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Journal articles on the topic 'Impulse hammer'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Ding, Chuan, Yu Huang, Haoqi Chen, Lichao Zhang, Bin Meng, and Yuanhao Gao. "New Hydraulic High-Pressure Impulse Generator for Long-Duration Impulse Tests." Applied Sciences 11, no. 3 (2021): 901. http://dx.doi.org/10.3390/app11030901.

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Water hammer wave is widely applied to test hydraulic components in various areas. A new hydraulic high-pressure impulse generator is presented in this paper in order to provide the standard water hammer wave for long-term usage. A combination of a sleeve and a rotary spool was used to build the impulse generator, and a booster piston was applied to amplify the output pressure. Mathematical models were established using commercial software, and a prototype and a test rig were built based on the simulation results. The experimental results for both single wave and repeated periods show the feas

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2

Bilonik, I. M., M. M. Berehovenko, D. I. Bilonik, O. Ye Kapustian, A. H. Smakohrai, and S. O. Shumikin. "Selection of a material and a hardening method for the impact part of the hammers of the electrostatic precipitators shaking mechanism." Reporter of the Priazovskyi State Technical University. Section: Technical sciences, no. 41 (December 24, 2020): 52–59. https://doi.org/10.31498/2225-6733.41.2020.226182.

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The article presents data on the hardening of the hammers of the percussive mechanism of shaking the receiving and corona electrodes of electrostatic precipitators by electroslag surfacing. The review and analysis of publications in the field of gas purification made it possible to reveal the current trends towards an increase in the efficiency of impact impulse transmission of the electrostatic precipitator shaking mechanism by reducing energy consumption and maintaining a high efficiency of the impact impulse. Since the efficiency of the percussive mechanism for shaking the electrostatic pre

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3

Hong, Sokgun, Un Chol Han, Gum Chol Kim, Kwang Myong Ri, and Song Ri. "Numerical Simulation of the Collision Breakage Process between the Agglomerate and Hammer in a Hammer Crusher Using DEM." Shock and Vibration 2023 (July 25, 2023): 1–14. http://dx.doi.org/10.1155/2023/2838179.

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This paper focuses on simulating the collision breakage process between the agglomerate and hammer in a hammer crusher by the discrete element method (DEM) as the interaction between particles. This enables us to consider the energy change in the collision breakage process of the hammer. The agglomerate model is built by using the EDEM 2.7 software according to the principle of closest packing in crystallography, while the hammer model is modeled into an assembly of different sizes of spherical particles to make the collision breakage process between the agglomerate and hammer as the one of in

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4

Myasnikov, A. A. "THEORETICAL STUDIES OF THE MODE OF OPERATION OF SHOCK SYSTEMS." MECHANICS & TECHNOLOGIES, no. 3 (September 30, 2023): 90–97. http://dx.doi.org/10.55956/idiy8927.

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Base principles of the Method of partial waves for the solve of direct and return problems for systems of the equations of hyperbolic type are stated. As an example the problem of definition of geometry of a hammer under the form of the first wave of an impulse generated by a hammer in a homogeneous cylindrical rod is considered.

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Li, xiu, hao jie Yang, pei lin Dou, and shi fa Zhao. "Analysis on water hammer protection of FPSO ballast water system." Journal of Physics: Conference Series 2029, no. 1 (2021): 012125. http://dx.doi.org/10.1088/1742-6596/2029/1/012125.

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Abstract In practical engineering, the protection of FPSO water hammer is very important. Through simulation analysis, the relevant data are obtained to provide reference for relevant engineering practice. A general-purpose FPSO ballast water pipe network system was established by aft impulse software, and water hammer simulation calculation and analysis were carried out to find out the maximum pressure position of water hammer phenomenon. According to the water hammer generation mechanism, the simulation research was carried out by two-stage valve closing and adding surge tank into the pipeli

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6

Singh, Prakash, Sharad Trivedi, Viren Menezes, and Hamid Hosseini. "Dynamic Calibration and Validation of an Accelerometer Force Balance for Hypersonic Lifting Models." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/813759.

