was the first reliable timekeeper for almost 300 years, and published a work dedicated to clock designs and the theory behind them. In England, Isaac Newton formulated Newton's Laws of Motion and developed the calculus , which would become the mathematical basis of physics. Newton

2106-495: The Lenoir /Hugon engines, and the Otto & Langen atmospheric engine, but the liquid fueled Brayton engine had an advantage in not requiring a gas supply. The early Brayton gas engine had the engine speed governed by varying the point of cut-off for the admission of the combusted gases into the power cylinder, and the admissions of gas and air to the pump was similarly regulated to maintain

2184-510: The United States Military Academy in 1817, an institution now known as Norwich University in 1819, and Rensselaer Polytechnic Institute in 1825. Education in mechanical engineering has historically been based on a strong foundation in mathematics and science. Degrees in mechanical engineering are offered at various universities worldwide. Mechanical engineering programs typically take four to five years of study depending on

2262-525: The "New York and New Jersey Ready Motor Company". This is followed by a similar analysis of Simon's engine which was an adaptation of the Brayton engine made by Louis Simon & Sons, in Nottingham, UK and marketed as The Eclipse Silent Gas Engine . The Simon engine had an added complexity in that it injected some of the water/steam heated by the engine/exhaust into the engine. The indicator diagrams for this engine are also reported by Dugald Clerk and show that

2340-549: The "Principles and Practice" or PE (Practicing Engineer or Professional Engineer) exams. The requirements and steps of this process are set forth by the National Council of Examiners for Engineering and Surveying (NCEES), composed of engineering and land surveying licensing boards representing all U.S. states and territories. In the UK, current graduates require a BEng plus an appropriate master's degree or an integrated MEng degree,

2418-550: The 13th to 14th centuries. During the Islamic Golden Age (7th to 15th century), Muslim inventors made remarkable contributions in the field of mechanical technology. Al-Jazari , who was one of them, wrote his famous Book of Knowledge of Ingenious Mechanical Devices in 1206 and presented many mechanical designs. In the 17th century, important breakthroughs in the foundations of mechanical engineering occurred in England and

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2496-676: The Amelioration of the Condition of Blind People led to the worldwide adoption of the Braille System of touch-reading. The Paris firm of Gruel and Engelmann was known for its deluxe bookbindings. The Book of Hours is a Gothic Revival example, for which the celebrated Paris jeweler Alexis Falize (1811–1898) created a relief showing the Adoration of the Magi , surrounded by fantastic animals derived from

2574-469: The CD to the computer. Robotics is the application of mechatronics to create robots, which are often used in industry to perform tasks that are dangerous, unpleasant, or repetitive. These robots may be of any shape and size, but all are preprogrammed and interact physically with the world. To create a robot, an engineer typically employs kinematics (to determine the robot's range of motion) and mechanics (to determine

2652-510: The U.S. workforce was $ 80,580. The median income was highest when working for the government ($ 92,030), and lowest in education ($ 57,090). In 2014, the total number of mechanical engineering jobs was projected to grow 5% over the next decade. As of 2009, the average starting salary was $ 58,800 with a bachelor's degree. The field of mechanical engineering can be thought of as a collection of many mechanical engineering science disciplines. Several of these subdisciplines which are typically taught at

2730-414: The U.S., for example, are required by ABET to show that their students can "work professionally in both thermal and mechanical systems areas." The specific courses required to graduate, however, may differ from program to program. Universities and institutes of technology will often combine multiple subjects into a single class or split a subject into multiple classes, depending on the faculty available and

2808-429: The UK, no such legislation exists; however, practically all certifying bodies maintain a code of ethics independent of legislation, that they expect all members to abide by or risk expulsion. The total number of engineers employed in the U.S. in 2015 was roughly 1.6 million. Of these, 278,340 were mechanical engineers (17.28%), the largest discipline by size. In 2012, the median annual income of mechanical engineers in

