In this research, Ride quality of a three-axle truck is investigated to understand its vibrationspecifications and influence of it on special load. The truck is Benz 2624, and the load is rathersensitive to vibrations. The system is considered for an off-road duty. Hence, the vehicle is modeledas a nineteen-degree of freedom system and its equations of motion are derived by employingLagrange equation. Since, the physical parameters of the vehicle were not available; the truck ismodeled in Solidworks CAD software in order to obtain the material and dynamic properties ofeach component of the truck. Then, a code is developed in MATLAB to calculate naturalfrequencies and mode shapes of the truck and their corresponding vibrating components in criticalspeed. A simple model of the truck in ADAMS is employed for validation. The adoption of theresults verifies the equations. The developed model can also be used in newer truck with somemodifications. It is also necessary to have accurate data for input information in order to change thecurrent model for other utilities. تفاصيل المقالة

Initially, the first aim of the present study is to model 3-axle rigid truck by developing a code in Matlab. Secondly, each equation should be drived by acquisition of Lagrange approach. After deriving equations successfully, validation is performed by some result which was mentioned in Bohao Li's master thesis. Although the present approach is totally different from the approach that Boahao Li used in his analysis but the deviation of the present results from that thesis on average is 7 percent which shows an acceptable accuracy in our current numerical approach. In the present study 19 degree of freedoms is used for determining natural frequency and dominant motions. By having dominant motion, it is possible to clarify which region is in endangering of resonance. This paper presents a portion of the results that have been gathered and for watching new result in this field, it is recommended to read our future papers. Solidworks CAD software is also used to calculate mass properties of several components that used in our present study. تفاصيل المقالة