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An accelerometer-based force balance was designed and developed for the measurement of drag, lift, and rolling moment on a blunt-nosed, flapped delta wing in a short-duration hypersonic shock tunnel. Calibration and validation of the balance were carried out by a convolution technique using hammer pulse test and surface pressure measurements. In the hammer pulse test, a known impulse was applied to the model in the appropriate direction using an impulse hammer, and the corresponding output of the balance (acceleration) was recorded. Fast Fourier Transform (FFT) was operated on the output of th

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7

SHIMADA, Michio, Tokuharu YOSHII, and Takeshi NARUSE. "Accuracy assessment of thickness measurement by an impulse hammer." Proceedings of the 1992 Annual Meeting of JSME/MMD 2002 (2002): 457–58. http://dx.doi.org/10.1299/jsmezairiki.2002.0_457.

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8

Kandagal, S. B. "Piezoceramic (PZT) patch in Impulse hammer for modal analysis." Indian Journal of Science and Technology 2, no. 3 (2009): 1–4. http://dx.doi.org/10.17485/ijst/2009/v2i3.1.

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9

Sibbald, A., C. A. Fairfield Beng, and M. C. Forde Beng. "Impulse Testing of Brickwork Sewers." Journal of Low Frequency Noise, Vibration and Active Control 14, no. 1 (1995): 43–54. http://dx.doi.org/10.1177/026309239501400104.

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This paper describes a study into the application of dynamic testing to the assessment of egg shaped brickwork sewer rings. An investigation procedure using impulsive force hammer excitation with various time and frequency domain analysis techniques is proposed for the location of structural discontinuities in such sewers. The experimental results from a full scale model sewer, and a full scale, in-situ field test on a similar sewer are presented. The chosen non-destructive test method proved to be a convenient tool for the integrity assessment of brickwork sewers.

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10

Wang, Jun, Yan Shen, Hanxu Xia, and Ruoxi Ding. "Analysis of water hammer phenomenon in cooling water piping system of 6500DWT bulk carrier." Journal of Physics: Conference Series 3043, no. 1 (2025): 012101. https://doi.org/10.1088/1742-6596/3043/1/012101.

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Abstract In this paper, according to the structural composition of the cooling water system of a 6500DWT bulk carrier, the model of the seawater cooling system is established by applying AFT Impulse software. First, the system is analyzed in a steady state; then, considering the characteristics of the system operation, we determine the typical valve shutdown and pump stopping conditions to be analyzed to elaborate the influence of water hammer pressure on the piping system in different conditions. Then, we calibrate to ensure the system complies with the design requirements. Aiming at the work

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11

Hu, Yuning, Wei Wang, Wei Liu, Zihan Chen, Jie Zhou, and Zhihong Fu. "A Portable Tunnel Electromagnetic Impulse Shock Source." Sensors 23, no. 9 (2023): 4213. http://dx.doi.org/10.3390/s23094213.

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Early seismic prediction in tunnels has become a necessary task to prevent construction risks. The type and performance of the seismic source are crucial factors that affect its efficiency and prediction accuracy. Among the existing main types of tunnel seismic sources, both explosive and spark sources require pre-drilling and pose safety hazards. In addition, explosive sources pose a risk of damage to tunnel structure walls. Spark sources must be used in a water medium. Artificial hammer sources have weak energy and short prediction distance. This paper proposes a portable tunnel electromagne

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12

Hnilica, P., J. Thýn, and B. Pechlák. "Analysis of hammer mill response to impulse inlet of radioactive tracer." Powder Technology 45, no. 2 (1986): 183–90. http://dx.doi.org/10.1016/0032-5910(66)80012-8.

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13

Kim, Sang Hyun. "Impulse Response Method for Pipeline Systems Equipped with Water Hammer Protection Devices." Journal of Hydraulic Engineering 134, no. 7 (2008): 961–69. http://dx.doi.org/10.1061/(asce)0733-9429(2008)134:7(961).

