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Dissertations / Theses on the topic 'Solenoid Valve'
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1
Angadi, Santosh Vishwanath Jackson Robert Lloyd. "Hydraulic solenoid valve reliability and modeling study." Auburn, Ala, 2008. http://hdl.handle.net/10415/1491.
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Gamble, Jonathan B. "Sliding mode control of a proportional solenoid valve." Thesis, University of Bath, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304385.
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Gadyuchko, Andrey, and Sören Rosenbaum. "Nondestructive quality inspection of solenoid valves." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200756.
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The presented innovative magnetic testing method utilises the fact, that each commercially available electromagnet can not only be used as an actuator, but also comprises internal sensor functions. This allows a huge application variety in the fields of non-destructive testing and condition monitoring of electromagnetic systems during production and within the application in the field.
4
Gällsjö, Anders, and Mattias Johansson. "Physical Modelling and Automatic Configuration of CES Valve." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-79261.
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This thesis has been performed at Öhlins Racing AB which is known world-wide for its high quality racing shock absorbers. Öhlins have been developing shock absorbers for more than 30 years and in addition to this they also develop a technology for semi-active suspension. Semi-active suspension technology makes it possible to achieve an intelligent and dynamic vehicle chassis control. Compared to standard passive suspensions, semiactive dampers allow improving vehicle cornering performance while still providing good comfort when cruising. This is achieved by a real time adjustment of the suspensions damping characteristics. Öhlins system for semi-active suspension is called CES (Continuously controlled Electronic Suspension). The systems consist of electronically controlled hydraulic valves for uniflow dampers. These valves are mounted on all four dampers of the vehicle and are controlled individually to provide the desired ride quality. The valves are configurable to suit many types of vehicles by changing internal parts. The first goal of this thesis project was to study the behaviour of the CES valve and uniflow damper. In order to achieve this a simulation model was created using Hopsan which is a 1-dimensional multi-domain modelling tool developed at the division of Fluid and Mechatronic Systems at Linköping University. The model considers mechanical forces from for example springs together with hydraulic forces. It was validated against static and dynamic measurements made in a flow bench and a dynamometer. The second goal was to use the simulation model as part of a tool that configures the CES valve according to a requirements specification. To achieve this goal a method of estimating the characteristics of the internal damper valves was developed. This estimation method, together with the simulation model, was used to choose the best valve configuration by using weighted least-squares. The result is presented in a Matlab-based graphical user interface.
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Keprt, Jaroslav. "Bezsensorové polohové řízení solenoidu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241834.
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This thesis deals with the determination of the position of the solenoid core in real time based on the measured current. The reference position of the current is used for feedback control of the solenoid. For this issue, software tool Matlab/Simulink was used. For current and temperature measurements, PCB circuits were created. The whole project was carried out on the dSPACE platform.
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Happel, Julius, René Schnetzler, and Markus Laufenberg. "Multistable valve technology with magnetic shape memory alloy as passive element activated by a bidirectional solenoid actuator." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71264.
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Magnetic Shape Memory (MSM) alloys show a superelastic behaviour with possible deformation rates up to 6% until 12% and a sufficient lifetime performance [1, 2]. In this paper, a passive application for a superelastic Ni-Mn-Ga-alloy is presented by using the MSM element as an accurately defined inner friction in a system of a multistable actuator, in particular a multistable proportional valve. The multistable valve is characterized by a currentless holding of the valve displacement in any position of the stroke. This circumstance makes the concept a very low energy consumption valve, compared to conventional proportional valves with solenoid actuators. The new aspect of a rigid connection of MSM Materials enables an absorption of tension as well as compressive forces. To realize an applicable controlling valve, a simple and effective controlling strategy has been implemented. Due to the stabilizing effect of the MSM element, an accurate controlling of the valve stroke and the usage for example as a pressure-, mass-flow or temperature-controlling valve was made possible. Furthermore, some potential applications in pneumatics as well as in hydraulics are presented.
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Håkansson, Klas, and Mikael Johansson. "Modeling and Control of an Electro-Pneumatic Actuator System Using On/Off Valves." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8754.
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To control the exhaust gas recirculation (EGR) and the exhaust brake, the position of a butterfly valve connected to a piston inside a pneumatic cylinder is controlled by altering the pressure inside the cylinder. This thesis evaluates the possibility to do this with pulse width modulation (PWM) controlled On/Off valves. The whole electro-pneumatic actuator system is built out of two On/Off valves and a cylinder.
A mathematical model of the system is constructed. The complete system model on state space form consists of nine states and is nonlinear. The model captures the dynamics of the system. The statics of the system is not captured as accurately. The model is still good enough to be used as aid when developing control strategies, since position feedback is available.
