Performance result of abserver® by shaking experiment
By shaking experiment in the Japanese public institution, it is proved that abserver® can decrease to up to 90% for a giant earthquake wave.

Result of shaking experiment

    result of three-dimensional vibration experiment

abserver® vs ball-type vs
no isolating device

    abserver: moderately decreased for slightly small vibratingImage

    Performance of abserver® for the Noto earthquake wave


    ball type isolating device: Because of no ability for decrement, it produces a resonance, then occurs bigger shaking than input accelerationImage

    Performance of "ball type" seismic isolator for the Noto earthquake wave


    abserver: fairly decreased for big vibratingImage

    Performance of abserver® for the Kobe earthquake wave


    no isolating device: always producing bigger shaking than input accelerationImage

    Performance of "no isolating device" for the Kobe earthquake wave

Comparison with a ball-type base isolation stand
by demonstration experiments to verify the effectiveness of each devices

Image

before

Image

after

As the result of vibration experiments, the normal ball-type continued to shake, and the problem not to come back to an original position occurred even after the vibration stand stopped.
Because the ball-type device has low damping force, it may cause a resonant amplification and big shaking more than expected when matching the direction of the earthquake wave with the direction where a isolation stand was restored.

→Movie of the Noto earthquake wave →Movie of the Kobe earthquake wave

Comparison of a base isolation performance between marble(abserver) and ball type devices

Comparison of base isolation performance Image

Base Isolation Stand of a ball-type device continues shaking after a earthquake stopped.

Because the restoring force strongly acts with the ball-type device, it continues shaking after a earthquake stopped. It continues working like a pendulum due to the lack of damping force.
However, the marble type bearing can stop shaking immediately after an earthquake stopped because it has a damping force.

When an earthquake is happened, the isolation device of marble type can be damping the vibration by a friction effect of the marble bearing.
Abserver® is able to gradually add to resistance without suddenly producing frictional resistance by means of the isolated plate of the polyhedron covering a marble bearing.
By this proof experiment, abserver® was able to reduce input wave of 1100gal (seismic intensity of 7 super class) to 140gal (seismic intensity 4 to 5).

It is confirmed that abserver® is high-performance isolation device which the collapse of base-isolation object and the malfunction of isolation device itself do not cause.