Relevant bibliographies by topics / Snubber

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Snubber'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Snubber"

1

Nims, D. K., and J. M. Kelly. "Experimental Study of Mechanical Pipe Snubber Seismic Behavior." Journal of Pressure Vessel Technology 119, no. 3 (August 1, 1997): 384–88. http://dx.doi.org/10.1115/1.2842320.

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A series of seismic tests of mechanical snubbers on a full-scale model piping system provided a unique opportunity for detailed scrutiny of snubber seismic behavior on an actual piping system. The observed snubber behavior is a complicated pattern of braking and releasing, drag and drift, and the dynamic characteristics of the snubber, as well as the input motion, play a role in the response of the snubber. The snubbers were effective in limiting pipe displacements. Relative accelerations across the snubber were larger than expected. Snubber hysteretic behavior was irregular. Results from this testing are important in understanding snubber behavior, evaluating snubber performance, and in assessing alternatives to snubbers.
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Tseng, Sheng Yu, and Yi Ren Juang. "Approach to Developing Interleaved Converter with Single-Capacitor Turn-Off Snubber." Applied Mechanics and Materials 284-287 (January 2013): 2477–84. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2477.

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This paper presents a systematic approach to developing turn-off snubber for an interleaving converter to smooth out switch turn-off transition. With the approach, the interleaving converter with two turn-off snubbers, which are formed by two L-C-D type snubbers, can be replaced by the one with turn-off snubber composed of a single-capacitor snubber. It can be used in the basic six interleaved converters, such as buck, boost, buck-boost, ‘cuk, zeta and sepic converters. In this research, the structure of the interleaved converter with the turn-off snubber can be conveniently simplified from the derived general configurations, reducing the complexity of circuit structure significantly. Measured results from a buck prototype converter have been verified to prove the feasibility of the derived turn-off snubber.
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Steyn, C. G. "Analysis and optimization of linear regenerative snubbers." Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 5, no. 4 (March 18, 1986): 170–77. http://dx.doi.org/10.4102/satnt.v5i4.995.

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In this article both the general linear regenerative turn-on and turn-off snubbers are analysed and optimized independently from one another, in terms of minimum energy losses. The dissipative snubber - which was up to now the only optimized snubber - now becomes merely a special case of this general regenerative snubber. Equations describing the most important parameters are presented in tables, while some energy versus snubber size graphs are also shown.
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Tseng, Sheng-Yu, Hung-Yuan Wang, and Chih-Yang Hsu. "Performances of an Interleaved High Step-Up Converter with Different Soft-Switching Snubbers for PV Energy Conversion Applications." International Journal of Photoenergy 2013 (2013): 1–15. http://dx.doi.org/10.1155/2013/834510.

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This paper proposes an interleaved high step-up converter with different soft-switching snubbers for PV energy conversion applications. For the high step-up converter, interleaved and coupled-inductor technologies are used to reduce output ripple current and increase output power level. Simultaneously, two types of snubbers, a single-capacitor snubber and boost type snubber, are introduced separately into the discussed converters for comparing their performances of conversion efficiency and switching losses. For drawing maximum power from the PV arrays, a perturbation-and-observation method realized with the microcontroller is adopted to achieve maximum power point tracking (MPPT) algorithm and power regulating scheme. Finally, two prototypes of the interleaved coupled-inductor boost converter with a single-capacitor snubber and with boost type snubber are implemented, respectively. The experimental results obtained are used to verify and compare the performances and feasibilities of the discussed converters with different snubbers in PV conversion applications. The experimental results show that the proposed system is suitable for PV energy conversion applications when the duty ratios of switches of the converter are less than 0.5.
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Lay, C., O. A. Abu-Yasein, M. A. Pickett, J. Madia, and S. K. Sinha. "The Influence of Support Hardware and Piping System Seismic Response on Snubber Support Damping." Journal of Pressure Vessel Technology 119, no. 4 (November 1, 1997): 451–56. http://dx.doi.org/10.1115/1.2842329.

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The damping coefficients and ratios of piping system snubber supports were found to vary logarithmically with pipe support nodal displacement. For piping systems with fundamental frequencies in the range of 0.6 to 6.6 Hz, the support damping ratio for snubber supports was found to increase with increasing fundamental frequency. For 3-kip snubbers, damping coefficient and damping ratio decreased logarithmically with nodal displacement, indicating that the 3-kip snubbers studied behaved essentially as coulomb dampers; while for the 10-kip snubbers studied, damping coefficient and damping ratio increased logarithmically with nodal displacement.
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Fathali, Saeed, and André Filiatrault. "Effect of Elastomeric Snubber Properties on Seismic Response of Vibration-Isolated Mechanical Equipment: An Experimental Study." Earthquake Spectra 24, no. 2 (May 2008): 387–403. http://dx.doi.org/10.1193/1.2923921.