2886-576: The United Kingdom, Ireland, India and Zimbabwe), Chartered Professional Engineer (in Australia and New Zealand) or European Engineer (much of the European Union). In the U.S., to become a licensed Professional Engineer (PE), an engineer must pass the comprehensive FE (Fundamentals of Engineering) exam, work a minimum of 4 years as an Engineering Intern (EI) or Engineer-in-Training (EIT) , and pass

2964-559: The United States it is common for mechanical engineering students to complete one or more internships while studying, though this is not typically mandated by the university. Cooperative education is another option. Future work skills research puts demand on study components that feed student's creativity and innovation. Mechanical engineers research, design, develop, build, and test mechanical and thermal devices, including tools, engines, and machines. Mechanical engineers typically do

3042-595: The ability to create virtual assemblies of parts, and the ease of use in designing mating interfaces and tolerances. Other CAE programs commonly used by mechanical engineers include product lifecycle management (PLM) tools and analysis tools used to perform complex simulations. Analysis tools may be used to predict product response to expected loads, including fatigue life and manufacturability. These tools include finite element analysis (FEA), computational fluid dynamics (CFD), and computer-aided manufacturing (CAM). Exposition Universelle (1878) The buildings and

3120-416: The addition of the water has little merit in terms of power production, the cooling of the gases and expansion of the steam compensating for each other. Because the Brayton engine had a slow progressive burn of the fuel/air mixture it was possible to maintain a pilot flame, and so the engine, once lit, needed no form of ignition system. The measured efficiency of the gas engine was intermediate between that of

3198-435: The city of Paris. The total number of persons who visited Paris during the time the exhibition was open was 571,792, or 308,974 more than came to the French metropolis during 1877, and 46,021 in excess of the visitors during the previous exhibition of 1867. In addition to the general impetus given to French trade, the revenue from customs and duties from the foreign visitors increased by nearly three million sterling compared with

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3276-510: The core mechanical engineering curriculum, many mechanical engineering programs offer more specialized programs and classes, such as control systems , robotics, transport and logistics , cryogenics , fuel technology, automotive engineering , biomechanics , vibration, optics and others, if a separate department does not exist for these subjects. Most mechanical engineering programs also require varying amounts of research or community projects to gain practical problem-solving experience. In

3354-429: The crack is large enough to cause ultimate failure . Failure is not simply defined as when a part breaks, however; it is defined as when a part does not operate as intended. Some systems, such as the perforated top sections of some plastic bags, are designed to break. If these systems do not break, failure analysis might be employed to determine the cause. Structural analysis is often used by mechanical engineers after

3432-428: The design or analysis phases of engineering. If the engineering project were the design of a vehicle, statics might be employed to design the frame of the vehicle, in order to evaluate where the stresses will be most intense. Dynamics might be used when designing the car's engine, to evaluate the forces in the pistons and cams as the engine cycles. Mechanics of materials might be used to choose appropriate materials for

3510-471: The direct discharge of liquid fuel into the combustion chamber or cylinder into a finely divided condition highly favorable to immediate combustion.” This was likely the first engine to use a lean-burn system to regulate engine speed and output. In this manner, the engine fired on every power stroke and speed and output were controlled solely by the quantity of fuel injected. Bosch later further developed this type of metered injection system. In 1890 Brayton filed

3588-401: The engineers George and James Fawcett the latter described the attempt as a 'complete failure'. The engine's cycle of operations including sectional drawings and indicator diagrams for both gas and petroleum fueled versions. Details of the way the liquid fuel was introduced are described over 11 pages of Dugald Clerk 's book Gas and Oil Engines . The petroleum engine in these tests was made by

3666-418: The entry point to academia . The Engineer's degree exists at a few institutions at an intermediate level between the master's degree and the doctorate. Standards set by each country's accreditation society are intended to provide uniformity in fundamental subject material, promote competence among graduating engineers, and to maintain confidence in the engineering profession as a whole. Engineering programs in

