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Journal articles on the topic 'Sound and Vibration'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 June 2024

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1

Li, Mengmeng, and Jian Kang. "Influence of Leaf Physical Properties on Single-Leaf Vibrational Response to Sound." Forests 11, no. 1 (2020): 115. http://dx.doi.org/10.3390/f11010115.

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Plant leaves respond to environmental sounds by vibration. This study aimed to examine such responses by evaluating the influences of physical properties on vibrational amplitude, velocity and frequency before and during sound stimulation. Nine plant species with a wide range of leaf sizes, qualities and thicknesses and petiole lengths, widths and thicknesses were selected. In the absence of external sound, the leaf amplitude was ~1 μm, the vibrational velocity was ~0.05 mm s-1 and the vibrational frequency was ~0–15 Hz. After sound stimulation, however, the amplitude increased by 1–5.4×, the

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Dolezal, Franz, Andreas Reichenauer, Armin Wilfling, Maximilian Neusser, and Rok Prislan. "Recording, Processing, and Reproduction of Vibrations Produced by Impact Noise Sources in Buildings." Acoustics 6, no. 1 (2024): 97–113. http://dx.doi.org/10.3390/acoustics6010006.

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Several studies on the perception of impact sounds question the correlation of standardized approaches with perceived annoyance, while more recent studies have come to inconsistent conclusions. All these studies neglected the aspect of whole-body vibrations, which are known to be relevant for the perception of low-frequency sound and can be perceived especially in lightweight constructions. Basically, the contribution of vibrations to impact sound annoyance is still unknown and could be the reason for the contradictory results. To investigate this aspect, we measured vibrations on different ty

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3

Fujimoto, Takuya. "Loudness of Structure-Borne Sound Heard Directly by Ear Put on Vibrating Structure." Journal of Low Frequency Noise, Vibration and Active Control 22, no. 1 (2003): 27–32. http://dx.doi.org/10.1260/026309203769018068.

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Putting an ear close to a vibrating structure like a wall or a floor, we are able to hear structure-borne sounds clearly, but the loudness of such sounds has never been studied quantitatively. In this study, subjective experiments were carried out in order to obtain the relationship between loudness and the vibration amplitude of the ear's contact surface at low audible frequencies. The main result of this study is that the loudness of a structure-borne sound is almost equal to that of an air-borne sound with a sound pressure level 20 dB higher than the vibration velocity level (ref=5×10−8 m/s

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Ma, Li, and Li Cheng. "Vibration and sound radiation of an acoustic black hole plate immersed in heavy fluid." Journal of the Acoustical Society of America 154, no. 1 (2023): 179–90. http://dx.doi.org/10.1121/10.0020067.

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Vibrational acoustic black holes (ABHs) have shown great promise for reducing structural vibrations and sound radiation in light fluids. However, it is still unknown whether the acoustic black hole (ABH) effect can be materialized in heavy fluids. This paper discusses this issue by developing a semi-analytical model on a simply supported ABH plate that vibrates and radiates sound into water. The proposed model is validated by finite element models and used to investigate the vibration and sound radiation properties of the ABH plate in different frequency ranges. The results show that the ABH e

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Saurabh Tiwari. "Sound/Vibration: Reason of the Universe." Knowledgeable Research: A Multidisciplinary Journal 1, no. 11 (2023): 1–4. http://dx.doi.org/10.57067/kr.v1i11.93.

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It seems to us that we are thinking positively when we consider the cosmos. The field of thought and study is both intriguing and encouraging. When one is contemplating the nature of the cosmos, there is a significant chance that they may lose someone. Why is there a universe? What underlies the universe's primary purpose? We also need to consider sound and vibration. We should all be aware that creativity exists wherever there is resonance. Sound is the most potent thing because it has so much power. When specific circumstances are met, a vibrating item produces sound, which may clearly be se

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H. R., Iswono, Eko Kuncoro, and Imam Ashar. "RANCANG BANGUN ALAT PENDETEKSI SUARA, GETARAN DAN IMAGE TANK MENGGUNAKAN ARTIFICIAL NEURAL NETWORK." JASIEK (Jurnal Aplikasi Sains, Informasi, Elektronika dan Komputer) 3, no. 1 (2021): 21–34. http://dx.doi.org/10.26905/jasiek.v3i1.3956.

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In this study, the created tool uses a camera to capture images of the tanks that will be detected and uses sound and vibration sensors to collect data on vibrations and sounds caused by objects, which will later be displayed in the visualization application. Based on the description that has been explained about the benefits of using radar and research related to the implementation of radar that can be developed in the military world, namely the development of sound, vibration and image detection equipment using artificial neural networks.

