Visualization and simulation of a linear explosive-induced pyroshock wave using Q-switched laser and phased array transducers in a space launcher composite structure

Lee, Jung-Ryul; Jang, Jeong Gook; Choi, Min Suk; Kong, Cheol-Won

doi:10.1016/j.optlastec.2014.09.005

Cited by 19 publications

(11 citation statements)

References 5 publications

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“…Recently, laser shock has been used to reconstruct pyroshock in [18]. The pyroshock reconstruction method, using laser shock, had the advantage that it could confirm propagation of pyroshock in real structure nondestructively.…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…Since shock generating and measuring processes are distinct, there are characteristic differences between laser shock and pyroshock, even though both are elastic wave in solid medium. In [18], the reconstructed results has used an algorithm that only adjusts the peak value to compensate for this characteristic difference. This resulted in a below average reconstruction response.…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…To simulate 230 mmlong linear pyrotechnical device, eleven PZT sensors were installed at intervals of 23 mm, as shown in Figure 11(a). The pyrotechnical device used in this paper started to explode from the right and had a principal propagation direction of 19.6 degree [18], so we phase arrayed the laser scanning data and synthesized it as shown in Figure 11(b). The phasedarray laser scanning data were used as ( , , ).…”

Section: Laser Shock Scanning Measurement In Cfrp Specimenmentioning

confidence: 99%

“…Reconstruction of pyroshock using laser shock was first attempted in [18]. In [18], SRS reconstruction results have not been accurate because they tried to compensate for the difference in characteristics between pyroshock and laser shock by simply matching the peak to peak acceleration in the time domain.…”

Section: Comparison Of Developed Algorithm and Previous Algorithmsmentioning

confidence: 99%

“…In [18], SRS reconstruction results have not been accurate because they tried to compensate for the difference in characteristics between pyroshock and laser shock by simply matching the peak to peak acceleration in the time domain. In [19,20], these researchers have developed an algorithm to compensate for the difference in characteristics of laser shock and pyroshock by statistically predicting the amplitude of pyroshock with distance from the explosion source.…”

Section: Comparison Of Developed Algorithm and Previous Algorithmsmentioning

confidence: 99%

See 4 more Smart Citations

Pyroshock Acceleration Field Reconstruction in Temporal and Spectral Domains Based on Laser Shock Scanning and Iterative Decomposition and Synthesis Considering Stop Band Effects

Kim

Jang

Lee

2017

Shock and Vibration

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Pyrotechnic devices are used to separate substructures from main structures. Pyroshock can cause failure in electronic components that are sensitive to high frequency shock. Most of the existing methods to analyze pyroshock have limitations for high frequency simulations and are only available for simulation of point explosive-induced pyroshock. To solve the problem of existing methods, we developed a laser shock-based pyroshock reconstruction algorithm covering high frequency range that can predict linear explosive-induced pyroshock, as well as point explosive-induced ones. The developed algorithm reconstructs pyroshock from laser shock test in both temporal and spectral domains using an iterative signal decomposition and synthesis method. In the signal decomposition and synthesis process, unremoved signals in the stopbands occurred and were compensated by iteration to improve the results. At the end of this paper, various types of pyroshock were processed through the proposed method. Pyroshock wave propagation images and shock response spectrum images were presented as a result. To verify the algorithm, we compared the obtained result with a real pyroshock. The time domain signal was reconstructed with an averaged peak to peak acceleration difference of 20.21%, and the shock response spectrum was reconstructed with an average mean acceleration difference of 25.86%.

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Section: Shock and Vibrationmentioning

confidence: 99%

Section: Shock and Vibrationmentioning

confidence: 99%

Section: Laser Shock Scanning Measurement In Cfrp Specimenmentioning

confidence: 99%

Section: Comparison Of Developed Algorithm and Previous Algorithmsmentioning

confidence: 99%

Section: Comparison Of Developed Algorithm and Previous Algorithmsmentioning

confidence: 99%

See 3 more Smart Citations

Pyroshock Acceleration Field Reconstruction in Temporal and Spectral Domains Based on Laser Shock Scanning and Iterative Decomposition and Synthesis Considering Stop Band Effects

Kim

Jang

Lee

2017

Shock and Vibration

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Effect of fiber orientations of composite panels under far‐field pyroshock

Najeeb¹,

Ramachandran

2017

Polymer Composites

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The effect of different fiber orientations of composite panels of E-Glass/Epoxy under far-field pyroshock is presented in this article. To get the far-field pyroshock response, the experiments are conducted using Biplate technology under low range of input chamber pressures to projectiles of three different lengths. PCB accelerometers and NI-DAQ system with LabView software are used to capture the structural responses in the form of acceleration-time histories and analyze them at selected locations. Abaqus/Explicit code is used in the Finite Element Analysis (FEA) for the pyroshock response of composite panels with different fiber orientations. From the results, it is found that the selected locations on the [0/90/645] s WRM (Woven Roving Mat) laminate experience higher accelerations, above 30% extra, than other fiber orientations. Since [0/90/645] s laminate has lengthier fiber rovings along the diagonal direction, higher Young's modulus along the fiber direction and the most vibration modes are diagonally biased, the response amplitude would be high enough to experience maximum acceleration. The acceleration responses are obtained both from FEA and experiments and show good agreement. POLYM.

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Comparative study of far‐field pyroshock responses of epoxy laminated composite panels

Najeeb¹,

Murugan²

2021

Polymer Composites

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The experimental study on far-field pyroshock responses of carbon/glass/ Kevlar-epoxy composite panels are presented in this article. Bi-Plate Technology is used to conduct all the experiments on different combination of carbon, E-glass, and Kevlar composite panel parameters, with epoxy resin as matrix. The structural responses computed from the acceleration-time histories are analyzed. Low range of chamber pressure and projectiles of three different lengths are used to carry out the experiments so that the farfield response of the test panel is ensured. PCB accelerometers and NI-DAQ system are used to capture the accelerations of panel at selected locations. Among all the composite panels, the one which is of Kevlar-epoxy laminate shows the least acceleration because the said material has high vibrational energy absorption rate. The glass-epoxy laminate being higher mass rate shows the intermediate category and the carbon-epoxy accelerates itself the most. Hence, these types of fibers may be utilized in appropriate areas according to their degree of acceleration to minimize the effect of the farfield pyroshock response.

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Visualization and simulation of a linear explosive-induced pyroshock wave using Q-switched laser and phased array transducers in a space launcher composite structure

Cited by 19 publications

References 5 publications

Pyroshock Acceleration Field Reconstruction in Temporal and Spectral Domains Based on Laser Shock Scanning and Iterative Decomposition and Synthesis Considering Stop Band Effects

Pyroshock Acceleration Field Reconstruction in Temporal and Spectral Domains Based on Laser Shock Scanning and Iterative Decomposition and Synthesis Considering Stop Band Effects

Effect of fiber orientations of composite panels under far‐field pyroshock

Comparative study of far‐field pyroshock responses of epoxy laminated composite panels

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