9ZM-5.0型饲用苎麻切碎机机架静力学、模态分析与结构优化

Static,Modal Analysis and Structural Optimization of 9ZM-5.0 Feeding-ramie Shredder Frame

9ZM-5.0型饲用苎麻切碎机专门设计了一种整体式多孔机架侧板,旨在减轻机架重量及改善机器整体装配性能。为了避免机架侧板在工作时出现结构强度问题及共振现象,以切碎机的机架侧板为研究对象,基于SOLIDWORKS和ANSYS软件对机架侧板模型进行静力学分析、结构优化及各阶模态分析。具体步骤如下:一是对机架进行静力学分析,根据静力学分析结果对机架侧板进行结构优化;二是比较优化前后机架的静力学特性,并对优化后机架进行模态分析。结果表明:优化后的机架在同等外力边界条件作用下,最大应力为29.99 Mpa,降低了35.06%;最大总位移变形量为0.1481 mm,降低了65.20%;Y方向的最大位移为-0.0498 mm,降低了80.99%,极大改善了机架的静力学特性。机架前6阶固有频率分布在13.7~39.5 Hz之间,前2阶集中在13.7~15.0 Hz之间,后4阶集中在33.0~39.5 Hz之间,其中,第5阶阵型变形量最大,为30.780 mm,对应的频率为37.825 Hz。研究结果为后续优化设计奠定了基础。

The 9ZM-5.0 feeding-ramie shredder is specially designed with an integral porous rack side plate,to reduce the weight of the rack and improve the overall assembly performance of the machine.In order to avoid structural strength problem and resonance problem of the shredder during working,the frame of the shredder is taken as the research object,and the static analysis and various modal analysis of the frame model were carried out based on SOLIDWORKS and ANSYS software.The specific steps were as follows:firstly,the static analysis of the frame was performed,and the machine frame structure was optimized based on the static analysis result;secondly,static characteristics were compared between the optimized frame and the optimized front frame,and modal analysis was carried on the optimized frame.The research results showed that the maximum stress of the optimized frame was 29.99 Mpa,which was reduced by 35.06%under the same external force boundary conditions;the maximum total displacement deformation was 0.1481 mm,which was reduced by 65.20%;the maximum displacement in the Y direction was-0.0498 mm,reduced by 80.99%,which greatly improved the static characteristics of the frame;the first 6 natural frequencies of the machine frame were distributed between 13.7 Hz and 39.5 Hz,the first 2 orders were concentrated between 13.7 Hz-15.0 Hz,and the last 4th order was concentrated between 33.0 Hz-39.5 Hz.Among them,the fifth-order array was the largest deformation,which was 30.780 mm,and the corresponding frequency was 37.825 Hz.The research results lay the foundation for the subsequent optimization design and provide a reference basis for it.