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Li, Zhantao, Sui Wang, Jicheng Wang, Chunxia Song, and Bin Chen. "Study on the Effect of Mineral Particle Sizes on the Spectral Characteristics of Sound and Vibrations in Rock Drilling." Shock and Vibration 2020 (June 30, 2020): 1–15. http://dx.doi.org/10.1155/2020/9036371.

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This study aimed to investigate the relationships between particle sizes and spectral characteristics of the sound or vibration signals generated in rock drilling processes. Several drilling experiments were conducted on concrete specimens of different aggregate sizes. By using an indoor signal acquisition and analysis system, data from the sound waves and vibrations were collected, the characteristic signals were extracted, and the spectral characteristics of the sound and vibrations of different aggregate sizes were identified. An approach based on frequency band analysis was adopted. In thi

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Guo, Zhong Ning, X. Z. Huang, Zhi Gang Huang, Z. Q. Yu, T. M. Yue, and Wing Bun Lee. "Experimental Research on Ultra-Smooth Surface Polishing Based on Two-Dimensional Vibration of Liquid." Key Engineering Materials 329 (January 2007): 219–24. http://dx.doi.org/10.4028/www.scientific.net/kem.329.219.

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Experiment research of polishing based on liquid two-dimension vibration is carried out by a vibrating device which is driven by ultrasonic source and can produce coupling vibrations of liquid. Sound pressures of some key points in water are tested by hydrophone and translated into sound intensity to evaluate the effect of input voltage of transducer. It is analyzed which vibration state of fluid field and the way that workpiece is clamped is the best for the polishing. Polishing results of quartz glass are evaluated by the use of region-track measure method, and some polishing rules are prese

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Suzuki, Ryoichi, Kazuma Hoshi, and Toshiki Hanyu. "Estimating the characteristic vibrations of a sound field in a room using coefficient of variation in the power spectrum of a decay-cancelled impulse response." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 3 (2023): 5975–79. http://dx.doi.org/10.3397/in_2023_0869.

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Estimating the characteristic vibration distribution of a room sound field is difficult because the half-power bandwidth of the characteristic vibrations broadens due to room impulse response decay. Therefore, a coefficient of variation in a power spectrum of a decay-cancelled impulse response is proposed for estimating the characteristic vibrations of a room sound field. In the decay-cancelled impulse response, only the decay of the impulse response is cancelled. Cancelling the decay narrows the half-power bandwidth, thus enabling a clearer estimation of the characteristic vibration even in a

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Zhao, Ming Hui. "Vibration Analysis of a Shell Structure by Finite Element Method." Advanced Materials Research 591-593 (November 2012): 1929–33. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1929.

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Plate-shell structures, especially cylindrical shells and spherical shells, are widely used in engineering fields, such as aircraft and tanks, missiles, submarines, ships, hydraulic pumps, infusion pipelines and gas pipelines, and so on. These structures are usually in a fluid medium, which are related to the structure fluid-solid coupling and acoustic radiation field. As many experiments show that enclosed air in a thin walled structure, just like the violin, affects some modes of vibration significantly, air coupling between vibrating sides of the structure cannot be neglected. In order to e

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11

Le Bot, A. "Entropy in sound and vibration: towards a new paradigm." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2197 (2017): 20160602. http://dx.doi.org/10.1098/rspa.2016.0602.

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This paper describes a discussion on the method and the status of a statistical theory of sound and vibration, called statistical energy analysis (SEA). SEA is a simple theory of sound and vibration in elastic structures that applies when the vibrational energy is diffusely distributed. We show that SEA is a thermodynamical theory of sound and vibration, based on a law of exchange of energy analogous to the Clausius principle. We further investigate the notion of entropy in this context and discuss its meaning. We show that entropy is a measure of information lost in the passage from the class

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Capshaw, G., D. Soares, J. Christensen-Dalsgaard, and C. E. Carr. "Seismic sensitivity and bone conduction mechanisms enable extratympanic hearing in salamanders." Journal of Experimental Biology 223, no. 24 (2020): jeb236489. http://dx.doi.org/10.1242/jeb.236489.

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ABSTRACTThe tympanic middle ear is an adaptive sensory novelty that evolved multiple times in all the major terrestrial tetrapod groups to overcome the impedance mismatch generated when aerial sound encounters the air–skin boundary. Many extant tetrapod species have lost their tympanic middle ears, yet they retain the ability to detect airborne sound. In the absence of a functional tympanic ear, extratympanic hearing may occur via the resonant qualities of air-filled body cavities, sensitivity to seismic vibration, and/or bone conduction pathways to transmit sound from the environment to the e

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Koppelberg, Jan, Lukas Stuhldreier, Robin Liegert, Niklas Lehrmann, and Peter Jeschke. "Evaluation of noise emissions of a ducted fan on a test rig." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 7 (2023): 1983–94. http://dx.doi.org/10.3397/in_2023_0296.

