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ADVICES OF DESIGNER

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Advice 2

about computation

Engineering Calculations in engineering played a key role. From their accuracy depends on the appearance of the car and its specifications. In the calculations should follow two basic classical Rules: Rule number 1 The results of calculation can not only use, but even consider until after the calculation will not proveren.Horosho if checking account is not the one who does it, and another person. Rule number 2 Even if the calculations are correct, calculation results Do not use , has not ruled out possible errors in input data and used formulas. Errors often creep into the formula for several reasons: 1. When you print a confused character variables and indices of the characters (subscript and superscript); 2. The authors of technical literature does not take into account the different dimensions of physical values ??(in a formula using centimeters and inches, pounds force and Newtons, etc.). curious example: In the old 70's on a course in descriptive geometry at the Moscow Aviation Institute, where this writer learned the basics of knowledge our teacher gave a good xtextbook, but the book contains many errors in notation and xindexes. On the puzzled questions of students, "Why can not fix typos?" The author replied as follows: "The clever student will find the error itself, and it will play in his favor, and a fool mistakes and not notice! " Now the formulas in the books - FORMULA NOT BELIEVE! . You can believe only simple in mathematical terms, the laws and their use should be need to understand their physical meaning. Such laws in mechanics are Newton's laws, conservation of energy, Hooke's law, the formula sopromata (stretching, compression, bending, twisting, stability ...), etc. In electrical engineering - is Ohm's law and other simple patterns. Formulas should be such that for calculations on them could have done even without a calculator. Especially a lot of mistakes in the ad hoc technical literature devoted enough narrow fields of technology (such as "transporters"). This is explained partly by the fact that the authors of books, knowing full well the technical and physical side of the subject, were uncomfortable with the mathematical expressions of these patterns, and sometimes especially do not hesitate to copy the formula from one workbook to another. In these cases it is necessary to understand the physical nature of the formula and bring it yourself, based on the classical laws of physics, the stability of which is beyond doubt. Results of any calculation (that results, not the calculation) must be test (identify), comparing them with characteristics closest analogues. For example, if you define power drive your car, compare the resulting value to the capacity of the closest analogue, the data is not in doubt.
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