The Experts below are selected from a list of 21567 Experts worldwide ranked by ideXlab platform
F. L. Eisinger - One of the best experts on this subject based on the ideXlab platform.
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Acoustically induced structural fatigue of piping systems
Journal of Pressure Vessel Technology-transactions of The Asme, 1999Co-Authors: F. L. Eisinger, J. T. FrancisAbstract:Piping systems handling high-pressure and high-velocity steam and various process and hydrocarbon gases through a pressure-reducing device can produce severe Acoustic Vibration and metal fatigue in the system. It has been previously shown that the Acoustic fatigue of the piping system is governed by the relationship between fluid pressure drop and downstream Mach number, and the dimensionless pipe diameter/wall thickness geometry parameter. In this paper, the devised relationship is extended to cover Acoustic fatigue considerations of medium and smaller-diameter piping systems.
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ELIMINATING AIR-FLOW-INDUCED Acoustic Vibration IN COAL PULVERIZERS
Journal of Fluids and Structures, 1998Co-Authors: F. L. EisingerAbstract:A novel method is presented here for eliminating Acoustic Vibration within coal pulverizers. The method emerged from the study of an Acoustic Vibration which developed within the casing of a coal pulverizer at low to medium loads. The Vibration was characterized by an Acoustic quarterwave driven by swirling air-flow of parallel high velocity air-jets issuing from a rotating multi-air port arrangement. By converting the single frequency excitation energy of the air-jets into turbulent energy, utilizing a new air port design with strongly interacting (colliding) air-jets, the Vibration was eliminated. The theoretical background and results of the pre-and post-modification operational tests are presented.
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designing piping systems against Acoustically induced structural fatigue
Journal of Pressure Vessel Technology-transactions of The Asme, 1997Co-Authors: F. L. EisingerAbstract:Piping systems adapted for handling fluids such as steam and various process and hydrocarbon gases through a pressure-reducing device at high pressure and velocity conditions can produce severe Acoustic Vibration and metal fatigue in the system. It has been determined that such Vibrations and fatigue are minimized by relating the Acoustic power level (PWL) to being a function of the ratio of downstream pipe inside diameter D 2 to its thickness t 2 . Additionally, such Vibration and fatigue can be further minimized by relating the fluid pressure drop and downstream Mach number to a function of the ratio of downstream piping inside diameter to the pipe wall thickness, as expressed by M 2 Δp = f(D 2 /t 2 ). Pressure-reducing piping systems designed according to these criteria exhibit minimal Vibrations and metal fatigue failures and have long operating life.
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Prediction of Acoustic Vibration in Steam Generator and Heat Exchanger Tube Banks
Journal of Pressure Vessel Technology, 1996Co-Authors: F. L. Eisinger, J. T. Francis, Robert E. SullivanAbstract:Criteria are formulated for the development of Acoustic Vibration in transverse Acoustic modes in steam generator tube banks, based on flow and Acoustic parameters. Theoretical predictions are validated against available in-service data for nonvibrating and vibrating tube banks and published laboratory experimental data. The criteria can be used for the prediction of Acoustic Vibration in steam generator and heat exchanger tube banks both, in-line and staggered.
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EXPERIENCE WITH UNUSUAL Acoustic Vibration IN HEAT EXCHANGER AND STEAM GENERATOR TUBE BANKS
Journal of Fluids and Structures, 1996Co-Authors: F. L. Eisinger, Robert E. SullivanAbstract:Cases of atypical Acoustic Vibration in heat exchanger and steam generator tube banks are presented. The cases include a tubular air heater with Acoustic Vibration developed in the flow direction, a steam generator tube bank with Vibration developed along the tubes, and a shell and tube process heat exchanger with Acoustic Vibration developed in the shell axial direction. The vibratory cases were compared with a number of steam generator tube banks in service which did not develop Acoustic Vibration. The Vibration prediction methodology developed recently for heat exchangers vibrating in the transverse Acoustic modes was applied to the cases studied. It is shown that this methodology is also applicable to the prediction of the unusual Acoustic Vibration described in this paper.
Robert E. Sullivan - One of the best experts on this subject based on the ideXlab platform.