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This paper presents an experimental research study on the sound excitation of a ducted fan designed for low-noise emissions. In particular, the influence of test rig vibrations as a significant systematic error when evaluating the noise emissions of ducted fans is discussed. A propulsor test rig was used to measure the sound emitted by a ducted fan. Significantly increased sound levels are ascertained at specific frequencies. The corresponding sources are often unexpectedly identified at the casing and structure of the rig using a sound source localization. By comparing sound pressures against

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14

Wang, Chuyu, Lei Xie, Yuancan Lin, et al. "Thru-the-wall Eavesdropping on Loudspeakers via RFID by Capturing Sub-mm Level Vibration." Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 5, no. 4 (2021): 1–25. http://dx.doi.org/10.1145/3494975.

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The unprecedented success of speech recognition methods has stimulated the wide usage of intelligent audio systems, which provides new attack opportunities for stealing the user privacy through eavesdropping on the loudspeakers. Effective eavesdropping methods employ a high-speed camera, relying on LOS to measure object vibrations, or utilize WiFi MIMO antenna array, requiring to eavesdrop in quiet environments. In this paper, we explore the possibility of eavesdropping on the loudspeaker based on COTS RFID tags, which are prevalently deployed in many corners of our daily lives. We propose Tag

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15

Seong, Daewoon, Jaehwan Kwon, Deokmin Jeon, et al. "In Situ Characterization of Micro-Vibration in Natural Latex Membrane Resembling Tympanic Membrane Functionally Using Optical Doppler Tomography." Sensors 20, no. 1 (2019): 64. http://dx.doi.org/10.3390/s20010064.

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Non-invasive characterization of micro-vibrations in the tympanic membrane (TM) excited by external sound waves is considered as a promising and essential diagnosis in modern otolaryngology. To verify the possibility of measuring and discriminating the vibrating pattern of TM, here we describe a micro-vibration measurement method of latex membrane resembling the TM. The measurements are obtained with an externally generated audio stimuli of 2.0, 2.2, 2.8, 3.1 and 3.2 kHz, and their respective vibrations based tomographic, volumetric and quantitative evaluations were acquired using optical Dopp

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16

Lee, Yiu-Yin. "Analytic Formula for the Vibration and Sound Radiation of a Nonlinear Duct." Shock and Vibration 2019 (April 28, 2019): 1–12. http://dx.doi.org/10.1155/2019/9685142.

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This paper addresses the vibration and sound radiation of a nonlinear duct. Many related works assume that the boundaries are linearly vibrating (i.e., their vibration amplitudes are small), or that the duct panels are rigid, and their vibrations can thus be neglected. A classic method combined with Vieta’s substitution technique is adopted to develop an analytic formula for computing the nonlinear structural and acoustic responses. The development of the analytic formula is based on the classical nonlinear thin plate theory and the three-dimensional wave equation. The main advantage of the an

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17

Lee, Yiu-Yin. "Chaotic Vibration and Perforation Effects on the Sound Absorption of a Nonlinear Curved Panel Absorber." Mathematics 11, no. 14 (2023): 3178. http://dx.doi.org/10.3390/math11143178.

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This study is the first to investigate the effect of chaotic vibration on the sound absorption of a curved perforated panel. Previous studies on the effect of nonlinear vibration on the sound absorption of a panel absorber have focused on periodic responses only. In this study, a sound absorption formula was derived by considering the panel impedance and perforation impedance. The numerical integration method was adopted to generate various chaotic vibrational responses, which were used to compute the corresponding sound absorptions. Several interesting findings that have never been observed i

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18

Chocholaty, Bettina, Nicolaas Bernardus Roozen, Karl-Alexander Hoppe, Marcus Maeder, and Steffen Marburg. "Vibration and impact sound properties of hybrid steel-timber floor structures." Acta Acustica 8 (2024): 11. http://dx.doi.org/10.1051/aacus/2024001.