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Earthquake-simulator experiments were conducted on a liquid centrifugal chiller supported by four isolation/restraint systems with built-in elastomeric snubbers. The test plan incorporated variations of input motion amplitudes and snubber properties to investigate their effect on three response quantities: peak dynamic forces induced into the snubbers, peak acceleration, and peak relative displacement response of the equipment. The elastomeric snubbers limited the displacement responses of the vibration-isolated equipment at the expense of excessive dynamic forces and amplification of the equipment acceleration response. The snubber gap size was the most influential property on the response quantities. For high-amplitude input motions, all the response quantities increased with an increase of the gap size. Due to the compressibility of the snubber elastomeric contact-surface, the actual gap size was always larger than the nominal gap size. Even with a nominal gap size less than 0.25 in., the seismic response of the equipment was substantially different from the seismic response of rigidly mounted equipment. Compared to snubbers with constant contact-surface, snubbers with expanding contact-surface resulted in lower dynamic forces. The thicker and softer contact-surface could lower the dynamic forces induced into the snubbers but resulted in larger relative displacement response of the equipment.
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., Soumya, A. N. Nagashree, and R. S. Geetha. "Comparision of Voltage Stress Across the MOSFET Switch of a Flyback Converter with Various Snubbers." International Journal of Innovative Science and Research Technology 5, no. 6 (July 21, 2020): 1567–71. http://dx.doi.org/10.38124/ijisrt20jun1114.

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A Flyback converter is a simple switch-mode power supply that can be used to generate a DC output from either an AC or DC input. The converter switch is the most critical part of any converter. The voltage stress across the switch is a major issue as the high voltage spikes occur due to interaction between its output capacitance and the leakage inductance of the transformer. These spikes can be reduced with various snubbers like conventional tertiary winding, Resistor Capacitor and Diode(RCD) snubber, energy regenerative snubber and an active clamp snubber. This paper aims to analyze and compare the voltage stress across the MOSFET switch of Flyback converter with various snubber circuits.
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Pickett, M. A., D. J. Cunningham, S. K. Sinha, and J. Madia. "Application of the Ritz Averaging Method in the Analysis of the Seismic Performance of Piping Systems." Journal of Pressure Vessel Technology 109, no. 3 (August 1, 1987): 315–22. http://dx.doi.org/10.1115/1.3264871.

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The Ritz averaging method is utilized to reduce the nonlinear characteristics of piping system supports (snubbers) to equivalent linear support stiffnesses during seismic excitation. The equivalent snubber support stiffnesses are used in seismic modal analyses of two piping systems. The analyses are performed in order to determine the effect that high snubber lockup velocities have on piping system stresses. The results show that the lockup velocity of snubbers in the systems analyzed can be safely allowed to increase above normal limits without any significant increase in nodal stresses.
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Krishnan Nair, Divya, Krishnamachar Prasad, and Tek Tjing Lie. "Implementation of Snubber Circuits in a PV-Based Off-Grid Electric Vehicle Charging Station—Comparative Case Studies." Energies 14, no. 18 (September 16, 2021): 5853. http://dx.doi.org/10.3390/en14185853.

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With the penetration of electric vehicles (EVs), there have been paradigm shifts in the transportation sector. EVs are ideally considered to be clean and eco-friendly, but they can overload the existing grid infrastructure and significantly contribute towards carbon emissions depending on the source of charging. The ideal solution is to develop a charging infrastructure for EVs that is integrated with solar energy technology. This paper presents the design of a zero-voltage switching snubber-based bidirectional converter for an off-grid charging station for EVs. The proposed system includes a solar array with a boost converter, a bidirectional converter with snubber circuits and an energy storage unit. A comprehensive comparison between various types of snubbers, such as the resistive capacitive diode snubber, active clamp snubber and flyback snubber, is presented. This type of system configuration clamps the rail voltage, due to the difference in current between leakage inductance and low voltage side-fed inductor currents, resulting in reduced current spikes at the converter’s switches. Such a converter, therefore, leads to higher efficiency of the charging station for EVs. The design of a snubber-based off-grid charging station for EVs is formulated and validated in the MATLAB/Simulink environment.
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Singh, Alok, Mangesh B. Borage, Sunil R. Tiwari, and A. C. Thakurta. "On the Development of High Power DC-DC Step-Down Converter with Energy Recovery Snubber." Advances in Power Electronics 2012 (July 2, 2012): 1–10. http://dx.doi.org/10.1155/2012/806738.

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The effect of switching losses on the efficiency of a switch mode power converter and methods adopted for its improvement using an energy recovery lossless snubber has been presented. A comparative analysis of various types of soft switching techniques along with effects of dissipative and nondissipative snubbers on efficiency of the converter has been carried out before zeroing in on the selected scheme. The selected snubber serves the dual function of a turn-on and turn-off snubber and thereby reducing the switching losses both during turn-on and turn-off transients, resulting in improved efficiency of the converter. A detailed design procedure of the snubber for high-power applications taking into account various effects such as diode reverse recovery, diode voltage stress, and minimum and maximum duty cycle limits, has been presented in this paper. Importance of practical aspects in layout to minimize wiring inductance is also highlighted. A high-power prototype of buck converter has been developed to experimentally validate the theoretical design and analytical observations.
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Dissertations / Theses on the topic "Snubber"

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Lima, Luiz Ricardo. "Inversor monofásico NPC com snubber regenerativo." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/2089.

