Grease lubricated bearings needs adding grease periodically for keeping good condition. Sometimes bearings have abnormal temperature with over lubrication. We can avoid the situation with herring rotation sound of bearings on the greasing. That sound turn normal sound when bearings have appropriate lubrication. At the time we stop adding grease. As a result, we can avoid over lubrication. However, feeling of the sound are different with each person. Therefore we used visualization of sounds technology for t...
英字タイトル:
Activity of avoiding over lubrication for grease lubricated bearings

This report describes the effectiveness of the application of acoustic diagnosis using vibration data for nspecting rotating machines. We usually apply the vibration diagnosis for the inspection of rotating machines on CBM(Condition Based Maintenance). However, with the vibration diagnosis, sometimes we annot discover the cause of abnormal sounds fro m rotating machines. Therefore, we tried another iagnosis. We converted the vibration data to the acoustic data and then inspected the abnormal sounds. We se...
英字タイトル:
Application of Acoustic diagnosis for rotating machines

電動弁診断において弁の動作状況を表すグラフの波形を観察すると点検における着目点、劣化を監視する 必要のある個所などの情報を得ることができる。浜岡原子力発電所で経験した事例を紹介する。...

This paper describes effectiveness of applying acoustic diagnosis to the greasing work. When we hear abnormal sounds from grease lubricated bearings, we try greasing. As a result, usually abnorm al sounds fade away. But after a while sometimes the sounds appear again. Therefore we try greasing again. The sounds fade away at the time but later appear again. We try greasing again and agai n but the results are the same. By this time, the temperature of the bearing has increased a lot. If the temperature incr...
英字タイトル:
Acoustic diagnosis improves maintenance of grease lubricated bearings

This paper describes study of effectiveness of applying acoustic diagnosis to CBM(Condition Based Maintenance). We usually measure data of vibration of rotating machines with accelerometer to monitor the condition of it. This work is dangerous because we put the accelerometer near the rotating shaft of the machines by hand. Therefore we tried the non-contact sensing using a microphone of acoustic diagnosis and checked the data. As a result, we got the enou gh data for the monitoring safely.When rotating ma...
英字タイトル:
Acoustic diagnosis Improves work safety and reliability of CBM