Abstract:  In order to improve the bearing capacity and service life of the crankshaft, optimization design and dynamic performance study were carried out for the key parameter of the crankshaft support span. To this end, first, according to the actual working load of the crankshaft, two methods of traditional design and Kadan formula design were used to design the span, and then the span and shaft length were optimized by multiparameters through the DOE algorithm. Secondly, modal analysis and harmonic response analysis were performed on the optimized design of the crankshaft and its components, and the finite element analysis results of each order of natural frequencies and the harmonic response diagram of the displacement with frequency were obtained. Finally, a test platform was built, noise and vibration tests of similar compressor products were carried out, and the simulation results were verified with the test results. The research results show that the maximum displacement of the crankshaft components is significantly reduced when comparing with the maximum value of the crankshaft displacement change, and resonance could be effectively avoided under working conditions. Comparing with the original compressor, the noise value of the compressor after the crankshaft optimization is reduced by 1.4dB(A), the vibration value is reduced by 0.43m/s2, the noise and vibration are stable, the fluctuation is small, and the performance is effectively improved.

Key words:  DOE algorithm; parameter optimization; harmonic response analysis; experimental comparison

YE Chang, JI Jin-jun, HU Bo, et al. Optimal design and dynamic performance of crankshaft support span based on DOE algorithm［J］.Journal of Mechanical & Electrical Engineering, 2021,38(8):1023-1029.