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This work presents a study about the NPC (Neutral Point Clamped) three-level inverter with a modified Undeland snubber and using a Buck-Boost converter to regenerate the energy processed by the snubber. Initially, qualitative and quantitative analysis of this inverter with the presence of the snubber are presented and a project methodology is proposed. The same analysis and project are presented for the Buck-Boost converter and it is shown that this converter can operate under ZVS (Zero Voltage Switching). Next, mathematical models of all circuitry necessary for the realization of the digital control of the inverter are presented and a controller is projected. Using data of the projected NPC inverter, Buck-Boost converter and digital controller, simulation results are presented. These simulations were done using software s Orcad Pspice and Simulink. Finally, implementation details and experimental results of a 1.5 kW, 800 V input voltage, 127 V output voltage and 200 kHz switching frequency prototype are presented.
Este trabalho apresenta um estudo do inversor NPC (Neutral Point Clamped) a três níveis com snubber de Undeland modificado, utilizando um conversor Buck-Boost para regeneração da energia processada pelo snubber. Inicialmente são feitas analises qualitativa e quantitativa desse inversor com a presença do snubber e é apresentada uma metodologia de projeto. As mesmas analises e projeto são feitos para o conversor Buck-Boost e é mostrado como ele pode operar com comutação ZVS (Zero Voltage Switching). A seguir são mostrados os modelos matemáticos de todos os circuitos necessários para se realizar o controle digital do inversor e é apresentado um projeto de controlador digital. Utilizando os dados de projeto do inversor NPC, do conversor Buck-Boost e do controle são apresentados os resultados de simulações feitas nos programas Orcad Pspice e Simulink. Por ultimo, são apresentados detalhes de implementação e resultados experimentais de um protótipo de 1,5 kW, 800 V de tensão de barramento, 127 V de tensão de saída e 200 kHz de freqüência de comutação.
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Wei, Yu. "A Novel Auxiliary Resonant Snubber Inverter Using Wide Bandgap Devices." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83238.

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In the application of power inverters, power density has become a key design specification where it has stringent requirements on system size and weight. Achieving high power density need to combine lasted wide bandgap (WBG) device technology and high switching frequency to reduce passive filter size thus further shrink overall space. While still maintaining decent power conversion efficiency and low electromagnetic interference (EMI) with higher switching frequency, soft-switching needs to be implemented. A novel auxiliary resonant snubber is introduced. The design and operation are carried out, in which this snubber circuitry enables main Gallium Nitride (GaN) switches operating under zero voltage switching (ZVS) condition, and auxiliary Silicon Carbide (SiC) diodes switching under zero current switching (ZCS) condition. Besides, the auxiliary snubber circuitry gating algorithm is also optimized which allows reduction of the switching and conduction loss in auxiliary GaN switches to obtain higher system efficiency and better thermal performance. Here, this novel auxiliary resonant snubber circuitry is applied to a traditional full bridge inverter with flexible modulation suitability. This proposed inverter can be applied to a wide range of potential applications, such as string solar inverter, renewable energy combined distributed generation, dc-ac part of bi-directional electrical vehicle (EV) on-board charger, and uninterruptible power supply (UPS), etc.
Master of Science
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Faraci, William Eric. "Design of a Resonant Snubber Inverter for Photovoltaic Inverter Systems." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/47800.

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With the rise in demand for renewable energy sources, photovoltaics have become increasingly popular as a means of reducing household dependence on the utility grid for power. But solar panels generate dc electricity, a dc to ac inverter is required to allow the energy to be used by the existing ac electrical distribution. Traditional full bridge inverters are able to accomplish this, but they suffer from many problems such as low efficiency, large size, high cost, and generation of electrical noise, especially common mode noise. Efforts to solve these issues have resulted in improved solutions, but they do not eliminate all of the problems and even exaggerate some of them. Soft switching inverters are able to achieve high efficiency by eliminating the switching losses of the power stage switches. Since this action requires additional components that are large and have additional losses associated with them, these topologies have traditionally been limited to higher power levels. The resonant snubber inverter is a soft switching topology that eliminates many of these problems by taking advantage of the bipolar switching action of the power stage switches. This allows for a significant size reduction in the additional parts and elimination of common mode noise, making it an ideal candidate for lower power levels. Previous attempts to implement the resonant snubber inverter have been hampered by low efficiency due to parasitics of the silicon devices used, but, with recent developments in new semiconductor technologies such as silicon carbide and gallium nitride, these problems can be minimized and possibly eliminated. The goal of this thesis is to design and experimentally verify a design of a resonant snubber inverter that takes advantage of new semiconductor materials to improve efficiency while maintaining minimal additional, parts, simple control, and elimination of common mode noise. A 600 W prototype is built. The performance improvements over previous designs are verified and compared to alternative high efficiency solutions along with a novel control technique for the auxiliary resonant snubber. A standalone and grid tie controller are developed to verify that the auxiliary resonant snubber and new auxiliary control technique does not complicate the closed loop control.
Master of Science
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Chen, Yen-Ming. "RC Snubber Design using Root-Loci Approach for Synchronous Buck SMPS." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/963.

