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Artigos de revistas sobre o tema "Wall impulse response"

Autor: Grafiati

Publicado: 9 de novembro de 2024

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1

Xu, Qian. "Damage Index Analysis of Retaining Wall Structures Based on the Impulse Response Function and Virtual Impulse Response Function." Shock and Vibration 2021 (October 18, 2021): 1–21. http://dx.doi.org/10.1155/2021/9741732.

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To identify the damage within retaining wall structures, the Hilbert–Huang Transforms of the impulse response function and virtual impulse response function were performed. The Hilbert marginal energy ratio spectrums of the impulse response function and virtual impulse response function were acquired. To reflect damage information effectively, those bands with stronger damage sensitivity were extracted via the threshold value ε0. Then, the Hilbert feature bands, which were more sensitive to damage within retaining walls, were selected by considering the contribution of the residual band to the

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2

Vadarevu, Sabarish B., Sean Symon, Simon J. Illingworth, and Ivan Marusic. "Coherent structures in the linearized impulse response of turbulent channel flow." Journal of Fluid Mechanics 863 (January 30, 2019): 1190–203. http://dx.doi.org/10.1017/jfm.2019.15.

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We study the evolution of velocity fluctuations due to an isolated spatio-temporal impulse using the linearized Navier–Stokes equations. The impulse is introduced as an external body force in incompressible channel flow at $Re_{\unicode[STIX]{x1D70F}}=10\,000$. Velocity fluctuations are defined about the turbulent mean velocity profile. A turbulent eddy viscosity is added to the equations to fix the mean velocity as an exact solution, which also serves to model the dissipative effects of the background turbulence on large-scale fluctuations. An impulsive body force produces flow fields that ev

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3

Au, Eu Ving, Gregory MacRae, Didier Pettinga, Bruce Deam, Vinod Sadashiva, and Hossein Soleimankhani. "Seismic response of torsionally irregular single story structures." Bulletin of the New Zealand Society for Earthquake Engineering 52, no. 1 (2019): 44–53. http://dx.doi.org/10.5459/bnzsee.52.1.44-53.

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Impulse ground motions are applied to single story structures with different in-plane wall strength and stiffness, rotational inertia, and out-of-plane wall stiffness to obtain the dynamic response considering torsion. A simple hand method to evaluate the impulse response is developed. It is shown that the median increase in response of the critical component considering torsion from many earthquake records is similar to that from impulse records. Using this information, a simple design methodology is proposed which enables the likely earthquake response of critical elements considering torsio

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4

Wei, Xue Ying, Tuo Huang, and Nan Li. "Numerical Derivation of Pressure-Impulse Diagrams for Unreinforced Brick Masonry Walls." Advanced Materials Research 368-373 (October 2011): 1435–39. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1435.

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Pressure-impulse diagrams have been extensively used for damage assessments of structural components subject to a specified blast loading. In this paper, a numerical method is used to generate pressure-impulse diagrams for unreinforced masonry walls subjected to blast loading. A previously developed plastic damage material model accounting for strain rate effects is used for brick and mortar. Three levels of damage criteria are defined based on maximum deflection of the wall and rotation of the supports. The obtained blast response for unreinforced masonry walls are validated against field tes

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5

Jia, Zhenzhen, Qing Ye, and He Li. "Damage Assessment of Roadway Wall Caused by Dynamic and Static Load Action of Gas Explosion." Processes 11, no. 2 (2023): 580. http://dx.doi.org/10.3390/pr11020580.

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In order to obtain the damage characteristics of a roadway wall caused by a gas explosion, the damage evaluation theory of a roadway wall under the dynamic and static loads of a gas explosion is analyzed in this paper. Meanwhile, an evaluation method (overpressure–impulse criterion) is selected to evaluate the damage of the roadway wall under the impact load of the gas explosion. A mathematical model and a physical analysis model of the roadway wall damage are established by LS-DYNA software. The dynamic response of the roadway wall caused by the dynamic and static loads of the gas explosion i

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6

Xu, Qian. "Damage Identification Investigation of Retaining Wall Structures Based on a Virtual Impulse Response Function." Shock and Vibration 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/1346939.

