A Frequency Response Function Identification Method for Mechanical Equipment Structures in Operating State
A frequency response function and operating state technology, applied in the testing of machines/structural components, digital control, measuring devices, etc., can solve problems such as the inability to obtain the frequency response function matrix and the inability to normalize the mode shapes, and achieve reliable sex high effect
Inactive Publication Date: 2019-01-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
The OMA method can identify the natural frequency and damping ratio only through the output signal, but because the input signal is unknown, the mode shape cannot be normalized, so the frequency response function matrix of the structure cannot be obtained
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[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0019] The method for identifying the frequency response function in the operation of mechanical manufacturing equipment according to an embodiment of the present invention preferably takes a machine tool as an example. The method specifically includes the following steps:
[0020] (1) Experimental modal analysis experiment (EMA) is carried out on the mechanical structure, and the frequency resp...
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The invention discloses a method for identifying a frequency response function of a mechanical equipment structure in an operation state, wherein a frequency response function is obtained through combining an inherent frequency and a damping ratio of a structure through identification according to a working modal analysis method and a modal vibration mode of the structure through identification according to an experiment modal analysis method. The method comprises the steps of (1), performing an experiment modal analysis experiment on the equipment, and obtaining a modal vibration mode of the structure; (2), performing a working modal analysis experiment on the equipment, and obtaining the inherent frequency and damping ratio of the structure; and (3), combining the modal vibration mode obtained in (1), and the inherent frequency and damping ratio obtained in (2) according to a certain mode, thereby obtaining the frequency response function in the working state of the structure. The frequency response function identification method compensates a defect of incapability of obtaining the frequency response function of the structure according to an existing working modal analysis method, and furthermore improving practicability of an OMA method.
Description
technical field [0001] The invention belongs to the field of dynamic analysis of mechanical equipment structures, and more specifically relates to a frequency response function identification method under the operating state of mechanical equipment mechanisms. Background technique [0002] Compared with the static state, the dynamic characteristics of the structure of the mechanical equipment will change during the operation process. Taking the machine tool as an example, one of the reasons for this change is the influence of the spindle position change on the dynamic characteristics of the machine tool during operation and the change of the table position. The resulting changes in the dynamic characteristics of the machine tool structure. Another reason is the change of the dynamic characteristics caused by the change of the spindle speed and the change of the table feed speed during operation. In addition to the speed-dependent and position-dependent changes in the dynami...
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IPC IPC(8): G05B19/18G01M7/02
CPCG01M7/02G05B19/18
Inventor 毛新勇彭伊丽李斌秦潮和焕斌荣闹徐宛丛冯勤龙万文杰
Owner HUAZHONG UNIV OF SCI & TECH