Quality spring model conceptual positive collision safety target setting

A Lumped Mass-Spring (LMS) model that uses a number of one-dimensional spring-damped elements and some concentrated masses that are representative of the body components to describe the mechanical properties of the front-facing collision deformation zone. Because the LMS model is simple in structure and has certain accuracy, it was favored at that time. With the development of computer technology, although the finite element vehicle model has been widely popularized in the current body development, due to the lack of complete geometric components and detailed material properties in the pre-research stage, the efficiency and calculation analysis of the occupant safety objectives are determined. In terms of aspect, the abstract LMS model has a better advantage than the pure finite element model, which can save a lot of time in the optimization design. Secondly, because there is no engineering prototype in the pre-research stage of the model, it needs future products in the early stage of vehicle body development. The performance of the model puts forward certain requirements, so the model can be used to carry out the conceptual positive collision safety target setting.

Based on the LMS model, some improvements were made to the model. The driver restraint system and the Hybrid III 50% male dummy were added to the model to analyze the acceleration and intrusion generated by the front structure of the vehicle directly in the LMS model parameter optimization design. The impact of the amount on the protection performance of the driver and passenger.

The establishment of the vehicle frontal collision LMS model, the definition of the vehicle and the important parameters of the R&D concept phase are selected to establish the LMS model geometry. It is necessary to obtain the vehicle definition condition and the conceptual stage general layout mathematical model. The geometric arrangement and driver positioning of the LMS model can be set by the initial vehicle definition parameters and the man-machine layout scheme. Among them, the geometric dimensions to be referenced include the front overhang length, the front wheel center coordinates, the front wheel radius, the front bumper arrangement, the radiator tank layout, the powertrain arrangement, the firewall and front floor arrangement, and the driver H point coordinates. , steering wheel and steering column arrangement.

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