The Experts below are selected from a list of 110958 Experts worldwide ranked by ideXlab platform
S. Gade - One of the best experts on this subject based on the ideXlab platform.
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Application of Operational Modal Analysis on cars
SAE transactions, 2003Co-Authors: N. Moller, S. GadeAbstract:Operational Modal Analysis, also known as Output Only Modal Analysis or Ambient Modal Analysis, has for over a decade been used for extracting Modal parameters from civil engineering structures and is now also being used for mechanical structures, such as on-road and inflight testing. The advantage of this method is that no artificial excitation needs to be applied to the structure and if artificial loading is required, the force does not need to be measured. All parameter estimation is based on the response signals, thereby minimising the amount of work required for test preparation. As the loading force is unknown in Operational Modal Analysis, specially designed Modal parameter estimation techniques need to be used. In classical Modal Analysis many validation tools are based upon the known force, but if this is not known, other validation tools must be implemented. In addition, different estimation techniques are used, so that results can be compared. Figure 1 Test Object. Passenger Car in the Bruel & Kjaer Laboratory Two classes of identifiers will be described in this paper. A frequency domain based method (Frequency Domain Decomposition) and a time domain based (Stochastic Subspace Identification). Results from both methods will be discussed and compared. The paper discusses in general the use of Operational Modal Analysis on cars. Results are shown on a fully assembled car. For further background of the technique please refer to ref. [1] and ref [2].
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Operational Modal Analysis on an exhaust system
2002Co-Authors: N. Moller, S. GadeAbstract:Operational Modal Analysis also known as Ambient Modal Analysis has an increasing interest in mechanical engineering. Especially on structures where the excitation and not less important the determination ofthe forces constitutes a problem. In this paper Modal Analysis is made on the exhaust system of a passenger car. For estimation of the Modal parameters two scenarios were used: Estimation using only the responses when excited by the engine during operation and classical input output Modal Analysis. The results from the two different methods are compared. When using the response measurements only to estimate the Modal parameters different types of dedicated estimators for Operational Modal Analysis are used and compared.
Damien Verhelst - One of the best experts on this subject based on the ideXlab platform.
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output only Modal Analysis using blind source separation techniques
Mechanical Systems and Signal Processing, 2007Co-Authors: Fabien Poncelet, Gaetan Kerschen, Jeanclaude Golinval, Damien VerhelstAbstract:The present study carries out output-only Modal Analysis using two blind source separation (BSS) techniques, namely independent component Analysis and second-order blind identification. The concept of virtual source is exploited and renders the application of these BSS techniques possible. The proposed Modal Analysis method is illustrated using numerical and experimental examples.
Thomas D. Rossing - One of the best experts on this subject based on the ideXlab platform.
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Some optical methods for Modal Analysis of musical instruments.
Journal of the Acoustical Society of America, 2011Co-Authors: Thomas D. RossingAbstract:Because of their high spatial resolution, optical methods have become important for Modal Analysis of vibrations in musical instruments. Among optical methods for Modal Analysis are time‐average holographic interferometry, pulsed TV holography, disital speckle interferometry, and scanning vibrometry. We review briefly principles and applications of optical methods for Modal Analysis.
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Modal Analysis of musical instruments.
Journal of the Acoustical Society of America, 2008Co-Authors: Thomas D. RossingAbstract:The complex vibrations of musical instruments can be described in terms of normal modes of vibration. Modal Analysis can be done either experimentally or mathematically. We review some of the ways in which Modal Analysis has been successfully applied to musical instruments in the string, wind, and percussion families.
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Modal Analysis of vibrations in musical instruments
Journal of the Acoustical Society of America, 1990Co-Authors: Thomas D. Rossing, Uwe J. HansenAbstract:Modal Analysis describes the properties of an elastic structure in terms of its modes of vibration. Videotape is a convenient medium for presenting the results of experimental Modal Analysis of structural vibrations, both in a lecture and in the laboratory. Some modes of vibration of several musical instruments, including a guitar, a handbell, a Caribbean steel drum, a snare drum, and a plane soundboard, will be demonstrated on videotape.
N. Moller - One of the best experts on this subject based on the ideXlab platform.
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Application of Operational Modal Analysis on cars
SAE transactions, 2003Co-Authors: N. Moller, S. GadeAbstract:Operational Modal Analysis, also known as Output Only Modal Analysis or Ambient Modal Analysis, has for over a decade been used for extracting Modal parameters from civil engineering structures and is now also being used for mechanical structures, such as on-road and inflight testing. The advantage of this method is that no artificial excitation needs to be applied to the structure and if artificial loading is required, the force does not need to be measured. All parameter estimation is based on the response signals, thereby minimising the amount of work required for test preparation. As the loading force is unknown in Operational Modal Analysis, specially designed Modal parameter estimation techniques need to be used. In classical Modal Analysis many validation tools are based upon the known force, but if this is not known, other validation tools must be implemented. In addition, different estimation techniques are used, so that results can be compared. Figure 1 Test Object. Passenger Car in the Bruel & Kjaer Laboratory Two classes of identifiers will be described in this paper. A frequency domain based method (Frequency Domain Decomposition) and a time domain based (Stochastic Subspace Identification). Results from both methods will be discussed and compared. The paper discusses in general the use of Operational Modal Analysis on cars. Results are shown on a fully assembled car. For further background of the technique please refer to ref. [1] and ref [2].
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Operational Modal Analysis on an exhaust system
2002Co-Authors: N. Moller, S. GadeAbstract:Operational Modal Analysis also known as Ambient Modal Analysis has an increasing interest in mechanical engineering. Especially on structures where the excitation and not less important the determination ofthe forces constitutes a problem. In this paper Modal Analysis is made on the exhaust system of a passenger car. For estimation of the Modal parameters two scenarios were used: Estimation using only the responses when excited by the engine during operation and classical input output Modal Analysis. The results from the two different methods are compared. When using the response measurements only to estimate the Modal parameters different types of dedicated estimators for Operational Modal Analysis are used and compared.
Fabien Poncelet - One of the best experts on this subject based on the ideXlab platform.
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output only Modal Analysis using blind source separation techniques
Mechanical Systems and Signal Processing, 2007Co-Authors: Fabien Poncelet, Gaetan Kerschen, Jeanclaude Golinval, Damien VerhelstAbstract:The present study carries out output-only Modal Analysis using two blind source separation (BSS) techniques, namely independent component Analysis and second-order blind identification. The concept of virtual source is exploited and renders the application of these BSS techniques possible. The proposed Modal Analysis method is illustrated using numerical and experimental examples.
