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Статті в журналах з теми "Pneumatically controlled pressure regulator"
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Perdigones, Francisco, Antonio Luque, and José M. Quero. "Novel Structure for a Pneumatically Controlled Flow Regulator With Positive Gain." Journal of Microelectromechanical Systems 19, no. 5 (October 2010): 1070–78. http://dx.doi.org/10.1109/jmems.2010.2067430.
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Satoh, Daisuke, Shuji Tanaka, and Masayoshi Esashi. "Electrostatically Controlled, Pneumatically Actuated Microvalve with Low Pressure Loss." IEEJ Transactions on Electrical and Electronic Engineering 3, no. 3 (2008): 305–12. http://dx.doi.org/10.1002/tee.20271.
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Trumper, D. L., and J. H. Lang. "An Electronically Controlled Pressure Regulator." Journal of Dynamic Systems, Measurement, and Control 111, no. 1 (March 1, 1989): 75–82. http://dx.doi.org/10.1115/1.3153021.
Повний текст джерелаАнотація:
This paper describes the analysis, design, implementation, and evaluation of an electronically controlled fluid back-pressure regulator system. The control scheme is unique in that it is purely electronic, and employs a nested pair of feedback loops. This approach overcomes several problems associated with purely mechanical regulation, such as friction in the control valve. Further, since the control is electronic, compensation functions are easily implemented via operational amplifier circuits. The pressure control system is derived with classical control techniques through linearization of the measured valve characteristics. The solutions to nonlinear problems encountered in the implementation are discussed. The design achieves good performance and stability over the entire pressure and flow operating regime.
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Robert, R., P. Micheau, O. Avoine, B. Beaudry, A. Beaulieu, and H. Walti. "A Regulator for Pressure-Controlled Total-Liquid Ventilation." IEEE Transactions on Biomedical Engineering 57, no. 9 (September 2010): 2267–76. http://dx.doi.org/10.1109/tbme.2009.2031096.
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Barth,, Eric J., Jianlong Zhang, and, and Michael Goldfarb. "Control Design for Relative Stability in a PWM-Controlled Pneumatic System." Journal of Dynamic Systems, Measurement, and Control 125, no. 3 (September 1, 2003): 504–8. http://dx.doi.org/10.1115/1.1591810.
Повний текст джерелаАнотація:
This paper presents a control design methodology that provides a prescribed degree of stability robustness for plants characterized by discontinuous (i.e., switching) dynamics. The proposed control methodology transforms a discontinuous switching model into a linear continuous equivalent model, so that loop-shaping methods may be utilized to provide a prescribed degree of stability robustness. The approach is specifically targeted at pneumatically actuated servo systems that are controlled by solenoid valves and do not incorporate pressure sensors. Experimental demonstration of the approach validates model equivalence and demonstrates good tracking performance.
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Aishan, Yusufu, Yaxiaer Yalikun, and Yo Tanaka. "Pneumatically Actuated Thin Glass Microlens for On-Chip Multi-Magnification Observations." Actuators 9, no. 3 (August 23, 2020): 73. http://dx.doi.org/10.3390/act9030073.
Повний текст джерелаАнотація:
This paper presents a self-contained micro-optical system that is magnification-controlled by adjusting the positions of the microlens in the device via pneumatic air pressure. Unlike conventional dynamic microlenses made from a liquid or polydimethylsiloxane (PDMS) that change their shapes via external actuation, this system combines a fixed-curvature glass microlens, an inflatable PDMS layer, and the external pneumatic air pressure supply as an actuator. This device showed several advantages, including stable inflation, firm structure, and light weight; it achieved a larger displacement using the glass microlens structure than has been reported before. This fixed-curvature microlens was made from 120 µm-thick flat thin glass slides, and the system magnification was manipulated by the deflection of a 100 µm-thick PDMS layer to alter the distance from the microlens to the microfluidic channel. The system magnification power was proportional to the air pressure applied to the device, and with a 2.5 mbar air pressure supply, a 2.2X magnification was achieved. This optical system is ideal for combining with high resolving power microscopy for various short working distance observation tasks, and it is especially beneficial for various chip-based analyses.
