Design Of Heavy Truck's Air Suspension And Analysis For The Suspension System

With the high-speed development of domestic economy, our nation's road transportation will keep increasing quickly and continuously in a long period. Heavy trucks play an essential role in the economy construction for its merits, such as abundant sorts, comprehensive application. Usually the work conditions of the heavy truck is execrable, which is full of bend road, slope road;Truck must swerve with small radius, turn and brake high frequently , and it is also used under the condition of full-load vibration and striking, the vibration is serious, which is dangerous to drivers' body. In order to provide the heavy truck with high-speed ride comfort and quality of transit, at the same time decrease the disastrous impact to the road, advanced vehicle suspension technology has been investigated applied extensively in heavy truck industry.Aiming at the undeveloped air suspension system in our native automobile industry,this paper introduce the most popular heavy truck air suspension structures , analyze their merits as well as drawbacks. And conclude the air spring's inertial frequency,stiffness,analyze the whole vehicle's digital model based on the mutiple body theory,then take advantage of the ADAMS virtual prototype software to establish the front,rear air suspension system,tires,flexible body and vehicle assembly system in ADAMS/Car expert enviroment.Meanwhile the simulation of velocity,acceleration,power spectrum density of acceleration is finished.The random inpute from the road is taken account into the simulation. At the end of the paper,the location of the truck's saddle point is optimized due to the simulation results of acceleration's PSD. The theoritic computation validate the correct prototype model and the simulation results,which provide the designer who analyze and optimize heavy truck's air suspension system with a advanced ,effcient tool.