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To eliminate the influence of excitation on the wavelet packet frequency band energy spectrum (ES), ES is acquired via wavelet packet decomposition of a virtual impulse response function. Based on ES, a character frequency band vector spectrum and damage eigenvector spectrum (DES) are created. Additionally, two damage identification indexes, the energy ratio standard deviation and energy ratio variation coefficient, are proposed. Based on the damage index, an updated damage identification method for retaining wall structures is advanced. The damage state of a retaining wall can be diagnosed th

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7

Wu, Di, Fangshuo Mo, and Jianmin Ge. "Effects of coupling between loudspeaker and wall on impulse response measurement." Journal of the Acoustical Society of America 131, no. 4 (2012): 3284. http://dx.doi.org/10.1121/1.4708279.

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8

Li, Wen Sheng, Hui Yang, and Bo Zhang. "Dynamic Analysis on Explosion Resistance Performance of Reinforced Concrete Wall." Advanced Materials Research 1078 (December 2014): 162–65. http://dx.doi.org/10.4028/www.scientific.net/amr.1078.162.

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Based on the finite element software ABAQUS, this paper deals with numerical simulation to dynamic response of reinforced concrete wall under blast loading. Study shows that the explosion resistance performance of the wall with four edges fixed or with two opposite edges fixed are better than that of the wall one edge fixed and another opposite edge simply supported. The greater the explosion impulse, the bigger the maximum displacement of the wall. When reinforcement ratio of the wall increases, the explosion resistance performance of the wall will be improved. At the same time, reasonable re

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9

Gaiser, James E., Terrance J. Fulp, Steve G. Petermann, and Gary M. Karner. "Vertical seismic profile sonde coupling." GEOPHYSICS 53, no. 2 (1988): 206–14. http://dx.doi.org/10.1190/1.1442456.

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P-wave and S-wave displacements occur at high angles of incidence in vertical seismic profiles (VSPs). Therefore, the coupling of a geophone sonde to the borehole wall must be rigid in all directions. A sonde that is well coupled should have no resonant frequency within the seismic band and should provide geophone outputs that accurately represent the earth’s ground motion. An in‐situ coupling response experiment conducted under normal VSP field conditions provides a measure of the sonde‐to‐borehole wall coupling. The sonde is locked in the borehole and a surface source is excited at different

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10

Pastor, J., B. Soria, and C. Belmonte. "Properties of the nociceptive neurons of the leech segmental ganglion." Journal of Neurophysiology 75, no. 6 (1996): 2268–79. http://dx.doi.org/10.1152/jn.1996.75.6.2268.

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1. The electrical responses of nociceptive (N) lateral and N medial neurons of the leech segmental ganglion to mechanical, chemical, and thermal stimulation of the skin were studied in a superfused ganglion-body wall preparation. 2. Mechanical indentation of the skin > 10 mN evoked in both types of cells a sustained discharge of impulses; afterdischarge was often observed with suprathreshold stimulations. 3. Application to the cutaneous receptive area of 10-100 mM acetic acid or of NaCI crystals and solutions also elicited a firing response in N medial and N lateral cells. In contrast, caps

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11

Shi, Cheng, Zhi-Kang Ni, Jun Pan, Zhijie Zheng, Shengbo Ye, and Guangyou Fang. "A Method for Reducing Timing Jitter’s Impact in Through-Wall Human Detection by Ultra-Wideband Impulse Radar." Remote Sensing 13, no. 18 (2021): 3577. http://dx.doi.org/10.3390/rs13183577.

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Ultra-wideband (UWB) impulse radar is widely used for through-wall human respiration detection due to its high range resolution and high penetration capability. UWB impulse radar emits very narrow time pulses, which can directly obtain the impulse response of the target. However, the time interval between successive pulses emitted is not ideally fixed because of timing jitter. This results in the impulse response position of the same target not being fixed, but it is related to slow-time. The clutter scattered by the stationary target becomes non-stationary clutter, which affects the accurate

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12

Xu, Qian. "Investigation of Stability Alarming for Retaining Wall Structures with Damage." Shock and Vibration 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/4691947.