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Hassan, Waseem, Hwangil Kim, Aishwari Talhan, and Seokhee Jeon. "A Pneumatically-Actuated Mouse for Delivering Multimodal Haptic Feedback." Applied Sciences 10, no. 16 (August 13, 2020): 5611. http://dx.doi.org/10.3390/app10165611.
Повний текст джерелаАнотація:
Most of the information a user obtains through a computer is visual and/or auditory. Providing synchronized haptic information in addition to visual and/or auditory information can significantly enhance user experience and perception of virtual objects. In this paper, we propose a pneumatically-controlled haptic mouse that can replace a conventional computer mouse and deliver multimodal haptic feedback using a single end-effector. The haptic mouse can deliver distinct haptic feedback, i.e., static pressure, high frequency vibrations, and impact response. It has a dual-layered silicone housing with two air chambers. The outer layer is stretchable, and when pumped with air, changes in size and delivers feedback directly to the hand. The inner layer is non-stretchable, and is used to hold the form of the haptic mouse. Various experiments were conducted to quantify the characteristics of haptic mouse. The haptic mouse can generate a static pressure of up to 0.6 Gs, vibrations up to 250 Hz, and provides a max actuation delay of 23 ms. Based on those characteristics, haptic geometry and texture rendering algorithms were developed. These algorithms were used to render virtual shapes and textures and were evaluated using a psychophysical experiment. The results show that participants were able to successfully identify the geometries and textures in most cases.
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Hashem, Mohammad Shadman, Joolekha Bibi Joolee, Waseem Hassan, and Seokhee Jeon. "Soft Pneumatic Fingertip Actuator Incorporating a Dual Air Chamber to Generate Multi-Mode Simultaneous Tactile Feedback." Applied Sciences 12, no. 1 (December 24, 2021): 175. http://dx.doi.org/10.3390/app12010175.
Повний текст джерелаАнотація:
A complete set of diverse haptic feedbacks is essential for a highly realistic and immersive virtual environment. In this sense, a multi-mode haptic interface that simultaneously generates multiple kinds of haptic signals is highly desirable. In this paper, we propose a new silicone-made pneumatically controlled fingertip actuator to render pressure and vibrotactile feedback concurrently to offer a realistic and effective haptic sensation. A new silicone-based stacked dual-layer air chamber was designed. The volume of the chambers is controlled by pneumatic valves with compressed air tanks. The top/upper air chamber renders vibration feedback, whereas the bottom/lower air chamber renders pressure feedback. The proposed silicone-made fingertip actuator is designed so that it can be easily worn at the fingertips. To demonstrate the potential of the system, a virtual environment for rendering three different types of haptic textures was implemented. Extensive performance evaluation and user studies were carried out to demonstrate the proposed actuator’s effectiveness compared to an actuator with single vibrotactile feedback.
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Xu, De Fu, Ping Dong, Jun Fan, and Shu Jun Guo. "The Dynamics Calculations and Research of Electronically Controlled Water Distribution Device." Key Engineering Materials 522 (August 2012): 342–46. http://dx.doi.org/10.4028/www.scientific.net/kem.522.342.
Повний текст джерелаАнотація:
There are four fluid flows in the water regulator of injection wells the first the second the third and the forth backwash flow.The four fluid flows are used to injection and backwash petroleum wells.Based on the reliability of the water regulator under the high-pressured high speed fluid's function.By using fluent software for the numerical analysis and fluid dynamics,get the velocity and pressure field contours and the cloud chart,under the high pressure and high velocity effect. Meanwhile analysis the results.It is provide a theoretical basis for the optimization of the structure of water distribution device.
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Dindorf, Ryszard, and Piotr Wos. "Analysis of the Possibilities of Using a Driver’s Brain Activity to Pneumatically Actuate a Secondary Foot Brake Pedal." Actuators 9, no. 3 (July 1, 2020): 49. http://dx.doi.org/10.3390/act9030049.
