5 May, 2014

Mechanical Systems

What exactly is a mechanical engineers role in construction of something like a bridge, I’m not sure exactly what they do. And so today I found out that… Mechanical Engineers: Structural analysis Main articles: Structural analysis and Failure analysis 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 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 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 mainly used by mechanical engineers after a failure has occurred, or when designing to prevent failure. Engineers mainly use online documents and books such as those published by ASM to aid them in determining the type of failure and possible causes. Structural analysis may be used in the office when designing parts, in the field to analyze failed parts, or in laboratories where parts might undergo controlled failure tests. ——————————————————— Mechanical engineering is a discipline of engineering that applies the principles of physics and materials science for analysis, design, manufacturing, and maintenance of mechanical systems. It is the branch of engineering that involves the production and usage of heat and mechanical power for the design, production, and operation of machines and tools. It is one of the oldest and broadest engineering disciplines. The engineering field requires an understanding of core concepts including mechanics, kinematics, thermodynamics, materials science, structural analysis, and electricity. Mechanical engineers use these core principles along with tools like computer-aided engineering and product lifecycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices, and others. Mechanical engineering emerged as 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. Mechanical engineering science emerged in the 19th century as a result of developments in the field of physics. The field has continually evolved to incorporate advancements in technology, and mechanical engineers today are pursuing developments in such fields as composites, mechatronics, and nanotechnology. Mechanical engineering overlaps with aerospace engineering, building services engineering, metallurgical engineering, marine engineering[disambiguation needed], civil engineering, electrical engineering, petroleum engineering, manufacturing engineering, and chemical engineering to varying amounts. ————————————————————– Concerning the construction of the bridge: You may download this PDF and study it. A Mechanical Engineer will deal with the dynamic analysis of the structure, the reaction of the structure to an earthquake and generally speaking, with anything that moves or may move. He will also deal with the machinery that will operate on the site, taking decisions about everything that has to do with the good functioning and repairing of that.

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1 Comment

  1. Depressed Hall935 May 4, 2014 at 12:32 am #
    There are so many roles in mechanical engineering 1) design - who design the bridge 2) planning engineer who make the schedule for complition 3) purchase engineer who arrange the materials 4) production engineer who handle production activity as per planning 5) supervisor who look after the production and workers 6) testing engineer 7) safety engineer. . . . . etc. . .