Research & Development

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.

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.