A sensor for measuring low frequency surface vibration of a fluid loaded compliant structure

1996 ◽  
Author(s):  
Alan D. McCleary ◽  
Patrick J. Klippel ◽  
A. Mark Young ◽  
D. H. Trivett
Keyword(s):  
Low Frequency ◽  
Surface Vibration ◽  
Compliant Structure

scholarly journals A sensor for measuring low‐frequency surface vibration of a fluid‐loaded compliant structure

1994 ◽  
Vol 95 (5) ◽  
pp. 2995-2995
Author(s):  
Alan D. McClearly ◽  
A. Mark Young ◽  
Patrick J. Klippel ◽  
D. H. Trivett
Keyword(s):  
Low Frequency ◽  
Surface Vibration ◽  
Compliant Structure

scholarly journals The Relationship between Vibratory Sensation and Body Surface Vibration Induced by Low-Frequency Noise

2002 ◽  
Vol 21 (2) ◽  
pp. 87-100 ◽  
Author(s):  
Yukio Takahashi ◽  
Kazuo Kanada ◽  
Yoshiharu Yonekawa
Keyword(s):  
Body Surface ◽  
Mechanical Vibration ◽  
Low Frequency ◽  
The Body ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Vibration Acceleration ◽  
Surface Vibration ◽  
Human Body Surface ◽  
The Relationship

Human body surface vibration induced by low-frequency noise was measured at the forehead, the chest and the abdomen. At the same time, subjects rated their vibratory sensation at each of these locations. The relationship between the measured vibration on the body surface and the rated vibratory sensation was examined, revealing that the vibratory sensations perceived in the chest and abdomen correlated closely with the vibration acceleration levels of the body surface vibration. This suggested that a person exposed to low-frequency noise perceives vibration at the chest or abdomen by sensing the mechanical vibration that the noise induces in the body. At the head, on the other hand, it was found that the vibratory sensation correlated comparably with the vibration acceleration level of the body surface vibration and the sound pressure level of the noise stimulus. This finding suggested that the mechanism of perception of vibration in the head is different from that of the perception of vibratory sensation in the chest and the abdomen.

Some characteristics of human body surface vibration induced by low frequency noise

Noise Notes ◽  
2003 ◽  
Vol 2 (2) ◽  
pp. 19-28
Author(s):  
Yukio Takahashi ◽  
Kazuo Kanada ◽  
Yoshiharu Yonekawa
Keyword(s):  
Body Surface ◽  
Human Body ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Surface Vibration ◽  
Human Body Surface

Comparative Feature Analysis of Ground Surface Vibration Induced by High-Speed Train Running on Viaduct and Embankment

2014 ◽  
Vol 638-640 ◽  
pp. 1229-1232
Author(s):  
Kun Ming Mao ◽  
Ting Ting Wang ◽  
Qian Wen Ru ◽  
Yan Li
Keyword(s):  
Frequency Band ◽  
High Frequency ◽  
High Speed ◽  
Fourier Spectrum ◽  
Three Dimensional ◽  
Low Frequency ◽  
Ground Surface ◽  
Vertical Acceleration ◽  
High Frequency Band ◽  
Surface Vibration

Based on the Abaqus parallel computing cluster system platform, the three-dimensional finite element model of train-track-viaduct/embankment-foundation-soil coupling is established. The three-dimensional space-time variation and Fourier spectrums characters of ground surface vibration vertical accelerations by high-speed train running on viaduct and embankment are simulated. The result shows that ground surface vibration is mainly excited by periodic axle force of the train in the site near the viaduct pier. In the site far from the viaduct pier, ground surface vibration is mainly from the transmission of the site near the viaduct pier. With the increased distance between the viaduct pier, the peak value of ground surface vibration vertical acceleration decreases, and decreases significantly when the distance is within 10m. There are two main frequency bands of Fourier spectrum of ground surface vibration vertical acceleration: low-frequency band 0-12Hz and high-frequency band 35-47Hz of viaduct route, and low-frequency band 0-21Hz and high-frequency band 25-45Hz of embankment route. In general, with the increased distance between viaduct/embankment, Fourier spectrum amplitude of every frequency band decrease, and attenuation speed of high-frequency band is much faster than-frequency band’s.

scholarly journals Volume and Frequency-Independent Spreading of Droplets Driven by Ultrasonic Surface Vibration

