Results 171 to 180 of about 426 (207)
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Multiple Impact Phenomenon in Impact Hammer Testing: Theoretical Analysis and Numerical Simulation
Acta Mechanica Solida Sinica, 2021As conducting an impact hammer testing during experimental modal analysis, the multiple impact phenomenon must be avoided. It is generally recognized that the multiple impact phenomenon is induced by the tester’s improper operation and can be avoided through more careful operation. This study theoretically and numerically investigates the whole process
Junyin Li +5 more
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Impact hammer testing of a railway track
2017Non-destructive dynamic testing such as excitation techniques that use an instrumented hammer and mounted accelerometers has been previously employed for evaluation of structural condition of the track. This paper shows in-situ application of impact hammer testing on an inactive railway line.
Balic, E., McNally, C., Hester, D.
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Multiple Reference Impact Testing for Bridge Assessment with Drop Hammer
Advanced Materials Research, 2012A new drop hammer was designed and used for multiple reference impact testing of two bridges. The drop hammer utilizes a multiple-rebound control system for successfully applying a single impact with repeatable high-level force for bridge testing. Signal analysis results indicate that the drop hammer provides a higher signal-noise ratio and a better ...
Yu Juan Liao, Yun Zhou, Peng Qin
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Modified pendulum hammer in impact tests of adhesive, riveted and hybrid lap joints
International Journal of Adhesion and Adhesives, 2021Abstract This paper presents a modified pendulum hammer adapted to test the impact strength of lap joints. The impact tests of lap specimens exhibited greater repeatability in terms of the results, compared with the tests of block specimens (specimens used in Block Shear Test (ISO 9653)).
Andrzej Komorek, Jan Godzimirski
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Fouling detection using hammer impact test and wireless comunication
2011 IEEE International Instrumentation and Measurement Technology Conference, 2011There is a persistent problem that continues to be a relevant demand for the chemical, petroleum, food and pharmaceutical industries. This problem is the fouling detection in systems of ducts. This work shows how the previous tests to develop a platform for detecting fouling of pipes analyze specific locations using the impact hammer test with wireless
L. C. Lemos +3 more
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Impact hammer test of ITER blanket remote handling system
Fusion Engineering and Design, 2016Abstract An impact hammer test of the full-scale mock-up of the ITER blanket remote handling system (BRHS) was carried out to validate the results of the seismic analysis of the BRHS which were performed using a finite element (FE) model. As the FE analysis of the BRHS predicted a vertical mode ∼8 Hz, which coincides with a major natural frequency of
Yuto Noguchi +5 more
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Fouling Detection based on Vibration Analysis with the Hammer Impact Test
2007 IEEE Instrumentation & Measurement Technology Conference IMTC 2007, 2007Fouling detection is a persistent and relevant problem for the chemical, oil, food and pharmaceutical industries. The fouling process is the slow, unwanted layer deposition of heavy organic and other dissolved solid material out of transported fluids or suspensions onto inner wall surfaces in fluid transport system over an extended period of time. This
Jaidilson Jo da Silva +3 more
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On the prediction of impact noise, X: The design and testing of a quietened drop hammer
Journal of Sound and Vibration, 1986Part V in this series showed that the technique of predicting overall noise levels ( L eq per event) from vibration levels in a drop hammer produces surprisingly accurate results, allowing a good estimate of the contribution of each component to the overall noise.
E.J. Richards, I. Carr
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Unbiased expression of FRF with exponential window function in impact hammer testing
Journal of Sound and Vibration, 2004Abstract The exponential window function is widely used in impact hammer testing to reduce leakage errors as well as to get a nice S/N ratio. The larger the exponential decay rate of the window is, the more effectively the leakage errors are reduced.
Se Jin Ahn, Weui Bong Jeong, Wan Suk Yoo
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A NEW APPROACH TO IMPACT TESTING INSTRUMENTATION USING AN ELECTRONIC SLAVE HAMMER
Mechanical Systems and Signal Processing, 1997Abstract An electronic slave hammer is used to improve the performance of impact testing. The electronic programmer as well as the power electronic circuits are presented. The geometry of the piston tip of the hammer and on duration of contact between the tip and the structure is discussed.
I. Tawfiq, T. Vinh, T. Chouychai
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