Vibration Problems in Hydraulic Structures

摘要

The paper is concerned principally with the vibration of control gates and regulating valves commonly used in hydraulic structures, such as dams. The principal findings of twelve years of vibration investigations by the Army Engineers civil works activities are reported. The classical theory of vibration is reviewed to select those portions applicable to the subject. Evidence of Coulomb damping is demonstated, and the results of field tests are analyzed to determine the constant friction force. Both laboratory and field tests are reported. Emphasis is placed on exciting forces expected to be found in hydraulic structures. The Von Karman vortex trail, self-excitation involving reflecting pressure waves, and other hydraulic pulsating phenomena are discussed. Certain practical conclusions are drawn.