ジャークセンサによる転がり軸受の損傷診断に関する研究（第1報，ジャークセンサ検出による低回転時の振動信号の特長）

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Jerk is a derivative of acceleration. The authors had developed a piezoelectric jerk sensor. This study shows an example of application for the sensor. This paper finally shows essence of difficulty to diagnose bearing failure in low speed rotation. This first report acts as a very important introduction to the next second report which is going to propose and discuss a novel diagnosis method. Conventional diagnosis method for rotation machine usually uses acceleration sensor monitoring machine vibration. This paper proposes to use jerk sensor to diagnose roller bearing failure. Superiority of jerk sensor to acceleration sensor, for monitoring cyclic impulsive vibrations due to bearing failure, is shown by experiment. By observing the obtained impulsive vibration signal in detail, the facts that main frequency component is the natural frequency of the sensor element, and that natural frequency of bearing structure is little observed since excitation force caused by collision between bearing failure and roller element is too small to sufficiently propagate to the detection sensor element are shown. Another fact that dropouts of the cyclic impulsive vibration sometimes happen for low speed rotation, since it is sometimes not enough for the sensor to detect clearly the impulsive vibration when the rotation speed is very low is also shown. These facts tell us that conventional diagnosis methods using band path filter whose effective band is set around natural frequency of bearing structure, are not valid for the case, and require new diagnosis method which is able to work in the situation.

ジャークセンサによる転がり軸受の損傷診断に関する研究（第1報，ジャークセンサ検出による低回転時の振動信号の特長）

スポンサーリンク

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スポンサーリンク