Active noise reduction device of integrated cooker

Abstract

The invention relates to an active noise reduction device of an integrated cooker, and belongs to the technical field of noise reduction of integrated cookers. The device comprises a reference sensor which adopts an acoustic sensor or a rotating speed sensor; an actuator which is a secondary sound source for generating a secondary sound field, namely a loudspeaker; a controller which comprises hardware and software, wherein the software takes a self-adaptive active control algorithm as a core, and the hardware provides a physical platform for the software; and error sensors which comprise an actual error sensor and a virtual error sensor which both adopt acoustic sensors. The controller adjusts the sounding intensity of the secondary sound source (loudspeaker) in real time according to the sound pressure signals at the reference sensor, the actual error sensor and the virtual error sensor, and reduces the noise at the ears of a worker in a working area in front of the integrated cooker through destructive interference of the secondary sound source (loudspeaker) and a primary sound source (range hood noise) with frequency sound waves.

Description

technical field [0001] The invention relates to the technical field of noise reduction for integrated cookers, in particular to an active noise reduction device for integrated cookers. Background technique [0002] The integrated stove is a kitchen equipment that integrates multiple kitchen utensils such as range hood, gas stove, disinfection cabinet and oven. Currently, the integrated stoves on the market can be divided into upper exhaust and lower exhaust according to different exhaust methods. type. When the integrated stove is running, the main noise source is the range hood. Reducing the noise of the range hood and improving the sound quality of the integrated stove is an important indicator to improve the market competitiveness of the product. The main sources of noise from range hoods are the airflow noise at the air inlet, the mechanical and electromagnetic noise of the fan, the airflow noise at the exhaust outlet, and the noise radiated from the vibration of variou...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that in the disclosed active noise reduction patent for range hoods, feed-forward control is adopted (that is, only reference sensors are provided without error sensors), and the reference sensors are all acoustic sensors (microphones), and the core components of noise reduction (sensors and speakers) are all Located in the air intake duct of the range hood, it is easily corroded by oil fume, which seriously affects the sensitivity and service life of the device, and increases the resistance of the air intake duct, affecting the effect of oil suction. It has little practical value in the range hood and has not been used in practice at present It is really applied in range hoods

At the same time, the existing published literature considers installing the active noise reduction system in the air inlet duct, which is essentially the application of active noise reduction technology in mature ducts. Since the sound waves in the ducts propagate approximately as average waves, it is easy to achieve active noise reduction. Especially narrowband active noise cancellation

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