## NUMERICAL SIMULATION ON THE VIBRATION OF A TEST BED WITH ENGINE WITH DUAL MASS FLYWHEEL

Trans Motauto World, Vol. 3 (2018), Issue 1, pg(s) 49-51

This paper describes the results of numerical simulations of a vehicle engine with dual mass flywheel coupled with dynamometer. The differential equations of the model are given. The mass moments of inertia and the torsional stiffness are taking into account. Numerical simulations are carried out. Natural frequencies of the system are determinate. Bode diagrams of the system are shown and analysed. Recommendations to reduce vibration by using an additional flexible coupling are given.

## POSSIBILITIES FOR CONTROL OF SEMI-ACTIVE SHOCK ABSORBERS IN ORDER TO REDUCE CASES OF SUSPENSION JOUNCES WHEN BRAKING

Trans Motauto World, Vol. 3 (2018), Issue 1, pg(s) 19-20

In this work a model of a truck when braking is created. The model takes into account the deflections in the suspension and vibrations of the sprung mass. The differential equations of the model are worked out. Numerical experiments are performed and some results are given. It is shown that if the shock absorber damping ratio is increased when vehicle braking, it is possible to reduce the pitch angle and the jounces in the suspension.

## NUMERICAL SIMULATION ON THE VIBRATION OF A VEHICLE DRIVETRAIN WITH DUAL MASS FLYWHEEL

This paper describes the results of numerical simulations of a vehicle drivetrain model with dual mass flywheel. The differential equations of the model are given. The vehicle inertia, the tire torsional stiffness and the transmission gear ratios are taking into account. Numerical simulations with given mass, elastic and damping parameters are carried out. Natural frequencies of the system are determinate. Vibrational characteristics of the system are shown and analysed.

## VIBRATION CHARACTERISTICS OF QUARTER CAR SEMI-ACTIVE SUSPENSION MODEL – NUMERICAL SIMULATIONS AND INDOOR TESTING

Trans Motauto World, Vol. 2 (2017), Issue 1, pg(s) 11-16

This paper describes the results of numerical simulations and laboratory experiments of quarter car semi-active suspension model. Elastic characteristic of the coil spring and damping characteristics of the shock absorber in various operating modes are determinate. The amplitude-frequency characteristics and transfer function of the system with various damping coefficient are obtained. The results can be used to design semi-active suspension control strategy for improving ride comfort and road holding of ground vehicles.