Vibration reduction method for longitudinal torsional vibration of vehicle engine

Abstract

The invention relates to a vibration control method based on internal resonance, which is oriented to the longitudinal torsional vibration of an engine, and belongs to the technical field of vibration control of a vehicle engine. The vibration control method comprises the following steps of: establishing a six-degree-of-freedom vibration equation of the engine; constructing a control model of a vibration absorber; establishing a seven-degree-of-freedom vibration equation of the engine with the vibration absorber; decoupling the seven-degree-of-freedom vibration equation, and adjusting the frequency of the vibration absorber to be half of the frequency of a controlled mode; and extracting a controlled mode and vibration absorber mode vibration equation, and solving the controlled mode and vibration absorber mode vibration equation by a multi-scale method. According to the vibration control method disclosed by the invention, through the construction of a nonlinear coupling term, the internal resonance is formed, the vibration energy of the engine is transferred to the vibration absorber, and the vibration energy of the engine is dissipated by the damping of the vibration absorber. The vibration control method disclosed by the invention is obvious in vibration reduction effect, simple in structure and low in energy consumption.

Description

technical field [0001] The invention relates to a vibration control method based on internal resonance. A nonlinear coupling item is constructed between the longitudinal torsional vibration mode of a four-cylinder engine and the vibration absorber mode, and the internal resonance phenomenon unique to nonlinear dynamics is used to convert the engine The vibration energy of the vibration is transferred to the shock absorber and dissipated by the damping of the shock absorber, so as to achieve the vibration reduction of the engine. The invention belongs to the technical field of vibration control of vehicle engines. Background technique [0002] The vehicle's engine is the power source of the car, and it is also the main source of car vibration. Under the action of the inertial force generated by the rotation of the engine crankshaft and the translation of the piston and the impact force generated by gasoline combustion, the engine will generate severe vibration, which will ca...

AI Technical Summary

Problems solved by technology

However, with the continuous development of science and technology, people are more and more aware that linear vibration theory can get satisfactory results when solving many practical engineering problems. In many occasions, such as large-amplitude vibration, linear vibration theory would lead to large errors and even qualitative errors.

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