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This thesis presents an analytical approach using Root-Loci method for designing optimum passive series RC snubbers for continuous-current synchronous buck switch mode power supply (SMPS). Synchronous buck SMPS is the most popular power converter topology found in modern consumer electronics. It offers relatively good efficiency to target the high-current and low-voltage requirements while it is also relatively inexpensive to implement. Passive series RC snubbers are simple, efficient and cost-effective open-loop equalizer circuit for synchronous buck SMPS. Its purpose is to control and to balance between the rate of rise and the overshoots of transient switching waveform in order to optimize efficiency and reliability Existing methods of RC snubber design are solely based on second-order approximation. It is investigated in this research that this approximation is highly inaccurate in SMPS applications because higher order equivalent models are required for the load path of the SMPS. The results using the RC snubbers obtained from existing method are shown to be unsatisfactory without correlation to the calculations and simulations based on second-order approximation. Optimum RC values obtained using Root-Loci approach presented in this thesis are shown to correlate to both Spice simulation and lab measurements.
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姚建明 and Jianming Yao. "Control schemes and performance improvement of resonant snubber soft-switching inverters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31220198.

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Yao, Jianming. "Control schemes and performance improvement of resonant snubber soft-switching inverters /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2051007X.

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Tang, Yuqing. "High Power Inverter EMI Characterization and Improvement by Auxiliary Resonant Snubber Inverter." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/31022.

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Electromagnetic interference (EMI) is a major concern in inverter motor drive systems. The sources of EMI have been commonly identified as high switching dv/dt and di/dt rates interacting with inverter parasitic components. The reduction of parasitic components relies on highly integrated circuit layout and packaging. This is the way to deal with noise path. On the other hand, switching dv/dt and di/dt can be potentially reduced by soft-switching techniques; thus the intensity of noise source is reduced.

In this paper, the relation between the dv/dt di/dt and the EMI generation are discussed. The EMI sources of a hard-switching single-phase PWM inverter are identified and measured with separation of common-mode and differential-mode noises. The noise reduction in an auxiliary resonant snubber inverter (RSI) is presented. The observation of voltage ringing and current ringing and the methods to suppress these ringing in the implementation of RSI are also discussed. The test condition and circuit layout are described as the basis of the study. And the experimental EMI spectra of both hard- and soft-switching inverter are compared. The effectiveness and limitation of the EMI reduction of the ZVT-RSI are also discussed and concluded.

The control interface circuit and gate driver design are described in the appendix. The implementation of variable charging time control of the resonant inductor current is also explained in the appendix.
Master of Science

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Combrink, Frederik Wilhelm. "Analysis and synthesis of an active resonant snubber for high-power IGBT converters." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52090.