Automatic control strategies for the system are first developed and tested in simulation. The first approach is PID control. Because of the nonlinear properties of the system the results from a PID with a constant proportional part is unsatisfactory. To cope with the nonlinearities, a fuzzy controller is constructed; the results prove somewhat better, but not as good as expected due to implementation difficulties.
In a test bench the system is controlled by a P controller with feedforward from position. The feedforward strongly reduces the nonlinear behavior of the system. With this implementation the results that were hoped for with the fuzzy controller are reached.
8
Žižlavský, Vít. "Návrh konstrukce rychlého elektromagnetického ventilu semiaktivního tlumiče." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444296.
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This diploma thesis’s focuses on the mechanical design of fast solenoid throttle valve for DCC semiactive damper. Current DCC dampers work with a time response of over 10 ms, which is not suitable for fast semiactive control of vehicle chassis. The time response needs to be shortened, to improve quality of regulation. The required time response is archived by new fast electromagnetic actuator for original CES valve. The actuator has been accelerated by reducing induction of eddy currents and by reducing weight of moving parts. New valve helped to reduce the time response of damper by 28 % to 8,1 ms. The results proved, that the time response is affected more by speed of the servo effect, which is closing main orifice, than by electromagnetic actuator. There is no more potential in accelerating CES valve by actuator.
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Sharma, Akhil. "A New Multiple Input Random Excitation Technique Utilizing Pneumatic Cylinders." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470671978.
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Ellwein, Christian. "Vibration based fault detection for Solenoid valves." Thesis, Northumbria University, 2002. http://nrl.northumbria.ac.uk/236/.
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Solenoid valves play a vital role in many machines and systems. If one of these devices breaks down the whole system can be affected. Because of this importance of valves, it is desirable to observe these parts to detect faults, both when they are occurring and before they can cause serious damage. Among several possible methods of observation (monitoring actuation time, electrical current, fluidic parameters and others) the observation of mechanical vibrations is a well known method of observing mechanical systems which is commonly used for observation of rotating machinery, but which includes several challenges for diagnosis of solenoid valves. This thesis investigates the possibilities and advantages of vibration analysis of fault detection for solenoid valves. New algorithms are developed to automatically segment the overall non- stationary raw data to smaller sections with a higher degree of stationarity. These new segments are interpretable in a mechanical sense and they separate different sources of vibration. Furthermore a new method to detect regions of interest in a spectrum for classification without "a priori knowledge" about the process has been developed. The experiments presented in this thesis give the evidence that these new methods of pre¬processing and feature extraction enable reliable classification results for transient signals as they occur in the vibration of a switching valve.
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Alaya, Oussama, and Maik Fiedler. "Optimal pressure control using switching solenoid valves." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200545.
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This paper presents the mathematical modeling and the design of an optimal pressure tracking controller for an often used setup in pneumatic applications. Two pneumatic chambers are connected with a pneumatic tube. The pressure in the second chamber is to be controlled using two switching valves connected to the first chamber and based on the pressure measurement in the first chamber. The optimal control problem is formulated and solved using the MPC framework. The designed controller shows good tracking quality, while fulfilling hard constraints, like maintaining the pressure below a given upper bound.
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Steinsland, Vidar. "Modeling and Control of Retarder using On/Off Solenoid Valves." Thesis, KTH, Reglerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105880.
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The Retarder is one of the main components in Scania's trucks' braking system and is used to brake down the truck and for maintaining a steady speed on descents. This Master's Thesis aims to investigate if the current system which uses a proportional valve to control the air pressure in the Retarder, can be replaced with two on/o® solenoid valves and a pressure chamber to control the air pressure, which would result in a cheaper and more robust system. By varying the air pressure, the braking torque in the truck can be regulated. A model including electrical drives from a control unit, valves, pressure chamber and a regulating valve is derived. Using the model as reference, a controller is designed and implemented to control the valves, and thereby the pressure. Based on experience from employees at Scania and former research on on/o® control of an Exhaust Gas Recirculation system, a regular PID-controller is used as the base in the control. A pulsing scheme where the valves are activated separately is used to distribute the control signal to the two valves. Di®erent ways of applying the control signal are investigated, whether the valves run digital, i.e. 0 % or 100 %, or continuously by varying the PWM signal. A boosting action using non-linear control, and prediction are investigated in order to improve the control performance in such way that the required time response and robustness is obtained. The controller is eventually tested and veri¯ed on the real system.
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Jeddi, Tehrani Maisam. "Pressure Control of a Pneumatic Actuator Using On/O Solenoid Valves." Thesis, KTH, Reglerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105878.