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Further Evidence for Acoustic Resonance in Full Size Steam Generator and Tubular Heat Exchanger Tube Banks
Volume 4: Fluid-Structure Interaction, 2009Co-Authors: Frantisek L. Eisinger, Robert E. SullivanAbstract:In the previous publications by Eisinger, F.L., Francis, J.T., and Sullivan, R.E., 1996, “Prediction of Acoustic Vibration in Steam Generator and Heat Exchanger Tube Banks”, ASME Journal of Pressure Vessel Technology, Vol. 118, pp. 221–236 and Eisinger, F.L. and Sullivan, R.E., 1996, “Experience with Unusual Acoustic Vibration in Heat Exchanger and Steam Generator Tube Banks”, Journal of Fluids and Structures, Vol. 10, pp. 99–107, prediction criteria for Acoustic Vibration or Acoustic resonance were formulated utilizing flow and Acoustic parameters derived from operating steam generator tube banks. Various parameters were used in those formulations, including the dominant parameter MΔp where M is the Mach number of the crossflow through the tube bank and Δp is the pressure drop through the tube bank. Here we present further evidence derived from operating experience of full size steam generator and tubular heat exchanger tube banks of which 19 experienced Acoustic Vibration or Acoustic resonance and 27 experienced no Vibration or no Acoustic resonance within the operating flow range. The present data show that the decisive parameter predicting the Acoustic Vibration or Acoustic resonance of a tube bank is the Acoustic particle velocity. The Acoustic particle velocity separates the Acoustically vibrating banks from those non-vibrating very clearly. The behavior is demonstrated graphically showing the dimensionless Acoustic particle velocity as a function of input energy parameter MΔp, Mach number M, Reynolds number Re and also Helmholtz number He = MS where S is the Strouhal number. This finding indicates that the Acoustic particle velocity criterion shall be used in conjunction with the previously used criteria as the basis for the prediction of Acoustic resonance in full size steam generator and tubular heat exchanger tube banks.Copyright © 2009 by ASME
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Prediction of Acoustic Vibration in Steam Generator and Heat Exchanger Tube Banks
Journal of Pressure Vessel Technology, 1996Co-Authors: F. L. Eisinger, J. T. Francis, Robert E. SullivanAbstract:Criteria are formulated for the development of Acoustic Vibration in transverse Acoustic modes in steam generator tube banks, based on flow and Acoustic parameters. Theoretical predictions are validated against available in-service data for nonvibrating and vibrating tube banks and published laboratory experimental data. The criteria can be used for the prediction of Acoustic Vibration in steam generator and heat exchanger tube banks both, in-line and staggered.
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EXPERIENCE WITH UNUSUAL Acoustic Vibration IN HEAT EXCHANGER AND STEAM GENERATOR TUBE BANKS
Journal of Fluids and Structures, 1996Co-Authors: F. L. Eisinger, Robert E. SullivanAbstract:Cases of atypical Acoustic Vibration in heat exchanger and steam generator tube banks are presented. The cases include a tubular air heater with Acoustic Vibration developed in the flow direction, a steam generator tube bank with Vibration developed along the tubes, and a shell and tube process heat exchanger with Acoustic Vibration developed in the shell axial direction. The vibratory cases were compared with a number of steam generator tube banks in service which did not develop Acoustic Vibration. The Vibration prediction methodology developed recently for heat exchangers vibrating in the transverse Acoustic modes was applied to the cases studied. It is shown that this methodology is also applicable to the prediction of the unusual Acoustic Vibration described in this paper.
Shang-zhong Jin - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Vibration sensor based on nonadiabatic tapered fibers.
Optics letters, 2012Co-Authors: Ben Xu, Zai-xuan Zhang, Miao Sun, Xin-yong Dong, Yi Li, Zhen-wei Zhang, Shang-zhong JinAbstract:A simple and low-cost Vibration sensor based on single-mode nonadiabatic fiber tapers is proposed and demonstrated. The environmental Vibrations can be detected by demodulating the transmission loss of the nonadiabatic fiber taper. Theoretical simulations show that the transmission loss is related to the microbending of the fiber taper induced by Vibrations. Unlike interferometric sensors, this Vibration sensor does not need any feedback loop to control the quadrature point to obtain a stable performance. In addition, it has no requirement for the coherence of the light source and is insensitive to temperature changes. Experimental results show that this sensing system has a wide frequency response range from a few hertz to tens of kilohertz with the maximal signal to noise ratio up to 73 dB.
