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The prior designer can give an acceptable minimum score. If the total score is lower than the score, the scheme is feasible but not excellent. It needs to be redesigned and improved. The process is repeated and a series of schemes are obtained. And then select from the best; if the total score is greater than or equal to the lowest score, it means that the scheme is feasible and better, then the program can be output to make the final result, and can also be designed to obtain some Other feasible and better solutions. Then choose the best, and finally determine a best solution.
Stress Margin This indicator is used to evaluate whether the potential of gear materials is fully utilized. If the strength is only satisfied, but the calculated stress is much smaller than the allowable stress of the material, the material is wasted, and the calculated stress should be as close as possible to the allowable stress. This paper uses the ratio of the calculated stress to the allowable stress of the gear to measure this. Since the gear transmission is often multi-stage, it is necessary to consider which gear has the stress ratio of the gear as the measurement standard. In this paper, the minimum stress ratio is used, so the membership function of the stress margin is: 1=min(1/ 1c, 2/2c,, i/ic, where: i is the calculated bending stress and ic is the allowable bending stress.
Dynamic load In order to ensure the smoothness of the transmission, the dynamic load should not be restricted too much, and the dynamic load index is used to measure this. The dynamic load factor is: Kd=(P Pd)/P (P is the normal load and Pd is the additional dynamic load). According to the literature [3], there is an empirical formula: kd=1 v30, v=mnz1n2i16000cos (for the helix angle, mn For the normal modulus, generally kd<1.6. The dynamic load membership function 2 gives the dynamic load membership function.
After a feasible solution is obtained, the fuzzy set R={1, 2, 3, 4}T is calculated by the above membership function. The fuzzy set A={a1, a2, a3, a4} of the importance degree of each index is given by the expert or given by the user to reflect the user's emphasis on different indicators, and the comprehensive score of the scheme can be calculated b=4i =1ai.
Design examples and discussion design examples: Design a 300t disc blanking machine gear transmission system (transmission arrangement). It is known that the nominal pressure Pg=3000kN, the nominal pressure stroke Sp=35mm, the slider stroke S=110mm, the stroke number n=15 times/min, and the maximum torque on the crankshaft M[qp]=145kNm.