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Nowadays a very important aspect in heavy duty vehicles is the braking system. The braking system can be divided into EBS brakes, exhaust brake and retarder, where the latter is of interest in the present Master's Thesis. This thesis presents an investigation whether it is possible to substitute today's concept, i.e. controlling the air pressure to the retarder using a proportional-valve, with two so-called on/o®-valves and a pressure sensor, which will reduce expenses and contingently hysteresis phenomena seen in the current system. A non-linear model of the Electronic Control Unit (ECU) electrical drives, and the electrical, magnetic, mechanical, and pneumatic parts of the valves, is designed. A Proportional-Integral-Derivative (PID)-controller is designed based on the derived model. Two di®erent pulsing schemes have been investigated. However, just one of the approaches together with the results from the other one is presented in this thesis. In order to improve the control performance non-linear control and prediction methods are used so that required time response and robustness is achieved. Finally the modelled current and pressure are validated against the measured data, and a verification of the controller is done on the prototypes.
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Tan, Phay Kiat 1974. "Three dimensional printing : solenoid value-jet for continuous high-speed application." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9262.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.Includes bibliographical references (leaves 130-131).
3D Printing is the rapid prototyping of parts by the deposition of a binder material in successive layers onto specific regions of a powder substrate. The current challenge in 3 DP(TM) is the demand for larger built-volume in a shorter time with a high level operational reliability. The solenoid valve-jet printhead possesses key characteristics, which can be used in the design of a scaled-up 3 DP(TM) machine. An experimental study was conducted on the performance of the solenoid valve jet under variable pressure and operational frequency. A flow-rate of 5cm 3/min is obtainable at a pressure of 10psi. A linear relationship is observed between pressure and fluid flow-rate, with an upper operational limit of 25psi. An individual valve-jet evaluated is capable of producing fluid stream with a variability of ± 0.01 mm on the front edge and ± 0.1 mm on the trailing edge. A build time of 4.5 hours, with a single valve-jet printing water into PVA load stainless steel powder as the material system, is required for a volume of 150x300x30 mm with the bulk of time taken by the drying process. Continuous 5 days run of a valve-jet indicate very little deterioration in performance with a flow-rate variance of ±0.2cm 3/min over the test duration. A printhead made up of two valve-jets printing bidirectionally was able to produce geometrical parts but with stepped edges caused the performance variability between different valve-jets. Each solenoid valve-jet needs to be calibrated offline and those with similar capabilities can be put together onto a single printhead. These experimental results indicate that an array of solenoid valve-jet can be assembled into the printhead of a larger scaled-up 3 DP(TM) machine to fabricate larger and accurate parts with minimal maintenance and low risks of failure.
by Phay Kiat Tan.
S.M.
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Eyabi, Peter B. "Modeling and sensorless control of solenoidal actuator." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1054142598.
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Lin, Jia-Ming, and 林家銘. "Design and Implementation of Proportional solenoid for gasoline solenoid valve." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61707582479582870345.
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碩士雲林科技大學
機械工程系碩士班
96
Gasoline solenoid valve was applied to the gasoline industry for a long time, especially the design of gasoline solenoid valve that uses proportional solenoid. Because the price of international crude oil continues to increase and the oil price was always expensive, so the accuracy of gasoline’s measurement is cared by everyone. At this time, the gasoline solenoid valve plays an important role. This research cooperate with Delta electronics, Inc. It discuss the solenoid analysis and improve the design of ASCO gasoline solenoid valve, including the use of the finite element method (FEM) to analyze the geometric of solenoid, plunger angle, the characteristics of materials and physical parameter. Three ideas was proposed to improve the design. Further more, the improvement of the accuracy and decrease the leakage of gasoline was achieved by combining with PWM circuit. Finally, from the simulation results, it is shown that the design of steady and lower cost product is successful.
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Cai, Ming-syuan, and 蔡名軒. "Design of the Energy-Saving Hydraulic Solenoid Valve and Cartridge Valve." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/14581503901617024472.
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碩士國立雲林科技大學
機械工程系碩士班
99
Hydraulic components and systems can be found in many industrial fields, like the mobile equipments, automation machinery, etc. Recently, green technology has been attracting the attention of many researchers around the world. In the field of fluid power, many new ideas have been proposed to increase the energy-saving efficiency during past few years. The aim of this research is to develop a brand new energy-saving hydraulic solenoid valve and cartridge valve. As a first step, a traditional solenoid valve and logic valve are chosen and a mesh-system are created. Secondly, the new CFD-RC software is used to create mesh system, and then to perform the simulation. A simplified CFD model is also developed, which shows that the total flow force in the tested valve with the new spool or poppet is successfully reduced because of the design of the recirculation land or notch. Finally, from the experimental results, it is confirmed that the design goal of energy-saving is successfully achieved.