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To warn of the stability of retaining wall structures with damage, a simplified mechanical model and a finite element model of this retaining wall-soil coupling system are established. Via finite element model updating, a baseline finite element model of the wall-soil system is acquired. A damage alarming index ERSD (Energy Ratio Standard Deviation) is proposed via the wavelet packet analysis of a virtual impulse response function of dynamic responses to this baseline finite element model. The internal relationships among the alarming index, earth pressure, and damage stability of the wall are

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13

Miller, A. Jared, Scott D. Sommerfeldt, Jonathan D. Blotter, and David C. Copley. "A hybrid method for creating auralizations of vibroacoustic systems." Noise Control Engineering Journal 70, no. 6 (2022): 552–61. http://dx.doi.org/10.3397/1/377048.

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A hybrid method for creating a unified broadband acoustic response from separate low-frequency and high-frequency simulation responses is proposed. This hybrid method is ideal for creating simple auralizable approximations of complex acoustic systems. The process consists of four steps: 1) creating separate low- frequency and high-frequency responses of the system of interest, 2) interpolating between the two responses to get a single broadband magnitude response, 3) introducing amplitude modulation to the high-frequency portion of the response, and 4) calculating approximate phase information

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14

Chrz, D., N. Maness, D. Chen, and M. Stone. "MECHANICAL IMPULSE RESPONSE AS A MEASURE OF TOMATO FRUIT MATURITY." HortScience 29, no. 7 (1994): 739g—739. http://dx.doi.org/10.21273/hortsci.29.7.739g.

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A mechanical impulse system for determining tomato fruit maturity and size was tested, for development of a rapid, nondestructive fruit testing instrument. Fruit were grouped into various maturity categories, ranging from immature green to red, and impulse spectra were obtained at a site over the locule at marked locations. Resistance to puncture was measured on the locular side of the pericarp wall at the same locations. A sonic resonant frequency band was weakly correlated with fruit maturity category. Stronger correlations existed with pericarp puncture resistance and fruit weight. A descri

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15

Zhou, Zou, Guoli Zhang, Fei Zheng, Tuyang Wang, Longjie Chen, and Nan Duan. "A Graph Optimization-Based Acoustic SLAM Edge Computing System Offering Centimeter-Level Mapping Services with Reflector Recognition Capability." Security and Communication Networks 2021 (December 3, 2021): 1–17. http://dx.doi.org/10.1155/2021/9126833.

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Robots can use echo signals for simultaneous localization and mapping (SLAM) services in unknown environments where its own camera is not available. In current acoustic SLAM solutions, the time of arrival (TOA) in the room impulse response (RIR) needs to be associated with the corresponding reflected wall, which leads to an echo labelling problem (ELP). The position of the wall can be derived from the TOA associated with the wall, but most of the current solutions ignore the effect of the cumulative error in the robot’s moving state measurement on the wall position estimation. In addition, the

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16

Parlin, Nicholas J., William G. Davids, Edwin Nagy, and Toney Cummins. "Dynamic response of lightweight wood-based flexible wall panels to blast and impulse loading." Construction and Building Materials 50 (January 2014): 237–45. http://dx.doi.org/10.1016/j.conbuildmat.2013.09.046.

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17

Dai, H. L., and X. Wang. "Non-Linear Dynamic Response of a Single Wall Carbon Nanotube Subjected to Radial Impulse." Archive of Applied Mechanics 76, no. 3-4 (2006): 145–58. http://dx.doi.org/10.1007/s00419-006-0011-2.

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18

Xu, Qian. "Investigation of Damage Diagnosis of Retaining Wall Structures Based on the Hilbert Damage Feature Vector Spectrum." Shock and Vibration 2019 (October 7, 2019): 1–22. http://dx.doi.org/10.1155/2019/3509470.

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To diagnose damages within the retaining wall structure, the Hilbert marginal energy spectrum was acquired via the Hilbert–Huang transformation of virtual impulse response functions of responses to the retaining wall under ambient excitations. Based on the Hilbert marginal energy spectrum, the Hilbert damage feature vector spectrum was created. On the basis of the damage feature vector spectrum, a damage identification index was proposed. Based on the damage feature vector spectrum and damage index, the damage state of the retaining wall was detected by the damage feature vector spectrum, dama

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19

ZENIT, R., and M. L. HUNT. "The impulsive motion of a liquid resulting from a particle collision." Journal of Fluid Mechanics 375 (November 25, 1998): 345–61. http://dx.doi.org/10.1017/s0022112098002596.

