Inertial component independent control method used for helicopter main reduction anti-resonance vibration isolation

Abstract

The invention discloses an inertial component independent control method used for helicopter main reduction anti-resonance vibration isolation. The method comprises the following steps of in a finite element model and a solid model of a main reduction vibration isolation system, carrying out simulation measurement to acquire four mass block positions of the main reduction vibration isolation system and a corresponding anti-resonance frequency sample; using a BP neural network method to train the finite element model and a solid model quality block position prediction neural network; taking a minimum of a maximum variation of a single mass block position as a constraint condition, and in the finite element model and the solid model, determining an optimal mass block position by multiple sets of neural networks; using an integrated frequency tracking algorithm and a neural network algorithm to compile a control program for controlling independent motion of a mass block; and according to a measured excitation frequency, driving each mass block to a predicted optimal mass block position by a motor so that the system quickly recovers a vibration isolation effect. In the invention, vibration isolation efficiency can cover all frequencies of a frequency band, and a vibration isolation system can recover the vibration isolation effect quickly when external excitation changes.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction and isolation for helicopters, and relates to an independent control method for inertial elements used for main reduction and anti-resonance vibration isolation of helicopters. Background technique [0002] Dynamic anti-resonance vibration isolation technology is a key technology in the field of helicopter vibration reduction and isolation technology, which has the advantage of high vibration isolation efficiency. It consists of a conventional vibration isolator (consisting of an elastic element and a damping element) plus an inertial element. Focused vibration isolation has a good isolation effect on in-plane loads. It uses the focused elastic method to stabilize the rotor main reduction system on the fuselage. The connecting rods between the fuselage and the main reduction converge on a virtual focus at the top. The lower end is connected to the fuselage by means of elastic devices....

AI Technical Summary

Problems solved by technology

In theory, all mass position configurations can cover all frequencies in the vibration isolation bandwidth, but due to the actual control process, motor accuracy and other reasons, it cannot cover all frequencies in the vibration isolation bandwidth

And when the frequency changes suddenly, the four mass blocks need to move a long distance to reach the designated position at the same time, and the main vibration reduction and isolation system takes a long time to recover the vibration isolation effect, which makes it impossible to quickly reduce the vibration level of the helicopter

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