Повний текст джерелаАнотація:
The study deals with the use of the driver’s brain activity for wireless remote control of the pneumatic actuator exerting pressure on the secondary foot brake pedal. The conducted experimental tests confirm that bioelectrical signals (BES) induced by muscle tension within the head can be used for wireless remote control of a pneumatic actuator to exert a pressure force on a foot brake pedal for disabled drivers during car emergency braking. It has been shown that the BES artefacts generated by muscular tension inside the head (e.g., movement of the face and eyelids, clenching of jaws, and pressing the tongue on the palate) are the easiest to control of the pneumatic systems. The proposed car braking assistance system controlled by the driver’s brain activity can improve the driving safety of disabled people, e.g., by reducing the reaction time of pneumatically assisted emergency braking.
Дисертації з теми "Pneumatically controlled pressure regulator"
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Шевченко, Сергій Андрійович. "Удосконалення пневмосистеми запуску ракетних двигунів шляхом стабілізації тиску робочого тіла та поліпшення її динамічних характеристик". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29030.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017.
Дисертація присвячена дослідженню вдосконаленої пневмосистеми багаторазового запуску маршового рідинного ракетного двигуна верхнього ступеня ракети-носія. Система запуску, яка містить частину пневмоблока двигуна, здійснює розкручування турбонасосного агрегату за рахунок подачі стисненого гелію на його турбіну. Особливістю системи є використання регулятора тиску гелію із пневмокеруванням. Розроблений й реалізований у практиці проектування новий комплекс дискретно-континуальних математичних моделей для газодинамічного розрахунку цієї пневмосистеми, а також аналізу сил тертя й витоків газу у фторопластових манжетних ущільненнях регуляторів. Запропоновано новий розрахунковий метод дослідження пневмосистеми, що проектується, на динамічну стійкість. Досліджені газодинамічні характеристики металлорукава. Розроблено нову концепцію й впроваджено конструкцію лабораторного стенда, що дозволяє економити гелій при доводочних випробуваннях системи. Виконано розрахунково-експериментальне дослідження пневмосистеми, а його рекомендації зі зміни параметрів регулятора, що знижують коливальність і поліпшують інші динамічні характеристики, впроваджені на двигуні.The thesis for the scientific degree of the Candidate of Technical Sciences by specialty 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The dissertation describes research of perfected pneumatic starting system of a main restartable liquid-propellant rocket engine destined for a launch vehicle upper stage. The starting system, which structure includes a part of the engine pneumatic unit, performs turbopump spin-up by supplying compressed helium to its turbine. A feature of the system is application of a pneumatically controlled helium pressure regulator. New complex of discrete-continual mathematical models is developed and implemented in the designing practice for the gas-dynamic analysis of this pneumatic system and analysis of friction forces and gas leaks through fluoroplastic lip-type seals of regulators. New computational method is proposed for the developed system’s dynamic stability research. The gas-dynamic characteristics of a metal hose are researched. New concept of the laboratory stand is developed and implemented to enable helium saving at development tests. Experimental-computational research of the pneumatic system is performed, recommendations of which are introduced into the engine in relation to the regulator parameters reducing oscillations and improving other dynamic characteristics.
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Шевченко, Сергей Андреевич. "Усовершенствование пневмосистемы запуска ракетных двигателей путём стабилизации давления рабочего тела и улучшения её динамических характеристик". Thesis, Государственное предприятие "Конструкторское бюро "Южное" им. М. К. Янгеля", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29036.
Повний текст джерелаАнотація:
Диссертация на соискание ученой степени кандидата технических наук по специальности 05.05.17 – гидравлические машины и гидропневмоагрегаты. – Национальный технический университет "Харьковский политехнический институт". – Харьков, 2017.
