小型玉米脱粒机机架模态分析与优化设计

林通; 张涛; 张莹; 尹毅; 邓兴旭; 庞有伦; 罗书强

Modal analysis and structural optimization design of small corn thresher frame

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DOI：10.7606/j.issn.1000-7601.2022.05.30

Key Words: corn thresher modal analysis sensitivity analysis multi\|objective optimization

Author Name	Affiliation
LIN Tong	College of Engineering and Technology, Southwest University, Chongqing 400715, China
ZHANG Tao	Chongqing Academy of Agricultural Sciences，Chongqing 401329，China
ZHANG Ying	Chongqing Academy of Agricultural Sciences，Chongqing 401329，China
YIN Yi	Chongqing Academy of Agricultural Sciences，Chongqing 401329，China
DENG Xingxu	College of Engineering and Technology, Southwest University, Chongqing 400715, China
PANG Youlun	Chongqing Academy of Agricultural Sciences，Chongqing 401329，China
LUO Shuqiang	College of Engineering and Technology, Southwest University, Chongqing 400715, China

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Abstract:

To avoid the resonance of small corn thresher frame with external excitation frequency and ensure the stability of the work, the frame of the small corn thresher was redesigned with multi\|objective optimization. Using ANSYS Workbench software to build a finite element model of the frame and simulate and analyze the first 6-order modes and vibration modes, it was concluded that the first 6-order natural frequency of the optimized front frame was 48.26~156.76Hz, and the first\|order natural frequency was close to the excitation frequency generated by the motor. The sensitivity analysis method was used to explore the factors and sequence that affect the first\|order natural frequency and quality of the rack, determine the optimal design factors, and establish a mathematical model of the factors and optimization goals. The central composite design (CCD) and optimal filling space design (OSF) methods were adopted for simulation. The simulation results showed that the structural parameters that affect the frequency in descending order were the thickness of the baffle plate, the thickness of the square steel and the side plate, the thickness of the blanking plate, the thickness of the air deflector, and the angle between the blanking plate and the air deflector. The quality optimization results of the two test methods were close, but CCD was better than OSF in improving the first\|order natural frequency. The CCD optimization scheme increased the first\|order natural frequency of the rack by 16.8%, and the quality was reduced by 17.1%. Finally, the natural frequency of the frame before and after the optimization was measured by a vibration analyzer. The actual value of the first order natural frequency of the frame after the optimization effect was 57.48 Hz, achieving the purpose of avoiding resonance. The whole machine operation process was stabler, safer and more reliable. The redesign provides a theoretical reference for optimization and improvement of related machines.