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Virtual sensing technology-based active noise control system and method for train cab

A technology of active noise control and virtual sensing, applied in active noise control, sound-generating devices, instruments, etc., can solve the problems of limited layout of electro-acoustic devices, influence of normal driver's activities, high noise reduction, etc.

Pending Publication Date: 2020-12-18
西安艾科特声学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the application of this technology, only by placing the error microphone at the driver's ear can the best control of the driver's head area be ensured, but this will definitely have a serious impact on the driver's normal activities
All in all, the position with the best noise reduction effect of the existing active noise control technology is not the desired position. To maximize the noise reduction at the desired position, the layout of electro-acoustic devices is severely limited, and it is impossible to ensure that the driver's head is not affected without affecting normal activities. Area noise reduction works best

Method used

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  • Virtual sensing technology-based active noise control system and method for train cab
  • Virtual sensing technology-based active noise control system and method for train cab
  • Virtual sensing technology-based active noise control system and method for train cab

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The main purpose of the active noise control method based on virtual sensing technology is to generate an active quiet zone in the driver's head area without affecting the normal activities of the driver, that is, the quiet zone of the active noise control system is changed from the position of the error microphone Move to the driver's ear position. This technology is an active noise control system designed based on the principle of forming an active silent zone in local active noise control. It can also be used when it is inconvenient or impossible to place an error microphone close to the human ear. An effective silent zone is formed near the human ear, and the control system can still maintain good stability and noise reduction performance when the human head moves or the noise environment changes. In this system, the restriction on the installation position of the error microphone is obviously reduced, so the research on this system has high practical value and very...

Embodiment 2

[0097] Such as Image 6 As shown, the actual application of the system is divided into the following two steps:

[0098] 1. Modeling and debugging stage

[0099] For this system, the physical primary path P p It is only used for system principle illustration, not for actual modeling. Physical secondary pathway H p , virtual secondary path H vand the physical virtual channel H pv Both require actual modeling to obtain their estimated values with Pathway modeling is divided into the following two steps:

[0100] a. Secondary pathway modeling

[0101] Secondary pathway modeling includes physical secondary pathways and virtual secondary pathways. The modeling method is that the secondary sound source plays the "preset sound source" in sequence, the microphones at the physical error point and the virtual error point receive the signal at the same time, and complete the transmission from the secondary sound source to the physical error point and the virtual error point th...

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Abstract

The invention discloses a virtual sensing technology-based active noise control system and method for a train cab. The system comprises a secondary sound source, error microphones and an active noisecontroller; the secondary sound source is used for generating a secondary sound field and superposing the secondary sound field with a primary sound field to achieve the purpose of reducing noise; andthe error microphones include a physical error microphone and a virtual error microphone. The method comprises modeling debugging and noise control. According to the invention, a virtual sensing technology is used for active noise control of the locomotive cab, and it is guaranteed that the control effect of a head area of a driver is optimal while normal activity of the driver is not affected; and the limitation on the installation position of the error microphones is obviously reduced, so that the practical value is relatively high and the practical significance is very important. A transfer function from a physical error point to a virtual error point, namely a modeling method of a physical virtual path Hpv and specific steps, are clearly proposed; The technology is suitable for personnel working at fixed points in a noisy environment for a long time.

Description

technical field [0001] The invention relates to the technical field of noise control, more specifically to an active noise control system and method for a train cab based on virtual sensing technology. Background technique [0002] During the running of the train, the track noise generated by the wheel-rail area and the vibration noise generated by the engine and its auxiliary equipment will be transmitted to the interior of the carriage through structure transmission and air transmission, which will have a certain impact on the physical and mental health of the driver and the accuracy of operation. , various noise control technologies came into being. [0003] For the train noise whose energy is mainly concentrated in the low-frequency band, active noise control technology is currently used to reduce noise. It is not the driver's head area that has the highest noise reduction. During the application of this technology, only by placing the error microphone at the driver's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K11/178G10K11/17817G10K11/17823G10K11/17825G10K2210/1283
Inventor 代海李荣玉昊昕宁晓峰张彦峰李鹏涛刘玲
Owner 西安艾科特声学科技有限公司
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