A Supercritical Shafting Vibration Damping Device Based on Nonlinear Analog Circuit

Abstract

The invention discloses a supercritical shafting vibration damping device based on a nonlinear analog circuit. Compared with the traditional passive piezoelectric control circuit and the active control method with complex system and high power consumption only for specific vibration suppression frequency, by adopting The vibration control circuit with nonlinear voltage-current relationship vibrates with the multi-order frequency of the shaft and dissipates energy, thereby effectively increasing the bandwidth of vibration suppression, and can achieve good control effects on the vibration response and instability vibration response at different critical speeds of the shaft system ; With smaller inductance and resistance to dissipate the vibration energy of the shaft system, it is easier to achieve efficient energy dissipation in a wider frequency range, and enhance the robustness of the shaft system to the random and time-varying characteristics of the system structure, which can be used for Realize effective suppression of nonlinear vibration response of supercritical shafting.

Description

technical field [0001] The invention belongs to the technical field of vibration suppression of high-speed rotating machinery, and in particular relates to a supercritical shafting vibration damping device based on a nonlinear analog circuit. Background technique [0002] The rotors of large rotating machinery such as helicopter tail drive systems and ship gas turbines mostly adopt supercritical shafting design. On the one hand, it can meet the growing requirements of high performance, long life and high reliability of rotating machinery. Lighter and more span. However, this type of rotor has to cross one or more critical bending speeds before reaching the maximum operating speed. When passing the critical speed, the shafting works in a flexible shaft state, and the bending deformation is obvious, which brings a series of rotor dynamics. Learning problems, especially instability failures, occur from time to time. Therefore, it is necessary to take corresponding vibration r...

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Problems solved by technology

The series resistance-inductance circuit is essentially a dynamic vibration absorption technology, which is mostly suitable for narrow frequency bands; the synchronous switch circuit realizes energy dissipation to control vibration by controlling the opening and closing of the circuit, and can realize broadband multi-mode control, but this technology requires additional Vibration monitoring and switch controller, the control system is complicated; the negative capacitance circuit can be used to enhance the broadband suppression effect by constructing negative capacitance reactance to offset the parasitic capacitance of the piezoelectric sheet, but when the negative capacitance value is close to or smaller than the parasitic capacitance value of the piezoelectric sheet, system will be unstable

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