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Chen, Cheng-Fu, and 陳建富. "The Analysis and Application of Micro-solenoid Valve." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/35314471527956468613.
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碩士臺灣大學
應用力學研究所
98
In recent years, the valves are essential component in microfluidic devices and micro-total-analysis-system. In general, the micro-solenoid valve was made of magnetic materials and the external magnets was applied to attract or repel squeeze the membrane. Based on the squeeze through the chamber, the thickness of membrane is the key factor about the moving behavior of the micro-solenoid valve. However, in the microchannel with high aspect ratio, the deformation of membrane can not be used to achieve the valve moving. The planar valve and enameled wire used to build the microfluidic devices were presented in this study. The magnetic field to drive the present planar micro-solenoid valve was generated by enameled wires. The polarity of iron microvalve can be attracted or repelled by magnetic. The currents were applied to control the opening and closing of the micro-solenoid valve. In addition, the measurements of the net force and hysteresis curves from valve motion. According to the experimental results, the magnetic induction will produce 14.7 Gauss to drive the valve with the load current of the coil is 0.4A. From the analysis results of the hysteresis curve, the magnetic induction by valve is 7.0 Gauss when the loading current is 0.9A. The residual magnetism and coercive force are 0.4 Gauss and 0.005 A/m, respectively. The moving behaviors of the microvalve were measured by the high-speed CCD. The period of opened and closed is 0.005 second when two coils are loading in different phase of 0.9A square wave. Furthermore, the present valve can obstruct most of fluid and change fluidic direction slightly with the background flow is 15μL/hr.
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Geng, Chi-Yu, and 耿啟育. "Mathematical modeling and analysis of pneumatic solenoid valve." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/vz26gv.
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碩士國立屏東科技大學
車輛工程系所
105
The main purpose of this research is to study the mathematical modeling of solenoid valve and, through the comparison with experiment results, to verify the validity of the dynamic model. Based on the derived model, the complex dynamic behavior of pneumatic solenoid valves can be described by some simple equations which can give constructive suggestions in design and manufacturing of solenoid valves. Via computer simulations for the dynamic model, the dominant parameters which significantly affect the responses can be found accordingly. In this research, the dynamics of the solenoid valve are separated into four parts, namely, the first part is electric dynamics, the second part is magnetic dynamics, the third part is armature motion dynamics, and the last part is pneumatic dynamics. The simulation results will be compared with the results from experiments. Finally, this research will give the simulations in different conditions so that the restricted condition of these parameters can be obtained.
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Haung, Yu-Song, and 黃昱菘. "Dynamic Flowfield Analysis of a Pneumatic Solenoid Valve." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/grpc5m.
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碩士國立臺灣科技大學
機械工程系
106
This research presents an unsteady simulation of CFD effort to realize and estimate the pressure-rising characteristics of a 3/2-way pneumatic solenoid valve, which is used extensively in activating the anti-lock braking system (ABS). The actual pressure-rising action of solenoid valve is accomplished by executing the armature-moving process and the pressure-filling process. At first, the open mode of solenoid valve in ABS is reached by moving the armature to its lowest position, which can block the ventilating holes and the flow leakage completely. Also, a space between the armature and the nozzle is created for allowing the high-pressure air to fill the valve system, which has been reported in previous literatures. Clearly, the course of armature movement is an extremely quick transient process and forms a time-consuming and problematic CFD challenge, which is thus ignored usually. However, the flow pattern at the end of armature movement is the initial condition for activating the actual pressure-charging process. Therefore, this work intends to firstly perform the transient simulation on the armature-moving process to understand the physical phenomenon in details and obtain the correct initial condition for the succeeding pressure-filling process. In addition, the real-gas relation is implemented in all numerical calculations executed here to ensure the accurate and reliable numerical results. As a result, the transient flow analysis on the entire pressure-charging action indicates that a repeating pressure-oscillation phenomenon exists inside the region between the iron core and the nozzle exit at the original armature speed (0.133 m/s). From the numerical flow visualization, it is found that this fluctuation is contributed to the cyclic resistance on the incoming air mainly generated by the large flow circulation existed between the iron core and the nozzle exit, in which a rapid and huge volume change is induced by the moving armature. Also, the amplitude of pressure perturbation diminishes quickly after six fluctuating cycles since the volume-variation effect becomes smaller as the armature moves away from the nozzle. As regard to the pressure-responding estimation of this solenoid valve, CFD calculations show that 876 ms and 752 ms are needed to reach 75% of the activation pressure from present and old approaches, respectively. Apparently, the deviation percentage is significantly improved from 21.7% to 8.9% based on the actual test data (961 ms). Furthermore, it is demonstrated that the moving speed of armature has significant influence on the pressure-fluctuation phenomenon and the resulting pressure-rise time needed for this ABS valve. Thus, the unsteady analysis on different armature speeds (0.100 m/s and 0.166 m/s) is carried out to find its corresponding pressure responding time of this valve. The numerical calculations indicate that cycle number and perturbed amplitude of the pressure fluctuation increase for a higher armature speed while no improvement on the responding time is observed. Besides, this result implies that the moving velocity of armature is an important design factor, which can be optimized systematically with the aids of CFD tool. In conclusion, this investigation successfully establishes a rigorous and systematic CFD scheme to reveal the physical mechanism in details and accurately estimate the pressure-rise characteristics of a 3/2-way pneumatic solenoid valve.
