Zeitschriftenartikel: „Control algorithm for directional control valves“

1

Jin, Liyang, und Qingfeng Wang. „Positioning control of hydraulic cylinder with unknown friction using on/off directional control valve“. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 232, Nr. 8 (11.05.2018): 983–93. http://dx.doi.org/10.1177/0959651818771522.

Der volle Inhalt der Quelle

Annotation:

In this study, a prediction-based positioning control scheme is proposed for the hydraulic cylinder controlled by a solenoid operated on/off directional control valve. The discrete-valued input, low switching frequency and significant delay of directional control valve make the control problem very complex. Only a discrete-valued control input can be used here; meanwhile, the input has switching frequency constraint and time-delay. Existing methods such as pulse-width modulation control and sliding-mode control are not suitable for this problem, because chattering may arise due to the control input restrictions. The newly proposed prediction-based positioning control scheme consists of two parts: a switching law based on predictions of future states and learning algorithms which learn required predictive models online. According to accurate predictions, the switching law can control the hydraulic cylinder to target position in an optimal way, and chattering is avoided. Meanwhile, the required predictive models are identified by a generalized growing and pruning for radial basis function network and a recursive least square estimation algorithm in real time. Essentially, the problems caused by input restrictions, time-delay and model uncertainty are solved by the accurate identifications to some well-designed models. The control scheme is verified by physical experiments. Fast and accurate positioning control can be achieved for the hydraulic cylinder with unknown nonlinear friction.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

2

Li, Songjing. „OPTIMAL DESIGN OF NEW TYPE ENERGY-SAVING SOLENOID DIRECTIONAL CONTROL VALVE USING GENETIC ALGORITHM“. Chinese Journal of Mechanical Engineering 37, Nr. 07 (2001): 79. http://dx.doi.org/10.3901/jme.2001.07.079.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

3

Bobál, Vladimír, Petr Chalupa, Marek Kubalčík und Petr Dostál. „Self-Tuning Predictive Control of Nonlinear Servo-Motor“. Journal of Electrical Engineering 61, Nr. 6 (01.11.2010): 365–72. http://dx.doi.org/10.2478/v10187-010-0056-x.

Der volle Inhalt der Quelle

Annotation:

Self-Tuning Predictive Control of Nonlinear Servo-MotorThe paper is focused on a design of a self-tuning predictive model control (STMPC) algorithm and its application to a control of a laboratory servo motor. The model predictive control algorithm considers constraints of a manipulated variable. An ARX model is used in the identification part of the self-tuning controller and its parameters are recursively estimated using the recursive least squares method with the directional forgetting. The control algorithm is based on the Generalised Predictive Control (GPC) method and the optimization was realized by minimization of a quadratic and absolute values objective functions. A recursive control algorithm was designed for computation of individual predictions by incorporating a receding horizon principle. Proposed predictive controllers were verified by a real-time control of highly nonlinear laboratory model — Amira DR300.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

4

Astik, Mitesh B., Praghnesh Bhatt und Bhavesh R. Bhalja. „Bi-Directional Position and Speed Estimation Algorithm for Sensorless Control of BLDC Motor“. Electrical, Control and Communication Engineering 14, Nr. 2 (01.12.2018): 125–33. http://dx.doi.org/10.2478/ecce-2018-0015.

Der volle Inhalt der Quelle

Annotation:

AbstractThe observer design for estimation of back EMF to control the Brushless DC (BLDC) motor is proposed in this paper. Rotor position of the BLDC motor is estimated using the sequence of estimated back EMF. During speed reversal of motor, the actual and estimated values of speed fail to track the reference speed and if corrective action is not taken by the observer, the motor goes into the unstable region. To overcome this problem, the speed estimation algorithm is proposed for BLDC motor control during its speed reversal operation. Infinite Impulse Response (IIR) Butterworth first order low-pass filters are used in the observer for smoothing the estimated back EMFs of the BLDC motor. A new controller scheme based on Modified Hybrid Fuzzy PI (MHFPI) controller is proposed to control the speed of the BLDC motor. The effectiveness of the proposed method has been validated through simulations for different disturbances such as step changes in the reference speed and load torque of the motor and results are compared with the existing methods.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

5

Li, Sheng Zhong, Jian Xin Liu und Yi Fei Xia. „The Pneumatic Position Control System Based on Fuzzy-PID“. Applied Mechanics and Materials 488-489 (Januar 2014): 1142–45. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.1142.