Диссертация посвящена исследованию усовершенствованной пневмосистемы многократного запуска маршевого жидкостного ракетного двигателя верхней ступени ракеты-носителя с насосной подачей компонентов топлива в камеру сгорания. Система запуска, в состав которой входит часть пневмоблока двигателя, осуществляет раскрутку турбонасосного агрегата за счет подачи сжатого гелия из шаробаллона на турбину. Особенностью системы является использование регулятора давления гелия с пневмоуправлением. Исследованная система обеспечивает пять включений двигателя РД861К при идентичных импульсах давления подачи газа, имеющих прямоугольную вершину и предельно крутые фронты. Разработан и использован в практике проектирования новый комплекс дискретно-континуальных математических моделей для газодинамического расчета этой пневмосистемы, а также анализа сил трения и утечек газа во фторопластовых манжетных уплотнениях регуляторов. В моделях учтены новые эффекты: теплообмен газа со стенками полостей и трубопроводов; инерционность газа при его выпуске из баллона; фактор сжимаемости гелия; нагрев гелия при дросселировании; проникновение уплотняемого давления в зазор между манжетой и стенкой, и ряд других. После чего отклонение расчетных значений давления газа от результатов огневых испытаний составило менее 1% Создана и реализована расчетная методика исследования пневмосистемы на динамическую устойчивость и автоколебания. В методике использованы уточненные результаты гармонической линеаризации для колебаний расхода газа через дроссель и силы трения в манжете, а также новый метод расчета импеданса разветвленной системы трубопроводов. Выведено трансцендентное уравнение для частот и амплитуд свободных нелинейных колебаний системы и предложены методы его решения. Точность определения частот автоколебаний составила 2%. Получены аналитические соотношения для параметров пневмосистемы, обеспечивающие динамическую устойчивость или автоколебания малой амплитуды. Исследованы газодинамические характеристики металлорукава, используемого в дренажной системе лабораторного стенда для исследования и настройки системы. Разработана новая концепция и внедрена конструкция стенда, позволяющая экономить гелий при доводочных испытаниях системы. Выполнено расчетно-экспериментальное исследование системы, а его рекомендации по изменению параметров регулятора, снижающие колебательность и улучшающие другие динамические характеристики, внедрены на двигателе.The thesis for the scientific degree of the Candidate of Technical Sciences by specialty 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The dissertation describes research of perfected pneumatic starting system of a main restartable liquid-propellant rocket engine destined for a launch vehicle upper stage. The starting system, which structure includes a part of the engine pneumatic unit, performs turbopump spin-up by supplying compressed helium to its turbine. A feature of the system is application of a pneumatically controlled helium pressure regulator. New complex of discrete-continual mathematical models is developed and implemented in the designing practice for the gas-dynamic analysis of this pneumatic system and analysis of friction forces and gas leaks through fluoroplastic lip-type seals of regulators. New computational method is proposed for the developed system’s dynamic stability research. The gas-dynamic characteristics of a metal hose are researched. New concept of the laboratory stand is developed and implemented to enable helium saving at development tests. Experimental-computational research of the pneumatic system is performed, recommendations of which are introduced into the engine in relation to the regulator parameters reducing oscillations and improving other dynamic characteristics.
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Vule, Reljić. "Даљинско управљање дигиталном пнеуматиком у концепту Индустрије 4.0". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114446&source=NDLTD&language=en.
Повний текст джерелаАнотація:
У овој докторској дисертацији, акценат је стављен на анализу даљинскиуправљаних дигиталних пнеуматских система у концепту Индустрије 4.0.Доприноси тезе су сљедећи: 1) Показано је на који начин је могуће, постојећепнеуматске системе надградити тако да се омогући даљинско управљањекретањем пнеуматских радних елемената, даљинска регулација притиска идаљинска регулација протока. 2) Показано је на који начин је могуће развитидаљински управљан дигитални пнеуматски систем, који има могућностдаљинске промјене управљачких параметара (радног притиска и/илипротока) у току процеса рада, и који је искључиво софтверскиреконфигурабилан, те реализован на оптималан начин, чиме достиже нивофлексибилности потребан да се задовољи основни концепт Индустрије 4.0.Примјена добијених резултата могућа је у свим индустријским, а потом инеиндустријским системима, у којима постоје пнеуматски радни елементи.U ovoj doktorskoj disertaciji, akcenat je stavljen na analizu daljinskiupravljanih digitalnih pneumatskih sistema u konceptu Industrije 4.0.Doprinosi teze su sljedeći: 1) Pokazano je na koji način je moguće, postojećepneumatske sisteme nadgraditi tako da se omogući daljinsko upravljanjekretanjem pneumatskih radnih elemenata, daljinska regulacija pritiska idaljinska regulacija protoka. 2) Pokazano je na koji način je moguće razvitidaljinski upravljan digitalni pneumatski sistem, koji ima mogućnostdaljinske promjene upravljačkih parametara (radnog pritiska i/iliprotoka) u toku procesa rada, i koji je isključivo softverskirekonfigurabilan, te realizovan na optimalan način, čime dostiže nivofleksibilnosti potreban da se zadovolji osnovni koncept Industrije 4.0.Primjena dobijenih rezultata moguća je u svim industrijskim, a potom ineindustrijskim sistemima, u kojima postoje pneumatski radni elementi.
