| TY-1heavy dump truck is a kind of special engineering vehicles,commonly used on bad roads and in poor working environment such as mines,construction sites and so on. The vehicle in such circumstances may exhibit verypoor ride comfort. As people’s living standards and constantly raise, besidespower and economy, commercial vehicles’ ride comfort are getting more andmore attention. As the main system of modern automobile assembly, thesuspension system’s main role is ensure that the main bearing system of car withelastic link between the wheel or axle, and it is closely related to the ridecomfort.The mass distribution coefficient of most modern automobile suspension isclose to1,this means the vibration of the front and rear axle load quality in thevertical direction is independent of each other. The cab is just above front axle,compared with rear suspension, front suspension’s vibration of frequency offsethas more effect on cab comfort. So it is more important to improve frontsuspension.in order to improve economic efficiency, the driver usually drive faster than before after unloading on his way back, the reduce of axle load andthe increase of speed leads to poor ride comfort.According to the problem of inconsistent ride comfort while engineeringtruck is empty or full loaded, relying on the project of high tech industry ofShanxi Province--Special engineering truck development, this paper will takeimprovement of vehicle ride comfort, proposed the design of two level variablestiffness for the front suspension leaf spring.According to the benchmark model parameters, this paper designed twolevel stiffness for this leaf spring, and definite when will vice leaf work.Designed geometrical parameters of leaf spring on the basis of stiffness formula,and established3D model in CATIA to analysis in the finite element analysissoftware. Analysis results show that the reed clamping the main spring assemblyand assembly can meet the design requirements in stiffness.In order to establish a reliable rigid flexible coupling multi-body dynamicvehicle model in the ADAMS, this paper makes a flexible frame model of TY-1dump truck. Verified the cab and frame of the finite element model of reliabilityby comparing the results of cab and frame modal analysis and modal test results,and verified the credibility of MNF file of cab and frame at the same time.According to the real vehicle test and simulation objectives, simplified the fullvehicle model. Finally built the rigid flexible coupling model TY-1dump truck,which contains cab, cab suspension, frame and front suspension subsystem andso on. This paper have had a ride comfort test of TY-1dump truck on the site road,and install acceleration sensors on the key point of test vehicle to obtain the keycomponents and key nodes’ vibration. Experimental results showed that the ridecomfort of dump truck with full load is better than it is empty; The unload truckperformances poor ride comfort on site road.To validate the multi-body dynamics full vehicle model, this paper put theroad test and real vehicle acceleration signal of front and rear axle into thecorresponding parts of the multi-body dynamics model of TY-1type dump truck,and then output of the vibration acceleration signal of Z to the cab floor of ridecomfort simulation of the model. Verified the reliability of rigid flexiblecoupling model of TY-1dump truck by comparing the cab floor vibration ofacceleration curve of test and Simulation. After verified the reliability of themodel, had a ride comfort simulation to the dump truck model assembled withnew or original leaf spring under the acceleration signal of no-load high speedreturn working conditions. By comparing each cab floor vertical vibrationacceleration curve and root mean square value, proved the superiority of newspring in response to the unload-high speed return situation. |
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