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14

Reynolds, P., and A. Pavic. "IMPULSE HAMMER VERSUS SHAKER EXCITATION FOR THE MODAL TESTING OF BUILDING FLOORS." Experimental Techniques 24, no. 3 (2000): 39–44. http://dx.doi.org/10.1111/j.1747-1567.2000.tb00911.x.

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15

Martin, J., and M. C. Forde. "Influence of concrete properties on impulse hammer spectrum and compression wave velocity." Construction and Building Materials 9, no. 4 (1995): 245–55. http://dx.doi.org/10.1016/0950-0618(95)00027-d.

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16

Park, Hyungsoon, and Youn-sik Park. "Transient Response of an Impacted Beam and Indirect Impact Force Identification Using Strain Measurements." Shock and Vibration 1, no. 3 (1994): 267–78. http://dx.doi.org/10.1155/1994/781574.

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The impulse response functions (force-strain relations) for Euler–Bernoulli and Timoshenko beams are considered. The response of a beam to a transverse impact force, including reflection at the boundary, is obtained with the convolution approach using the impulse response function obtained by a Laplace transform and a numerical scheme. Using this relation, the impact force history is determined in the time domain and results are compared with those of Hertz's contact law. In the case of an arbitrary impact, the location of the impact force and the time history of the impact force can be found.

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17

Cong, Xiao Yan, Zeng Cai Wang, and Xian De Ma. "Hydraulic Support Tail Beam Natural Characteristics Analysis for Coal and Rock Identification." Applied Mechanics and Materials 687-691 (November 2014): 77–80. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.77.

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Accurate vibration signals are important for signal analysis in the method of analysis vibration of hydraulic support tail beam. Signal acquisition position needs multiple comparison and optimization on site. Natural characteristics analysis of the hydraulic support tail beam can offer theoretical guidance to optimize sensor installation position. In this paper, impulse hammer excitation was used to analyze the inherent property of the hydraulic support tail beam which provided useful information for setting the signal pick-up place.

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18

Singh, P., V. Menezes, K. J. Irimpan, and H. Hosseini. "Impulse Force Balance for Ultrashort Duration Hypersonic Test Facilities." Shock and Vibration 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/803253.

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This paper presents the measurement of side force, pitching, and yawing moments on a model, using an accelerometer force balance, in a short duration hypersonic shock tunnel. The test model is a blunt-nosed, flapped delta wing, mounted on a support sting through a force balance. The flexible rubber bushes constituting the balance allow the model to float freely on the sting during the test. The accelerometers were located in the model to record accelerations in the directions of interest. The model was tested in shock tunnel at Mach 8 at different angles of incidence with the freestream. Dynam

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19

Iskovych-Lototsky, Rostyslav, Yaroslav Ivanchuk, and Yevheniy Ivashko. "Mathematical modeling exertion on the work unit vibrating hammer with hydro-impulse drive." Gіrnichі, budіvelnі, dorozhnі ta melіorativnі mashini, no. 91 (June 19, 2018): 5–12. http://dx.doi.org/10.26884/gbdmm1891.0101.

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20

Cummiskey, Brian, Goutham N. Sankaran, Kevin G. McIver, et al. "Quantitative evaluation of impact attenuation by football helmets using a modal impulse hammer." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 233, no. 2 (2019): 301–11. http://dx.doi.org/10.1177/1754337118823603.

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Concussions and changes in neurophysiology due to sub-concussive blows are common in contact sports, motivating a need for improved safety systems. While there have been attempts to determine whether or not new helmet designs influence the incidence of concussion, the results to date have been inconclusive. Consequently, the goal of this study was to evaluate the ability of modern football helmets to mitigate linear impacts directed normal, as well as oblique, to the surface of the helmeted head using a system that quantifies both the input load and the resulting accelerations of a Hybrid III

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21

McIver, Kevin G., Goutham N. Sankaran, Patrick Lee, et al. "Impact attenuation of male and female lacrosse helmets using a modal impulse hammer." Journal of Biomechanics 95 (October 2019): 109313. http://dx.doi.org/10.1016/j.jbiomech.2019.08.007.