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When two particles collide in a liquid, the impulsive acceleration due to the rebound produces a pressure pulse that is transmitted through the fluid. Detailed measurements were made of the pressure pulse and the motion of the particles by generating controlled collisions with an immersed dual pendulum. The experiments were performed for a range of impact velocities, angles of incidence, and distances between the wall and the pairs of particles. The radiated fluid pressure was measured using a high-frequency-response pressure transducer, and the motion of the particles was recorded using a hig

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20

Sundaram, Prasannabalaji, Tapan K. Sengupta, and Swagata Bhaumik. "The three-dimensional impulse response of a boundary layer to different types of wall excitation." Physics of Fluids 30, no. 12 (2018): 124103. http://dx.doi.org/10.1063/1.5063700.

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21

Świerc, Agata, Stanisław Świerc, Henryk Foit, and Piotr Koper. "Applying the Exodus method to calculate the set of impulse response functions of a wall." Energy and Buildings 69 (February 2014): 301–6. http://dx.doi.org/10.1016/j.enbuild.2013.11.019.

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22

FUKUI, Hirohisa, Hideo FUJITANI, Yoichi MUKAI, Mai ITO, and Gilberto MOSQUEDA. "RESPONSE EVALUATION AND ANALYSIS USING IMPULSE OF BASE-ISOLATED BUILDINGS DURING A COLLISION WITH RETAINING WALL." Journal of Structural and Construction Engineering (Transactions of AIJ) 84, no. 766 (2019): 1533–43. http://dx.doi.org/10.3130/aijs.84.1533.

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23

Fukui, Hirohisa, Hideo Fujitani, Yoichi Mukai, Mai Ito, and Gilberto Mosqueda. "Response evaluation and analysis using impulse of base‐isolated buildings during a collision with retaining wall." JAPAN ARCHITECTURAL REVIEW 4, no. 1 (2020): 88–104. http://dx.doi.org/10.1002/2475-8876.12205.

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24

Prodeus, Arkadiy, and Maryna Didkovska. "Assessment of speech intelligibility in university lecture rooms of different sizes using objective and subjective methods." Eastern-European Journal of Enterprise Technologies 3, no. 5 (111) (2021): 47–56. http://dx.doi.org/10.15587/1729-4061.2021.228405.

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The scores of speech intelligibility, obtained using objective and subjective methods for three university lecture rooms of the small, medium, and large sizes with different degrees of filling, were presented. The problem of achieving high speech intelligibility is relevant for both students and university administration, and for architects designing or reconstructing lecture rooms. Speech intelligibility was assessed using binaural room impulse responses which applied an artificial head and non-professional quality audio equipment for measuring. The Speech Transmission Index was an objective

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25

Limarchenko, O., O. Nefedov, and O. Sirenko. "VERIFICATION OF THE CONTROL ALGORITHM FOR RESERVOIRS WITH LIQUID BASED ON THE COMPENSATION OF THE FORCE RESPONSE IN DIFFERENT RANGES OF MANIFESTATION OF NONLINEARITIES." Bulletin Taras Shevchenko National University of Kyiv. Mathematics Mechanics, no. 1 (41) (2020): 51–56. http://dx.doi.org/10.17721/1684-1565.2020.01-41.12.51-56.

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Problem about motion of a reservoir with liquid with a free surface is considered based on the compensation of a force response of the liquid on reservoir walls. Such an approach is selected since usual methods of control of mechanical system motion are mostly intended for linear systems of relatively small dimension. However, models of dynamics of the combined motion of reservoirs with liquid are described with relatively high-dimensional nonlinear systems ordinary differential equations. For obtaining the mathematical model of combined motion of a reservoir with liquid with a free surface we

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26

Xu, Qian. "Damage Identification of Wind-Break Wall Structures based on the Further Updated Wavelet Packet Frequency Bands Energy Ratio Spectrum." Shock and Vibration 2022 (July 19, 2022): 1–15. http://dx.doi.org/10.1155/2022/8200199.

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Damage will appear in the wind-break wall under the effects of many factors. The wind-break wall may be destroyed when the damage is accumulated to some extent, which may cause accidents. To identify damage within the wind-break wall structure, the Wavelet Packet frequency bands energy ratio spectrum analysis of the virtual impulse response function of responses to the wind-break wall was performed under the effects of excitation. Based on the damage sensitivity analysis of subfrequency bands, a further updated Wavelet Packet frequency bands energy ratio spectrum was proposed. To reflect the d

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27

Wang, Lei, Xiyue Ma, Rong Li, and Xiangyang Zeng. "Impact of Structural Parameters on the Auditory Perception of Musical Sounds in Closed Spaces: An Experimental Study." Applied Sciences 9, no. 7 (2019): 1416. http://dx.doi.org/10.3390/app9071416.