In this PhD thesis, the emphasis is placed on the analysis of remotelycontrolled digital pneumatic systems in the scope of Industry 4.0. Thecontributions of the thesis are the following: 1) The possibility of upgrading anexisting pneumatic systems to allow remote motion control of pneumaticactuators, remote pressure control and remote flow control, is shown. 2) Thepossibility of developing a remotely controlled digital pneumatic system, whichhas the ability of remote change of the control parameters (the operatingpressure and/or the flow) during the operating process, and which isexclusively software reconfigurable and optimally implemented, is shown. Atthat way, it is achieving a level of flexibility needed to meet the basic conceptof Industry 4.0. The application of the obtained results is possible in allindustrial and then non-industrial systems, where pneumatic actuators exist.
Частини книг з теми "Pneumatically controlled pressure regulator"
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Reljić, Vule, Petar Knežević, Dragan Šešlija, and Slobodan Dudić. "Improving the Energy Efficiency of Pneumatic Control Systems by Using Remotely-Controlled Pressure Regulator." In Proceedings on 18th International Conference on Industrial Systems – IS’20, 135–42. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97947-8_18.
Повний текст джерелаТези доповідей конференцій з теми "Pneumatically controlled pressure regulator"
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Prabhakaran, V., M. Ashmi, S. Jayaraj, and K. S. Sivanandan. "Design of a controller for the pneumatic flow control valve and pressure regulation for application related to pneumatically powered orthosis." In 2016 International Conference on Information Communication and Embedded Systems (ICICES). IEEE, 2016. http://dx.doi.org/10.1109/icices.2016.7518837.
Повний текст джерела
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Delenne, Bruno, and Laurent Mode. "Modeling and Simulation of Pressure Oscillations in a Gas Pressure Regulator." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1980.
Повний текст джерелаАнотація:
Abstract Pressure stability on gas networks is a major concern for designers and operators of Gaz de France transmission and distribution networks. Pressure level is controlled by pressure regulators. To improve the process control and optimise the design of pressure regulating stations (PRS), experimental and numerical studies have been carried out by the Research and Development Division. The purpose of this paper is to provide an analytical model for pilot controlled gas pressure regulators and to determine the operating conditions that avoiding oscillating pressure regime. Frequency and amplitude of the oscillations depend on many parameters such as flow rate, inlet and outlet pressure mean levels, the downstream volume size, the length of the sensing line or diameter of the outlet pipe. Particular attention is required to represent pressure loss and flow dynamics in pipes and process lines. The model has been developed under the ALLAN.® Simulation environment, a general software for the description and simulation of dynamic systems. It turned out from simulations and measurements that the upstream pressure and the volume of the downstream buffer are very sensitive parameters that influence amplitude and frequency. From a qualitative point of view, numerical and experimental results are in good agreement.
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Kumar, Nithin S., Mark E. Hofacker, and Eric J. Barth. "Design of a Stirling Thermocompressor for a Pneumatically Actuated Ankle-Foot Orthosis." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3995.
Повний текст джерелаАнотація:
This paper presents the design, modeling, and simulated performance of a prototype Stirling thermocompressor. The thermocompressor is intended to be mounted on the back of a user’s lower leg and convert a hydrocarbon fuel source into 50 W of pneumatic power at 650 kPa to power an ankle foot orthosis. Consisting only of a displacer piston, the Stirling thermocompressor’s displacer piston motion is directly controlled by a brushless DC motor so that the frequency of operation can be tuned to output the maximum power. Simulation indicates that this operating frequency is influenced by the intended reservoir pressure and heat transfer properties of the thermocompressor.
