Statistical analysis of tropical disturbances over the South China Sea during 1997–2006

Abstract

Tropical disturbances over the South China Sea (SCS) during the period of 1997-2006 are analyzed using the Tropical Storm and Hurricane WX products. A total of 158 tropical disturbances were formed over the SCS from 1997 to 2006, with 54 developing tropical disturbances which developed into tropical depressions and 104 non-developing tropical disturbances which never developed into tropical depressions. The development rate of tropical disturbances into tropical depressions was 34.18% in these ten years. During the period of this study, total annual numbers of tropical disturbances and developing tropical disturbances over the SCS had significant decreasing trends; however, the development rate of tropical disturbances had an insignificant increasing trend.

Study on the Relation of Wheel Hub Bearing Preload and Natural Frequency by Dynamic Test

“…The natural frequencies vary with wheel hub bearing preloads. Also the wheel hub bearing preloads will affect the service life, rotation accuracy of bearing and the strength of vibration noise [2].…”