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This study attempts to investigate the impact of structural parameters (volume, shape, and the wall absorption coefficient) in closed space on the auditory perception of three different musical sound types. With binaural audibility technology and room impulse response measurement (RIR), this paper first verifies the reliability of using ODEON software in simulating simplified closed-space auditory scenes. Then, 96 music binaural signals produced in eight simulated closed spaces with different structural parameters are synthesized. Finally, auditory perception experiment is conducted on the syn

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28

Suo, Lisheng, and E. B. Wylie. "Complex Wavespeed and Hydraulic Transients in Viscoelastic Pipes." Journal of Fluids Engineering 112, no. 4 (1990): 496–500. http://dx.doi.org/10.1115/1.2909434.

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The classic formula for waterhammer wavespeed is extended to calculate the complex-valued, frequency-dependent wavespeed in a viscoelastic pipe, which takes into account the effect of viscoelasticity of pipe wall material on wave propagation. With the complex wavespeed, the standard impedance or transfer matrix is directly used to analyze resonating conditions in systems including viscoelastic pipes, and the impulse response method presented previously by the authors is applied to compute nonperiodic transients. Numerical results are compared with experimental data and good agreement is observ

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29

Li, Xin, Shiqiang Li, Zhihua Wang, Jinglei Yang, and Guiying Wu. "Response of aluminum corrugated sandwich panels under foam projectile impact – Experiment and numerical simulation." Journal of Sandwich Structures & Materials 19, no. 5 (2016): 595–615. http://dx.doi.org/10.1177/1099636216630503.

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The paper studied the dynamic response of square aluminum corrugated sandwich panels under projectile impact. The aluminum foam projectile was utilized to apply the impulse on the sandwich panels. In order to increase the applied impulse under controlled impact velocity ( V < 200 m/s), a cylindrical Nylon mass was adhered to the back of foam projectile. Corrugated sandwich panels with two different configurations were tested and their typical deformation modes were obtained in the experiment. Based on the experiment, corresponding numerical simulations were presented. The energy absorption

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30

Soheyli, Mohamad Reza, A. H. Akhaveissy, and S. M. Mirhosseini. "Large-Scale Experimental and Numerical Study of Blast Acceleration Created by Close-In Buried Explosion on Underground Tunnel Lining." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8918050.

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Despite growing demands for structures in water transportation tunnels, underground installations, subsurface dams, and subterranean channels, there is limited field knowledge about the dynamic behavior of these structures in the face of near-fault earthquakes or impulse excitations. This study conducted a large-scale test on underground tunnel excited by two close-in subsurface explosions. The horizontal and vertical acceleration were recorded on the vertical wall of the tunnel and the free field data including the acceleration on the ground surface at 11-meter distance from the tunnel. The f

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31

Sumala, M., B. Murali Krishna, and T. P. Tezeswi. "Structural Performance of EPS Core Based Cementitious Sandwich Panel under Various Loading Conditions." Journal of Physics: Conference Series 2779, no. 1 (2024): 012073. http://dx.doi.org/10.1088/1742-6596/2779/1/012073.

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Abstract Sandwich panels have gained a lot of popularity in recent years as engineers seek to replace the heavy, rigid constructions with the light weight structures that permit good energy absorption and deformation values. Expanded Polystyrene (EPS) core based cementitious sandwich composite panels are used as load bearing and non-load bearing panels. This EPS panel is a light weight, thermal efficient and reduces the cost of construction. This panel consists of upper and lower face skin and a core layer is sandwiched between the two face layers. In this paper the material for face skin used

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32

Zhao, Futian, Jun Liu, Zhimin Xiao, et al. "A Simplified Analytical Solution of Mechanical Responses of Soil Subjected to Repeated Impact Loading." Mathematical Problems in Engineering 2020 (November 4, 2020): 1–10. http://dx.doi.org/10.1155/2020/6920535.