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Lin, Yu-Min, and 林郁民. "Flowfield Analysis of a 3/2 Solenoid Valve." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/7mg64m.
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碩士國立臺灣科技大學
機械工程系
105
Pneumatic solenoid valve has been widely used in the vehicle control systems for meeting the rapid-reaction demand triggered by the dynamic conditions encountered during the driving course of vehicle. For ensuring the safety of human being, the reliable and effective solenoid valve is in great demand to shorten the reaction time and thus becomes the topic of this research. This numerical study chooses a commercial 3/2-way solenoid valve as the reference valve for analyzing its performance. At first, CFD software Fluent is adopted to simulate the steady flow field associated with the valve configuration. Then, the comprehensive flow visualization is implemented to identify the locations of adverse flow patterns, which are critical for proposing the improving alternatives. Accordingly, it is found that a high-pressure region exists in the region between the nozzle exit and the top of spool. Thereafter, a parametric study on the nozzle diameter and the distance between nozzle and spool top is imposed to understand their influences on the pressure response characteristics of valve. Moreover, the unsteady CFD simulation is carried out on the electromagnetic valve to attain the transient characteristics for estimating the pressure response time, which will be compared with international Tier-1 standard later. Consequently, this numerical analysis shows that the pressure response time is reduced for an increasing nozzle diameter and an enlarged distance between the nozzle and the spool. Also, all the valve designs considered here meet with the standard of Tier 1. In conclusion, this work successfully establishes a rigorous and systematic CFD scheme, combined the steady and unsteady simulations, to evaluate the performance of pneumatic solenoid valve. Also, it provides the important information regarding the key design parameters of solenoid valve.
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張銘崑. "Pneumatic position control using on-off solenoid valve." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/73838415573815789642.
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Parvate-Patil, Girish. "Solenoid operated variable valve timing for internal combustion engines." Thesis, 2005. http://spectrum.library.concordia.ca/8415/1/MR04425.pdf.
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In internal combustion engines, particularly for spark ignition (SI) engines, valve events and their timings put forth a major influence on the engine overall efficiency and its exhaust emissions. By using variable valve timing (VVT) technology it is possible to control the valve lift, phase, and valve timing at any point on the engine map, in order to enhance the engine overall performance. In this study, effects of variable valve timing strategies on gasoline and diesel engines are discussed and analyzed. Also the static characteristics of a solenoid incorporating a permanent magnet as its core are developed, and validated with experiments. The permanent magnet core solenoid is novel in that a single electromagnet can provide bi-direction motion of the core motion. Its application to VVT can provide infinite position control and timing, force control such as to reduce impact forces, and latching capabilities, providing a novel actuator to the automotive industry
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Kao, Tien-Chia, and 高添佳. "Designing a power-saving and high efficient solenoid valve." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/16857680422115803803.
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碩士國立雲林科技大學
機械工程技術研究所
87
Solenoid valves is one of the most important elements and is widely used in the field of Automation-Technology. The flow force,which acts in the solenoid valves, is an important factor of consumption power. it is,however, neglected in the traditional productions. Therefore,It is a worthwhile to research and develop solenoid valves which have high efficiency and power-saving. At the present, there are few foreign producers of solenoid valves who work merely on the theory research; however, it is still a strange field in the domestic and there are only few researchers working on the studies of solenoid valves. This report reveals that by the basic practice and experiment we can develop the power-saving and high efficient solenoid valves. Firstly, using the UNIC soft ware to analyze the compensation of flow force.Secondly,according to the analysis result, to design the best solenoid valves. Finally, finishing the saving-power design by the accuracy experiment of flow force compensation. The process of the study to compensate flow force is as follow: 1. Choose a traditional solenoid valves and create a mesh-system on the inner. 2. Use the UNIC soft ware to make the mesh chart, and then to perform it as the term. 3. By the tecplot conversion, getting the flow press chart and the program of result.dat. 4. Go through the data file( result.dat )to get the pressure, then from the pressure-data to find the result of compensation of flow force,and furthermore to evaluate the ratio of saved-power. Finally,from theoratic analysis,the saved power-consumption amounts roughly17.8 ﹪,which agrees well with the experimental result(the saved power-consumption amounts roughly 25﹪).
