On-line identification method for dynamic torsional stiffness of elastic coupling unit
A technology of elastic coupling and torsional stiffness, which is applied in the direction of elastic testing, instrumentation, machine/structural component testing, etc., and can solve the problems of lack of installation angle markers, limitations of engineering promotion, limited engineering promotion, etc. problems, to avoid excessive correction and excessive cycle iteration, extensive engineering promotion value, and easy implementation
Active Publication Date: 2017-10-03
HARBIN ENG UNIV
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A typical method is that Professor Li Wanyou of Harbin Engineering University invented a method for synchronous measurement of the dynamic and static torsional stiffness of the elastic coupling in the working state. Although this method can realize the synchronization of the dynamic and static torsional stiffness of the elastic coupling in the dynamic state However, since this method needs to install an angle marker at both ends of the power plant, the engineering generalization of this method is limited (Li Wanyou, Lu Xiqun, Zhang Tianyuan, Du Jingtao, Lu Binglin, Guo Yibin. Working status Synchronous measurement method of dynamic and static torsional stiffness of elastic coupling [P]. Chinese patent: 101718612, 2010-06-02.)
The main reason for the limited engineering promotion of this method is that the installation of the angle marker requires the design of a special installation and fixing mechanism, and the installation of the angle marker requires a suitable installation position for the power unit, but the shafting of the ship power unit is not Have the conditions to install the angle marker on the power receiver (propeller)
[0005] In summary, at present, the measurement and identification of the dynamic torsional stiffness of elastic couplings is mainly completed on a specific elastic coupling dynamic test bench, but due to the limitation of experimental conditions, this method is difficult to be widely used in practical engineering
On the other hand, the current typical online identification method of dynamic torsional stiffness of elastic coupling has certain limitations in engineering promotion due to the installation conditions of the angle marker
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[0035] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0036] combine figure 1 , figure 2 and image 3 As shown, the present invention is applied to the shafting of the power plant with the diesel engine as the prime mover and the propeller as the power receiver, and the identification of the dynamic torsional stiffness of the elastic coupling under the working state is carried out. The specific process is as follows:
[0037]Step 1: Install the magnetic sensor radially on the flywheel chainring of the diesel engine, and the sensor probe is facing the tooth top and pointing to the center of the flywheel. In the working speed range of the diesel engine, the torsional vibration signal of the shafting system can be collected through the method of speed up and down, and the torsional vibration signal of the shafting system can also be collected through the steady state test method. The amplitude-frequency characterist...
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The invention relates to an on-line identification method for dynamic torsional stiffness of an elastic coupling unit. The method comprises: a torsion vibration signal of a shafting of a diesel engine is collected and an inherent frequency experiment value of torsion vibration of the shafting is obtained; on the basis of a model, calculation is carried out to obtain an inherent frequency calculation value of the torsion vibration of the shafting; a relative error between the inherent frequency calculation value of the torsion vibration of the shafting and the inherent frequency experiment value and a 2- norm of the relative error are calculated and a torsional stiffness correction function of an elastic coupling unit is constructed; a 2- norm of a relative error in a current iterative loop step and a 2- norm of a relative error in a previous iterative loop step are compared and the 2- norm of the relative error in the current iterative loop step is compared with a preset error limit, torsional stiffness correction of the elastic coupling unit is carried out, and a dynamic torsional stiffness value of the elastic coupling unit is outputted to realize on-line identification of the dynamic torsional stiffness value of the elastic coupling unit. Therefore, on-line identification can be carried out when the elastic coupling unit is not dismounted; the method can be carried out rapidly and precisely; the operation becomes simple and conveniently; the method is easy to implement; and no special experiment test stand is needed.
Description
technical field [0001] The invention belongs to the field of vibration engineering, and in particular relates to an online identification method for dynamic torsional stiffness of an elastic coupling, in particular to an online identification method for dynamic torsional stiffness of an elastic coupling based on the measurement and correction of the natural frequency of torsional vibration of a shaft system. Background technique [0002] Elastic couplings are key components in power transmission of machinery and equipment. They have the functions of vibration reduction, noise reduction and buffering, and are widely used in industries such as ships, electric power and locomotives. The torsional stiffness of an elastic coupling is its main dynamic parameter and also a key parameter affecting the vibration of the power plant shafting. At present, elastic couplings are only marked with static torsional stiffness when they leave the factory, and the ratio of dynamic torsional sti...
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Login to View More IPC IPC(8): G01M5/00
CPCG01M5/0066
Inventor 李玩幽袁运博郭宜斌率志君刘冲培高奇刘震
Owner HARBIN ENG UNIV