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1. A creative use of need of physical properties and control process.
2. Recognize functional loads and their significance.3. Anticipate unintentional loads.4. Devise more favorable loading conditions.5. Provide for favorable stress distribution and stiffness with minimum weight.6. Use basic equations to proportion and optimize dimensions.7. Choose materials for a combination of properties.8. Select carefully, stock and integral components.9. Modify a functional design to fit the manufacturing process and reduce cost.10. Provide for accurate location and noninterference of parts in assembly.Machinery design covers the following contents.
1. Provides an introduction to the design process , problem formulation ,safetyfactors.2. Reviews the material properties and static and dynamic loading analysis , Including beam , vibration and impact loading.
3. Reviews the fundamentals of stress and defection analysis.4. Introduces fatigue-failure theory with the emphasis on stress-life approaches tohigh-cycle fatigue design, which is commonly used in the design of rotation machinery.5. Discusses thoroughly the phenomena of wear mechanisms, surface contactstresses ,and surface fatigue.6. Investigates shaft design using the fatigue-analysis techniques.7. Discusses fluid-film and rolling-element bearing theory and application8. Gives a thorough introduction to the kinematics, design and stress analysis of spurgears , and a simple introduction to helical ,bevel ,and worm gearing.9. Discusses spring design including compression ,extension and torsion springs.10. Deals with screws and fasteners including power screw and preload fasteners.11. Introduces the design and specification of disk and drum clutches and brakes.Machine DesignThe complete design of a machine is a complex process. The machine design is acreative work. Project engineer not only must have the creativity in the work, but alsomust in aspect and so on mechanical drawing, kinematics, engineerig material, materialsmechanics and machine manufacture technology has the deep elementary knowledge.One of the first steps in the design of any product is to select the material from whicheach part is to be made. Numerous materials are available to today's designers. Thefunction of the product, its appearance, the cost of the material, and the cost offabrication are important in making a selection. A careful evaluation of the properties ofa. material must be made prior to any calculations.Careful calculations are necessary to ensure the validity of a design.
In case of anypart failures, it is desirable to know what was done in originally designing the defectivecomponents. The checking of calculations (and drawing dimensions) is of utmostimportance. The misplacement of one decimal point can ruin an otherwise acceptableproject. All aspects of design work should be checked and rechecked.The computer is a tool helpful to mechanical designers to lighten tedious calculations, and provide extended analysis of available data. Interactive systems, based on computercapabilities, have made possible the concepts of computer aided design (CAD) andcomputer-aided manufacturing (CAM). How does the psychologist frequently discusscauses the machine which the people adapts them to operate. Designs personnel''s basicresponsibility is diligently causes the machine to adapt the people. This certainly is not aneasy work, because certainly does not have to all people to say in fact all is the mostsuperior operating area and the operating process. Another important question, projectengineer must be able to carry on the exchange and the consultation with other concernedpersonnel. In the initial stage, designs the personnel to have to carry on the exchange andthe consultation on the preliminary design with the administrative personnel, and isapproved. This generally is through the oral discussion, the schematic diagram and thewriting material carries on.If front sues, the machine design goal is the production can meet the human need theproduct. The invention, the discovery and technical knowledge itself certainly notnecessarily can bring the advantage to the humanity, only has when they are applied canproduce on the product the benefit. Thus, should realize to carries on before the design ina specific product, must first determine whether the people do need this kind of productMust regard as the machine design is the machine design personnel carries on usingcreative ability the product design, the system analysis and a formulation productmanufacture technology good opportunity. Grasps the project elementary knowledge tohave to memorize some data and the formula is more important than. The merely servicedata and the formula is insufficient to the completely decision which makes in a gooddesign needs. On the other hand, should be earnest precisely carries on all operations. Forexample, even if places wrong a decimal point position, also can cause the correct designto turn wrongly.A good design personnel should dare to propose the new idea, moreover is willing toundertake the certain risk, when the new method is not suitable, use original method.Therefore, designs the personnel to have to have to have the patience, because spends thetime and the endeavor certainly cannot guarantee brings successfully. A brand-newdesign, the request screen abandons obsoletely many, knows very well the method for the people. Because many person of conservativeness, does this certainly is not an easymatter. A mechanical designer should unceasingly explore the improvement existingproduct the method, should earnestly choose originally, the process confirmationprinciple of design in this process, with has not unified it after the confirmation new idea.