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楊介雋. "A pneumatic isolation system using on-off solenoid valve." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/62440559401932026710.
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"Estimating Parameters of a Proportional Solenoid Valve using Neural Networks." Thesis, 2001. http://hdl.handle.net/10388/7084.
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Many control schemes, simple or sophisticated, utilize high performance electro-hydraulic components as an interface to mechanical hardware. Failure of an electro-hydraulic component in these applications may impact safety, maintenance schedules and/or productivity of the overall operation. A condition monitoring scheme that would measure the performance or health of critical electro-hydraulic components would be desirable in addressing the above mentioned concerns.
A neural network approach in estimating on-line proportional solenoid valve parameters is the focus of this study. A neural network algorithm is well suited for this type of parameter estimation in that it is capable of learning and best fitting a solution to given data. It is also capable of handling inherent noise in sensor data and is simple enough to allow for non-complex processing. Some of the parameters that affect the performance of the main stage valve spool which may be used in a condition monitoring scheme include orifice area gradient, spring rates, spring pre-compressions and spool friction.
This thesis considers the use of individual neuron structures to estimate each valve
parameter. Each neuron trains to a specific valve parameter with its output being the estimated parameter's main spool force contribution. The individual neurons act and train independently; however, their outputs are integrated to compute the main spool differential pressure. This differential pressure calculation is compared to the measured value and the difference is used to train each neural structure.
The neural algorithm was found to be quite capable of estimating simulated valve
parameters. When applied to experimental data, the neural algorithm estimated comparable main spool valve parameters to results from other studies conducted at the University of Saskatchewan. In all, it was determined that the neural algorithm was capable of estimating accurate and repeatable valve parameters, which reveals the feasibility of the parameter estimation procedure.
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Jiang, Bo-Ying, and 江柏穎. "Surveillance System for Hydraulic Solenoid Valve with Intelligent Wireless Bluetooth Communication." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/32hen7.
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碩士國立雲林科技大學
機械工程系
107
With the advance of science and technology, The concept of industry 4.0 and the Internet of Things (IoT) can be seen everywhere. The development of network communication has became wireless as time went by. The important technologies in automated manufacturing factory are not only, the system that can save and transform the Big Data, but also the device with powerful calculating algorithm. The advantages of hydraulic system are high-power, high-efficiency and small-size. Therefore, it is used in modern heavy industry and automation system widely. The core unit of the hydraulic system is a hydraulic solenoid valve. The common types are directional control valve proportional control valve, both of them can be used to control hydraulic cylinder movement. This paper, combines the microcontroller with the integrated circuit to form a module, which transmits wireless signals through Bluetooth and communicates with intelligent handheld device. Two different experiments are conducted to test on hydraulic system in this paper. They are open-loop system and surveillance system. The open-loop system can control the motion of hydraulic cylinder by the intelligent handheld device. The surveillance system monitors the states of solenoid valves also by the handheld device. The solenoid valves can stop in dangerous situation avoid component damage, which can also be analyzed and saved in the database. At last, this paper achieved the goals of Wireless communication, Intelligent control, Data access and Data analysis successfully by reducing the dimension of surveillance module and being installed in solenoid valve body.
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Tsai, Ming-Chih, and 蔡明志. "Applied CFD simulation and Taguchi method to analyze for solenoid valve designs." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/g5y6cx.
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碩士崑山科技大學
機械工程研究所
97
Altering the design parameters of a solenoid valve to meet the customer’s request is usually to urge a factory to develop their new products. In this study, Taguchi method is used to analyze the affected parameters of valve function and performance, to reduce the experimental complexities, and to increase the reliability of simulations. In order to utilize a computer simulation instead of the try and error method is provided the efficiency and economical procedure to accomplish the object of requirement. It applied the Computational Fluid Dynamic software (CFD) to simulate characteristics of fluid flow inner the valve. Base on the requirement, during different input pressure retains the output for a constant flow volume; the results show that appropriate setting for the inside diameters of output pipe and flow regulator is the most significant parameters on solenoid valve designing.