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22

Shi, Chong, and Su-le Liu. "An underwater stress-testing technique for the heavy-hammer tamping of a rubble-mound foundation." Advances in Mechanical Engineering 10, no. 1 (2018): 168781401875495. http://dx.doi.org/10.1177/1687814018754954.

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Rubble-mound foundations are commonly used in port-channel engineering and protection embankment. Heavy tamping is usually used to attain the required total compactness and bear capacity of such foundations. Monitoring and controlling the tamping-impact stresses is difficult because of the noncontinuous nature of the medium, particularly under the high impulse conditions (e.g. large-scale stresses and rapid attenuation) of the tamping process. In this research, a new instrument for measuring tamping stress incorporating a wide stress range and high sampling frequency was designed for use under

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23

Trubin, A. S., and Yu N. Baranov. "Analytical description breaker drives and its indicators economy of energy conversion." Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 8, no. 2 (2022): 150–58. http://dx.doi.org/10.22281/2413-9920-2022-08-02-150-158.

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The issues of optimizing the parameters of a hydraulic hammer on the basis of differentiating a complex impulse system into subsystems by drawing up differential equations for all bodies participating in motion and using the theorem on changing the kinetic energy and momentum are considered. It has been established that the force of fluid pressure is the main source of friction in the sealing unit, the value of which depends on the pressure of the working medium, the coefficient of friction of the cuff material and the size of the contact surface of the seal. The research results can be used i

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24

Wang, Xu, Tian Yun Li, Xiang Zhou Zheng, and Xiang Zhu. "Optimization of Pendulum for a High-Impact Shock Testing Machine with Medium Weight." Applied Mechanics and Materials 437 (October 2013): 346–52. http://dx.doi.org/10.4028/www.scientific.net/amm.437.346.

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Collision impulse to pendulum shaft is tend to be generated when hammer impacting the anvil. In order to eliminate the collision impulse and find a preferential size of the pendulum, based on the rigid body dynamical model, the conditions of the coincidence of the center of strike and the center of percussion are established; calculation formula of the distance between the axis of the pendulum shaft and the center of percussion is derived. By selecting certain geometric parameters of the pendulum as design variables and transferring the multi-objective nonlinear optimal design problem into sin

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25

Lazarevikj, Marija, Viktor Iliev, and Valentino Stojkovski. "Nestacionarno strujanje fluida u paralelnom cevovodu izrađenom od različitih materijala." Energija, Ekonomija, Ekologija 23, no. 1 (2021): 42–49. http://dx.doi.org/10.46793/eee21-1.42l.

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Transient fluid flow and the occurrence of water hammer in their specifics include the conditions of the environment in which the flow takes place. The variety of pipeline construction material (steel, polyethylene or other material) defines the conditions for the development of water hammer. The construction of parallel hydraulically connected pipelines from different materials and mutual influence in the conditions of transient fluid flow conditions of operation is the subject of research in this paper. The research was performed numerically on long (line) pipelines. The AFT-Impulse software

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26

Curtin, Joseph, Luca Jost, and Chris Rogers. "A rig for measuring violin sound radiation." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A92. https://doi.org/10.1121/10.0035216.

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A now-standard way of measuring violin sound radiation is to tap the bridge with a miniature impact hammer while a microphone samples the resulting sound field. At least three factors complicate the process: (1) the strings exert three-dimensional forces at the bridge; (2) radiation becomes increasingly directional above 1 kHz; and (3) unless measurements are done under anechoic conditions, the acoustics of the measurement space must be considered. This video describes a rig that uses a solenoid-driven hammer, two driving directions (one horizontal at the bass corner of the bridge; the other v

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Bacci, Nicholas, Tanya Nadine Augustine, Hugh G. P. Hunt, et al. "Harnessing Thor's Hammer: Experimentally induced lightning trauma to human bone by high impulse current." Forensic Science International: Synergy 3 (2021): 100206. http://dx.doi.org/10.1016/j.fsisyn.2021.100206.

