பொறியியல்
கட்டற்ற கலைக்களஞ்சியமான விக்கிபீடியாவில் இருந்து.
பொறியியல் அல்லது எந்திரவியல் என்பது, மனித சமுதாயத்தின் தேவைகளுக்கு, அறிவியலின் பிரயோகமாகும். இது, அறிவு, கணிதம் மற்றும் செயல் அனுபவம் என்பவற்றைப் பயனுள்ள பொருள்களையோ, முறைகளையோ (process) வடிவமைப்பதன் மூலம் நிறைவேற்றப்படுகிறது. மேற்படி தொழிலிலீடுபட்டிருப்பவர்கள் பொறியியலாளர் எனப்படுகிறார்கள். எந்திரிகள் என்று அழைக்கப்படுவதும் உண்டு.
பொறியியலாளர்கள், விஞ்ஞானிகளுக்கும், சாதாரண மக்களுக்குமிடையே பாலமாகச் செயல்படுகிறார்கள். அவர்கள் அறிவியலை சாதாரண மனிதனிடம் கொண்டுபோகிறார்கள். ஒரு விஞ்ஞானி, "ஏன்....?" என்று கேட்டு, ஒரு திறந்தமுனை (open-ended) ஆய்வுவழியைக் கைக்கொள்கிறான். பொறியியலாளனோ, "எப்படி....? என்ற கேள்வியையே எப்பொழுதும் கேட்கிறான். அதாவது, கையிலுள்ள பிரச்சினைக்குரிய தீர்வை அறிந்துகொண்டு, அதனை நடைமுறைப்படுத்துவதற்கான வழிமுறைகளைக் காண முயல்கிறான்.
There is a difference between an engineer and a technologist though the terms are often used interchangeably. Once an engineer has found a solution for the problem at hand his work stops. The next phase is fine tuning the solution, which is in the domain of the technologist. This process is dependent on various factors which vary with time. A solution which could be a practical application of a scientific fact does not satisfy a technologist. He endeavours to bring it within the economic constraints so that the common man not only understands and marvels at science but also is able to enjoy it and lose his fear of it by constant interaction.
For example, when Edison developed the phonograph it was marveled at. That was engineering. But when he asked his assistant to develop it further so as to remove some harmonics from the sound, that was technology. Because only then could one listen to it and enjoy.
This also explains the time gap between a fact being understood by science, then being implemented by engineers, and then being available from the local shop.
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[தொகு] பொறியியலின் வேலை
The engineer must identify and understand the relevant constraints in order to produce a successful design. Constraints include available resources, physical or technical limitations, flexibility for future modifications and additions, and other factors such as requirements for cost, manufacturability, serviceability, and marketing and aesthetic, social, or ethic considerations. By understanding the constraints, engineers deduce specifications for the limits within which an object or system may be produced and operated. Engineering is therefore a contingent enterprise influenced by many considerations.
[தொகு] பிரச்சினைகளுக்குத் தீர்வுகாணல்
Engineers use their knowledge of science and mathematics, and appropriate experience, to find suitable solutions to a problem. Creating an appropriate mathematical model of a problem allows them to analyze it (perhaps, but exceptionally, definitively), and to test potential solutions. If multiple reasonable solutions exist, engineers evaluate the different design choices on their merits and choose the solution that best meets the requirements.
Engineers typically attempt to predict how well their designs will perform to their specifications prior to full-scale production. They use, among other things: prototypes, scale models, simulations, destructive tests, and stress tests. Testing ensures that products will perform as expected. Engineers as professionals take seriously their responsibility to produce designs that will perform as expected and will not cause unintended harm to the public at large. Engineers typically include a factor of safety in their designs to reduce the risk of unexpected failure.
[தொகு] கணனிகளின் பயன்பாடு
Computers, and design software, play an increasingly important role. Using Computer Aided Design (CAD) software, engineers are able to capture more information about their designs. The computer can automatically translate some models to instructions suitable for automatic machinery (e.g. CNC) to fabricate (part of) a design. The computer also allows increased reuse of previously developed designs by presenting an engineer with a library of predefined parts ready to be used in his own designs.
[தொகு] Etymology
It is a myth that engineer originated to describe those who built engines. In fact, the words engine and engineer (as well as ingenious) developed in parallel from the Latin root ingeniosus, meaning 'skilled'. An engineer is thus a clever, practical, problem solver. The spelling of engineer was later influenced by back-formation from engine. The term later evolved to include all fields where the skills of application of the scientific method are used. In other languages like Arabic, the word for "engineering" also means "geometry".
[தொகு] எனைய துறைகளுடனான தொடர்புகள்
Science attempts to explain newly observed and unexplained phenomena, often creating mathematical models of observed phenomena. Technology and engineering are attempts at practical application of knowledge (often from science). Scientists work on science; engineers work on technology. However, there is often an overlap between science and engineering. It is not uncommon for scientists to become involved in the practical application of their discoveries; thereby becoming, for the moment, engineers. Conversely, in the process of developing technology engineers sometimes find themselves exploring new phenomena, thus becoming, for the moment, scientists.
There are also close connections between the workings of engineers and artists; they are direct in some fields, eg architecture and industrial design, and indirect in all. Artistic and engineering creativity may be fundamentally connected.
Cost -- Quality | Dimensionless numbers | Electromagnetism governed by Maxwell's equations | Electrical circuit fundamentals | List of electronics topics | Engineering economics | Ethics | Liability | Measurement | Reverse engineering | Rheology | SI unit | Thermodynamics | Student Design Competition
See also: Fields of engineering (overview of engineering fields), Electronics related books
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