Analysis And Research On Mechanism Of The Damage To Goods With The Consideration To Road Surface Roughness

It’s very important to investigate the dynamical characteristics of packaging-goods system and do research on mechanism of the damage to goods for packaging and product design. Traditionally, the product is modeled as a lumped mass, neglecting the complex configuration of most products and road surface roughness.In fact, the packaging-goods system and the vehicle system constitute a complex product-transport-system via the coupling packaging-vehicle interface. In this paper, considering different packaging model, vehicle-packaging and air conditioning system is established. Based on that the dynamical characteristics and mechanism of the damage to pipelines are investigated.Firstly, the road roughness B model is obtained, meanwhile, it is verified that it’s right. Considering the stiffness and damping of the tires and suspension, vehicle with MDOF is established. Not only are anisotropic characteristics of polystyrene foam, corrugated paperboard and honeycomb paperboard being analyzed based on compression test, but also accurate physical parameters of packaging materials is obtained. Based on the results, MNF models of the three packaging are established, the same way, pipelines model which is later proved right is also considered as the flexible body.Vehicle-packaging-goods rigid-flexible coupling model is achieved in ADAMS and the coupling packaging-vehicle interface is simulated by multi-point contact force which has effect on acceleration RMS value of the centroid on pipelines.Resonance may occur for the reason that the second peak acceleration of the centroid on pipelines occurs at the excitation frequency lOHz which is approximate to the natural frequency10.15Hz. The piping stress analysis shows that the maximum VON-MISES stress occurs in the four-way valve connecting with the elbow pipe. Finally, A new method of evaluating the cushion performance of packaging during transportation is proposed.