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28

Tishchenko, I. V., V. V. Chervov, and B. N. Smolyanitsky. "Evaluation of Layout of Air Drill Hammer with Smooth Adjustment of Impact Impulse Frequency." Journal of Mining Science 53, no. 1 (2017): 109–16. http://dx.doi.org/10.1134/s106273911701192x.

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29

Rucka, Magdalena, and Krzysztof Wilde. "Guided Waves in Steel Rails – Experimental Works and Wavelet Signal Processing." Key Engineering Materials 347 (September 2007): 115–20. http://dx.doi.org/10.4028/www.scientific.net/kem.347.115.

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This paper presents experimental study on dispersive waves propagation in steel rails. The propagation of longitudinal and transverse waves was generated by an impulse hammer and measured in three points. Wavelet transform (WT) and short time Fourier transform (STFT) were applied to analyze the time signals. Analysis of signal by STFT does not provide a proper timefrequency representation due to a fixed size window. The wavelet transform can effectively identify the time-frequency components in waves. The wavelet signal processing of the experimental wave propagation signals is intended to be

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30

Simpson, JP, and AJ Hamer. "How Noisy are Total Knee and Hip Replacements?" Journal of Perioperative Practice 27, no. 12 (2017): 292–95. http://dx.doi.org/10.1177/175045891702701204.

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Orthopaedic theatre can be noisy. Fifty percent of orthopaedic theatre staff have features of noise-induced hearing loss (NIHL). In this study, decibel (dB) levels were recorded in 17 total knee replacements (TKRs) and 11 total hip replacements (THRs). Noise levels reached 105.6dB(A) using a hammer and 97.9dB(A) with an oscillating saw. Exposure to levels above 90dB (which occurred in every case) even for short time periods is proven to cause irreversible loss of hearing. Tools used in orthopaedic theatre produce impulse noises that can cause NIHL. Further investigation is required.

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31

Ryu, Semin, and Seung-Chan Kim. "Knocking and Listening: Learning Mechanical Impulse Response for Understanding Surface Characteristics." Sensors 20, no. 2 (2020): 369. http://dx.doi.org/10.3390/s20020369.

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Inspired by spiders that can generate and sense vibrations to obtain information regarding a substrate, we propose an intelligent system that can recognize the type of surface being touched by knocking the surface and listening to the vibrations. Hence, we developed a system that is equipped with an electromagnetic hammer for hitting the ground and an accelerometer for measuring the mechanical responses induced by the impact. We investigate the feasibility of sensing 10 different daily surfaces through various machine-learning techniques including recent deep-learning approaches. Although some

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32

Chen, Zhen Fu, Kui Zhang, and Tao Li. "Experiment Research on the Shock Resistance of Magnetite Concrete." Applied Mechanics and Materials 744-746 (March 2015): 1406–11. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1406.

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Through magnetite concrete beam under the action of gravity drop hammer impact dynamic bending test, reasonable testing program was designed to realize the whole process of dynamic test data acquisition, beam load and impulse, time history curves of displacement and force dynamic force - displacement curve and dynamic strain of fracture zone curve. By observing the destruction of the different strain rate，the constitutive relation of dynamic strength changing with the loading rate and input energy was studied. At the same time, the strain rate，the fracture process of different rate of damage a

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Hur, Jisung, Sanghyun Kim, and Hyunjun Kim. "Water hammer analysis that uses the impulse response method for a reservoir-pump pipeline system." Journal of Mechanical Science and Technology 31, no. 10 (2017): 4833–40. http://dx.doi.org/10.1007/s12206-017-0931-5.

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Tsuchikane, A., Y. Nakatsuchi, and A. Nomura. "The Influence of Joints and Soft Tissue on the Natural Frequency of the Human Tibia Using the Impulse Response Method." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 209, no. 3 (1995): 149–55. http://dx.doi.org/10.1243/pime_proc_1995_209_337_02.

