Excavator cab structure sound and air sound hybrid active control system and control method

Abstract

The invention provides an excavator cab structure sound and air sound hybrid active control system and a control method thereof. The excavator cab structure sound and air sound hybrid active control system comprises a power amplifier, a loudspeaker, an actuator and a controller, the controller is also connected with the vibration sensor through a FIR low-pass filter, and a sound pressure sensor is also connected with the controller; the vibration sensor, the actuator and a loudspeaker are arranged on a cab of the excavator, and the sound pressure sensor is arranged in the cab of the excavator. The system has the advantages of being easy to implement, good in stability, good in active noise control effect, low in cost and the like.

Description

technical field [0001] The invention relates to the field of active noise control, in particular to an active control system and a control method for mixing structural sound and air sound in an excavator cab. Background technique [0002] With the further acceleration of the urbanization process, the demand for construction machinery such as excavators is also increasing. At the same time, the concept of sustainable development of environmental protection is deeply rooted in the hearts of the people. People no longer only pay attention to the performance of excavators, but the NVH performance of excavators put forward higher requirements. When the excavator is working, the engine vibrates greatly, and the vibration is transmitted to the frame through the engine mount, and then transmitted to the cab. There are many thin-plate structures in the excavator cab, which are prone to vibration under external excitation, thereby radiating low-frequency structure-borne noise. In ad...

AI Technical Summary

Problems solved by technology

For structural sound, optimizing engine vibration, engine mounts and frame can reduce the vibration transmitted to the driving panel to a certain extent, only need to re-match the engine mount and design frame, so the optimization cycle is long and the cost is high

In addition, even if the vibration transmitted to the cab is reduced, the peak frequency of engine vibration is related to the ignition order and engine speed. During the operation of the engine, the vibration peak frequency of the main order is easy to approach the resonance frequency of the cab panel, causing Vibration of cab panels, radiating low-frequency structure-borne sound

For the air sound, it can be improved by strengthening the sealing of the cab and designing the acoustic package for the cab. Low frequency noise effect is not obvious

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