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Krause, Jeremy, and Pranav Bhounsule. "Variable Position and Force Control of a Pneumatically Actuated Knee Joint." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67394.
Повний текст джерелаАнотація:
Pneumatically powered prostheses have the ability to restore function and improve the quality of life by providing external power, thus decreasing human effort. However, such prostheses are expensive because they use high performance servo valves and complex control systems. To overcome this limitation, a pneumatic actuator is retrofitted with cheap solenoid valves and controlled by pulse width modulation for continuous control. High fidelity control is achieved by using a negative displacement configuration in which pressure is released on one side to create motion. The performance of the system is demonstrated using a series of position, force control experiments and ability to withstand external impulses. The pneumatic system is cheap, has high repeatability, and accuracy. The main limitation is that the speed of response is much slower than a positive displacement system but better design of the solenoid valve and use of predictive control has the potential to alleviate this issue.
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San Andre´s, Luis, and Keun Ryu. "Hybrid Gas Bearings With Controlled Supply Pressure to Eliminate Rotor Vibrations While Crossing System Critical Speeds." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50393.
Повний текст джерелаАнотація:
Micro-turbomachinery (MTM) implements gas bearings in compact units of enhanced mechanical reliability. Gas bearings, however, have little damping and wear quickly during transient rub events. Flexure pivot tilting pad bearings offer little or no cross-coupled stiffnesses with enhanced rotordynamic stability; and when modified for hydrostatic pressurization, demonstrate superior rotordynamic performance over other bearing types. External pressurization stiffens gas bearings thus increasing system critical speeds, albeit reducing system damping. Most importantly, measurements demonstrate that external pressurization is not needed for rotor super critical speed operation. In practice, the supply pressure could be shut off at high rotor speeds with substantial gains in efficiency. The paper introduces a simple strategy, employing an inexpensive air pressure regulator to control the supply pressure into the hybrid bearings, to reduce or even eliminate high amplitudes of rotor motion while crossing the system critical speeds. Rotor speed coast-down tests with the pressure controller demonstrate the effectiveness of the proposed approach. A simple on-off supply pressure control, i.e. a sudden increase in pressure while approaching a critical speed, is the best since it changes abruptly the bearing stiffness coefficients and moves the system critical speed to a higher speed. A rotordynamic analysis integrating predicted bearing force coefficients forwards critical speeds in agreement with the test results. Predicted rotor responses for the controlled supply conditions show an excellent correlation with measured data. The experiments validate the predictive tools and demonstrate the controllable rotordynamic characteristics of flexure pivot hybrid gas bearings.
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Lu, Yenwen, and Chang-Jin Kim. "Characterization of Balloon-Jointed Micro-Fingers." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41326.
Повний текст джерелаАнотація:
A micro-finger structure articulated by pneumatically controlled micro balloon joints is characterized for its force capability. The micro-finger, being developed as a building component for future micro-robotics, is made of thick (>100 μm) silicon segments closely jointed by micro balloons made of Parylene thin film. The thick silicon structure and the small gap in between provide strength and stiffness that are desirable in micro-robots. The force characterization of the microfingers, obtained from a simple experimental setup, demonstrates that the micro-finger can apply 1.2 mN force at 60 psi pneumatic actuation. The effective stiffness of the micro-finger is also obtained. The increasing stiffness under higher pressure suggests that the micro-fingers can exert stronger force by increasing pressure, showing the advantage of the active grasping mechanism.
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Ryan, Robert G., and Jeffrey Bunting. "An Experimental Investigation of a Temperature Controlled Vapor Supply System." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63806.
Повний текст джерелаАнотація:
A variety of applications require a constant pressure vapor supply for processes such as purging fluid systems. A typical design would use a high pressure tank of gas (e.g. helium) along with a mechanical pressure regulator to deliver a constant pressure flow. An alternative concept for the vapor source is to use a tank containing a saturated liquid-vapor mixture. As the vapor is drawn off of the top of the tank, the temperature of the mixture is controlled to maintain the desired vapor delivery pressure. The potential advantage of this approach is that the vapor supply system can be designed to be lighter, more compact, and safer. An experiment was designed to test the practicality of this concept in a small scale system. Carbon dioxide was chosen for the saturated mixture due to its availability, safety, and desirable operating pressures near ambient temperature levels. The apparatus was designed to allow for the measurement of relevant temperatures and pressures over a range of vapor delivery flow rates. Temperature control of the supply tank was accomplished by submergence in an ice bath. The experimental results confirm that this type of system can produce a well regulated vapor supply at low flow rates, but fails to produce steady pressures at higher delivery flows due to limitations of the heat transfer process in the supply tank.