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Lightweight floor structures, such as timber or hybrid timber floors, face challenges associated with excessive vibrations and elevated levels of low-frequency impact sound. Especially here, accurate prediction of a floor’s vibration and acoustic behavior is essential. However, typical laboratory testing of building elements is costly and time-consuming. To reduce costs, in this study, adapted simulations are carried out on two types of hybrid steel-timber floor structures to evaluate vibrations and impact sound. The hybrid elements are made of laminated veneer lumber as the top and bottom lay

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19

Mi, Jiachen, Zehang Zhao, Hongkai Wang, and Hong Tang. "Study of the Relationship between Pulmonary Artery Pressure and Heart Valve Vibration Sound Based on Mock Loop." Bioengineering 10, no. 8 (2023): 985. http://dx.doi.org/10.3390/bioengineering10080985.

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The vibration of the heart valves’ closure is an important component of the heart sound and contains important information about the mechanical activity of a heart. Stenosis of the distal pulmonary artery can lead to pulmonary hypertension (PH). Therefore, in this paper, the relationship between the vibration sound of heart valves and the pulmonary artery blood pressure was investigated to contribute to the noninvasive detection of PH. In this paper, a lumped parameter circuit platform of pulmonary circulation was first set to guide the establishment of a mock loop of circulation. By adjusting

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20

Beskopylny, Alexey, Alexander Chukarin, Besarion Meskhi, and Dmitrii Dzhedirov. "Experimental studies of noise and vibration during milling of cast iron parts." E3S Web of Conferences 383 (2023): 04082. http://dx.doi.org/10.1051/e3sconf/202338304082.

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Machining processes of cast iron parts are accompanied by significant noise and vibration. Exceeding the standard values of vibration and noise adversely affects the health of the operator and reduces the quality of the final product. The article deals with the scientific problem associated with the study of the causes of increased vibrations and noise during the milling of cast iron products. It has been experimentally shown that the existing ones create increased sound pressure in the range from 250 to 8000 Hz, while the sound pressure level reaches 80-92 dBa, which is 15-20 dBa higher than

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21

Hambric, Stephen. "Tutorial on vibration and sound." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A338. http://dx.doi.org/10.1121/10.0019070.

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Over the years I have written many tutorials on vibroacoustics. This tutorial summarizes much of the material in those articles, starting with structural flexural vibrations and how they radiate sound. I explain structural modes of vibration, how they sum into structural mobilities, and how to use infinite plate theory to estimate the means of those mobilities. I also show that as structural damping increases, the mobilities of finite structures converge to that of an infinite structure. Next, you will see how structural flexural waves radiate sound into adjacent acoustic spaces. The radiated

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22

Zhao, Guo Ming. "Vibration Characteristics of Violin Bow String and its Timbre Effect." Applied Mechanics and Materials 670-671 (October 2014): 1130–33. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.1130.

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This paper analyzes the modes of vibration of the strings and the strings of the material, the thickness effect on pronunciation, the establishment of a mass-spring model of vibrating strings and studied when the force pulling the strings and plucked violins panel vibration. Spectrum analysis and processing by MATLAB, the vibration of the resonance box is directly converted into sound, a sound judgment using spectral analysis methods.

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Solomos, Makis. "From Sound to Sound Space, Sound Environment, Soundscape, Sound Milieu or Ambiance …" Paragraph 41, no. 1 (2018): 95–109. http://dx.doi.org/10.3366/para.2018.0253.

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This article proposes approaching the phenomenon of sound as a fabric of relationships. Critiquing the notion of a sound object as it has become defined thanks to the fixity enabled by sound recording, it focuses on the characteristics of sound that converge towards a relational approach and suggests that there is an inextricable link between the vibrating object, the milieu in which the vibration spreads and the subject who listens. It is probably for this reason that current research — whether in music, sound art or other disciplines that centre on sound, from sound studies to environmental

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Dudykevych, Valery, Ivan Opirskyy, Nazariy Dzianyi, Larysa Rakobovchuk, and Petro Garanyuk. "RESEARCH OF OPTIMIZATION OF LAMES OF THE LASER SENSOR OF VIBRATION TO COUNTER LASER INTELLIGENCE SYSTEMS." Cybersecurity: Education, Science, Technique 3, no. 15 (2022): 110–23. http://dx.doi.org/10.28925/2663-4023.2022.15.110123.

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One of the most vulnerable issues in the technical protection of information is the receipt of data, private or confidential, due to leakage through the optoelectronic channel, the main source of data is laser acoustic intelligence systems or laser microphones. There are active and passive methods of protection against laser acoustic reconnaissance systems (ACS). Active methods use various noisy or vibrating devices that pose a danger to human health. With passive protection, it is recommended to use either special corrugated windows or completely closed shutters, which create some inconvenien

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25

Nirmalasari, Yohanna. "KESALAHAN BUNYI SIMAKAN PEMELAJAR BIPA TINGKAT PEMULA ASAL TIONGKOK." Tabasa: Jurnal Bahasa, Sastra Indonesia, dan Pengajarannya 1, no. 2 (2021): 147–64. http://dx.doi.org/10.22515/tabasa.v1i2.2692.

