| Complex mechanical vibration will be generating when the rolling-Stock is running on the railway. To control the vibration , the rolling-stock must have the spring suspension device to limit the mechanical vibration and insure the rolling-stock running safety and improve the travel comfort especially in high speed and heavy load transportation case. There are many kinds of spring in spring suspension devices, but the most used spring in rolling-stock is cylindrical spiral spring. China Railway Department have made out related technical standard and document to analysis and design it though it is touch and hard job to design the cylindrical spiral spring by manual. So it is urgent necessary to develop a special CAD software.In this paper, the design thought and flowchart of special railway spring suspension CAD software has been deeply described and some resource codes and instances have been inserted. Main functions are as follow:1) According to the formula of spring and related technical standard and document, Parameter computation of spring suspension has been carry out in the visual C++ environment and the result have been saved to data base .2) The 3D model of spring suspension has been constructed by CAXA platform which parameters come from the data base we saved in the first part. It really provides convenience to evaluate and optimize the design result.3) Vibration analysis has been fulfilled by calling some math libraries and graphic libraries in MATLAB to plot graphics such as Velocity-time, displacement-velocity, step response, impulse response, gain-frequency and phase-frequency. We can know the capabilities of the spring system from the graphics.
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