Natural Frequency Test

  • Servo Hydraulic Vibratory Damper Test System
  • Precision system with controlled rotary actuator through servo hydraulic system.
  • Damper Hub is mounted on rotary actuator and represents the actual mounting condition.
  • Rotary actuator is excited through a servo value with known excitations.
  • Two accelerometers are mounted in phase, one on actuator and the other on Damper inertia ring. Which in turn acts as closed loop circuit.
  • The excitations exerted by the actuator are captured by the accelerometers.
  • As the ring is separated through elastomeric member there is a difference in phase between the excitations of two sensors.
  • At resonance the difference in phase is exactly 90 deg. Which determines the Natural frequency of the damper.

Axial Pull Test

  • Damper is mounted onto the fixture.
  • A force transducer is placed onto the damper.
  • A precisely controlled press is used to find out the axial force & the adhesive strength of the damper.
  • An indicator is connected to transducer and the maximum value is displayed.

Slip Torque Test

  • Torque applied under static condition on the damper elastic member by fixing either inertia ring or hub & gradually displacing the other to measure the Torsional bonding strength of the rubber element under assembly.
  • Damper Hub is mounted onto torque lever.
  • Damper Ring is fixed onto the torque transducer.
  • Torque is applied gradually onto the damper hub.
  • The amount of torque exerted is indicated by an indicator.
  • Sudden drop in the torque reading indicates slip between hub & ring.

Burst Testing

  • Damper is mounted onto locator through a motor.
  • Damper is run at 2.5 times the rated RPM of engine for 2 minutes.
  • Test is carried out to find out the structural integrity of the cast part and bond integrity of elastomer and the metal parts.
  • Shift in correlation mark is checked before and after test.

Hooke’s Joint Test

  • Viscous damper is excited on Hooke’s joint with angular excitation.
  • Temperature rise of the damper casing is measured.
  • Temperature rise should be linearly or gradual rise with respect to time.






10 °0.438 °
11 °0.531 °
12 °0.633 °
13 °0.744 °
14 °0.864 °

Torsio Test Rig

  • Damper mounted on rig and excited manually.
  • Decay in the amplitude level of the given excitation is monitored.
  • If decay in amplitude level observed, damper is functionally acceptable.
  • If damper ring is seized no decay in amplitude level is observed.