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Chien, Kuo Cheng, and 簡國政. "Process Improvement through Six Sigma Methodology-The Solenoid for Electromagnetic Valve Application." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/14549374985082593269.
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碩士華梵大學
工業管理學系碩士班
93
Abstract This research follows the DMAIC principles used in six-sigma management to resolve issues involving airlift cost. This is due to the insufficient quality level of components from suppliers. The airlift cost is a result to meet the customers expected delivery date. Through the Pareto chart, the ‘A Core’ component is defined as the primary component for improvement. The macro map and detailed process map of A Core component are then deployed. During the measuring stage, the assembly process for A Core and pin components is found as the key process by the cause-and-effect matrix. The analysis of measuring system identified that the variations of data collected are primarily from the parts. In the analysis stage, the cutting temperature, material of cutting tool and parts hardness are major factors influencing the process quality. Finally, a factorial experimental design is conducted to determine the optimal process parameters. The process capability is then calculated and followed by continuously monitoring the process through the SPC chart. A saving of US$59,046 per year is finally achieved.
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Jhe-Wei-Syu and 許哲維. "Design and Analysis of Energy-saving Pneumatic Solenoid Valve with Flow-force Compensation." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/68492292719322769006.
Full textAbstract:
碩士國立雲林科技大學
機械工程系
103
Pneumatic Solenoid Valve is an electromagnetic element which can convert electromagnetic energy into mechanical energy .It is broadly used in many industrial fields, such as the automation machinery, etc. it’s principle is utilizing electromagnetic coil excitation to generate electromagnetic force, and then this force pushes the valve spool inside the valve body to produce displacement. While power supply interrupts, the valve spool will be pulled to the neutral position by a spring at the other end, sequentially complete the open (ON) or closed (OFF) function. Currently, in domestic pneumatic electromagnetic valves, the energy loss resulting from flow resistance are almost not considered, which is generated by the high-pressure gas flowing through the valve chamber. They don’t have energy-saving characteristics. In recent years, the global energy depletion is also forcing many countries to invest a lot of manpower and resources to develop energy-saving technology .In view of this, this paper will talk about the further improvement of the flow resistance generated by the traditional pneumatic solenoid valve chamber ,so as to save energy. The research task is divided into two parts. the first part is the simulation analysis of the application of CFD. The analysis result is used to redesign the type of valve spool outflow and inflow’s geometric appearance. Finally to achieve the goal of designing an energy saving with flow force compensation. The second part is using the best result of CFD simulation to manufacture valve spool, and to test and calculate the error value between the preliminary simulation number value and the final experimental result error value.Lastly, the minimum operating pressure produced with LabVIEW graphical program was used to test the experimental platform. In addition, FESTO proportional pressure valve was used to accurately control pressure output and operate instruments, including SMC pressure switch and pressure sensor, to measure the minimum operating pressure of valve spool displacement. Thus, the specific energy-saving efficiency of the flow force compensation design using valve shafts was calculated.
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Qiu, Ji-Cheng, and 邱繼承. "Modeling and Position Control of the High-speed Solenoid Valve for Petrochemical Industry." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/94222363590836576417.
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KE, NAIN-PING, and 柯念平. "The application of model reference adaptive control to a solenoid valve control hydraulic system." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/07506625624831936797.
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Lu, Chia-Hua, and 呂嘉華. "Application of CFDRC to the design of high pressure solenoid valve and advanced non-contacting vacuum pad." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/99670741233724919118.
Full textAbstract:
碩士雲林科技大學
機械工程系碩士班
96
The main purpose of this study is to investigate the simulation, design and application high pressure solenoid valve and vacuum pad by using CFDRC software, respectively. For hydraulic high pressure solenoid valve, the flow force which acts in the solenoid valves is an important factor concerning the consumption power. However, it is neglected in the traditional productions. Therefore, we discussed and analyzed the solenoid valve with the disturbance of flow force in solenoid valve. Further, I tried to solve the problem of the solenoid valve unable to switch for pressure higher than 10000 psi and improved the design of the solenoid valve. Secondly, we discussed the pneumatic vacuum pad. Our laboratory abandoned conventional method that produced the vacuum effect by a vacuum pump. However, we produce the vacuum effect by supplying air into the vacuum pad. But the research bottleneck was the unavoidable collision. In order to improve the perfermance, in this study, we used the principle aerostatic bearing with orifice-type restrictor, and simulated the design of advanced non-contacting vacuum pad. Finally, from experimental results, we overcame the problem of unavoidable collision.
