Fire truck cab local space active noise control system and method

An active noise control, local space technology, applied in active noise control, sounding equipment, instruments, etc., can solve the problem of prominent low-frequency noise in the cab of fire trucks, and achieve the effect of light weight, reasonable space layout, and optimized noise environment

Pending Publication Date: 2021-04-13
西安艾科特声学科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention aims at the prominent problem of low-frequency noise in the cab of the fire truck, and provides a local space active noise control system, which is installed in the cab of the fire truck for noise control to achieve the purpose of reducing noise

Method used

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  • Fire truck cab local space active noise control system and method
  • Fire truck cab local space active noise control system and method
  • Fire truck cab local space active noise control system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] like figure 1 The shown active noise control system in a local space of a fire truck cab includes an active controller, a secondary sound source, an error microphone, a noise reference microphone, a vibration reference sensor, and a control switch. Error microphone, noise reference microphone, vibration reference sensor, control switch, secondary sound source electrical connection; wherein,

[0028] The active controller: includes a digital signal and analog signal conversion module, a system control module, a digital signal processing module, and a power amplification module; preprocesses the input signals picked up by the acoustic microphone and the vibration sensor, such as anti-aliasing filtering, Amplify, etc. to meet the input dynamic range requirements of the circuit and convert it into a digital signal, perform adaptive calculation through the system control algorithm, obtain the controlled secondary signal with the same size and opposite phase as the primary no...

Embodiment 2

[0035] like figure 2 As shown, the number of error microphones is preferably 3, which are error microphone 1 for the passenger position, error microphone 2 for the command position, and error microphone 3 for the main driver position; the number of secondary sound sources is preferably 5, respectively. The secondary sound source 4 in the front, the secondary sound source 5 in the right rear of the co-pilot position, the secondary sound source 6 in the rear of the command position, the secondary sound source 7 in the left rear of the main driving position, and the secondary sound source 8 in front of the main driving position. The number of vibration reference sensors is preferably 2, which are respectively the front engine vibration reference sensor 9 and the vibration reference sensor 13 near the rear engine; the noise reference microphones are preferably 3, which are respectively the cab noise reference microphone 10 and the high-pressure pump room noise reference Microphon...

Embodiment 3

[0037] like image 3 A method for active noise control in the local space of a fire truck cab includes the following methods: first, the primary noise of the cab is picked up by the error microphone, and the noise signal is converted into an electrical signal and sent to the active controller, and the active control The detector selects two noise reference signals and two vibration reference signals of the front and rear engines, and calculates and processes the signals through an adaptive algorithm to obtain secondary noise signals of equal size and opposite phase, which are then amplified by filtering and sent to the secondary sound source. The secondary noise is emitted to achieve the purpose of noise reduction, so that the target measurement area forms a "quiet zone" and optimizes the noise environment of the fire truck cab.

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Abstract

The invention discloses a fire truck cab local space active noise control system and method, and the system comprises an active controller, a secondary sound source, an error microphone, a noise reference microphone, a vibration reference sensor, and a control switch. The active controller is electrically connected with the error microphone, the noise reference microphone, the vibration reference sensor, the control switch and the secondary sound source. In order to improve the noise environment of a fire fighting truck cab, an active noise control system is installed according to the active noise control principle, the system is small in size and light in weight, comfort of passengers is effectively improved while other devices of the cab are not affected, and noise optimization is actually carried out on the fire fighting truck cab in an active noise control mode for the first time; the system is installed near the head area of a passenger, effectively picks up the primary noise of a target control area, and provides an accurate input signal for an adaptive algorithm.

Description

technical field [0001] The invention relates to the technical field of noise control, in particular to an active noise control system and method for a local space of a fire truck cab. Background technique [0002] The main source of noise in the cab of a fire truck is the engine system, and the low-frequency noise is prominent. Long-term exposure to a noisy local space will affect the human nervous system, cardiovascular system, and blood pressure, causing dizziness, chest tightness, abnormal heart rate, and nervous tension. , especially the impact of low-frequency noise is greater, it is undoubtedly a psychological and physical double test for fire truck drivers and commanders, so it is very important to control and optimize the space noise of the fire truck cab to create a more comfortable noise environment It is an important factor for the fire truck driving commander to successfully complete a firefighting actual combat. [0003] At present, there is no relevant noise a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K2210/1282G10K11/1781G10K11/17857G10K11/17881G10K11/17883
Inventor 代海玉昊昕张亚洲张彦峰李荣
Owner 西安艾科特声学科技有限公司
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