Der volle Inhalt der Quelle

Annotation:

Put forward a kind of control system to achieve precise positioning of the pneumatic cylinder, coring to PC upper monitor and using Visual C++ as the development platform. Establish an experimental platform of pneumatic cylinder positioning control system: selecting the parameter self-tuning Fuzzy-PID control algorithm, using the proportional directional control valve, standard cylinder, displacement sensordata acquisition card and other components. the use of MATLAB to simulate and optimize, carry out the actual experiment on the basis of simulation. The experimental results proved the effectiveness and correctness of Fuzzy PID in pneumatic control system.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

6

Shin, Byoung-Ho, Doo Yong Choi, Kwansue Jung und Zong Woo Geem. „Valve Location Method for Evaluating Drain Efficiency in Water Transmission Pipelines“. Water 12, Nr. 10 (03.10.2020): 2759. http://dx.doi.org/10.3390/w12102759.

Der volle Inhalt der Quelle

Annotation:

Water transmission pipelines, which transport bulk water into storage facilities, usually have a tree-type configuration with large dimensions; thus, the breakage of a pipeline may cause a catastrophic service interruption to customers. Although drain efficiency is closely related to the number of washout and control valves and their locations, there is no useful guideline. This paper proposes a valve locating method by introducing numerical analyses to enumerate drainage time and zone. A time integration method, combined with the Newton–Raphson algorithm, is suggested to resolve drainage time, while considering the friction loss in gravitational flow. A drain direction matrix, which shows drain direction and coverage, is derived using a network searching algorithm. Furthermore, a feasible practical approach is presented by introducing a critical horizontal slope, a major washout valve, drainage indices, and control valve embedment. The developed method is first applied to simple pipes to validate the drainage time module. Subsequently, the model is expanded to the CY transmission line, which is one of the BR water supply systems in South Korea currently in operation. The results reveal that three drain valve locations have been neglected, and the addition of control valves guarantees consistent drain time below the operational criteria.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

7

Janky, Kristen L., Jessie N. Patterson, Neil T. Shepard, Megan L. A. Thomas und Julie A. Honaker. „Effects of Device on Video Head Impulse Test (vHIT) Gain“. Journal of the American Academy of Audiology 28, Nr. 09 (Oktober 2017): 778–85. http://dx.doi.org/10.3766/jaaa.16138.

Der volle Inhalt der Quelle

Annotation:

AbstractNumerous video head impulse test (vHIT) devices are available commercially; however, gain is not calculated uniformly. An evaluation of these devices/algorithms in healthy controls and patients with vestibular loss is necessary for comparing and synthesizing work that utilizes different devices and gain calculations.Using three commercially available vHIT devices/algorithms, the purpose of the present study was to compare: (1) horizontal canal vHIT gain among devices/algorithms in normal control subjects; (2) the effects of age on vHIT gain for each device/algorithm in normal control subjects; and (3) the clinical performance of horizontal canal vHIT gain between devices/algorithms for differentiating normal versus abnormal vestibular function.Prospective.Sixty-one normal control adult subjects (range 20–78) and eleven adults with unilateral or bilateral vestibular loss (range 32–79).vHIT was administered using three different devices/algorithms, randomized in order, for each subject on the same day: (1) Impulse (Otometrics, Schaumberg, IL; monocular eye recording, right eye only; using area under the curve gain), (2) EyeSeeCam (Interacoustics, Denmark; monocular eye recording, left eye only; using instantaneous gain), and (3) VisualEyes (MicroMedical, Chatham, IL, binocular eye recording; using position gain).There was a significant mean difference in vHIT gain among devices/algorithms for both the normal control and vestibular loss groups. vHIT gain was significantly larger in the ipsilateral direction of the eye used to measure gain; however, in spite of the significant mean differences in vHIT gain among devices/algorithms and the significant directional bias, classification of “normal” versus “abnormal” gain is consistent across all compared devices/algorithms, with the exception of instantaneous gain at 40 msec. There was not an effect of age on vHIT gain up to 78 years regardless of the device/algorithm.These findings support that vHIT gain is significantly different between devices/algorithms, suggesting that care should be taken when making direct comparisons of absolute gain values between devices/algorithms.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

8

Sefat, Morteza Haghighat, Khafiz M. Muradov, Ahmed H. Elsheikh und David R. Davies. „Proactive Optimization of Intelligent-Well Production Using Stochastic Gradient-Based Algorithms“. SPE Reservoir Evaluation & Engineering 19, Nr. 02 (06.01.2016): 239–52. http://dx.doi.org/10.2118/178918-pa.