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The influences of the joints adjacent to the human tibia, the surrounding soft tissue and the fibula on the vibrational parameters of the tibia (that is natural frequency, mode shape and damping ratio) are in need of clarification. Using five cadaveric human legs, the resonant frequency and damping ratio were measured with an accelerometer placed on the medial tibial condyle while the medial malleolus was impacted by an impulse hammer. The legs were subsequently dissected and the measurements were made in six conditions. The mode shape was obtained by use of modal analysis. Hammer impacts were

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Berardi, Umberto, and Gino Iannace. "Additive manufacturing for minimizing vibration damages in the water-stop tray of washing machines." Journal of Low Frequency Noise, Vibration and Active Control 36, no. 2 (2017): 193–99. http://dx.doi.org/10.1177/0263092317712017.

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The present work aims to study the water-stop tray, a front-loading component of a washing machine. As most of the components of washing machines, the water-stop tray suffers significant vibrations especially when the spin speed increases. A vibrational analysis of the current typical design was realized. Then, four modified trays were investigated and a hammer impulse response was recorded using 13 accelerometers in order to measure the frequency response of each tray. The results allow to identify the key parameters that affect the vibrational response of a water-stop tray. Finally, the comp

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Milewicz, Julia, Daniel Mokrzan, and Grzegorz Szymański. "The assessment of the technical condition of SO-3 engine turbine blades using an impulse test." Combustion Engines 184, no. 1 (2021): 24–29. http://dx.doi.org/10.19206/ce-133872.

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The paper presents the effects of the application of an experimental impulse test as a method of diagnosis of the technical condition of an SO-3 engine turbine blade fitted in a TS-11 Iskra aircraft. The aim of the test was to investigate the frequency characteristics of the blades and discuss differences between the frequency spectrum of the investigated component before and after its damage. The acoustic response measurements were performed to the signal generated by an impact hammer on the fully functional and intentionally damaged blades. The recorded signals were converted from the domain

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Nanda, Soumya Ranjan, Vinayak Kulkarni, Niranjan Sahoo, and Viren Menezes. "A comparison of accelerometer and piezofilm-based force balances for hypersonic shock tunnels." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 14 (2019): 5310–20. http://dx.doi.org/10.1177/0954410019845200.

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A blunt double-cone model, equipped with a three-component accelerometer or piezofilm-based force balance system, is tested in the IITB-Shock Tunnel at 0 º and 10 º angle of inclinations during force measurement experiments. Conventional accelerometer force balance theory and soft computing-based adaptive neuro fuzzy inference system have been adopted to recover the axial and normal forces. In order to arrive at the time varying forces, these balances are calibrated using impulse hammer tests at single or multiple points. Necessity of multipoint calibration has also been demonstrated during re

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Palas, H., W. C. Hsu, and A. A. Shabana. "On the Use of Momentum Balance and the Assumed Modes Method in Transverse Impact Problems." Journal of Vibration and Acoustics 114, no. 3 (1992): 364–73. http://dx.doi.org/10.1115/1.2930271.

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The objective of this investigation is to examine the validity of applying the assumed modes method and the generalized impulse momentum approach that involves the coefficient of restitution in the analysis of transverse impact in constrained elastic systems. A simple impact model that consists of a rotating beam which is subjected to a transverse impact by a mass (impact hammer) moving with a constant velocity is used. For the purpose of comparison and in order to check the validity of using the proposed technique, the transverse deformation of the beam with respect to the beam coordinate sys

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Kouguchi, Junichi, Shingo Tajima, and Hayato Yoshioka. "Machine-Learning-Based Model Parameter Identification for Cutting Force Estimation." International Journal of Automation Technology 18, no. 1 (2024): 26–38. http://dx.doi.org/10.20965/ijat.2024.p0026.

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Recently, there has been an increased demand for precise monitoring of the milling process using machine tools through a simple and cost-effective method. Accurate estimation of cutting forces is highly effective for this monitoring, and one approach is the modeling of tool spindles and tables of a machine tool. To model machine structures, well-known methods involving the use of impulse hammer response or structural analysis exist. However, the complex modeling is hard to achieve when using the impulse response. Moreover, it is often considerably difficult to achieve the modeling with structu

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40

Gu, Jianxiao, Liancheng Li, Xin Huang, and Hui Chen. "Study on Shear Performance of Corroded Steel Fiber Reinforced Concrete Beams under Impact Load." Materials 17, no. 11 (2024): 2566. http://dx.doi.org/10.3390/ma17112566.

