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新型破碎机是由薄板等型材焊接而成的柔性结构,在动力激励下引发其薄壁件的振动,辐射噪声。为研究其在正常工况下的动态性能,运用有限元模态分析法对主要构件进行分析,得到其前几阶固有频率,找到了振动过大的原因。为了提高机械破碎的效率,以结构件筛理表面积为目标函数,以板材的厚、构件宽、构件长为设计变量,以第1阶固有频率为约束变量,进行结构参数优化设计,并以得到的面积值为约束,以第1阶固有频率最大为目标函数继续优化,得到破碎机主要参数的最佳值。经分析优化前后的振动烈度,表明优化后的效果较好。
The new crusher is welded by the sheet metal and other flexible structure, under the excitement of the power of its thin-walled parts of the vibration, radiation noise. In order to study its dynamic performance under normal operating conditions, the finite element modal analysis was used to analyze the main components and the natural frequency of the first few orders was obtained. The reason for the excessive vibration was found out. In order to improve the efficiency of mechanical crushing, taking the screening surface area as the objective function, taking the thickness, width and length of the plate as the design variables, the first-order natural frequency is used as the constraint variable to optimize the structural parameters, Of the area value of the constraint, to the first natural frequency maximum as the objective function continue to optimize the crusher the main parameters of the best value. After analyzing the vibration intensity before and after optimization, it shows that the optimized effect is better.