Der volle Inhalt der Quelle

Annotation:

Summary The popularity of intelligent wells (I-wells), which provide layer-by-layer monitoring and control capability of production and injection, is growing. However, the number of available techniques for optimal control of I-wells is limited (Sarma et al. 2006; Alghareeb et al. 2009; Almeida et al. 2010; Grebenkin and Davies 2012). Currently, most of the I-wells that are equipped with interval control valves (ICVs) are operated to enhance the current production and to resolve problems associated with breakthrough of the unfavorable phase. This reactive strategy is unlikely to deliver the long-term optimum production. On the other side, the proactive-control strategy of I-wells, with its ambition to provide the optimum control for the entire well's production life, has the potential to maximize the cumulative oil production. This strategy, however, results in a high-dimensional, nonlinear, and constrained optimization problem. This study provides guidelines on selecting a suitable proactive optimization approach, by use of state-of-the-art stochastic gradient-approximation algorithms. A suitable optimization approach increases the practicality of proactive optimization for real field models under uncertain operational and subsurface conditions. We evaluate the simultaneous-perturbation stochastic approximation (SPSA) method (Spall 1992) and the ensemble-based optimization (EnOpt) method (Chen et al. 2009). In addition, we present a new derivation of the EnOpt by use of the concept of directional derivatives. The numerical results show that both SPSA and EnOpt methods can provide a fast solution to a large-scale and multiple I-well proactive optimization problem. A criterion for tuning the algorithms is proposed and the performance of both methods is compared for several test cases. The used methodology for estimating the gradient is shown to affect the application area of each algorithm. SPSA provides a rough estimate of the gradient and performs better in search environments, characterized by several local optima, especially with a large ensemble size. EnOpt was found to provide a smoother estimation of the gradient, resulting in a more-robust algorithm to the choice of the tuning parameters, and a better performance with a small ensemble size. Moreover, the final optimum operation obtained by EnOpt is smoother. Finally, the obtained criteria are used to perform proactive optimization of ICVs in a real field.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

9

Jensen, Konrad Johan, Morten Kjeld Ebbesen und Michael Rygaard Hansen. „Development of Point-to-Point Path Control in Actuator Space for Hydraulic Knuckle Boom Crane“. Actuators 9, Nr. 2 (09.04.2020): 27. http://dx.doi.org/10.3390/act9020027.

Der volle Inhalt der Quelle

Annotation:

This paper presents a novel method for point-to-point path control for a hydraulic knuckle boom crane. The developed path control algorithm differs from previous solutions by operating in the actuator space instead of the joint space or Cartesian space of the crane. By operating in actuator space, almost all the parameters and constraints of the system become either linear or constant, which greatly reduces the complexity of both the control algorithm and path generator. For a given starting point and endpoint, the motion for each actuator is minimized compared to other methods. This ensures that any change in direction of motion is avoided, thereby greatly minimizing fatigue, jerky motion, and energy consumption. However, where other methods may move the tool-point in a straight line from start to end, the method in actuator space will not. In addition, when working in actuator space in combination with pressure-compensated control valves, there is no need for linearization of the system or feedback linearization due to the linear relationship between the control signal and the actuator velocities. The proposed solution has been tested on a physical system and shows good setpoint tracking and minimal oscillations.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

10

Khadim, Qasim, Mehran Kiani-Oshtorjani, Suraj Jaiswal, Marko K. Matikainen und Aki Mikkola. „Estimating the Characteristic Curve of a Directional Control Valve in a Combined Multibody and Hydraulic System Using an Augmented Discrete Extended Kalman Filter“. Sensors 21, Nr. 15 (24.07.2021): 5029. http://dx.doi.org/10.3390/s21155029.

