Group delay based location template matching method for the identification of the impact location on a plate

Shin, Kihong; Yang, Hongjun; Lee, Sang-Kwon; Lee, Young-Sup

doi:10.1016/j.jsv.2012.12.007

Cited by 16 publications

(6 citation statements)

References 13 publications

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“…However, as mentioned earlier, the fault source power contained in the cross-spectral density function may be too small to observe properly because the measurement sensors are not close to the ideal points near the fault source. This problem may be overcome by using the concept of the fictitious system frequency response function that is used to relate two deterministic signals [15].…”

Section: Principle Of the Two-channel Analysis Methodsmentioning

confidence: 99%

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Machinery Fault Diagnosis Using Two-Channel Analysis Method Based on Fictitious System Frequency Response Function

Shin

Lee

2015

Shock and Vibration

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Most existing techniques for machinery health monitoring that utilize measured vibration signals usually require measurement points to be as close as possible to the expected fault components of interest. This is particularly important for implementing condition-based maintenance since the incipient fault signal power may be too small to be detected if a sensor is located further away from the fault source. However, a measurement sensor is often not attached to the ideal point due to geometric or environmental restrictions. In such a case, many of the conventional diagnostic techniques may not be successfully applicable. In this paper, a two-channel analysis method is proposed to overcome such difficulty. It uses two vibration signals simultaneously measured at arbitrary points in a machine. The proposed method is described theoretically by introducing a fictitious system frequency response function. It is then verified experimentally for bearing fault detection. The results show that the suggested method may be a good alternative when ideal points for measurement sensors are not readily available.

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Section: Principle Of the Two-channel Analysis Methodsmentioning

confidence: 99%

“…The proposed method utilizes the crossspectrum between two simultaneously measured vibration signals. A fictitious system frequency response function (FRF) is then constructed [15]. The fictitious FRF compares the cross-spectrums between healthy and faulty conditions and is used to detect any fault symptoms in a machine.…”

Section: Introductionmentioning

confidence: 99%

Machinery Fault Diagnosis Using Two-Channel Analysis Method Based on Fictitious System Frequency Response Function

Shin

Lee

2015

Shock and Vibration

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“…Other correlation procedures were also considered [43,44] implying the separation of magnitude similarity (M index ). Mindex=1f2−f1∫f1f2Mα(f)df, where Mα=1−tanh(ln3220 log10|Y(f)X(f)|α), where is a reference value in our case = 20, and the shape similarity (S index ) Sindex=1f2−f1∫f1f2Sβ(f)df, Sβ=1−tanh(normalln32|12π ddf[…”

Section: Calibration Of the Imaging Subsystem Of The Minlu Instrumentmentioning

confidence: 99%

Calibration of an Autonomous Instrument for Monitoring Light Pollution from Drones

Fiorentin

Bettanini

Bogoni

2019

Sensors

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The paper presents the calibration activity on the imaging system of the MINLU instrument, an autonomous sensor suite designed for monitoring light pollution using commercial off-the-shelf components. The system is extremely compact and with an overall mass below 3 kg can be easily installed as a payload for drones or sounding balloons. Drones and air balloons can in fact play an important role in completing upward light emission measurement from satellites allowing an increased spatial and time resolution from convenient altitudes and positions. The proposed system can efficiently measure the luminous intensity and the spectral power density of on-ground emissions providing a useful tool to identify polluting sources and to quantify upward light flux. The metrological performance of the imaging system has been verified through an extensive laboratory test activity using referenced light sources: the overall uncertainty of the multi-luminance meter has been calculated to be 7% of the reading, while the multi-spectrometer has shown a full width at half maximum (FWHM) equal to 10 nm within the measuring range between 400 nm and 700 nm. When operating at an altitude of 200 m, the system can achieve a horizontal resolution at a ground level of 0.12 m with a wavelength resolution able to identify the different lamp technology of outdoor light sources, including light-emitting diode (LED) lights that are undetected by satellites.

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“…In the recent work of Liang et al, elements of the two methods were combined to create a distributed coordination algorithm for locating the impact force with greater computational efficiency [31]. 70 However, further studies are required in order to fully explore the effectiveness of this approach.…”

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confidence: 99%

Practical high-fidelity frequency-domain force and location identification

Ghaderi

Dick

Foley

et al. 2015

Computers & Structures

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Identifying the force information and location of an impact event is important for predicting and/or monitoring potential damage to the structures. Directly measuring the impact event and/or locating the impact force is not always possible due to the nature of the impact or the structure. In this work, a new force and location identification method is introduced which utilizes a spectral finite element method (SFEM) model of the structure. The identification technique is demonstrated and studied through its application to beam structures in order to identify impulsive loads. Wave propagation data collected with accelerometers placed on the structure are used in order to determine the impact information.When the impact force is applied between the accelerometers, the calculated force is distributed over the two accelerometer positions on either side of the impact location. The location identification process uses the distribution of the identified force information in order to locate the impact position. This method is performed by matching simulated data to the identified force data by tuning the impact location within the numerical model. When a sufficient level of agreement is achieved, the impact location is determined. In order to validate the results of the numerical studies, identified impact forces and locations are calculated for experimental data and good agreement is observed with the * Corresponding author

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Group delay based location template matching method for the identification of the impact location on a plate

Cited by 16 publications

References 13 publications

Machinery Fault Diagnosis Using Two-Channel Analysis Method Based on Fictitious System Frequency Response Function

Machinery Fault Diagnosis Using Two-Channel Analysis Method Based on Fictitious System Frequency Response Function

Calibration of an Autonomous Instrument for Monitoring Light Pollution from Drones

Practical high-fidelity frequency-domain force and location identification

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