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A simplified dynamic response model is proposed based on the deformation and dynamic stress response characteristics of soil under impact loading. The foundation is divided into two distinct zones: a projection cylinder acting vertically under impact loading and a hollow cylinder outside the projection area. It is assumed that the ramming deformation of the projected cylinder under the vertical impact load is a quasi-static loading process under the maximum contact dynamic stress through the quasi-static method, and the settlement calculation without lateral deformation is given. It is assumed

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Debski, E. A., and W. O. Friesen. "Role of central interneurons in habituation of swimming activity in the medicinal leech." Journal of Neurophysiology 55, no. 5 (1986): 977–94. http://dx.doi.org/10.1152/jn.1986.55.5.977.

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Swimming activity evoked by light tactile stimulation of a body wall flap in dissected leech preparations undergoes habituation (5). In this study, we examine the activity of several interneurons (cell 204, cell 205, the S cell, and cell 208) during habituation trials to study further the neuronal mechanisms that mediate this decline in responsiveness. Light tactile stimulation of the leech body wall evoked initially a marked excitatory response in cell 204 homologs (segmental swim-initiating neurons) that preceded the initiation of swimming activity. This response decreased over the course of

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Žaliaduonytė-Pekšienė, Diana, Tomas Kazakevičius, Vytautas Zabiela, et al. "Changes of electrophysiological parameters in patients with atrial flutter." Medicina 43, no. 8 (2007): 614. http://dx.doi.org/10.3390/medicina43080078.

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Objectives. The aim of the study was to study some anatomic and electrophysiological features of the right atrium, related to the presence of atrial flutter. Materials and methods. A total 23 patients with type I atrial flutter and 22 patients without atrial flutter were studied. Right atrium size was assessed using echocardiography before intracardiac examination and radiofrequency ablation. Results. Effective refractory periods of coronary sinus, high right atrium, low right atrium were different comparing with the control group (P<0.05). A stimulus–response time between high right atrium

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van der Harten, Arthur W., and Matthew Azevedo. "Calibrating geometrical acoustics models of non-diffuse rooms." Journal of the Acoustical Society of America 152, no. 4 (2022): A210. http://dx.doi.org/10.1121/10.0016037.

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A case study is presented for the challenging case in which a conference room with a strongly non-diffuse impulse response is measured, and geometrical acoustics models are built and calibrated using two separate software packages simultaneously. Both software packages are able to reproduce the measured flutter echoes, although with surprising input scattering coefficients, particularly for parallel stainless steel wall finishes. Caution is advised concerning common assumptions about scattering coefficients for operable partitions. Furthermore, the authors suggest that benchmarking for acousti

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Zhang, Peiwen, Xin Li, Tao Jin, Zhihua Wang, and Longmao Zhao. "Dynamic response of circular metallic sandwich panels under projectile impact." Journal of Sandwich Structures & Materials 19, no. 5 (2016): 572–94. http://dx.doi.org/10.1177/1099636215626596.

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The dynamic response of circular sandwich panels with aluminium honeycomb and corrugated cores under projectile impact was investigated experimentally and numerically. Impulse loaded on the panel was controlled by projectile launching velocity and the deformation process of sandwich panels was recorded by a high-speed camera in the experiments. Typical deformation/failure modes of face-sheets and cores were obtained and analysed. The back face-sheet deflections and strain histories of face-sheets were measured and discussed. A parametric study was conducted by LS-DYNA 3D to analyse the effect

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Kienzler, R. "Non-linear dynamic response of a single wall carbon nonotube subjected to radial impulse (by H.L. Dai; X. Wang)." Archive of Applied Mechanics 78, no. 5 (2008): 409. http://dx.doi.org/10.1007/s00419-007-0199-9.

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Russo, S., and P. Luchini. "The linear response of turbulent flow to a volume force: comparison between eddy-viscosity model and DNS." Journal of Fluid Mechanics 790 (February 2, 2016): 104–27. http://dx.doi.org/10.1017/jfm.2016.4.