Naoki Sakurai - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Vibration method for food texture evaluation using an accelerometer sensor
Journal of Food Engineering, 2013Co-Authors: Shin-ichiro Iwatani, Hidemi Akimoto, Naoki SakuraiAbstract:Abstract A piezoelectric element has been used in an Acoustic Vibration method for measuring food texture. While it is inserted into a food sample, the piezoelectric element detects the Vibration of a probe. The frequency response of the piezoelectric sensor used for the Acoustic Vibration method was evaluated with a laser Doppler vibrometer (LDV). The output voltage from the piezoelectric sensor, which was driven to vibrate at 23 different frequencies, was monitored and compared with the velocity signal obtained by the LDV. The output signal was substantially affected by the Vibration frequencies. The output signals corresponded to displacement of the probe below 3 Hz, to velocity from 10 to 70 Hz, and to the acceleration force from 680 to 1500 Hz. These results clearly indicate that a piezoelectric sensor is impractical to use for the texture measurement and should be replaced with an accelerometer that always generates an acceleration signal irrespective of the applied Vibration frequencies. The results also demonstrated that the previously defined texture index (TI) was misleading and overestimated the texture of food at probe Vibration frequencies above 10 Hz. Our replacement of the sensor led us to define a new energy texture index (ETI). ETI measurement of several foods, including biscuit, Japanese cracker and vegetables were presented and the effects of water activity of cracker on the index were examined.
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Measurement of food texture by an Acoustic Vibration method
2011Co-Authors: Naoki Sakurai, Mitsuru Taniwaki, Shin-ichiro Iwatani, Hidemi AkimotoAbstract:Food texture was measured by a new Acoustic Vibration method. A piezoelectric sensor sandwiched between a probe and piston was inserted into a food sample by delivery of silicon oil to a cylinder by a pump. Vibration emitted from the food sample on insertion of the probe was monitored by voltage outputs of the sensor. The voltage signals were passed through 19 half octave bands to calculate texture index for each band. The texture index was defined as Vibration energy of the probe caused by the food rupture and/or breakage per unit time.
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Evaluation of Grape Flesh Texture by Acoustic Vibration Method
IFAC Proceedings Volumes, 2010Co-Authors: Shin-ichiro Iwatani, Hiroshi Yakushiji, Nobuhito Mitani, Naoki SakuraiAbstract:Abstract To clarify the characteristics of grape flesh texture, Acoustic Vibrations generated by inserting a probe in grape flesh were measured. Texture index (TI) based on energy density, which was calculated from Vibration signals, could be used to classify 9 grape cultivars into 3 groups with their flesh textures evaluated as crisp, noncrisp, and intermediate, while breaking force measured by a conventional intrusive method did not. TI of 0–50-Hz band correlated with the breaking force, suggesting that TI of 0–50-Hz corresponds to flesh firmness, and TI of higher frequency characterizes crispness of grape flesh.
Tingyun Wang - One of the best experts on this subject based on the ideXlab platform.
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Broadband Acoustic Vibration Sensor Based on Cladding-Mode Resonance of Double-Cladding Fiber
Photonic Sensors, 2019Co-Authors: Guanghui Sui, Huanhuan Liu, Fufei Pang, Jiajing Cheng, Tingyun WangAbstract:We have proposed and demonstrated a double-cladding fiber (DCF) with cladding-mode resonance property for broadband Acoustic Vibration sensing. Since the fundamental mode in the core waveguide is able to be coupled to LP05 mode in the tube waveguide once the phase-matching condition is fulfilled, the transmission spectrum can exhibit a dip with a large extinction ratio. An Acoustic Vibration could induce the wavelength shift of such transmission spectrum, so that the intensity variation at a wavelength near the dip is coded with the information of the Acoustic Vibration signal. By demodulating the response of intensity variation, the frequency of the applied Acoustic Vibration signal can be recovered. Such a DCF-based sensor with an intensity modulation could measure the Acoustic Vibration with a broadband frequency range from 1 Hz to 400 kHz and exhibits the maximum signal-to-noise ratio (SNR) of ~80.79 dB when the Vibration frequency is 20 kHz. The obtained results show that the proposed DCF-based Acoustic Vibration sensor has a potential application in environmental assessment, structural damage detection, and health monitoring.
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Double Cladding Fiber for Acoustic Vibration Sensing
2018 Asia Communications and Photonics Conference (ACP), 2018Co-Authors: Guanghui Sui, Huanhuan Liu, Fufei Pang, Jiajing Cheng, Tingyun WangAbstract:We have demonstrated an Acoustic Vibration sensor based on double cladding fiber that exhibits band-reject filter spectrum. Such sensor can achieve maximum signal-to-noise ratio of ~80.79 dB subjected to Vibration with frequency of 20 kHz.
