The Experts below are selected from a list of 1845 Experts worldwide ranked by ideXlab platform
Dale E Chimenti - One of the best experts on this subject based on the ideXlab platform.
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spacecraft Leak Location using structure borne noise
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION VOLUME 29, 2010Co-Authors: Ricky S Reusser, Stephen D Holland, Dale E Chimenti, Ronald A RobertsAbstract:Guided ultrasonic waves, generated by air escaping through a small hole, have been measured with an 8×8 piezoelectric phased‐array detector. Rapid Location of air Leaks in a spacecraft skin, caused by high‐speed collisions with small objects, is essential for astronaut survival. Cross correlation of all 64 elements, one pair at a time, on a diced PZT disc combined with synthetic aperture analysis determines the dominant direction of wave propagation. The Leak Location is triangulated by combining data from two or more detector. To optimize the frequency band selection for the most robust direction finding, noise‐field measurements of a plate with integral stiffeners have been performed using laser Doppler velocimetry. We compare optical and acoustic measurements to analyze the influence of the PZT array detector and its mechanical coupling to the plate.
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SPACECRAFT Leak Location USING STRUCTURE‐BORNE NOISE
2010Co-Authors: Ricky S Reusser, Stephen D Holland, Dale E Chimenti, Ronald A RobertsAbstract:Guided ultrasonic waves, generated by air escaping through a small hole, have been measured with an 8×8 piezoelectric phased‐array detector. Rapid Location of air Leaks in a spacecraft skin, caused by high‐speed collisions with small objects, is essential for astronaut survival. Cross correlation of all 64 elements, one pair at a time, on a diced PZT disc combined with synthetic aperture analysis determines the dominant direction of wave propagation. The Leak Location is triangulated by combining data from two or more detector. To optimize the frequency band selection for the most robust direction finding, noise‐field measurements of a plate with integral stiffeners have been performed using laser Doppler velocimetry. We compare optical and acoustic measurements to analyze the influence of the PZT array detector and its mechanical coupling to the plate.
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Leak Location in spacecraft skin with ultrasonic arrays
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: 34th Annual Review of Progress in Quantitative Nondestructive Evaluation, 2008Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E Chimenti, S SulhoffAbstract:An array‐based Leak Location sensor has been developed and improved for application onboard spacecraft. Introduction of a diced piezoelectric element has permitted the successful utilization of lower frequency bands to perform the Location. With this new device Location across five integral stiffeners has been demonstrated, despite the stiffeners' strong frequency‐dependent scattering. Spatial Fourier transforms of plate wave signals determine Leak Location independent of the effects of dispersive multiple mode signal transport. The performance of the diced‐element array sensor on a 2×2‐m integrally stiffened aluminum plate is demonstrated.
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array based acoustic Leak Location in spacecraft structures
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, 2007Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E ChimentiAbstract:An array‐based Leak Location sensor is being developed for spacecraft application which uses spatial Fourier transformation of plate wave signals to robustly determine Leak Location, independent of the effects of dispersive multiple mode signal transport. The underlying principle of operation is outlined. The performance of a prototype array sensor on structural skin containing integrally machined stiffeners is demonstrated. A significant frequency dependence of transmission efficiency on stiffener geometry is observed, indicating the importance of pass‐band optimization.
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Array‐Based Acoustic Leak Location in Spacecraft Structures
AIP Conference Proceedings, 2007Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E ChimentiAbstract:An array‐based Leak Location sensor is being developed for spacecraft application which uses spatial Fourier transformation of plate wave signals to robustly determine Leak Location, independent of the effects of dispersive multiple mode signal transport. The underlying principle of operation is outlined. The performance of a prototype array sensor on structural skin containing integrally machined stiffeners is demonstrated. A significant frequency dependence of transmission efficiency on stiffener geometry is observed, indicating the importance of pass‐band optimization.
Tao Wang - One of the best experts on this subject based on the ideXlab platform.
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gas Leak Location detection based on data fusion with time difference of arrival and energy decay using an ultrasonic sensor array
Sensors, 2018Co-Authors: Tao Wang, Xiaoran Wang, Mingyu HongAbstract:: Ultrasonic gas Leak Location technology is based on the detection of ultrasonic waves generated by the ejection of pressured gas from Leak holes in sealed containers or pipes. To obtain more accurate Leak Location information and determine the Locations of Leak holes in three-dimensional space, this paper proposes an ultrasonic Leak Location approach based on multi-algorithm data fusion. With the help of a planar ultrasonic sensor array, the eigenvectors of two individual algorithms, i.e., the arrival distance difference, as determined from the time difference of arrival (TDOA) Location algorithm, and the ratio of arrival distances from the energy decay (ED) Location algorithm, are extracted and fused to calculate the three-dimensional coordinates of Leak holes. The fusion is based on an extended Kalman filter, in which the results of the individual algorithms are seen as observation values. The final system state matrix is composed of distances between the measured Leak hole and the sensors. Our experiments show that, under the condition in which the pressure in the measured container is 100 kPa, and the Leak hole⁻sensor distance is 800 mm, the maximum error of the calculated results based on the data fusion Location algorithm is less than 20 mm, and the combined accuracy is better than those of the individual Location algorithms.