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Listening skills are language skills that affect the development of language learning, especially for second language learners. In the learning process of listening skills, mistakes often occur. This can happen because of the influence of the first language on the second language learning process. This study aims to describe the sound errors by observing beginner BIPA learners from China who do not use the alphabet in their first language. This research is a text analysis research which analyzes the sound errors by listening to BIPA students' writing. Based on the analysis that has been done,

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Abdullah, Nurfaezah, Kasrul Abdul Karim, Raja Nor Firdaus Raja Othman, Auzani Jidin, and Tole Sutikno. "Investigation on various stator structure towards noise and vibration." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 3 (2023): 1403. http://dx.doi.org/10.11591/ijpeds.v14.i3.pp1403-1413.

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<span lang="EN-US">This research analyses the noise and vibration characteristics of permanent magnet motors (PMM) with the electromagnetic characteristics, with an emphasis on high-speed motor segmented closed slot stator. The interaction between the stator, rotor, and magnets can cause a vibration that results in the loud sound due to the high magnetic energy. Even if there aren't many vibrations to contend with, the fluctuation of motor vibrations causes more serious harm. The studies covered slotted stator, closed slot stator, and segmented with closed slot stator. The objective is t

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Barros, Everaldo de, Carlos d'Andrade Souto, Leandro Ribeiro de Camargo, and Mauro Hugo Mathias. "Application of a computer sound card for measurement of mechanical vibrations." Revista Brasileira de Ensino de Física 37, no. 4 (2015): 4313–1. http://dx.doi.org/10.1590/s1806-11173742036.

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This paper presents a data acquisition and analysis system based on a computer sound card for measuring and processing random vibration signals. This system turns the computer into a two-channel measurement instrument which provides sample rate, simultaneous sampling, frequency range, filters and others essential capabilities required to perform random vibrations measurements. An easy-to-use software was developed for vibration monitoring and analysis, including facilities for data recording, digital signal processing and real time spectrum analyzer. Since the tasks of vibration data acquisiti

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Bartel, Lee, and Abdullah Mosabbir. "Possible Mechanisms for the Effects of Sound Vibration on Human Health." Healthcare 9, no. 5 (2021): 597. http://dx.doi.org/10.3390/healthcare9050597.

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This paper presents a narrative review of research literature to “map the landscape” of the mechanisms of the effect of sound vibration on humans including the physiological, neurological, and biochemical. It begins by narrowing music to sound and sound to vibration. The focus is on low frequency sound (up to 250 Hz) including infrasound (1–16 Hz). Types of application are described and include whole body vibration, vibroacoustics, and focal applications of vibration. Literature on mechanisms of response to vibration is categorized into hemodynamic, neurological, and musculoskeletal. Basic mec

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Casas, J., M. D. Greenfield, C. R. Lazzari, and J. Sueur. "Invertebrate sound and vibration." Journal of Experimental Biology 212, no. 24 (2009): 3935. http://dx.doi.org/10.1242/jeb.040113.

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Fan, Zijie. "Transient vibration and sound radiation of a rectangular plate with viscoelastic boundary supports." International Journal for Numerical Methods in Engineering 51, no. 5 (2001): 619–30. http://dx.doi.org/10.1002/nme.197.

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AbstractThis work considers transient vibration and sound radiation from an impact‐excited rectangular plate with viscoelastic boundary supports. The approach used is based on the modal strain energy (MSE) method. Vibration of the plate is approximated by a double infinite series in the spatial co‐ordinates. Each term of the series is constructed with vibration modes of beams having the same boundary conditions as the plate, multiplied by a time‐dependent function. Modal loss factor of each mode is obtained by the MSE method. The sound radiation pressure in the time and frequency domain is obt

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Kłosak, Andrzej, Alicja Kowalska-Koczwara, Filip Pachla, Krzysztof Stypuła, Tadeusz Tatara, and Bogusław Zając. "Proposal of new vibro-acoustic floor." MATEC Web of Conferences 211 (2018): 10001. http://dx.doi.org/10.1051/matecconf/201821110001.

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Human perception of vibration could be the basic parameter in designing a new buildings located close to public transport. It is also one of parameter that is considered in diagnosis of building vibration. People perceived vibrations through the floor. The problem of floor vibration appear especially in old historical buildings with wooden floor when source of transport vibration change because of infrastructure development. During years road, tramway or railway infrastructure is more expanded that it was when the old buildings were built. That is why new solutions of protection against noise

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Kovacic, Ivana, and Zeljko Kanovic. "Chladni Plate in Anechoic Chamber: Symmetry in Vibrational and Acoustic Response." Symmetry 15, no. 9 (2023): 1748. http://dx.doi.org/10.3390/sym15091748.