Der volle Inhalt der Quelle

Annotation:

The estimation of the parameters of a simulation model such that the model’s behaviour matches closely with reality can be a cumbersome task. This is due to the fact that a number of model parameters cannot be directly measured, and such parameters might change during the course of operation in a real system. Friction between different machine components is one example of these parameters. This can be due to a number of reasons, such as wear. Nevertheless, if one is able to accurately define all necessary parameters, essential information about the performance of the system machinery can be acquired. This information can be, in turn, utilised for product-specific tuning or predictive maintenance. To estimate parameters, the augmented discrete extended Kalman filter with a curve fitting method can be used, as demonstrated in this paper. In this study, the proposed estimation algorithm is applied to estimate the characteristic curves of a directional control valve in a four-bar mechanism actuated by a fluid power system. The mechanism is modelled by using the double-step semi-recursive multibody formulation, whereas the fluid power system under study is modelled by employing the lumped fluid theory. In practise, the characteristic curves of a directional control valve is described by three to six data control points of a third-order B-spline curve in the augmented discrete extended Kalman filter. The results demonstrate that the highly non-linear unknown characteristic curves can be estimated by using the proposed parameter estimation algorithm. It is also demonstrated that the root mean square error associated with the estimation of the characteristic curve is 0.08% with respect to the real model. In addition, all the errors in the estimated states and parameters of the system are within the 95% confidence interval. The estimation of the characteristic curve in a hydraulic valve can provide essential information for performance monitoring and maintenance applications.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

11

Shan, Wenjuan, und Bing Liu. „Multidimensional Interpolation Decoupling Strategy for CD Basis Weight of Papermaking Process“. Symmetry 12, Nr. 1 (10.01.2020): 149. http://dx.doi.org/10.3390/sym12010149.

Der volle Inhalt der Quelle

Annotation:

With a focus on the multivariable coupling characteristics in a cross-directional (CD) basis weight control system, we study the coupling characteristics of a CD control system and decoupling control, and we propose a novel multivariable interpolation decoupling control strategy and a real-time decomposition algorithm in this paper. Based on a model of the CD basis weight profile, a system non-square interaction matrix of high-dimensional data is analyzed by experimental studies and numerical simulation. Along the diagonal of the interaction matrix, the matrix block method is adopted to reduce the system dimension and convert it into a square system. A multivariable control system with high dimensionality is divided into several subsystems. For the high-dimensional Toeplitz symmetric subsystem with small-scale coupling characteristics, an interpolation decoupling algorithm is proposed. Then, a decoupling compensator with the structure of a symmetric Toeplitz matrix was obtained. Compared with the conventional diagonal decoupling matrix, the branch number of the new decoupling network is reduced from 2408 to 186, which realizes the fast decoupling of multivariable systems. The results were even better when we used a double size interaction matrix obtained by interpolation between actual values. By designing the diagonalized controller for the new decoupled system, a decouped CD control system for corrugated paper with a basis weight of 133 g/m2 was implemented in an actual project in a paper mill.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

12

Dutta, Nabanita, Kaliannan Palanisamy, Umashankar Subramaniam, Sanjeevikumar Padmanaban, Jens Bo Holm-Nielsen, Frede Blaabjerg und Dhafer Jaber Almakhles. „Identification of Water Hammering for Centrifugal Pump Drive Systems“. Applied Sciences 10, Nr. 8 (13.04.2020): 2683. http://dx.doi.org/10.3390/app10082683.

Der volle Inhalt der Quelle

Annotation:

Water hammering is a significant problem in pumping systems. It damages the pipelines of the pump drastically and needs to identify with an intelligent method. Various conventional methods such as the method of characteristics and wave attenuation methods are available to identify water hammering problems, and the predictive control method is one of the finest and time-saving methods that can identify the anomalies in the system at an early stage such that the device can be saved from total damage and reduce energy loss. In this research, a machine learning (ML) algorithm has used for a predictive control method for the identification of water hammering problems in a pumping system with the help of simulations and experimental-based works. A linear regression algorithm has been used in this work to predict water hammering problems. The efficiency of the algorithm is almost 90% compared to other ML algorithms. Through a Vib Sensor app-based device at different pressures and flow rates, the velocity of the pumping system, a fluctuation between healthy and faulty conditions, and acceleration value at different times have been collected for experimental analysis. A fault created to analyze a water hammering problem in a pumping system by the sudden closing and opening of the valve. When the valve suddenly closed, the kinetic energy in the system changed to elastic resilience, which created a series of positive and negative wave vibrations in the pipe. The present work concentrates on the water hammering problem of centrifugal pumping AC drive systems. The problem is mainly a pressure surge that occurs in the fluid, due to sudden or forced stops of valves or changes in the direction and momentum of the fluid. Various experimental results based on ML tool and fast Fourier transformation (FFT) analysis are obtained with a Vib Sensor testbed set-up to prove that linear regression analysis is the less time-consuming algorithm for fault detection, irrespective of data size.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