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With the growing use of steel-fiber-reinforced-concrete (SFRC) beams in environmentally friendly and rapid construction, it is essential to assess their impact performance. These beams may encounter unexpected impact loadings from accidents or terrorist attacks during service life. This study explored the impact of steel fiber content and drop hammer height on the impact load testing of corrosion-treated SFRC beams. Experiments were conducted with varying steel fiber contents (0%, 0.25%, 0.5%, 0.75%, and 1.0%), and drop hammer height (1 m, 2 m, and 3 m). The corrosion test demonstrates that SF

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Utami, Sentagi Sesotya, Abdurrahman Mappuji, Balza Achmad, et al. "Design of an Acoustic-Based Nondestructive Test (NDT) Instrument to Predict the Modulus of Elasticity of Wood." Engineering Journal 24, no. 6 (2020): 109–16. http://dx.doi.org/10.4186/ej.2020.24.6.109.

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Modulus of elasticity (E) can predict the mechanical characteristics, as well as grade the quality of wood. The Destructive Test (DT) method is the more commonly used, where the wood sample is split up when being tested. This research used the NDT method based on the longitudinal stress wave method (LSWM) whilst utilizing handheld instruments. The calculated E-dynamic (Ed) from the NDT method was compared with the E-static (Es) from the DT method to validate the technique. Six different wood types were tested with ten samples of each kind. An average R-value of 0.898 was obtained, indicating a

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Kiyama, Akihito, Yoshiyuki Tagawa, Keita Ando, and Masaharu Kameda. "Effects of a water hammer and cavitation on jet formation in a test tube." Journal of Fluid Mechanics 787 (December 15, 2015): 224–36. http://dx.doi.org/10.1017/jfm.2015.690.

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We investigate the motion of a gas–liquid interface in a test tube induced by a large acceleration via impulsive force. We conduct simple experiments in which the tube partially filled with a liquid falls under gravity and hits a rigid floor. A curved gas–liquid interface inside the tube reverses and eventually forms a so-called focused jet. In our experiments, there arises either vibration of the interface or an increment in the velocity of the liquid jet, accompanied by the onset of cavitation in the liquid column. These phenomena cannot be explained by a considering pressure impulse in a cl

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Woodhouse, J., J. C. Rene, C. S. Hall, L. T. W. Smith, F. H. King, and J. W. McClenahan. "The Dynamics of a Ringing Church Bell." Advances in Acoustics and Vibration 2012 (December 23, 2012): 1–19. http://dx.doi.org/10.1155/2012/681787.

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Church bell ringing as practised in the UK involves large-amplitude motions of both bell and clapper. A simulation model is developed and validated against experimental measurements. It is shown that the clapper does not hit the bell with a single impact but a long series of bounces, and this has important consequences for the decay profile of the bell vibration. Information relevant to bell-ringers and bell-hangers is collected in a series of design charts derived from the simulation model. These charts can assist in the diagnosis and correction of faults. Arising from the analysis of the bou

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Gierlak, Piotr, Paulina Pietruś, and Dariusz Szybicki. "Analysis of Vibrations of the IRB 2400 Industrial Robot." Pomiary Automatyka Robotyka 29, no. 2 (2025): 53–57. https://doi.org/10.14313/par_256/53.

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This article provides an analysis of low-frequency vibrations in the IRB 2400 industrial robot using motion amplification technology based on image analysis. This technology allows visualisation of the vibration of the entire robot and analysis of the vibrations of the robot points that can be selected after the image acquisition process has been performed. Impulse force generated with a modal hammer was used to induce robot vibrations. A vibration analysis has been performed that takes into account the different positions of the robot arm. The analysis indicated a strong relationship between

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Bachrathy, Daniel, Adam K. Kiss, Attila Kossa, Szabolcs Berezvai, David Hajdu, and Gabor Stepan. "In-Process Monitoring of Changing Dynamics of a Thin-Walled Component During Milling Operation by Ball Shooter Excitation." Journal of Manufacturing and Materials Processing 4, no. 3 (2020): 78. http://dx.doi.org/10.3390/jmmp4030078.