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A square metal plate (Chladni plate) is excited harmonically by a vibration shaker, while the whole system is set in an anechoic chamber to stop reflections, isolate the system from sound entering from the surroundings, and deal with direct sounds only. As far as the authors are aware, such an arrangement has not been achieved so far. Vibration modes are visualized by using poppy grains scattered over the upper surface of the plate and are also recorded by a camera located above it, inserted among the acoustic wedges on the roof of the chamber, which made it possible to record the patterns and

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Kurosawa, Yoshio, Ji Chengyao, Tsuyoshi Yamashita, et al. "FE analysis of porous material covers for automotive parts." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 5 (2023): 3260–66. http://dx.doi.org/10.3397/in_2023_0467.

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Some automobile transmissions (AT, CVT, etc.) generate noise, and a soundproof material cover is attached to the transmission body reduce the noise by offering sound absorption and insulation. However, the sound radiating from the cover may affect the transmission of vibrations. In this study, we attached a simply shaped cover to a jig to represent a transmission body and measured the vibration acceleration and sound pressure level when the jig was vibrated. The jig and cover were modeled by FEM, and vibroacoustic analysis was performed. The material of the cover was felt or grow wool, and sou

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Lee, Y. Y. "The Response Frequency Conversion Characteristic of a Nonlinear Curved Panel with a Centre Mass and the Sound Radiations." Mathematical Problems in Engineering 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/298413.

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This study investigates the response frequency conversion characteristic of a nonlinear curved panel mounted with a centre mass and the sound radiations. A set of coupled governing differential equations is set up and used to generate the nonlinear vibration responses, which are used to calculate the corresponding radiated sounds. The vibration, sound levels, and the ratio of the antisymmetrical to symmetrical mode responses are plotted against the excitation level and compared with a set of experimental data. The frequency conversion characteristic is investigated from the frequency spectrums

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Nosal, D., and E. Bilgery. "Airborne noise, structure-borne sound (vibration) and vacuum stability of milking systems." Czech Journal of Animal Science 49, No. 5 (2011): 226–30. http://dx.doi.org/10.17221/4304-cjas.

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Problems with milking and udder health can be attributed to the following causes: (1) sound intensity level (noise) &gt; 65 dB in the milking area, (2) transmission of oscillation (vibration) &gt; 0.3 m/s<sup>2 </sup>to the body of the cow in the milking parlour, (3) transmission of severe oscillation (vibration) into the vacuum system, (4) assembly and installation faults causing fluid flow problems and hence pressure fluctuations in the vacuum system. By combining technical alterations to a practical unit with the fitting of the Vibrations-schlucker<sup>&reg;&lt

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Zheng, Jing, Qingliang Li, Xiaozhen Li, and Yunke Luo. "Train-Induced Fluctuating Pressure and Resultant Dynamic Response of Semienclosed Sound Barriers." Shock and Vibration 2020 (September 22, 2020): 1–16. http://dx.doi.org/10.1155/2020/6901564.

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This paper reports on train-induced fluctuating pressure and consequent dynamic response of semienclosed sound barriers (SESBs), a novel type of sound barriers. A computational fluid dynamic (CFD) model and a finite element (FE) model were established. The in situ vibration measurement of the SESB was introduced for the first time. Pressure-induced vibrations were extracted from the measured results. The analyzing process of the pressure-induced vibration below 20 Hz is verified. Influencing factors of the pressure and vibrations, including train running on the near- or far-line and the length

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Maravich, Maria Mareen, Robert Rosenkranz, and M. Ercan Altinsoy. "Annoyance Caused by Simultaneous Noise and Vibration in Commercial Vehicles: Multimodal Interaction and the Effects of Sinusoidal Components in Recorded Seat Vibrations." Vibration 6, no. 3 (2023): 536–55. http://dx.doi.org/10.3390/vibration6030033.

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Noise and whole-body vibrations (WBV) inside commercial vehicles can lead to annoyance and reduced comfort. As a result, negative effects on the driver can occur even below the legal exposure limits. In order to understand the annoyance perception and the interaction between noise and WBV, two perception experiments were conducted. For both experiments, recorded signals inside different commercial vehicles were used. Sound pressure and acceleration levels varied. In addition, the frequency content of the recorded vertical seat vibrations was reproduced in different modified variants. The varie

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LEE, Jakin, and Chan-Hoon Haan. "Round-robin tests of the different types of sensors for floor impact sounds and vibrations." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A129. http://dx.doi.org/10.1121/10.0023014.