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Gas Leak Location method based on annular ultrasonic sensor array
2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2018Co-Authors: Tao Wang, Xiaoran Wang, Bo WangAbstract:In order to resolving the problem of diagnosing gas Leak, this paper presents a method based on annular ultrasonic sensor array targeted at gas Leak Location of cylindrical containers. The Location of gas Leak is based on a data fusion algorithm with acoustic intensity algorithm and time difference of arrival (TDOA). An ultrasonic gas Leak Location system is established by this method. The validity and correctness of this method are verified by experimental results.
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I2MTC - Gas Leak Location method based on annular ultrasonic sensor array
2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2018Co-Authors: Tao Wang, Xiaoran Wang, Bo WangAbstract:In order to resolving the problem of diagnosing gas Leak, this paper presents a method based on annular ultrasonic sensor array targeted at gas Leak Location of cylindrical containers. The Location of gas Leak is based on a data fusion algorithm with acoustic intensity algorithm and time difference of arrival (TDOA). An ultrasonic gas Leak Location system is established by this method. The validity and correctness of this method are verified by experimental results.
Ronald A Roberts - One of the best experts on this subject based on the ideXlab platform.
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spacecraft Leak Location using structure borne noise
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION VOLUME 29, 2010Co-Authors: Ricky S Reusser, Stephen D Holland, Dale E Chimenti, Ronald A RobertsAbstract:Guided ultrasonic waves, generated by air escaping through a small hole, have been measured with an 8×8 piezoelectric phased‐array detector. Rapid Location of air Leaks in a spacecraft skin, caused by high‐speed collisions with small objects, is essential for astronaut survival. Cross correlation of all 64 elements, one pair at a time, on a diced PZT disc combined with synthetic aperture analysis determines the dominant direction of wave propagation. The Leak Location is triangulated by combining data from two or more detector. To optimize the frequency band selection for the most robust direction finding, noise‐field measurements of a plate with integral stiffeners have been performed using laser Doppler velocimetry. We compare optical and acoustic measurements to analyze the influence of the PZT array detector and its mechanical coupling to the plate.
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SPACECRAFT Leak Location USING STRUCTURE‐BORNE NOISE
2010Co-Authors: Ricky S Reusser, Stephen D Holland, Dale E Chimenti, Ronald A RobertsAbstract:Guided ultrasonic waves, generated by air escaping through a small hole, have been measured with an 8×8 piezoelectric phased‐array detector. Rapid Location of air Leaks in a spacecraft skin, caused by high‐speed collisions with small objects, is essential for astronaut survival. Cross correlation of all 64 elements, one pair at a time, on a diced PZT disc combined with synthetic aperture analysis determines the dominant direction of wave propagation. The Leak Location is triangulated by combining data from two or more detector. To optimize the frequency band selection for the most robust direction finding, noise‐field measurements of a plate with integral stiffeners have been performed using laser Doppler velocimetry. We compare optical and acoustic measurements to analyze the influence of the PZT array detector and its mechanical coupling to the plate.
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Leak Location in spacecraft skin with ultrasonic arrays
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: 34th Annual Review of Progress in Quantitative Nondestructive Evaluation, 2008Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E Chimenti, S SulhoffAbstract:An array‐based Leak Location sensor has been developed and improved for application onboard spacecraft. Introduction of a diced piezoelectric element has permitted the successful utilization of lower frequency bands to perform the Location. With this new device Location across five integral stiffeners has been demonstrated, despite the stiffeners' strong frequency‐dependent scattering. Spatial Fourier transforms of plate wave signals determine Leak Location independent of the effects of dispersive multiple mode signal transport. The performance of the diced‐element array sensor on a 2×2‐m integrally stiffened aluminum plate is demonstrated.
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array based acoustic Leak Location in spacecraft structures
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, 2007Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E ChimentiAbstract:An array‐based Leak Location sensor is being developed for spacecraft application which uses spatial Fourier transformation of plate wave signals to robustly determine Leak Location, independent of the effects of dispersive multiple mode signal transport. The underlying principle of operation is outlined. The performance of a prototype array sensor on structural skin containing integrally machined stiffeners is demonstrated. A significant frequency dependence of transmission efficiency on stiffener geometry is observed, indicating the importance of pass‐band optimization.
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Array‐Based Acoustic Leak Location in Spacecraft Structures
AIP Conference Proceedings, 2007Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E ChimentiAbstract:An array‐based Leak Location sensor is being developed for spacecraft application which uses spatial Fourier transformation of plate wave signals to robustly determine Leak Location, independent of the effects of dispersive multiple mode signal transport. The underlying principle of operation is outlined. The performance of a prototype array sensor on structural skin containing integrally machined stiffeners is demonstrated. A significant frequency dependence of transmission efficiency on stiffener geometry is observed, indicating the importance of pass‐band optimization.
Stephen D Holland - One of the best experts on this subject based on the ideXlab platform.