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Brown, Samuel J., Eldon Husband, and Jerry L. Lyons. "Testing and Risk Analysis are Key Elements of Post Construction Problem Solving: A Case History of System Failure and Fire Hazards." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71303.
Повний текст джерелаАнотація:
Hazardous thermal hydraulic loading conditions and unintended plant shut downs from turbine trips that are identified shortly after a plant start up may be the tip of the iceberg of even greater interrelated hazards and costly damages. This paper presents a case study to further illustrate (from ASME PVP2002-1124 paper) additional considerations for the testing and risk analysis to identify a systematic approach to reduce the hazards and risks of equipment failure from thermal hydraulic forces and secondary hazards (such as fires) to the plant and personnel. This paper examines problems of turbine trip caused by fuel computer controlled regulator valves that results in thermal hydraulic forces from compressor pressure wave surges in the process system that result in piping “Y” fitting (45° laterals) failures in the process piping from crack growth and brittle fracture which lead to process chemical release and fires.
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Overton, Leonard L., William E. Masincup, and Jack E. Halsey. "A Mechanical Start System for U. S. Navy Destroyer Generator Sets." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-252.
Повний текст джерелаАнотація:
A mechanical start system has been developed to start the Ship’s Service Gas Turbine Generators (SSGTG) on board U.S. naval destroyers. The current starting system uses either stored high pressure air or bleed air from another running turbine. The U.S. Navy has reviewed the high pressure air system and found it to be a costly system for both ship construction and maintenance. As a result, the Navy is requiring an alternative starting method that will replace high pressure air. It should be noted that any alternative that introduces compressed air to start the SSGTG depends on the start air regulating assembly and the pneumatic starter. The Redundant Independent Mechanical Start System (RIMSS) consists of an Allison Model 250 turboshaft engine mounted above the SSGTG main reduction gearbox. The turboshaft power take off is connected to the pinion shaft of the reduction gearbox by means of a parallel shaft auxiliary transfer gearbox. The transfer gearbox connection to the reduction gearbox replaces the pneumatic starter adapter pad but provides a means to also connect the pneumatic starter. As a result, the pinion shaft can be driven either pneumatically by the air turbine or mechanically by the Model 250 engine. This provides an alternative starting mode which is totally independent of the present means of starting. This will increase the reliability and availability of the SSGTG since it can still be started even if the pressure regulator or the pneumatic starter is not functional. This system has undergone testing at the Naval Surface Warfare Center Carderock Division facility in Philadelphia.
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Bennett, L. G. N., and W. D. E. Allan. "Examination of Rotating Stall Inception in a Small High Speed Axial Compressor." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59420.
Повний текст джерелаАнотація:
Rotating stall is an internal aerodynamic disturbance that limits the performance and operating life of a compressor. It has been studied with the aim of developing techniques for its prediction and prevention. To further the understanding of rotating stall inception, a test rig was constructed with the axial stages of a Rolls Royce Model 250-C20B small, high speed axial compressor as the test article. A gasoline engine was used to power the compressor and airflow was throttled through a pneumatically controlled valve. Simultaneous static pressure measurements were taken with seven high speed transducers arranged in two configurations: distributed both axially and circumferentially around the compressor casing. The compressor characteristic was mapped and detailed pressure measurements were taken between normal and surge operating conditions. Previous studies of high speed multi-stage compressors have shown both modal and spike type stall inception at different compressor stages. Other examinations of the Model 250 compressor have shown stall inception occurring at the first stage of the compressor. Similar results were observed in this study and an analysis was conducted using a variety of signal processing techniques including pressure trace inspection and discrete spatial Fourier decomposition.