3744-537: The factory, robots have been employed in bomb disposal, space exploration , and many other fields. Robots are also sold for various residential applications, from recreation to domestic applications. Structural analysis is the branch of mechanical engineering (and also civil engineering) devoted to examining why and how objects fail and to fix the objects and their performance. Structural failures occur in two general modes: static failure, and fatigue failure. Static structural failure occurs when, upon being loaded (having

3822-472: The fairgrounds were somewhat unfinished on opening day, as political complications had prevented the French government from paying much attention to the exhibition until six months before it was due to open. However, efforts made in April were prodigious, and by 1 June, a month after the formal opening, the exhibition was finally completed. This exposition was on a far larger scale than any previously held anywhere in

3900-471: The field of biomedical engineering , specifically with biomechanics , transport phenomena , biomechatronics , bionanotechnology , and modelling of biological systems. The application of mechanical engineering can be seen in the archives of various ancient and medieval societies. The six classic simple machines were known in the ancient Near East . The wedge and the inclined plane (ramp) were known since prehistoric times. Mesopotamian civilization

3978-586: The first factory for grinding machines in Chemnitz , Germany in 1848. In the United States, the American Society of Mechanical Engineers (ASME) was formed in 1880, becoming the third such professional engineering society, after the American Society of Civil Engineers (1852) and the American Institute of Mining Engineers (1871). The first schools in the United States to offer an engineering education were

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4056-474: The following: Mechanical engineers design and oversee the manufacturing of many products ranging from medical devices to new batteries. They also design power-producing machines such as electric generators, internal combustion engines, and steam and gas turbines as well as power-using machines, such as refrigeration and air-conditioning systems. Like other engineers, mechanical engineers use computers to help create and analyze designs, run simulations and test how

4134-449: The formal name for the degree is "Mechanical Engineer", and the course work is based on five or six years of training. In Italy the course work is based on five years of education, and training, but in order to qualify as an Engineer one has to pass a state exam at the end of the course. In Greece, the coursework is based on a five-year curriculum. In the United States, most undergraduate mechanical engineering programs are accredited by

4212-493: The frame and engine. Fluid mechanics might be used to design a ventilation system for the vehicle (see HVAC ), or to design the intake system for the engine. Mechatronics is a combination of mechanics and electronics. It is an interdisciplinary branch of mechanical engineering, electrical engineering and software engineering that is concerned with integrating electrical and mechanical engineering to create hybrid automation systems. In this way, machines can be automated through

4290-678: The garden of the Trocadéro palace, while other pieces were on display in the Champs de Mars. Among the many inventions on display was Alexander Graham Bell 's telephone. Electric arc lighting had been installed all along the Avenue de l'Opera and the Place de l'Opera, and in June, a switch was thrown and the area was lit by electric Yablochkov arc lamps , powered by Zénobe Gramme dynamos. Thomas Edison had on display

4368-547: The global Washington Accord . Before the degree can be awarded, the student must complete at least 3 months of on the job work experience in an engineering firm. Similar systems are also present in South Africa and are overseen by the Engineering Council of South Africa (ECSA). In India , to become an engineer, one needs to have an engineering degree like a B.Tech. or B.E., have a diploma in engineering, or by completing

4446-430: The original version a gas/air mixture was created by a vapor carburetor , then compressed and stored in a reservoir where it was ignited and then introduced into an expansion cylinder. A metal gauze/mesh was used to prevent the combustion running back to the reservoir. However at times the mesh failed, leading to flash-back or explosion. In 1874 Brayton filed a patent for a liquid fuel injection system. In this version, fuel