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Thesis (MScEng)--University of Stellenbosch, 2001.
ENGLISH ABSTRACT: This thesis describes the study of two soft-switching inverter topologies that are well suited to high-power applications. For the first topology, namely an active resonant turn-off snubber, the existing theory is expanded with a detailed study into operation strategies and topology protection. This is followed by an investigation into the second topology, which is a combined snubber that reduces both turn-off and turn-on losses. The investigation involves a detailed analysis of the losses in the snubber components and main devices, as well as a study into the effects of parasitic components and diode reverse recovery on the operation of the snubber. Based on this theory a snubber optimisation procedure is also developed. Possible operation strategies and protection techniques were also evaluated for this topology. Single-phase experimental inverters were used to verify the basic operation theory and switching loss prediction for both topologies. The thesis is concluded by the design and construction of a practical soft-switching threephase inverter. After implementation the experimental inverter is used for theory verification.
AFRIKAANSE OPSOMMING: Hierdie proefskrif beskryf die ondersoek na twee saggeskakelde omsetter topologieë wat veral geskik is vir hoë-drywing toepassings. Die bestaande teorie aangaande die eerste topologie, naamlik 'n aktiewe, resonante, afskakel gapser, word uitgebrei met 'n deeglike-studie oor bedryfstegnieke en beskermingsmetodes. Vervolgens word 'n gekombineerde gapser topologie, wat beide aanskakel- en afskakelverliese verminder, ondersoek. Die studie behels 'n volledige analise van die verliese in die omsetter en gapser komponente en die invloed van parasitêre komponente en diode tru-herstel. Hierdie teorie word ook gebruik om 'n optimale gapser ontwerp prosedure te ontwikkel. Die moontlikke bedryfstegnieke en beskermingsmetodes word ook vir hierdie topologie evalueer. In albei gevalle is eksperimentele, enkelfase omsetters gebruik om die teorie oor basiese werking en skakelverlies vermindering te verifieer. Die ondersoek word afgesluit deur die ontwerp en konstruksie van 'n praktiese, saggeskakelde, drie-fase omsetter te beskryf. Na implimentering van die omsetter word volledige eksperimentele verifikasie uitgevoer.
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Novaes, Yales Rômulo de. "Estudo de um Snubber para o inversor de três níveis com netro grampeado." Florianópolis, SC, 2000. http://repositorio.ufsc.br/xmlui/handle/123456789/79250.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.
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Este trabalho apresenta o estudo do inversor Três Níveis, também conhecido como inversor com ponto neutro grampeado, da sigla inglesa N.P.C. Inicialmente, são explicados os princípios de funcionamento do inversor, através da utilização da estratégia de modulação por largura de pulso único. A seguir, são apresentadas e comparadas qualitativamente as demais técnicas de modulação existentes na literatura, para aplicação ao inversor Três Níveis. É apresentada a análise teórica, primeiramente demonstrando o equacionamento dos esforços de corrente nos interruptores do inversor, desconsiderando as comutações. Em seguida, a aplicação da técnica passiva de comutação suave, conhecida como Snubber de Undeland (modificado), é explorada detalhadamente. Ao final, tem-se os resultados da experimentação de um inversor de 10 kVA, comutando a uma freqüência de 20 kHz. Diante dos resultados apresentados, são mencionados os efeitos causados pelos componentes parasitas existentes em um circuito real. São, também, comentados os aspectos positivos e negativos da utilização do snubber ao inversor.
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Ngatu, Grum T. "Development of a snubber type magnetorheological fluid elastomeric lag damper for helicopter stability augmentation." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9326.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2009.
Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Books on the topic "Snubber"

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Hoban, Peter Thomas. Numerical modelling of multilayer semiconductor devices: An investigation into reverse recovery voltage snap-offin snubber diodes. Birmingham: Aston University. Department of Computer Science and Applied Mathematics, 1990.

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Boucht, Birgitta. Tusenblad, en kvinna som snubblar: Roman. Helsingfors: Schildts, 2011.

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Ochosa, Orlino A. Viva Isabelo Abaya!: A belated salute to the Ilocano hero snubbed by history. Quezon City: Giraffe Books, 1999.

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Anell, Barbro. Att snubbla in i framtiden: En ESO-rapport om statlig omvandling och avveckling. Stockholm: Finansdepartementet, 1999.

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Bedi, Gurjendra S. Guidelines for inservice testing at nuclear power plants: Inservice testing of pumps and valves and inservice examination and testing of dynamic restraints (snubbers) at nuclear power plants : final report. Washington, D.C: U.S. Nuclear Regulatory Commission, Office of Nuclear Reactor Regulation, 2013.

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Results of LWR snubber aging research. Washington, DC: Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1992.

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P, Brown D., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering., Lake Engineering Company, Wyle Laboratories, and Pacific Northwest Laboratory, eds. Basis for snubber aging research: Nuclear plant aging research program. Washington, DC: Division of Engineering, Office of Nuclear Regulatory, U.S. Nuclear Regulatory Commission, 1990.

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Krawchuk, Ken V. Atlas Snubbed. Ken Krawchuk & Associates, Ltd., 2011.

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Smith, Laura Rountree. Snubby Nose And Tippy Toes. Kessinger Publishing, LLC, 2004.

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Smith, Laura Rountree]. Snubby Nose And Tippy Toes. IndyPublish.com, 2006.

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Book chapters on the topic "Snubber"

1

Heumann, Klemens. "Snubber Circuits, Triggering, Cooling, and Protection Devices." In Basic Principles of Power Electronics, 36–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82674-0_4.

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Huh, Sun Chul, Han Shik Chung, Hyo Min Jeong, and Byeong Keun Choi. "ASME Code Evaluation on Stress Analysis of Snubber." In Experimental Mechanics in Nano and Biotechnology, 1339–42. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1339.

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Neve, Abhishek G., Ganesh M. Kakandikar, Omkar Kulkarni, and V. M. Nandedkar. "Optimization of Railway Bogie Snubber Spring with Grasshopper Algorithm." In Advances in Intelligent Systems and Computing, 941–52. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1097-7_80.

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Do, Hyun-Lark. "A Passive Lossless Snubber Applied to Power Factor Correction Boost Converter." In Lecture Notes in Electrical Engineering, 419–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25905-0_55.