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We identify a benchmark problem simple enough that it can be solved both by an eddy-viscosity model and by direct numerical simulation: this is the linear response of a turbulent flow’s mean-velocity profile to an external volume force. An example of such a force was found in a study of the perturbation induced by bottom topography by Luchini & Charru (J. Fluid Mech., vol. 656, 2010, pp. 337–341). On the other hand, a modification of the method by Quadrio & Luchini (Proceedings of the IX European Turbulence Conference, Southampton, UK, 2002, pp. 715–718) and Luchini et al. (Phys. Fluid

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Mander, Thomas J., and Zachery I. Smith. "Composite Steel Stud Blast Panel Design and Experimental Testing." Applied Mechanics and Materials 82 (July 2011): 479–84. http://dx.doi.org/10.4028/www.scientific.net/amm.82.479.

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Based on Federal Aviation Authority (FAA) requirements, project specific blast loads are determined for the design of a new airport traffic control tower. These blast loads must be resisted by exterior wall panels on the control tower, protecting building occupants from intentional explosives attack scenarios. Such blast resistant walls are typically constructed of thick reinforced concrete panels or composite steel plate and rolled sections, as conventional building cladding systems have relatively low blast resistance. While these more robust design approaches are valid, the additional cladd

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King, Richard, Wieslaw Woszczyk, and Michail Oikonomidis. "Enhancement of virtual acoustics rendering using boundary mounted dipole loudspeakers." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A177. http://dx.doi.org/10.1121/10.0027228.

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The Immersive Media Lab at McGill University hosts a Virtual Acoustics Technology (VAT) system incorporating a suspended array of omnidirectional loudspeakers. Using a convolution reverb engine, acoustic simulations of real spaces can be realized via a catalog of Room Impulse Response measurements. Reflected sound in the room helps to disguise the location of the sound emitters rendering virtual acoustics. One limitation of the system, however, is the interference between the lab’s natural acoustics and the virtual environment generated by the VAT system. The improvement under consideration is

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Swerdlow, Andy. "A modern metric for acoustic clarity in critical listening environments." Journal of the Acoustical Society of America 152, no. 4 (2022): A104. http://dx.doi.org/10.1121/10.0015690.

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Characteristics of acoustics in small rooms have become less mysterious, more predictable and measurements more common than in past decades. Modern metrics for characterizing the acoustical performance of critical listening environments have not followed the recent predictive improvements. An Acoustic Clarity metric with a variable time window (Rear Reflection Clarity, CRR) is proposed for small (under approximately 200m3) critical listening environments such as recording studio control, mastering, film post, screening, audiophile listening, and similar rooms. The variable time window is defin

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EDVALDSSON, Garðar, and Achilleas XYDIS. "Latency-free real-time auralisation in hemi-anechoic chambers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 3 (2024): 8120–27. http://dx.doi.org/10.3397/in_2024_4049.

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Real-time auralisation allows users to interact with a simulated acoustical room, providing a more responsive way of evaluating acoustical performance than pre- recorded auralisation. Nevertheless, real-time auralisation is computationally intensive and, therefore, susceptible to latency. This paper presents a novel latency-free real-time auralisation method that enables users to auralise a simulated acoustical event with self-excitation more accurately than current methods. The method uses a loudspeaker system inside a hemi-anechoic chamber. By exploiting the inherent floor reflection of the

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Kiran, K. K., and JagadishG Kori. "Blast Mitigation of SDOF systems by using M.R.Damper and Base Isolations." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (2022): 1095–100. http://dx.doi.org/10.38208/acp.v1.626.

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Shelter is a basic need for living creatures. The shelter should be safe and secure. The damage of the shelter occurs due to natural hazards and manmade activities. Natural hazards such as earthquake, volcanic eruptions, landslides, flood, etc. Manmade activities may be accidental or intentional. Accidental activities include, internal explosions such as chemical reactions occurring at nuclear power plants, mining, rock cutting etc, gas explosions leakage etc. Hence while designing the structure, additional precautions and considerations should be taken to resist the unpredictable load. Boat l

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Jacobi, I., and B. J. McKeon. "Dynamic roughness perturbation of a turbulent boundary layer." Journal of Fluid Mechanics 688 (October 27, 2011): 258–96. http://dx.doi.org/10.1017/jfm.2011.375.

