Component modal parameter measurement system and method for spacecraft electromechanical product
A technology of electromechanical products and modal parameters, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc. Measuring the Effects of Costs Statically
Active Publication Date: 2020-11-03
BEIJING INST OF CONTROL ENG
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Problems solved by technology
Currently available vibration sensors are generally piezoelectric or charge-type, with a weight of more than 10 grams. The mass of the sensor itself will change the structure of the tested part and have a great impact on the test accuracy.
In addition, this type of high-precision vibration sensor requires an external charge amplifier and high-speed data collector, which is extremely expensive and complex to implement.
Method used
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Embodiment
[0057] Taking the CMG rotor as an example, first determine the nodes and maximum points of the rotor mode shape through Ansys pre-analysis; paste the vibration detection module on the figure 1 The bearing support point 1, the bearing support point 2 and the nodes and maximum points of the rotor mode shape are shown. Suspend and fix the rotor with cotton thread (or soft thin thread). One end of the fixed point is the node of the rotor mode shape, and the other end is the suspension point.
[0058] Hit the end of the CMG rotor (at the point of the maximum mode shape) with a modal hammer, the vibration detection module at bearing support point 1 outputs U1(t), and the vibration detection modules at other pasting points output U2(t), U3(t ) and U4(t). Send U1(t), U2(t), U3(t) and U4(t) to the signal processing module at the same time. Take the voltage signal U1(t) output by the vibration detection module pasted at bearing support point 1 as the reference signal to connect to osc...
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The invention relates to a component modal parameter measurement system and method for spacecraft electromechanical product, the component is a high-speed rotor of a gyro, a high-speed rotor of a control moment gyro or a rotor of a flywheel, the modal parameters comprise frequency, vibration mode and damping, and the system and the invention belong to the technical field of small-mass mechanical component modal measurement. The MEMS accelerometer is used for modal measurement of a small-mass assembly such as a gyro high-speed rotor, the influence of the weight of the sensor on the mass distribution of the measured rotor is reduced, and the modal measurement precision of the rotor is improved. An oscilloscope is used for replacing a front-end processor and analysis software of a traditionalaccelerometer, modal frequency, modal shape and modal damping are obtained through simple operation, and modal measurement cost is greatly reduced. The system and method can be applied to accurate measurement of modal parameters of components such as rotors of products such as control moment gyroscopes, flywheels, two-floated gyroscopes and three-floated gyroscopes. The system and method can alsobe applied to modal measurement of the high-speed motor rotor and has a wide market prospect.
Description
technical field [0001] The invention relates to a system and method for measuring component modal parameters of aerospace electromechanical products. The component is a high-speed rotor of a gyroscope, a high-speed rotor of a control moment gyroscope or a rotor of a flywheel. The modal parameters include frequency, mode shape and damping, and belong to small The technical field of modal measurement of quality mechanical components. Background technique [0002] High-speed rotors are the core components of spacecraft inertial actuators, three-float gyroscopes, and two-float gyroscopes. Its modal design affects the stability and operation accuracy of the whole machine, and the measurement of modal characteristics (frequency, mode shape and damping) is an important means to verify the accuracy of modal design and carry out design iterations. [0003] The structural mode of the rotor is an important design element, and the component modal analysis is one of the foundations and ...
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IPC IPC(8): G01H17/00
CPCG01H17/00Y02T90/00
Inventor 田利梅王英广鲁明胡跃伟张激扬李刚卿涛赵维珩宿诺薛冰杨泽琨
Owner BEIJING INST OF CONTROL ENG