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Multiple frequencies constraints and analytical sensitivity methods were used in the structural optimization
design of the side plate of 4YK1860 vibrating screen to reduce the damage of side plate caused by high dynamic stress.
The mass of side plate of the vibrating screen was taken as object function, mode frequencies were regarded as state
parameters, size of the plate was used as the constraint parameter and an optimization criterion which is applicable to
solve this kind of problem was given. Meanwhile, sensitivity characteristics of variable parameters were considered
during the process of optimization. The results show that the optimization program with embedded analytical sensitivity
calculation methods is of a higher solving precision and with a more stable calculating process. After structure
optimization, the thickness of side plate to withstand large impact is increased, the thickness of stiffener and peripheral
angle is decreased, the mass of side plate is reduced by 7.75% and a better optimization effect is achieved. The analysis of
the optimal vibrating screen presents that the mass of vibrating screen decreases by 3.5%, elastic deformation frequency
which is close to the working frequency increases by 8.8% and the dynamic stress decreases by 48%. The natural
frequencies of vibrating screen are improved and modal frequency is far from the working frequency of the exciting
motor, stress concentration of vibrating screen is weakened and thus the structural stiffness and reliability of vibrating
screen are enhanced.