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AbstractThe zero-pressure-gradient turbulent boundary layer over a flat plate was perturbed by a temporally oscillating, spatial impulse of roughness, and the downstream response of the flow field was interrogated by hot-wire anemometry and particle-image velocimetry. The key features common to impulsively perturbed boundary layers, as identified in Jacobi & McKeon (J. Fluid Mech., 2011), were investigated, and the unique contributions of the dynamic perturbation were isolated by contrast with an appropriately matched static impulse of roughness. In addition, the dynamic perturbation was d

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Eissa, Tahra L., Catherine A. Schevon, Ronald G. Emerson, Guy M. Mckhann, Robert R. Goodman, and Wim Van Drongelen. "The Relationship Between Ictal Multi-Unit Activity and the Electrocorticogram." International Journal of Neural Systems 28, no. 10 (2018): 1850027. http://dx.doi.org/10.1142/s0129065718500272.

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During neocortical seizures in patients with epilepsy, microelectrode array recordings from the ictal core show a strong correlation between the fast, cellular spiking activities and the low-frequency component of the potential field, reflected in the electrocorticogram (ECoG). Here, we model the relationship between the cellular spike activity and this low-frequency component as the input and output signals of a linear time invariant system. Our approach is based on the observation that this relationship can be characterized by a so-called sinc function, the unit impulse response of an ideal

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JACOBI, I., and B. J. McKEON. "New perspectives on the impulsive roughness-perturbation of a turbulent boundary layer." Journal of Fluid Mechanics 677 (April 26, 2011): 179–203. http://dx.doi.org/10.1017/jfm.2011.75.

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The zero-pressure-gradient turbulent boundary layer over a flat plate was perturbed by a short strip of two-dimensional roughness elements, and the downstream response of the flow field was interrogated by hot-wire anemometry and particle image velocimetry. Two internal layers, marking the two transitions between rough and smooth boundary conditions, are shown to represent the edges of a ‘stress bore’ in the flow field. New scalings, based on the mean velocity gradient and the third moment of the streamwise fluctuating velocity component, are used to identify this ‘stress bore’ as the region o

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Huang, Ling, Dong Lei, Bowen Zheng, Guiping Chen, Huifeng An, and Mingxuan Li. "Lightweight Multi-Domain Fusion Model for Through-Wall Human Activity Recognition Using IR-UWB Radar." Applied Sciences 14, no. 20 (2024): 9522. http://dx.doi.org/10.3390/app14209522.

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Impulse radio ultra-wideband (IR-UWB) radar, operating in the low-frequency band, can penetrate walls and utilize its high range resolution to recognize different human activities. Complex deep neural networks have demonstrated significant performance advantages in classifying radar spectrograms of various actions, but at the cost of a substantial computational overhead. In response, this paper proposes a lightweight model named TG2-CAFNet. First, clutter suppression and time–frequency analysis are used to obtain range–time and micro-Doppler feature maps of human activities. Then, leveraging G

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Chen, Suwen, Chen-Guang Zhu, Guo-Qiang Li, and Yong Lu. "Blast test and numerical simulation of point-supported glazing." Advances in Structural Engineering 19, no. 12 (2016): 1841–54. http://dx.doi.org/10.1177/1369433216649387.

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The blast resistance of point-supported laminated glass curtain wall has been investigated by means of field blast tests and numerical simulation. Nine site blast tests were carried out, considering two types of glass thickness and six TNT charges ranging from 0.4 to 30 kg. The overpressure and displacement time histories were measured and the failure modes were observed. The overpressure obtained from the measurement panel exhibited a typical pattern of near-field blast with a steep increase followed by a rapid decay within a few milliseconds. The displacement response of the laminated glass

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Petojević, Zorana, Radovan Gospavić, and Goran Todorović. "Estimation of thermal impulse response of a multi-layer building wall through in-situ experimental measurements in a dynamic regime with applications." Applied Energy 228 (October 2018): 468–86. http://dx.doi.org/10.1016/j.apenergy.2018.06.083.

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HOWE, M. S. "Edge, cavity and aperture tones at very low Mach numbers." Journal of Fluid Mechanics 330 (January 10, 1997): 61–84. http://dx.doi.org/10.1017/s0022112096003606.

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This paper discusses self-sustaining oscillations of high-Reynolds-number shear layers and jets incident on edges and corners at infinitesimal Mach number. These oscillations are frequently sources of narrow-band sound, and are usually attributed to the formation of discrete vortices whose interactions with the edge or corner produce impulsive pressures that lead to the formation of new vorticity and complete a feedback cycle of operation. Linearized analyses of these interactions are presented in which free shear layers are modelled by vortex sheets. Detailed results are given for shear flows

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