Apparatus and method for evaluating damping performance of vibration-damping devices

A damping performance evaluation method for vibration-damping devices comprising:

• a vibrating step wherein a hammer member is dropped from a predetermined height under gravitational action to directly or indirectly strike a vibration-damping device and apply oscillation force to said vibration-damping device;
• a double-strike preventing step wherein double-strike of said vibration-damping device with said hammer member is prevented by preventing said hammer member from dropping a second time upon rebound after initially striking said vibration-damping device;
• a vibration measuring step wherein vibration mode in a vibration zone vibrated by means of said oscillation force of said hammer is measured;
• and
• a sorting step wherein vibration-damping devices are sorted into good products and defective products on the basis of results of measurement in said vibration measuring step.

A vibration-damping device testing method wherein a damping performance evaluation method, which comprises:

• a vibrating step wherein a hammer member is dropped from a predetermined height under gravitational action to directly or indirectly strike a vibration-damping device and apply oscillation force to said vibration-damping device;
• a double-strike preventing step wherein double-strike of said vibration-damping device with said hammer member is prevented by preventing said hammer member from dropping a second time upon rebound after initially striking said vibration-damping device;
• a vibration measuring step wherein vibration mode in a vibration zone vibrated by means of said oscillation force of said hammer is measured;
• and a sorting step wherein vibration-damping devices are sorted into good products and defective products on the basis of results of measurement in said vibration measuring step, is implemented using a damping performance evaluation apparatus comprising:
• a support member adapted to detachably support a vibration-damping device in a state enabling the vibration-damping device to exhibit a damping effect thereof;
• a hammer member for applying oscillation force to the vibration-damping device, caused by means of gravitational action to descent to strike directly or indirectly the vibration-damping device supported by said support member;
• a double-strike preventing member for preventing said hammer member from dropping a second time due to rebound after initially striking the vibration-damping device, so as to prevent double-strike of the vibration-damping device by said hammer member;
• a vibration sensor installed at a vibration zone caused to vibrate through oscillation force applied by said hammer member, for outputting an electrical signal in response to vibration at the vibration zone;
• and a sensing member for sensing a vibration mode in the vibration zone on the basis of an output of said vibration sensor, at a point between production and shipment of vibration-damping devices.