Air suspension based on quasi-zero stiffness principle and structural design and optimization method thereof

Abstract

The invention discloses an air suspension based on the quasi-zero stiffness principle and a structural design and optimization method of the air suspension. The suspension comprises a magnetic negative stiffness mechanism and an air spring mechanism. The air spring mechanism comprises a membrane type air spring which is fixedly installed on the upper portion of the axle. The magnetic negative stiffness mechanism comprises a cylinder barrel and a piston rod, the cylinder barrel is arranged in the membrane type air spring, and the bottom of the cylinder barrel is connected with the inner bottom face in the membrane type air spring. The piston rod is fixed to the lower portion of the vehicle body and extends into the cylinder barrel. The cylinder barrel is provided with an electrified coil, and the piston rod is provided with an annular permanent magnet and an electromagnetic spring composed of the annular permanent magnet and the electrified coil. The magnetic negative stiffness mechanism is arranged in the membrane type air spring cavity, and the vibration isolation performance of the suspension is improved on the basis of the air suspension. Meanwhile, according to the design and optimization method, by optimizing the design parameters of the magnetic negative stiffness mechanism and the structural parameters of the air spring, the quasi-zero stiffness air suspension can generate large negative stiffness in a large area near the balance position.

Description

technical field [0001] The invention belongs to the field of automobile suspension and specifically designs an air suspension based on the principle of quasi-zero stiffness and a structural design and optimization method thereof. Background technique [0002] At present, on some special vehicles, such as instrument vehicles, special combat vehicles, ambulances, and container transport vehicles loaded with dangerous goods, which require higher anti-vibration performance, higher requirements are placed on the vibration isolation performance of traditional suspensions. [0003] The suspension system is related to the ride comfort and handling stability of the vehicle. The human body is most sensitive to low-frequency vibrations of 4-12.5Hz, so low-frequency input has a greater impact on the comfort of the suspension. Low-stiffness suspension can effectively absorb low-frequency vibrations, but it has a negative impact on the overall bearing capacity and handling stability of t...

AI Technical Summary

Problems solved by technology

Some patents, such as the quasi-zero stiffness vibration isolator with adjustable positive and negative stiffness described in CN201620730321.1, achieve quasi-zero stiffness through the positive and negative parallel connection of coil springs, which improves the vibration isolation performance, but is only suitable for small amplitude vibrations. The instability caused by the negative stiffness system under large amplitude is not considered, and multiple springs are used in the structure, and the quasi-zero stiffness is realized by using their series-parallel connection and mutual angle relationship. The structure is complicated, which is not conducive to the overall performance stability; In the quasi-zero stiffness vibration isolation system and vehicle described in CN201910227755.8, the negative stiffness is realized by the cylinder piston and the rack and pinion device. The overall structure is simple and more energy-saving, but the space occupied by the negative stiffness device, air spring and rack and pinion mechanism Larger, not conducive to installation on vehicles

Images