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Recently, floor impact noise monitoring system was introduced for residents to control making noises spontaneously using sound and vibration sensors. The present study aims to investigate the performance and characteristics of various current using sound and vibration sensors which can be eventually compatible with the floor impact noise monitoring system. For measurements of sound sensors, 7 sound microphones were used including 2 condenser types, 4 dynamic types, and 1 electro condenser type. Also, 6 vibration meters were used including 2 MEMS types, 2 Piezo types, and 2 spring types. Sound

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Malcoci, Iulian, and Ion Bodnariuc. "Vibroacoustical Diagnosis of Planetary Precessional Kinematical Transmission (Part 1)." Applied Mechanics and Materials 809-810 (November 2015): 593–97. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.593.

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An ideal dynamical system should not generate any vibrations, because vibrations mean a loss of energy. Vibration in planetary precessional gear box occurs at bearings, gear wheels, misaligned shafts, imbalance rotating parts, couplings. If damage occurs, not only the dynamic processes change, but also the forces that act on system components. Regarding this aspects, regular vibration measurements on machines provide information about any necessary maintenance. Vibration research was made by using GUNT PT500 Machinery Diagnostic System and vibration signals was evaluated by using GUNT PT500.04

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Qin, Hui, Xiling Xie, and Zhiyi Zhang. "Influence of electromagnetic bearings on lateral vibrations and sound radiation of a shaft-hull system." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, no. 1 (2019): 245–52. http://dx.doi.org/10.1177/1475090219837408.

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The fluctuating load of a propeller in the non-uniform wake field can excite the propulsion shafting system and further induce vibrations in the hull structure. In order to reduce transmission of lateral vibration from the shafting system to the hull, a new method using electromagnetic bearings is proposed. The feasibility of using active bearings in vibration and sound control is evaluated. A dynamic model of the shaft-hull system is established with the frequency response synthesis method at first and subsequently, the influence of the dynamic magnetic forces provided by the electromagnetic

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Matsuda, Hiroshi, and Nobuo Machida. "Experimental study on effects of sound on vibratory sensation of horizontal vibration." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 6 (2023): 2890–97. http://dx.doi.org/10.3397/in_2023_0419.

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Humans are exposed to both vibration and noise when riding in vehicles such as cars and trains. Therefore, an evaluation of the vibratory sensation based on the combined effect of vibration and noise is needed. This study aims to determine the effects of sound on whole-body vibratory sensations of horizontal vibration. In this study, we conducted two experiments to research the influence of sound on vibratory sensation using an electrodynamic vibration test machine. The first experiment measured the point of subjective equality of the magnitudes of vibration and sound, and the second experimen

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Russell, Daniel A. "Acoustics demonstration extravaganza." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A114. http://dx.doi.org/10.1121/10.0018346.

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The Education in Acoustics and Physical Acoustics committees are pleased to present an Acoustics Demonstration Extravaganza - a showcase of demonstrations and apparatus to inspire and challenge your understanding of acoustics and vibration phenomena. In the spirit of the “Circus of Acoustics” demonstration show from the June 2002 ASA 143 Pittsburgh meeting [J. Acoust. Soc., Am., 111, 5, Pt2, p. 2451, (2002) session 4pPAb] this session will consist of several short demonstrations covering a wide variety of acoustics and vibration topics. Among the demonstrations intended to be shown are the fol

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Christensen-Dalsgaard, Jakob, Christian Brandt, Maria Wilson, Magnus Wahlberg, and Peter T. Madsen. "Hearing in the African lungfish ( Protopterus annectens ): pre-adaptation to pressure hearing in tetrapods?" Biology Letters 7, no. 1 (2010): 139–41. http://dx.doi.org/10.1098/rsbl.2010.0636.

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Lungfishes are the closest living relatives of the tetrapods, and the ear of recent lungfishes resembles the tetrapod ear more than the ear of ray-finned fishes and is therefore of interest for understanding the evolution of hearing in the early tetrapods. The water-to-land transition resulted in major changes in the tetrapod ear associated with the detection of air-borne sound pressure, as evidenced by the late and independent origins of tympanic ears in all of the major tetrapod groups. To investigate lungfish pressure and vibration detection, we measured the sensitivity and frequency respon

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Iwanaga, Keiichiro, Tetsuya Doi, and Akira Omoto. "Active vibration control for window rattling caused by infrasound: Field experiment for one pair of sliding glass doors installed on the test building." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 2 (2023): 6935–43. http://dx.doi.org/10.3397/in_2023_1036.

