外文翻譯----機械設(shè)計理論-機械設(shè)計(文件)
【正文】 p of work all is designs. Designs usually may divide into several explicit stages: (a) preliminary design。Mechanical design theory The mechanical design is a application technical science through design the new product or improves the old product to meet the human need. It involves all domain of the project technology, mainly research size of the product , basic idea of the shape and the detailed structure, also research question of manufacture , sale and use of the product in all aspects. They usually called designer or mechanical design engineer who carries on each kind of mechanical design work. The mechanical design is a creative work. Design engineer not only have the creativity in the work, but also have the deep elementary knowledge on mechanical drawing, kinematics, engineering material, materials mechanics and machine manufacture technology. As says above, the goal of mechanical design is the production can meet the human need. The invention, the discovery and technical knowledge itself certainly not necessarily can bring the advantage to the humanity, only when they are applied on the product can produce the benefit. Thus, we should realize whether people do need this kind of product before carry on the design in a specific product. The mechanical design must regard as a good opportunity for the mechanical designer to use creative ability carries on product design, the systematic analysis and formulate manufacture technology of the product. Grasping the project elementary knowledge is more important than memorizing some data and the formula. Merely using the data and the formula is insufficient to pletely decide all decision in a good design. On the other hand, they should carry on all operations precisely. For example, even if place a decimal point in wrong position, also can turn the correct design to wrong. New designs can have many flaws and problems unexpected, only these flaws and the question have been solved, can new product’s superiority be manifested. Therefore, a superior product born followed a higher risk at the same time. What should emphasize is that if designs itself does not request to use the brandnew method, it is not necessary to use the new method merely for the goal for transformation. In the preliminary stage of design, should allow designer fully to display the creativity, not restraint to each kind of restraint. Even if have many impractical ideas in early time, they can also be corrected before plan blueprint. Only in this way can not stop the innovation. Usually, must propose several sets of design proposals, and then perform the parison. It is possible that some ideas have been used in the final plan which is not accepted before. The psychologist frequently discusses the causes of how could people adapt to machine which operate. A designer’s personnel39。 (b) functional design。 (b) has not been able to foresee and to consider the dusk year possible reasonable use (for example to have the possibility, designs the personnel
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