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During the milling of thin-walled workpieces, the natural frequencies might change radically due to the material removal. To avoid resonant spindle speeds and chatter vibration, a precise knowledge of the instantaneous modal parameters is necessary. Many different numerical methods exist to predict the changes; however, small unmodelled effects can lead to unreliable results. The natural frequencies could be measured by human experts based on modal analysis for an often interrupted process; however, this method is not acceptable during production. We propose an online measurement method with a

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Orzechowski, Michał, and Piotr Budniak. "Temperature dependence of sound wave propagation in as a diagnostic tool for healthy and rotten black alder (Alnus glutinosa (L.) Gaertn). trees trunks." Forest Resaerch Institute 74 (4) (December 1, 2013): 285–91. https://doi.org/10.2478/frp-2013-0027.

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The aim of this study was to determine how thermal conditions affect the speed of sound wave propagation, in trunks of living alder Alnus glutinosa (L.) Gaertn. trees. This method in practiced when diagnosing the presence of intern.al decay in standing trees. Field work was carried out four times at different temperatures (+13°C, +3°C, -7°C and -16°C) using an lmpulse Hammer. There was a significant correlation between the thermal conditions and the speed of sound wave propagation. Therefore, temperature must be taken into account to correctly diagnose tree health and timber qu

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Scanlan, Jamie, Francis Li, Olga Umnova, Gyorgy Rakoczy, Nóra Lövey, and Pascal Scanlan. "Detection of Osteoporosis from Percussion Responses Using an Electronic Stethoscope and Machine Learning." Bioengineering 5, no. 4 (2018): 107. http://dx.doi.org/10.3390/bioengineering5040107.

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Osteoporosis is an asymptomatic bone condition that affects a large proportion of the elderly population around the world, resulting in increased bone fragility and increased risk of fracture. Previous studies had shown that the vibroacoustic response of bone can indicate the quality of the bone condition. Therefore, the aim of the authors’ project is to develop a new method to exploit this phenomenon to improve detection of osteoporosis in individuals. In this paper a method is described that uses a reflex hammer to exert testing stimuli on a patient’s tibia and an electronic stethoscope to a

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Qu, Xing-tian, Jia-he Zhang, and Xin Wang. "Analysis and Research on the Modal Experiment of Series-Parallel Hybrid Grinding and Polishing Machine." MATEC Web of Conferences 175 (2018): 02018. http://dx.doi.org/10.1051/matecconf/201817502018.

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In order to improve the dynamic performance of the grinding machine and improve the machining precision of the machine tool, a modal experiment is conducted on the complete machine and main sub-structures of the series-parallel hybrid grinding and polishing machine tool according to the basic theory of experimental modal analysis. Also, hammer impulse excitation and varied-time-based sampling methods are adopted to perform experimental modal analysis. Meanwhile, the eigensystem realization algorithm (ERA) is utilized to identify modal parameters, so that the low-order natural frequency, dampin

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SHIMADA, Michio, Tokuharu YOSHII, and Takeshi NARUSE. "K-0419 Investigation on a thickness measuring method using an impulse hammer based on repulsion behavior of steel plates." Proceedings of the JSME annual meeting I.01.1 (2001): 117–18. http://dx.doi.org/10.1299/jsmemecjo.i.01.1.0_117.

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Pancotti, Anthony P., Matthew Gilpin, and Martin S. Hilario. "Comparison of electrostatic fins with piezoelectric impact hammer techniques to extend impulse calibration range of a torsional thrust stand." Review of Scientific Instruments 83, no. 3 (2012): 035109. http://dx.doi.org/10.1063/1.3690385.

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