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spacecraft Leak Location using structure borne noise
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION VOLUME 29, 2010Co-Authors: Ricky S Reusser, Stephen D Holland, Dale E Chimenti, Ronald A RobertsAbstract:Guided ultrasonic waves, generated by air escaping through a small hole, have been measured with an 8×8 piezoelectric phased‐array detector. Rapid Location of air Leaks in a spacecraft skin, caused by high‐speed collisions with small objects, is essential for astronaut survival. Cross correlation of all 64 elements, one pair at a time, on a diced PZT disc combined with synthetic aperture analysis determines the dominant direction of wave propagation. The Leak Location is triangulated by combining data from two or more detector. To optimize the frequency band selection for the most robust direction finding, noise‐field measurements of a plate with integral stiffeners have been performed using laser Doppler velocimetry. We compare optical and acoustic measurements to analyze the influence of the PZT array detector and its mechanical coupling to the plate.
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SPACECRAFT Leak Location USING STRUCTURE‐BORNE NOISE
2010Co-Authors: Ricky S Reusser, Stephen D Holland, Dale E Chimenti, Ronald A RobertsAbstract:Guided ultrasonic waves, generated by air escaping through a small hole, have been measured with an 8×8 piezoelectric phased‐array detector. Rapid Location of air Leaks in a spacecraft skin, caused by high‐speed collisions with small objects, is essential for astronaut survival. Cross correlation of all 64 elements, one pair at a time, on a diced PZT disc combined with synthetic aperture analysis determines the dominant direction of wave propagation. The Leak Location is triangulated by combining data from two or more detector. To optimize the frequency band selection for the most robust direction finding, noise‐field measurements of a plate with integral stiffeners have been performed using laser Doppler velocimetry. We compare optical and acoustic measurements to analyze the influence of the PZT array detector and its mechanical coupling to the plate.
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Leak Location in spacecraft skin with ultrasonic arrays
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: 34th Annual Review of Progress in Quantitative Nondestructive Evaluation, 2008Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E Chimenti, S SulhoffAbstract:An array‐based Leak Location sensor has been developed and improved for application onboard spacecraft. Introduction of a diced piezoelectric element has permitted the successful utilization of lower frequency bands to perform the Location. With this new device Location across five integral stiffeners has been demonstrated, despite the stiffeners' strong frequency‐dependent scattering. Spatial Fourier transforms of plate wave signals determine Leak Location independent of the effects of dispersive multiple mode signal transport. The performance of the diced‐element array sensor on a 2×2‐m integrally stiffened aluminum plate is demonstrated.
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array based acoustic Leak Location in spacecraft structures
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, 2007Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E ChimentiAbstract:An array‐based Leak Location sensor is being developed for spacecraft application which uses spatial Fourier transformation of plate wave signals to robustly determine Leak Location, independent of the effects of dispersive multiple mode signal transport. The underlying principle of operation is outlined. The performance of a prototype array sensor on structural skin containing integrally machined stiffeners is demonstrated. A significant frequency dependence of transmission efficiency on stiffener geometry is observed, indicating the importance of pass‐band optimization.
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Array‐Based Acoustic Leak Location in Spacecraft Structures
AIP Conference Proceedings, 2007Co-Authors: Ricky S Reusser, Stephen D Holland, Ronald A Roberts, Dale E ChimentiAbstract:An array‐based Leak Location sensor is being developed for spacecraft application which uses spatial Fourier transformation of plate wave signals to robustly determine Leak Location, independent of the effects of dispersive multiple mode signal transport. The underlying principle of operation is outlined. The performance of a prototype array sensor on structural skin containing integrally machined stiffeners is demonstrated. A significant frequency dependence of transmission efficiency on stiffener geometry is observed, indicating the importance of pass‐band optimization.
Mingyu Hong - One of the best experts on this subject based on the ideXlab platform.
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gas Leak Location detection based on data fusion with time difference of arrival and energy decay using an ultrasonic sensor array
Sensors, 2018Co-Authors: Tao Wang, Xiaoran Wang, Mingyu HongAbstract:: Ultrasonic gas Leak Location technology is based on the detection of ultrasonic waves generated by the ejection of pressured gas from Leak holes in sealed containers or pipes. To obtain more accurate Leak Location information and determine the Locations of Leak holes in three-dimensional space, this paper proposes an ultrasonic Leak Location approach based on multi-algorithm data fusion. With the help of a planar ultrasonic sensor array, the eigenvectors of two individual algorithms, i.e., the arrival distance difference, as determined from the time difference of arrival (TDOA) Location algorithm, and the ratio of arrival distances from the energy decay (ED) Location algorithm, are extracted and fused to calculate the three-dimensional coordinates of Leak holes. The fusion is based on an extended Kalman filter, in which the results of the individual algorithms are seen as observation values. The final system state matrix is composed of distances between the measured Leak hole and the sensors. Our experiments show that, under the condition in which the pressure in the measured container is 100 kPa, and the Leak hole⁻sensor distance is 800 mm, the maximum error of the calculated results based on the data fusion Location algorithm is less than 20 mm, and the combined accuracy is better than those of the individual Location algorithms.