A Method for Delaying Rotor Crack Growth by Electromagnetic Actuator
A technology for electromagnetic actuators and rotor cracks, which is used in electrical program control, program control in sequence/logic controllers, etc., to ensure safe and stable operation and good control.
Inactive Publication Date: 2016-06-08
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
Existing methods of retarding crack growth are only by changing the composition of materials, such as adding special elements, changing the composition ratio of materials, etc., or changing the mechanical structure of the system and other passive delay methods.
Method used
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Embodiment
[0019] In the present invention, the experimental device of the method of delaying the crack growth of the rotor through the electromagnetic actuator is as follows: figure 1 , 2 shown.
[0020] The nonlinear cracked rotor system experimental device is composed of a test bench, a signal acquisition device, a signal processing device, and a signal execution device. Disc 7, test disc 8, test magnetic film 9 and double-row self-aligning ball bearings 10 are arranged horizontally and linearly, and the elastic rotating shaft 4 of the test piece with crack 5 is fixed by the fixed disc 7 and passed through the single-row deep groove ball shaft 3 and double-row self-aligning ball bearings 10 support, the fixed disc 7 has a diameter of 150 mm and a thickness of 12 mm, and the belt-type motor transmission device 18 drives the elastic shaft 4 to rotate through the flexible coupling 2 and periodically presents cracks 5 to open and close state, the test disc 8 and the test magnetic film 9...
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The invention provides a method for delaying the crack growth of a rotor through an electromagnetic actuator. The method includes the steps that in the running process of the non-linear cracked rotor, a position detection device of a control system collects vibration portion signals of the non-linear cracked rotor in real time and transmits the vibration portion signals to a signal amplifier for amplification processing, analog signals subjected to amplification processing are converted to digital signals, and then the digital signals are transmitted to a computer in the control system; the computer calculates control parameters of the electromagnetic actuator according to the vibration portion signals of the rotor; the control system converts digital signals of the control parameters into analog signals and transmits the analog signals to a current source control amplifier, and generated current control signals are transmitted to the electromagnetic actuator to generate corresponding electromagnetic force, so that vibration of a cracked rotor system is controlled not to exceed a preset stable operating threshold, and the non-linear cracked rotor is kept to be in a closed state at any time. According to the method, the vibration of the non-linear cracked rotor can be controlled through the electromagnetic actuator, and at the same time, crack expansion of the non-linear rotor can be effectively delayed.
Description
technical field [0001] The invention relates to a method for delaying the crack growth of a rotary machine rotor, in particular to a method for slowing down the crack growth of the rotor through an electromagnetic actuator. Background technique [0002] In the operation of rotating machinery, due to the existence of defects or microcracks in the rotor material, and the rotor usually works in the harsh environment of multi-coupling fields (high temperature, high pressure, high load) and periodic alternating loads, accompanied by high-speed rotation , so the nonlinear rotor system is easy to induce crack initiation and propagation, and the failure caused by this problem is extremely dangerous for the entire mechanical system. Many scholars at home and abroad have studied the vibration characteristics of cracked rotors, looking for online diagnosis methods for rotor cracks. By monitoring the operation status of rotating machinery, cracks can be found early and the expansion of...
Claims
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IPC IPC(8): G05B19/04
Inventor 刘军王亮富
Owner TIANJIN UNIVERSITY OF TECHNOLOGY