<div class="htmlview paragraph">This paper reports a numerical simulation method for suppressing abnormal vibration on the cab caused by torsional vibration on the powertrain, using a mechanical dynamics analysis software.</div> <div class="htmlview paragraph">The simulation model for the numerical analysis is adopted to the powertrain. Seven design parameters were selected and optimized to minimize the acceleration of the vibration by using Design of Experiment (DOE). Validation tests were conducted on the optimized model, and a good agreement was achieved between the test results and the calculated ones. This new design has helped us a lot to save weight, cost and time by narrowing down design change proposals.</div>