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Yun, Hyeok-Jin, Jong-Hyun Kim, Myung-Hyo Ryu, and Hee-Je Kim. "A Boost PFC Rectifier with a Passive Lossless Snubber Circuit Using Coupled Inductors Methodes." In Intelligent Robotics and Applications, 334–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40849-6_32.

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Dong, Shuai, Chongjian Li, Chunyi Zhu, and Chengsheng Wang. "Influence of the Snubber Circuit on the Commutation Process of High-Power Five-Level Converter." In Proceedings of the Second International Conference on Mechatronics and Automatic Control, 793–99. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13707-0_87.

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Fu, Yao, Lijun Diao, Huiqing Du, Haijie Jia, and Lei Wang. "Design and Research for the Low-Loss Passive Snubber Circuit Used in the Metro High Frequency Auxiliary Converter." In Lecture Notes in Electrical Engineering, 83–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-53751-6_9.

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"The snubber – a special type of STU for nuclear power plants and pipelines." In Shock Transmission Units in Construction, 107–19. ICE Publishing, 2013. http://dx.doi.org/10.1680/stu.57135.107.

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"The Young Rhymer Snubbed." In The Complete Poems of William Barnes, Vol. 2: Poems in the Modified Form of the Dorset Dialect. Oxford University Press, 2018. http://dx.doi.org/10.1093/oseo/instance.00257926.

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"Accessories (Seals, Snubbers Calibrators, Manifolds)." In Measurement and Safety, 1145–54. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315370330-94.

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Conference papers on the topic "Snubber"

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Singley, Matthew P., John H. Gray, Vijay K. Verma, Maury A. Pressburger, and Glenn Chatterton. "Snubber Optimization Utilizing Gapped Struts in Nuclear Power Plants: River Bend Station." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78588.

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At Entergy River Bend Station (a 978 MWe BWR located near Baton Rouge, Louisiana) snubber examination and testing have become unwanted expenses with the potential to lengthen planned outages and increase ALARA concerns. This paper presents a new concept for snubber replacement which can be used to expand the “Snubber to Strut” methodology. The E-BAR is a passive gapped support fabricated to be a “drop-in” replacement for snubbers. During normal plant operation the E-BAR functions like a box support, and during dynamic loading the E-BAR limits pipe motion and functions as a seismic restraint. Combining the guidance of WRC-300 [1] (snubber to strut criteria) and the industry practice of installing box supports with 1/16″ gaps between the pipe face and steel frame, generic criteria were developed to facilitate drop in snubber replacements. Replacements based on these criteria do not require re-analysis of the piping system. At the River Bend Station 102 snubbers were identified with thermal movements between 1/16″ and 3/8″. Sixty four snubbers (> 60%) met the generic criteria and were shown to be located at appropriate locations for snubber replacement. Development and explanation of the generic criteria and their applications are discussed here-in.
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Mayes, Alex, and Kshitij P. Gawande. "Study of Thermal Distribution in the Shock Suppressors (Snubbers) due to Heat Induced by High Frequency Vibrations." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93159.

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Abstract Hydraulic shock suppressors (snubbers) are used in dynamic restraints to prevent piping systems and equipment from occasional loads such as turbine trips, sudden valve closures, and seismic events. An occasional load can be defined as an impact load where forces and moments are applied over very short periods of time. The current study is a continuation of a published study on snubbers experiencing high frequency vibrations. The previous study concluded that snubbers should not be used in high frequency vibratory environments due to deterioration in the quality of hydraulic fluid and an increase in wear on snubber components. The present study takes a closer look at heat energy added to the system due to such high frequency vibrations. The power delivered by a typical vibration observed in an industrial piping system is calculated and assumed to enter into the snubber fluid as heat. This is modeled using a thermal finite element simulation and the resulting thermal distribution pattern, within the snubber body, is produced. Also, a separate analysis is performed in order to get a thermal distribution pattern on a snubber due to an increase in the environmental temperature. This distribution pattern is then compared with the one obtained from an internal heat source. The study is performed using computational methods in conjunction with analytical methods to determine if heat energy is the main cause of snubber fluid deterioration.
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Palmer, Glen R. "Snubber Program Transition From ISI Code to IST Code, ISTD." In ASME/NRC 2017 13th Pump and Valve Symposium. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvs2017-3519.

