Acquisition of Equivalent Force Time History of Excavator Lower Frame and Arranging Method of Fatigue Test Spectrum
A technology of time history and acquisition method, applied in the field of machinery and equipment, can solve the problems of lack of lower frame and difficulty in sorting out the load spectrum.
Active Publication Date: 2020-02-07
CHANGAN UNIV
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[0005] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a method for obtaining the equivalent force time history of the lower frame of the excavator and arranging the fatigue test spectrum, so as to solve the lack of corresponding equivalent force time of the lower frame of the excavator in the prior art. The technical problem that the fatigue test load spectrum is difficult to organize due to the history acquisition method and the arrangement method of the fatigue test spectrum of the lower frame
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[0089] The lower frame 1 and the turntable 2 are connected by a slewing support 3 , driven by a hydraulic motor installed in the slewing support 3 , the turntable 2 can rotate in a horizontal plane relative to the lower frame 1 . A coordinate system is established at the geometric center of the lower frame 1 and at point R on the same horizontal plane as the four support wheels, and the x direction of the coordinate system is along the longitudinal symmetry axis of the lower frame, and the horizontal direction is positive to the right; the z direction is vertical to the ground upward Positive, then the y direction is set according to the right-hand rule, along the transverse axis of symmetry of the lower frame. figure 1 The working posture shown is called the digging posture, that is, the direction of the bucket points to the positive direction of the x-axis. When the turntable 2 rotates counterclockwise (+90°) or clockwise (90°) relative to the frame 1, it is called the unload...
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The invention provides excavator nether-frame equivalent-force time history acquisition and fatigue test spectrum arrangement methods. Oil cylinder force-time history, working attitudes and hinge point force-time history are combined, action force of the ground on a nether frame is respectively acquired under an excavation attitude and an unloading attitude, and is decomposed to support wheels, action force at the support wheels are equivalent to equivalent force in a vertical direction, transformation is carried out according to a working cycle of an excavator to obtain a program spectrum ofequal time at each support wheel of the nether frame, and equivalent transformation is carried out on the program spectrum to obtain a final fatigue test spectrum. According to the excavator nether-frame equivalent-force time history acquisition and fatigue test spectrum arrangement methods of the invention, a bench fatigue test can be carried out on nether-frame members, and test precision is improved; accuracy and reliability of the fatigue test spectrum are guaranteed through damage consistency correction; the program spectrum is equivalent to a constant amplitude spectrum through damage equivalent-transformation, and phase synchronization of the fatigue test spectrum is guaranteed; and the methods can be extended to equipment similar to the nether-frame, and an application range is wide.
Description
technical field [0001] The invention relates to the field of mechanical equipment, and relates to the acquisition of the equivalent force of the lower frame of an excavator and the fatigue test, and in particular to a method for acquiring the equivalent force time history of the lower frame of the excavator and sorting out the fatigue test spectrum. Background technique [0002] The structural failure of mechanical equipment is often not due to insufficient static strength, but fatigue cracks caused by the accumulation of fatigue damage leading to fatigue fracture. However, domestic manufacturers have not made breakthroughs in the research and development of key technologies such as fatigue strength tests under actual working conditions of excavators. Lack of fatigue tests under actual working conditions, it is difficult to improve the reliability research of excavator lower frame. In order to provide technical support for the durability design and optimization of the excav...
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IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 吕彭民李瑶向清怡王宝刚
Owner CHANGAN UNIV