Fluids ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Matthew Trapuzzano ◽  
Andrés Tejada-Martínez ◽  
Rasim Guldiken ◽  
Nathan Crane
Keyword(s):  
Droplet Diameter ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Droplet Volume ◽  
Droplet Spreading ◽  
Maximum Acceleration ◽  
Surface Vibration ◽  
Glass Substrates ◽  
Frequency Independent ◽  
Surface Vibrations

Many industrial processes depend on the wetting of liquids on various surfaces. Understanding the wetting effects due to ultrasonic vibration could provide a means for changing the behavior of liquids on any surface. In previous studies, low-frequency surface vibrations have been used to alter wetting states of droplets by exciting droplet volume modes. While high-frequency (>20 kHz) surface vibration can also cause droplets to wet or spread on a surface, this effect is relatively uncharacterized. In this study, droplets of various liquids with volumes ranging from 2 to 70 µL were vibrated on hydrophobic-coated (FluoroSyl) glass substrates fixed to a piezoelectric transducer at varying amplitudes and at a range of frequencies between 21 and 42 kHz. The conditions for contact line motion were evaluated, and the change in droplet diameter under vibration was measured. Droplets of all tested liquids initially begin to spread out at a similar surface acceleration level. The results show that the increase in diameter is proportional to the maximum acceleration of the surface. Finally, liquid properties and surface roughness may also produce some secondary effects, but droplet volume and excitation frequency do not significantly change the droplet spreading behavior within the parameter range studied.

Forced Wetting of Liquids Using Ultrasonic Surface Vibration

2018 ◽  
Author(s):  
Matthew A. Trapuzzano ◽  
Nathan B. Crane ◽  
Rasim Guldiken ◽  
Andrés Tejada-Martínez
Keyword(s):  
Low Frequency ◽  
Hydrophobic Surface ◽  
Wetting Transitions ◽  
High Frequencies ◽  
Surface Vibration ◽  
Resonance Modes ◽  
Energy Inputs ◽  
Surface Resonance ◽  
Industry Applications ◽  
Surface Vibrations

Many processes rely on wetting of liquids on surfaces. The way a liquid wets a solid depends on chemistry, geometry, and local energy inputs. Low-frequency surface vibrations can effect wetting changes prompted by droplet oscillations. High-frequency (ultrasonic) surface vibration can also cause a liquid to wet or spread out on a solid, but governing mechanisms are relatively uncharacterized. To investigate, droplets are imaged as they vibrate on a hydrophobic surface over different high frequencies (> 10 kHz). Wetting transitions occur abruptly over a range of parameters, but coincide with surface resonance modes. The wetting change is proportional to droplet volume and surface acceleration, and remains after cessation of vibration, however new droplets wet with the original contact angle. Wetting control has various industry applications, and understanding these basic phenomena will help develop a deeper understanding of how ultrasonic vibration can be utilized to tune the behavior of liquids on any surface.

Study on the Blasting Vibration Characteristics of Shallow Tunnel under Unsymmetrical Pressure

2012 ◽  
Vol 204-208 ◽  
pp. 1405-1408
Author(s):  
Wen Xue Gao ◽  
Xi Meng Sun ◽  
Bing Hui Hou ◽  
Ning Ning Chen
Keyword(s):  
Vibration Frequency ◽  
Resonance Effect ◽  
Low Frequency ◽  
Ground Surface ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Tunnel Excavation ◽  
Surface Vibration ◽  
Lining Structure ◽  
Rock Tunnel

Based on Huolangyu tunnel of Mixing road, this paper researches the monitoring of ground surface vibration and the technology of controlled blasting. Monitoring and analysis results show: The ground surface vibration decline from constructed position to un-constructed position along tunnel excavation direction. The maximum ground surface vibration locates at the shallow position along tunnel cross section. The surface vibration velocity main vibration frequency has more than one advantage frequency, main vibration frequency concentration distribution in 20～40Hz low frequency band. Tunnel driving, the emphasis of the blasting vibration should focus on control of tunnel excavation area has the upper, lining structure and shallow buried in the influence of the surrounding rock; Tunnel through the surface buildings, cannot ignore already forming of blasting seismic effects of tunnel amplification and resonance effect.