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The ASME OM Code, Subsection ISTD, is the required code for conducting preservice and inservice examination and testing of dynamic restraints (Snubbers). The latest approved edition of this OM Code is now, or soon to be the 2012 Edition. With the publication of the 2006 addenda to Section XI of the ASME Boiler & Pressure Vessel Code, the snubber requirements, which were previously located in Article IWF-5000, were deleted. When the requirements of IWF-5000 were deleted, the requirements for examination and testing of snubbers as required by 10CFR50.55a were required to be in accordance with the ASME OM Code, Subsection ISTD. When Owners prepare their ten-year ISI program updates that incorporate the 2006 Addenda and later of the Section XI Inspection Code, the snubber requirements will be required to be in accordance with the ASME OM Code, Subsection ISTD, 2004 Edition with Addenda through 2006 or later approved editions. This edition of the ASME OM Code has been referenced in the NRC Regulations dated June 21, 2011. Since that time, Owners are required to meet the requirements of the latest approved edition of the ASME OM Code, for snubber examination and testing requirements when snubber programs are updated. With the transition of the snubber program from the ISI program and ASME Section XI Code requirements to the IST program and the ASME OM Code, there is sometimes confusion and implementation gaps where regulatory program requirements could be missed. This paper will address the transition and identify potential pitfalls and how to mitigate them. Paper published with permission.
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Bedi, Gurjendra S. "Inservice Examination and Testing Issues for Dynamic Restraints (Snubbers) in Nuclear Power Plants." In ASME/NRC 2014 12th Valves, Pumps, and Inservice Testing Symposium. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/nrc2014-5011.

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This paper discusses recent issues related to inservice examination and testing of dynamic restraints (snubbers) at U.S. nuclear power plants. These issues were identified during the U.S. Nuclear Regulatory Commission (NRC) staff review of snubber examination and testing programs, relief requests, and applicable operating experience. This discussion includes information that could have generic applicability in the implementation of effective snubber programs at U.S. nuclear power plants. Paper published with permission.
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Bedi, Gurjendra S. "Inservice Examination and Testing Issues for Dynamic Restraints (Snubbers) in Nuclear Power Plants." In ASME/NRC 2017 13th Pump and Valve Symposium. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvs2017-3522.

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This paper discusses recent issues related to the inservice examination and testing of dynamic restraints (snubbers) at U.S. nuclear power plants. The U.S. Nuclear Regulatory Commission (NRC) staff identified these issues during its review of examination and testing snubber programs and relief requests, as well as operating experience. This discussion includes information that could apply generically to the implementation of effective snubber programs at U.S. nuclear power plants. Paper published with permission.
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Palmer, Matt. "Delivering the Nuclear Promise Through Effective ISE and IST Programs for Dynamic Restraints." In ASME/NRC 2017 13th Pump and Valve Symposium. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvs2017-3520.

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Delivering cost reductions via the Nuclear Promise can appear to be at odds with the safe operation and maintenance of nuclear facilities. However, In-Service Examination (ISE) and In-Service Testing (IST) programs can deliver significant gains in efficiency and effectiveness with proper application of the ASME O&M code. Along with scheduled maintenance prescribed by the manufacturer, Dynamic Restraints (snubbers) require periodic visual inspection and testing to ensure the installed population will perform its safety function during seismic events or dynamic operational transients. Methods prescribed in the ASME O&M Code Subsection ISTD are effective in identifying bad actors and verifying the operational readiness of the population, but can come at a significant cost when not properly utilized, especially when the penalty for a failed test or inspection is applied to the ISE or IST campaign. The Nuclear Promise can be realized in a snubber ISE or IST program with a thorough understanding of the intent of the prescribed testing and the mechanics of the safety functions to be verified. With this understanding, legacy requirements that were grandfathered into a program can be examined as to their relevance, and procurement specifications and testing procedures can be written that are pertinent and current to industry best practices. This paper, through the lens of a snubber manufacturer and ASME certificate holder, examines some common and uncommon examples found in industry that add significant cost, time, or dose to a snubber ISE/IST program, and the basis for eliminating them. The methodology used to evaluate an ISE/IST program requirement and determine its effectiveness in verifying a snubber’s safety function while satisfying the O&M code could be used for other components under the jurisdiction of the O&M code. In this manner, the Nuclear Promise can be safely delivered in an ISE/IST program that does not compromise the intent or integrity of Code requirements. Paper published with permission.
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Palmer, Glen. "ISTD Implementation and Service-Life Monitoring." In ASME/NRC 2014 12th Valves, Pumps, and Inservice Testing Symposium. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/nrc2014-5029.

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Subsection ISTD of ASME’s Operation and Maintenance of Nuclear Power Plants (OM Code) is the required code for preservice and inservice examination and testing of dynamic restraints (snubbers). This code replaced the inspection requirements of Article IWF-5000, “Inservice Inspection Requirements for Snubbers,” in Section XI, “Inservice Inspection of Nuclear Power Plant Components,” of the ASME Boiler and Pressure Vessel Code after the publication of the 2006 addenda to Section XI, which deleted Article IWF-5000. When the requirements of IWF-5000 were deleted, the requirements for examination and testing of snubbers, as required by Section 50.55a, “Codes and Standards,” of Title 10, “Energy,” of the Code of Federal Regulations (10 CFR 50.55a) became those specified by Subsection ISTD of the ASME OM Code. Therefore, when nuclear power plant owners prepare their ten-year inservice testing (IST)/inservice inspection (ISI) program updates that incorporate the 2006 (or later) addenda to Section XI, the snubber requirements will be required to be in accordance with those of Subsection ISTD of the latest approved edition and addenda of the ASME OM Code (2004 Edition with Addenda through 2006). This edition of the ASME OM Code is cited in the NRC Rulemaking which was published on June 21, 2011. Because this is a change in requirements, owners should be asking some of the following questions: What is the difference between our existing program requirements and those included in Subsection ISTD of the ASME OM Code? How will this change our existing program or the way the current snubber examination and testing program is implemented? How much effort will be required to implement this program change? This paper will provide some specific guidance for the implementation of the ISTD Code and will identify typical areas where changes may be required to existing snubber examination and testing programs. It will also describe some approaches to satisfy the requirements of ISTD-6000, “Service Life Monitoring,” which might not have been included in the previous requirements under Section XI. Paper published with permission.
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Gawande, Kshitij P., Phillip Wiseman, and Alex Mayes. "A Case for Avoiding Hydraulic Shock Suppressors (Snubbers) in the Vibratory Environments." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-85035.

