Dynamic Performance Analysis and Optimization Design of the Pulp-Molding Machine Frame

The pulp-molding product is a new degradable and pollution-free packaging material replacing traditional packaging materials. Countries are strongly recommending that pulp molding machines are mainly used to produce pulp-molding products. The stability, efficiency, and rapidity of its products’ molding and processing quality are largely controlled by the structural dynamic mechanics of the molding-machine frame. The first-order natural frequency, the fundamental frequency, is an important index to measure the dynamic performance of its equipment. The Pulp-Molding Machine Frame molding machine was taken as an example to analyze the dynamic performance and optimize the design in the work. Based on finite elements, the beam structure was divided into finite elements, and the global independent generalized displacement coordinates of the equipment were extracted using multi-point constraint elements. The elastic dynamic model of the device was established by combining the Lagrange equation and the global independent generalized displacement coordinates, and the correctness of the theoretical model was verified by the finite element method. Finally, taking the first natural frequency as the optimization-design goal, the section size of the beam in the equipment was optimized by the particle-swarm optimization algorithm. The results can be used to analyze the dynamic performance and optimize the design of the molding machine at the pre-design stage.