4524-452: The place and university and result in a Bachelor of Engineering (B.Eng. or B.E.), Bachelor of Science (B.Sc. or B.S.), Bachelor of Science Engineering (B.Sc.Eng.), Bachelor of Technology (B.Tech.), Bachelor of Mechanical Engineering (B.M.E.), or Bachelor of Applied Science (B.A.Sc.) degree, in or with emphasis in mechanical engineering. In Spain, Portugal and most of South America, where neither B.S. nor B.Tech. programs have been adopted,

4602-537: The previous year. Concurrent with the exposition, a number of meetings and conferences were held to gain consensus on international standards. French writer Victor Hugo led the Congress for the Protection of Literary Property, which led to the eventual formulation of international copyright laws. Similarly, other meetings led to efforts to standardize the flow of mail from country to country. The International Congress for

4680-480: The remaining exhibition space divided among the other nations of the world. Germany was the only major country which was not represented, but there were a few German paintings being exhibited. The United States exhibition was headed by a series of commissioners, which included Pierce M. B. Young , a former United States Congressman and major general in the Confederate States Army and Floyd Perry Baker ,

4758-401: The reservoir pressure. The liquid fueled engine reported by Clerk only regulated the cut-off to the power cylinder, and used a pressure relief valve to limit the reservoir air pressure. The reservoir on the Brayton engine allowed it to be readily started if it remained pressurized, though Clerk states that "leakage and loss were so frequent that the apparatus was of little use." Brayton's engine

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4836-599: The seventh century BC in Meroe . Kushite sundials applied mathematics in the form of advanced trigonometry. The earliest practical water-powered machines, the water wheel and watermill , first appeared in the Persian Empire , in what are now Iraq and Iran, by the early 4th century BC. In ancient Greece , the works of Archimedes (287–212 BC) influenced mechanics in the Western tradition. The geared Antikythera mechanisms

4914-504: The stresses within the robot). Robots are used extensively in industrial automation engineering. They allow businesses to save money on labor, perform tasks that are either too dangerous or too precise for humans to perform them economically, and to ensure better quality. Many companies employ assembly lines of robots, especially in Automotive Industries and some factories are so robotized that they can run by themselves . Outside

4992-525: The subject of graduate studies or on-the-job training than undergraduate research. Several specialized subdisciplines are discussed in this section. Mechanics is, in the most general sense, the study of forces and their effect upon matter . Typically, engineering mechanics is used to analyze and predict the acceleration and deformation (both elastic and plastic ) of objects under known forces (also called loads) or stresses . Subdisciplines of mechanics include Mechanical engineers typically use mechanics in

5070-500: The tip of the Place du Trocadéro . It was a handsome " Moorish " structure, with towers 76 metres in height and flanked by two galleries. It had a Cavaillé-Coll organ which was inaugurated with a concert in which Charles Marie Widor played the premiere of his Symphony for Organ No. 6 . The building stood until 1937. On 30 June 1878, the completed head of the Statue of Liberty was showcased in

5148-487: The undergraduate level are listed below, with a brief explanation and the most common application of each. Some of these subdisciplines are unique to mechanical engineering, while others are a combination of mechanical engineering and one or more other disciplines. Most work that a mechanical engineer does uses skills and techniques from several of these subdisciplines, as well as specialized subdisciplines. Specialized subdisciplines, as used in this article, are more likely to be

5226-631: The university's major area(s) of research. The fundamental subjects required for mechanical engineering usually include: Mechanical engineers are also expected to understand and be able to apply basic concepts from chemistry, physics, tribology , chemical engineering , civil engineering , and electrical engineering . All mechanical engineering programs include multiple semesters of mathematical classes including calculus, and advanced mathematical concepts including differential equations , partial differential equations , linear algebra , differential geometry , and statistics , among others. In addition to

5304-404: The use of electric motors , servo-mechanisms , and other electrical systems in conjunction with special software. A common example of a mechatronics system is a CD-ROM drive. Mechanical systems open and close the drive, spin the CD and move the laser, while an optical system reads the data on the CD and converts it to bits . Integrated software controls the process and communicates the contents of