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Whenever undesirable dynamic events occur within power plant, refinery, or process piping systems, specialty supports and restraints have the task of protecting the mechanical equipment and connecting piping from damaging loads and displacements. The array of components that may be affected include, but are not limited to, piping systems, pumps, valve assemblies, pressure vessels, steam generators, boilers, and heat exchangers. In particular, the dynamic events can be classified into two distinct types that originate from either internal events or external events. The internal dynamic load generating events include plant system start-up and shut-down, pressure surges or impacts from rapid valve closures such as steam and water hammer, boiler detonations, pipe rupture, and operating vibratory displacements that may be either low frequency or high frequency vibrations. The external dynamic load generating events include wind loads, earthquake, airplane impact to supporting structures and buildings, and explosions. Most of the aforementioned dynamic load generating events can be defined quite simply as impact loads, i.e., forces and moments that are applied over very short periods of time, for example, less than one second. While earthquake loads may be applied over a total time period of an hour or so, the peak loads and resulting displacements occur on a more sinusoidal basis of peak-to-peak amplitudes. One of the most common specialty restraint components utilized in the piping industry to absorb and transfer the dynamic load resulting from impact events is the hydraulic shock suppressor, otherwise known as the snubber. The snubber is a formidable solution to protecting plant piping systems and equipment from impact loading while not restricting the thermal displacements during routine operations. In the dynamic events that may be characterized by an impact type loading, snubbers provide an instantaneous, practically rigid, axial connection between the piping or other component to be secured and the surrounding structure whether it be concrete or steel (for example). In this way, the kinetic energy can be transmitted and harmlessly dissipated. In the vibratory environment, however, neither the impact load scenario nor the rapid translations are imposed upon snubbers, thereby presenting the competing intended application of the snubber to protect against impact loads versus, in many cases, the improper selection of the snubber to dampen vibratory (other than seismic) loads. The details of the hydraulic shock suppressor design are reviewed and discussed to exemplify why a case can and should be made against the use of snubbers in piping systems within an operating vibratory environment.
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Wiseman, Phillip, Alex Mayes, and Shreeya Karnik. "Case Study of the Effect of Combined Axial and Lateral Loadings on the Critical Buckling Capacity of Piping Supports." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21517.

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Abstract Snubbers are used in industry to restrain piping in dynamic events which can see significant axial loading as well as lateral acceleration. Snubbers are often employed with an extension when required to bridge gaps between the piping and building structure. As a result, they are susceptible to buckling instability issues. The pipe support and restraint design by analysis buckling criteria for supports given within the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Section III, Division 1, Subsection NF is investigated to determine the behavior of snubber assemblies under combined axial and lateral loadings. Four types of analyses are performed on the assemblies under the action of axial loading to demonstrate finite element and closed form solutions. These include the following: linear Eigen buckling, nonlinear second order large deformation method, energy method and Euler Bernoulli beam theory. In addition, a variety of snubber assembly sizes are subjected to combined axial and lateral loading in the form of multiple magnitudes of lateral acceleration. The behavior was analyzed by the Euler Bernoulli beam theory and nonlinear second order large deformation method. The techniques of each method are compared providing explanations of the assumptions taken, relevant limitations and recommended applications.
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Darwish, M., C. C. Marouchos, A. I. Janbey, and H. Amreiz. "Energy Efficient Snubber Networks." In 2019 54th International Universities Power Engineering Conference (UPEC). IEEE, 2019. http://dx.doi.org/10.1109/upec.2019.8893471.

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Reports on the topic "Snubber"

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Brown, D. P., E. V. Werry, and D. E. Blahnik. Results of LWR snubber aging research. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/5244947.

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Brown, D. P., G. R. Palmer, E. V. Werry, and D. E. Blahnik. Basis for snubber aging research: Nuclear Plant Aging Research Program. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/5065261.

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Chesnutwood, Kevin L. Redesign of the 112.5 kN dead weight machine snubber system. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.ir.7164.

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