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Acoustic Holography
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Traditional NVH approaches measure signals through multi-channel inputs and outputs and analyze them using filtering, modulation, convolution, and correlation to gain insight into the problem. Alternatively, NVH analysis has used intensity scans to map sources. While these approaches have been the best methods available to date, they are usually time consuming and measurement position dependent. Moreover, results are valid at the measurement points only and sources can be missed or misdiagnosed. Planar acoustic holography took a step in the right direction but suffers from:
□ Constraints in microphone spacing and positioning,
□ Multiple set-ups when broad frequency ranges are of interest, and
□ The inability to account for reflections
□ and the limits of plane-to-plane reconstructions (3D surfaces cannot be reconstructed)
The SenSound HELS-based approach is different. SenSound accurately reconstructs the entire 3D acoustic field around a source object, or in an interior, in order to visualize pressure, intensity and velocity. This comprehensive approach allows SenSound to:
□ Pinpoint sources and transmission paths,
□ Identify normal surface vibration response in order to extract the vibration modes that are responsible for sound radiation,
□ Distinguish between structure borne and airborne noise,
□ And identify the contribution of different sources relative to a given location.
SenSound’s results are valid in the entire 3D space and on a 3D surface, and are much less measurement-position dependent.
SenSound’s core diagnostic software platform, known as SenAHTM, utilizes patented nearfield acoustical holography techniques to allow users to “see” or visualize sound as it travels through space and time. It is used by engineers in product development and troubleshooting to quickly identify and diagnose product noise sources and create mitigation strategies for complex noise issues.
SenSound provides SenAH based turnkey integrated hardware/software noise diagnostic test systems solutions to customers by partnering with a variety of leading edge data acquisition hardware vendors. SenAH systems utilize large custom arrays of microphones that are tailored to the customer’s specific needs.
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SenCAHTM provides a very easy to use and cost effective approach to acoustic holography. It utilizes a microphone array connected to a digitizing arm to simultaneously measure microphone location and acoustic pressure signals. This combination of digitizer and microphone array allows for multiple measurements to be taken rapidly, decreasing the time required to test an object and reducing the cost, size and complexity of the measurement system. The same arm is used to digitize the surface of the object being measured. The SenCAH system is USB based allowing for plug and play connection to PCs and note book computers for real-time acquisition and display of sound pressure levels and microphone coordinates. The picture to the left shows a vacuum cleaner being measured.
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SenPADTM utilizes a single or dual layered microphone array to simultaneously measure acoustic pressure signals and calculate in real time particle velocity or acoustic intensity on the measurement plane. The dual layer array is able to distinguish between income and outgoing acoustic intensity, an important consideration when there are potential noise sources in the field behind the paddle or the measurement is taking place inside an enclosed space such as a cabin interior. The fixed paddle array decreases the time required to test an object and reduces the cost, size and complexity of the measurement system.
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SenSound’s NDT and MCM software platform, known as SenQCTM, allows users to conduct quality control testing in the presence of factory noise without the need of special quiet rooms. This cost effective quality control approach allows the identification of defects not identifiable by other means, and the effective monitoring of machinery. SenSound provides SenQC based customized hardware and software manufacturing test systems to customers by partnering with a variety of leading edge data acquisition hardware vendors, and also provides software toolkits to system integrators for inclusion in their own test stand systems.
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