Summary

OBJECTIVE: To provide a theoretical basis for the development and development of air spring vibration isolation system for ambulance brackets by studying the mechanical properties of a certain type of air spring. Methods: The force - displacement curve of air spring with different initial air pressure was tested under different frequency and amplitude excitation, and the influence of various factors on the vibration isolation performance of air spring was analyzed. Results: The dynamic stiffness of the air spring increases linearly with the increase of the initial air pressure. The dynamic stiffness of the air spring decreases with the increase of the excitation frequency, and decreases slightly with the increase of the amplitude. The change of the excitation signal does not affect the change of the dynamic stiffness during the initial pressure change. Conclusion: The air spring stiffness and bearing capacity and other parameters are more suitable for emergency vehicles in the stent bracket vibration isolation requirements.

introduction

As a secondary vibration damping device, it can reduce the vibration and shock caused by road roughness during the course of running. It can improve the emergency evacuation capability The comfort of the ride has an important role. Rubber, wire rope and other traditional passive vibration isolation device because of its stiffness is not adjustable, the inherent frequency of a series of problems, it is difficult to achieve the desired vibration isolation effect.

Air spring as an important new vibration relief components with the following outstanding advantages: low stiffness characteristics: stiffness stiffness characteristics; stiffness and damping of the adjustable; long working life. In addition, the air spring also has the advantages of small size, low quality, high frequency vibration and good sound insulation. Based on the above advantages, air spring in the emergency vehicle stretcher support vibration field has a broad application prospects.

The purpose of this paper is to study and analyze the mechanical properties of air springs. Which provides the theoretical basis and design basis for the development and development of the double vibration isolation vibration system of the stretcher bracket with air spring vibration isolation element.