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We developed an active vibration control system to reduce window vibration caused by infrasound since serious environmental noise problems such as window rattling have remained in Japan. In our previous study, we demonstrated the application of active noise control for the window vibration to reduce the transmitted sound into the room by using the low-frequency sound generator as the secondary source. However, active noise control using sound waves has the problem of increasing the sound pressure level in some areas outside the control window. Therefore, we developed an active vibration contro

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Singh, Sneha, Sagar Potala, and Amiya R. Mohanty. "An improved method of detecting engine misfire by sound quality metrics of radiated sound." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 12 (2018): 3112–24. http://dx.doi.org/10.1177/0954407018818693.

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Existing engine misfire detection techniques require direct contact with hot vibrating engine component(s). Thus, they need costly sensors and regular maintenance. To overcome this limitation, a novel method is proposed to detect cylinder misfire using sound quality metrics of the radiated sound, measured either near the cylinder block or near the exhaust tailpipe. This method was tested on a four-stroke, four-cylinder spark-ignition engine over a wide range of load torques and speeds. Sound signals were measured near the cylinder block and near the tailpipe. Vibration signals were measured on

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HAYASHI, Hirotsugu. "505 Frictional Vibration and Sound Vibration of Guitar." Proceedings of Conference of Kanto Branch 2001.7 (2001): 163–64. http://dx.doi.org/10.1299/jsmekanto.2001.7.163.

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Muthukumaran, P., R. B. Bhat, and I. Stiharu. "LOCALIZATION OF STRUCTURAL VIBRATION AND ACOUSTIC RADIATION THROUGH BOUNDARY CONDITIONING." Transactions of the Canadian Society for Mechanical Engineering 22, no. 4B (1998): 519–32. http://dx.doi.org/10.1139/tcsme-1998-0030.

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Structural response and the resulting sound radiation due to excitations applied at any point on the structure depend very strongly on the boundary condition. Constraining structural vibration to the local areas of interest and modifying vibrational behaviour of the entire structure have numerous application s in sound and vibration control engineering. A concept of boundary conditioning has been proposed here in order to manipulate and control the vibration behaviour of the structure. A plate structure has been analyzed for its response and numerical results demonstrate the localization of st

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Lu, Wei, Yu Lan, Rongzhen Guo, Qicheng Zhang, Shichang Li, and Tianfang Zhou. "Spiral Sound Wave Transducer Based on the Longitudinal Vibration." Sensors 18, no. 11 (2018): 3674. http://dx.doi.org/10.3390/s18113674.

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A spiral sound wave transducer comprised of longitudinal vibrating elements has been proposed. This transducer was made from eight uniform radial distributed longitudinal vibrating elements, which could effectively generate low frequency underwater acoustic spiral waves. We discuss the production theory of spiral sound waves, which could be synthesized by two orthogonal acoustic dipoles with a phase difference of 90 degrees. The excitation voltage distribution of the transducer for emitting a spiral sound wave and the measurement method for the transducer is given. Three-dimensional finite ele

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Jiang, Liying, Fan Lin, and Zubin Liu. "Vibration reconstruction for a point-excited plate based on acoustic radiation modes and sound pressure measurement." AIP Advances 12, no. 4 (2022): 045014. http://dx.doi.org/10.1063/5.0086294.

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The inverse problem of sound radiation from a vibrating structure is one of the key problems in vibro-acoustics; however, sound source reconstruction with sound pressure measurement still has challenges from sound field assumptions and measurement noise. Due to orthogonality and unrestricted source, Acoustic Radiation Modes (ARMs) are seen as promising basis vectors to realize sound source reconstruction. Here, near-field ARMs obtained by the pressure-velocity method were proposed to construct a series of orthogonal basis vectors for the vibration velocity of a point-excited rectangular plate,

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Ren, Tianying, Wenxuan He, and David Kemp. "Reticular lamina and basilar membrane vibrations in living mouse cochleae." Proceedings of the National Academy of Sciences 113, no. 35 (2016): 9910–15. http://dx.doi.org/10.1073/pnas.1607428113.

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It is commonly believed that the exceptional sensitivity of mammalian hearing depends on outer hair cells which generate forces for amplifying sound-induced basilar membrane vibrations, yet how cellular forces amplify vibrations is poorly understood. In this study, by measuring subnanometer vibrations directly from the reticular lamina at the apical ends of outer hair cells and from the basilar membrane using a custom-built heterodyne low-coherence interferometer, we demonstrate in living mouse cochleae that the sound-induced reticular lamina vibration is substantially larger than the basilar

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