Noise and vibration sensing

A technology for sensing signals and noise control, applied in the direction of sounding equipment, active noise control, musical instruments, etc.

Active Publication Date: 2018-06-08
HARMAN BECKER AUTOMOTIVE SYST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, active sound technologies for road noise cancellation may require very specific noise and vibration (N&V) sensor arrangements throughout the vehicle structure to observe noise and vibration signatures associated with road noise

Method used

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Embodiment Construction

[0013] Noise and vibration sensors provide reference inputs to active road noise control (RNC) systems (eg, multi-channel feed-forward active RNC systems) as the basis for generating noise immunity that reduces or eliminates road noise. Noise and vibration sensors may include acceleration sensors such as accelerometers, force gauges, load cells, and the like. For example, an accelerometer is a device that measures intrinsic acceleration. Intrinsic acceleration and coordinate acceleration do not refer to the same concept, and coordinate acceleration is the rate of change of velocity. Both single-axis and multi-axis models of accelerometers are available to detect the magnitude and direction of natural acceleration and can be used to sense orientation, coordinate acceleration, motion, vibration and shock.

[0014] Airborne and structure-borne noise sources are monitored by noise and vibration sensors to provide the highest possible road noise reduction (cancellation) performanc...

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Abstract

An example active road noise control includes generating with a sensor arrangement a primary sense signal representative of at least one of accelerations, motions and vibrations that occur at a firstposition, and providing a noise reducing signal by processing the primary sense signal according to an adaptive mode of operation or a non-adaptive mode of operation. It further includes generating within the vehicle body noise reducing sound at the second position from the noise reducing signal, evaluating the primary sense signal and controlling the processing of the primary sense signal so thatthe primary sense signal is processed in the adaptive mode of operation when the magnitude of the primary sense signal undercuts a first threshold and in the non-adaptive mode of operation when the magnitude of the primary sense signal exceeds a second threshold, the first threshold being equal to or smaller than the second threshold.

Description

technical field [0001] The present disclosure relates to active road noise control systems and noise and vibration measurement methods. Background technique [0002] Land vehicles traveling on roads and other surfaces produce low-frequency noise known as road noise. Even in modern vehicles, occupants may be exposed to structurally transmitted (e.g., tire-suspension-body-interior paths, and through airborne paths, e.g., tire-body-interior paths) to the vehicle of road noise. It is desirable to reduce the road noise experienced by the occupants of the vehicle. Active noise, vibration, and harshness (NVH) control technologies, also known as active road noise control (RNC) systems, can be used to reduce these noise components without changing the vehicle structure as in active vibration technologies. However, active sound technologies for road noise cancellation may require very specific noise and vibration (N&V) sensor arrangements throughout the vehicle structure to observe...

Claims

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Application Information

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IPC IPC(8): G10K11/178
CPCG10K2210/12821G10K2210/129G10K2210/30391G10K2210/3045G10K2210/3046G10K11/17823G10K11/17879G10K11/17835G10K11/17883G10K11/17854
Inventor G.普法芬格
Owner HARMAN BECKER AUTOMOTIVE SYST
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