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Nien, Wen-Chung, and 粘文鐘. "Computer Aided Design and Analysis of Explosion-proof Solenoid Valves." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/59922746583119171358.
Full textAbstract:
碩士國立臺灣大學
生物產業機電工程學研究所
92
In order to investigate the characteristics of explosion-proof solenoid valves tools, computer aided design and analysis were applied in this study. Based on a explosion-proof solenoid valve (NASS BV 4984), a virtual valve was designed by using the I-DEAS software. In the analysis of the anti-explosion structure of the valve, the ANSYS software for finite element analysis was used to find out the variations of stress, temperature, and magnetic flux. The ANSYS software was used for establishment of a finite element model with discrete grids to get solutions related to its physical conditions. Then, those solutions were compared with respective standards to check if they meet those safety requirements. The results obtained from ANSYS simulation model were compared with the actual conditions from the NASS valve. Then, the model was rerun by changing its parameters continually until the difference between ANSYS data and preset values were within an acceptable limit. At last, a reasonable type of valves obtained from modeling may provide a relatively reliable basis for valve designs.
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Hou, Hung-Lin, and 侯宏霖. "The Design and Development of a Fast Inspection Device for Solenoid Valves." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/72066753506426179449.
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Fan, Sheng-Wei, and 范聖尉. "Reliability Assessment of Key Mechanical Components of Solenoid Valves in Low Temperature Environments." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hk433x.
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碩士國立交通大學
工學院精密與自動化工程學程
107
The purpose of this research is to set up the techniques for the reliability analysis of solenoid valve key components in the low temperature environment. The composition of a solenoid valve, the materials of the important components, and working conditions are introduced. The failure mode and effects analyses of both the system and the important components are performed. A method is then presented to assess the reliabilities of the system and its components. The dimensions, material constants, load, and deformation of important components were measured in experiments in room temperature and the measured data were quantitatively analyzed. The experimental data were used to determine the statistical characteristics of the relevant design parameters. The finite element code ANSYS was used to analyze the deformation of the tower spring. The accuracy of the ANSYS tower spring model and the correctness of the formula derivation are verified using the experimental data. The ANSYS tower spring model together with the empirical formulas is used to analyze the mechanical and fatigue behaviors of the important components such as springs and gaskets in the low temperature environment; set up the limit state equations of for the failure modes of destruction and fatigue of the springs and gaskets; apply the reliability model of series system; perform the reliability assessment of the solenoid valve with multiple failure modes. Finally, the strength-stress interference theory together with the probability distributions of the design parameters is used to estimate the reliabilities of the solenoid valve and its critical components under low temperature condition for the life of one million cycles. It has been shown that the reliability analysis can produce good estimations of the reliabilities of the key components of solenoid values.
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Jhou, Shunyi, and 周順億. "The Feasibility Analysis of Relief Control for Turbochargers by Installing of Fast Solenoid Valves." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/74474443699899694917.
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碩士南開科技大學
車輛與機電產業研究所
100
This paper presents the method of relief control for turbochargers. We install a fast solenoid valve on the piping between the actuator of the turbocharger and the intake manifold of the engine. By changing the period and duty cycle of the power supply, we control the solenoid to open the valve and change the air flow direction. This method only allows part of the compressed air into the actuator. Therefore, before pressure decreases followed by the actuator opening, we allow the pressure in intake manifold to achieve the expectations of boost, which is over the set pressure of the original manufacturer. It can promote supercharged performance of the air aspiration. Under the appropriate conditions of the power period and duty cycle, the results show that this method can effectively lower down outlet pressure of the actuator to the expected pressure range. Furthermore, in the transient response time for depressurizing to the target pressure, the higher input pressure requires the longer reaction time. The longer power period results in the shorter transient response time.
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Jia-Da, Wu, and 吳佳達. "Thermal Stress Analysis for Nd:YAG Laser Welding of High Precision Solenoid Valves in Hydraulic Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/21360385930952740677.
Full textAbstract:
碩士國立屏東科技大學
車輛工程系所
95
In the manufacturing process of laser welding of high precision solenoid valves in hydraulic systems, cracks will occur at the sleeve due to a large thermal stress during welding. This study investigated into the above-mentioned problem by changing the pulse repetition frequency, overlap ratio of spot, pulse duration and welding position. The simulation results showed that the thermal stress will be reduced by increasing the preheating effect deduced by increasing the pulse repetition frequency, overlap ratio of spot, pulse duration. When welding position is nearer the bottom of sleeve, a large thermal stress will be caused because of severe temperature variation. On the contrary, when welding position is farther form the bottom of sleeve, the thermal stress will be reduced significantly, and avoid occurring the crack during welding.