Comparative Testing on Ground Surface Vibration Caused by CRH Trains Running on Viaduct and Embankment

2011 ◽  
Vol 347-353 ◽  
pp. 349-353
Author(s):  
Kun Ming Mao ◽  
Guo Xing Chen ◽  
Yang Zhang ◽  
Xiao Xing Hong ◽  
Bin Ruan
Keyword(s):  
Vibration Isolation ◽  
Low Frequency ◽  
Ground Surface ◽  
Vibration Velocity ◽  
Attenuation Curve ◽  
Main Frequency ◽  
Vibration Intensity ◽  
Surface Vibration ◽  
Low Frequency Vibration ◽  
Peak Value

Based on the measurement of the vertical velocity of ground surface vibration caused by CRH trains running on viaduct and embankment of Hu-Ning Intercity Railway, the characteristics and propagation attenuation rules of the ground surface vibration of two routes are analyzed. The result shows that the main frequency of ground surface vibration caused by the CRH trains running is less than 80Hz, which belongs to low frequency vibration. The number of carriages has little effect on ground surface vibration intensity. The effect of train speed for 153km/h to 201km/h on ground surface vibration intensity has no obvious difference. With the increased distance between the ground surface and the track, the main frequency of ground surface vibration on viaduct decreases, and the attenuation curve of peak value of ground surface vibration velocity becomes smoother. However, the main frequency of ground surface vibration on embankment is nearly unchanged and the attenuation curve of peak value of ground surface vibration velocity has several rebound regions of the vibration. Ground surface vibration intensity of viaduct is higher than that of embankment. The drainage trench built beside the embankment has vibration isolation effect on ground surface vibration.

scholarly journals Steady streaming in a two-dimensional box model of a passive cochlea

2014 ◽  
Vol 753 ◽  
pp. 254-278 ◽  
Author(s):  
Elisabeth Edom ◽  
Dominik Obrist ◽  
Leonhard Kleiser
Keyword(s):  
Basilar Membrane ◽  
Low Frequency ◽  
Acoustic Stimulation ◽  
Travelling Wave ◽  
Steady Streaming ◽  
Compliant Structure ◽  
Physiological Relevance ◽  
Theoretical Predictions ◽  
New Phenomena ◽  
Streaming Flow

AbstractAcoustic stimulation of the cochlea leads to a travelling wave in the cochlear fluids and on the basilar membrane (BM). It has long been suspected that this travelling wave leads to a steady streaming flow in the cochlea. Theoretical investigations suggested that the steady streaming might be of physiological relevance. Here, we present a quantitative study of the steady streaming in a computational model of a passive cochlea. The structure of the streaming flow is illustrated and the sources of streaming are closely investigated. We describe a source of streaming which has not been considered in the cochlea by previous authors. This source is also related to a steady axial displacement of the BM which leads to a local stretching of this compliant structure. We present theoretical predictions for the streaming intensity which account for these new phenomena. It is shown that these predictions compare well with our numerical results and that there may be steady streaming velocities of the order of millimetres per second. Our results indicate that steady streaming should be more relevant to low-frequency hearing because the strength of the streaming flow rapidly decreases for higher frequencies.

scholarly journals Some Characteristics of Human Body Surface Vibration Induced by Low Frequency Noise

2002 ◽  
Vol 21 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Yukio Takahashi ◽  
Kazuo Kanada ◽  
Yoshiharu Yonekawa
Keyword(s):  
Body Surface ◽  
Low Frequency ◽  
The Body ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Fat Percentage ◽  
Vibration Acceleration ◽  
Surface Vibration ◽  
Human Body Surface ◽  
Good Agreement

The body surface vibration induced by low frequency noise (noise-induced vibration) was measured at the forehead, the anterior chest and the anterior abdomen. At all the measuring locations, the increase steps in the vibration acceleration levels of the noise-induced vibrations was in good agreement with the increase steps, in the sound pressure levels of the noise stimuli. The vibration acceleration level measured at the forehead was found to increase suddenly at around 31.5–40 Hz, while the acceleration levels measured at the chest and abdomen increased with frequency at approximately constant rates in the 20- to 50Hz range. Our results showed no clear evidence of the effect of posture or bilateral asymmetry in the noise-induced vibration. We found that the noise-induced vibrations measured at the chest and abdomen were correlated negatively with the body fat percentage.

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