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It is not easy to predict precisely the behavior of the suspension with large lateral compliance, considering only kinematic behavior of the suspension. It is necessary to estimate accurately the tire locus in the development of new car in order to secure the minimal and proper clearance between rear tire and rear wheel house. In this article the 5 link rear suspension with panhard rod was taken into account. At first we studied the kinematic behavior of the suspension in various conditions, for example double bump and roll, and then the lateral load compliance behavior of the suspension was studied. The results of each cases were compared to SPMD(suspension parameter measuring device) data. The compliance behavior was obtained by both the simulation of nonlinear large displacement analysis and the kinematic analysis with bush deformation. From the comparison between two cases we recognized that there are the differences between the analysis results.

In the early step of car development the safety is more and more important. During the car crash test, the Seat Belt is subject to large load. The buckle assembly resists the load that is applied to belt in the passive belt system. Belt system is basically important for improving the safety performance. So there are some regulations about belt system like the Seat Belt Anchorage Test which has to secure the safety during the crash of the car. Belt is flexible, so we may only consider the tension to design, but in case of buckle, if we establish the load condition in the wrong, the buckle is failed during the car crash test. We have to predict the applied load of the buckle so that we design it properly and securely. We can get the magnitude and direction of the load from basic caculation. If we apply this results in design, the buckle may fail in case of car crash.