5382-410: The wheels. Thermodynamics principles are used by mechanical engineers in the fields of heat transfer , thermofluids , and energy conversion . Mechanical engineers use thermo-science to design engines and power plants , heating, ventilation, and air-conditioning (HVAC) systems, heat exchangers , heat sinks , radiators , refrigeration , insulation , and others. Drafting or technical drawing

5460-555: The world's first known endless power-transmitting chain drive . The cotton gin was invented in India by the 6th century AD, and the spinning wheel was invented in the Islamic world by the early 11th century, Dual-roller gins appeared in India and China between the 12th and 14th centuries. The worm gear roller gin appeared in the Indian subcontinent during the early Delhi Sultanate era of

5538-458: The world. It covered over 66 acres (270,000 m ), the main building in the Champ de Mars and the hill of Chaillot , occupying 54 acres (220,000 m ). The Gare du Champ de Mars was rebuilt with four tracks to receive rail traffic occasioned by the exposition. The Pont d'Iéna linked the two exhibition sites along the central allée . The French exhibits filled one-half of the entire space, with

5616-682: Was also used in the shadoof water-lifting device, the first crane machine, which appeared in Mesopotamia circa 3000 BC. The earliest evidence of pulleys date back to Mesopotamia in the early 2nd millennium BC. The Sakia was developed in the Kingdom of Kush during the 4th century BC. It relied on animal power reducing the tow on the requirement of human energy. Reservoirs in the form of Hafirs were developed in Kush to store water and boost irrigation. Bloomeries and blast furnaces were developed during

5694-582: Was an Analog computer invented around the 2nd century BC. In Roman Egypt , Heron of Alexandria (c. 10–70 AD) created the first steam-powered device ( Aeolipile ). In China , Zhang Heng (78–139 AD) improved a water clock and invented a seismometer , and Ma Jun (200–265 AD) invented a chariot with differential gears. The medieval Chinese horologist and engineer Su Song (1020–1101 AD) incorporated an escapement mechanism into his astronomical clock tower two centuries before escapement devices were found in medieval European clocks. He also invented

5772-660: Was available in both vertical and horizontal forms. A Brayton Engine is preserved in the Smithsonian Institution in the American History museum, and a later Brayton engine which powered one of John Philip Holland 's early submarines is preserved in the Paterson Museum in the Old Great Falls Historic District of Paterson, New Jersey . In 1887 Brayton constructed a 4 stroke engine that used

5850-695: Was displayed at the Centennial Exposition in Philadelphia in 1876, and the Simon variant was displayed at the 1878 Paris Exhibition , and for a few years was well regarded, but within a short time the Otto engine became more popular. However, it was considered the first safe and practical oil engine and also served as inspiration to George B. Selden . As a production engine the design evolved over time, and according to Henry de Graffigny in Gas and Petroleum Engines , it

5928-437: Was introduced as the air passed into the expansion cylinder, thus eliminating the explosion problem. Ignition remained a pilot flame. The principle was referred to as constant pressure combustion, and had been attempted without success by Sir William Siemens c1861 using a 4-cylinder engine with a separate combustion chamber. Brayton not only achieved success in making the constant pressure cycle work, but he also made and marketed

6006-505: Was reluctant to publish his works for years, but he was finally persuaded to do so by his colleagues, such as Edmond Halley . Gottfried Wilhelm Leibniz , who earlier designed a mechanical calculator , is also credited with developing the calculus during the same time period. During the early 19th century Industrial Revolution, machine tools were developed in England, Germany , and Scotland . This allowed mechanical engineering to develop as

6084-545: Was under the control of a royal commission, of which the Prince of Wales was president. The exhibition of fine arts and new machinery was on a very large and comprehensive scale, and the Avenue des Nations , a street 730 metres in length, was devoted to examples of the domestic architecture of nearly every country in Europe and several in Asia, Africa and America. The "Gallery of Machines" was

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