13

Irfan, Muhammad, Abdul Wadood, Tahir Khurshaid, Bakht Muhammad Khan, Ki-Chai Kim, Seung-Ryle Oh und Sang-Bong Rhee. „An Optimized Adaptive Protection Scheme for Numerical and Directional Overcurrent Relay Coordination Using Harris Hawk Optimization“. Energies 14, Nr. 18 (07.09.2021): 5603. http://dx.doi.org/10.3390/en14185603.

Der volle Inhalt der Quelle

Annotation:

The relay coordination problem is of dire importance as it is critical to isolate the faulty portion in a timely way and thus ensure electrical network security and reliability. Meanwhile a relay protection optimization problem is highly constraint and complicated problem to be addressed. To fulfill this purpose, Harris Hawk Optimization (HHO) is adapted to solve the optimization problem for Directional Over-current Relays (DOCRs) and numerical relays. As it is inspired by the intelligent and collegial chasing and preying behavior of hawks for capturing the prey, it shows quite an impressive result for finding the global optimum values. Two decision variables; Time Dial Settings (TDS) and Plug Settings (PS) are chosen as the decision variables for minimization of overall operating time of relays. The proposed algorithm is implemented on three IEEE test systems. In comparison to other state-of-the-art nature inspired and traditional algorithms, the results demonstrate the superiority of HHO.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

14

Paswan, Ramashankar, Jayanta Das, N. Kumar, Ajit Kumar, Santosh Kumar Mishra und Kumar Sujit. „Performance Analysis of Directional Control Valve: An Overview“. Applied Mechanics and Materials 592-594 (Juli 2014): 1983–87. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1983.

Der volle Inhalt der Quelle

Annotation:

Directional control valves start, stop or change the direction of flow in compressed air applications. To understand the different applications of compressed air and how valves are used, one must first have knowledge of the kinds and types of valves used by industries. This paper studies local valve control of the electro-hydraulic system. The slow response of hydraulic control valve usually becomes the hold-up of whole system performance. Although fast valves (e.g. high-bandwidth servo-valves) are available, they are far more expensive than slow valves (e.g. proportional directional control valves). To improve the performance of proportional directional control valves, three different types of controllers are synthesized. Firstly, based on the pole zero cancellation technique, an open loop compensator is designed which requires the accurate valve dynamic model information; Secondly, a full state feedback adaptive robust controller (ARC) is synthesized, which effectively takes into account the effect of parametric uncertainties and uncertain nonlinearities such as friction force and flow force. Finally, an output feedback ARC controller is synthesized to address the problem of un measurable states. Keywords: valve, hydraulic device, Simulink.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

15

Petrović, Dragan, und Vera Cerović. „Hydraulic symbols - part four: Directional control valves“. Poljoprivredna tehnika 44, Nr. 4 (2019): 1–16. http://dx.doi.org/10.5937/poljteh1904001p.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

16

Blasiak, Slawomir, Pawel Andrzej Laski und Jakub Emanuel Takosoglu. „Rapid Prototyping of Pneumatic Directional Control Valves“. Polymers 13, Nr. 9 (30.04.2021): 1458. http://dx.doi.org/10.3390/polym13091458.

Der volle Inhalt der Quelle

Annotation:

The main objective of the study was to design a pneumatic directional control valve for controlling pneumatic drives and produce it using a rapid prototyping technique. As the basic design assumption was to achieve high performance through a high flow rate and a low pressure drop, it was necessary to determine two flow parameters: the sonic conductance and the critical pressure ratio. The flow rate of compressed air and the diameters of the pneumatic conduits and fittings are important as they affect the rate of travel of the pneumatic cylinder piston. The 3D solid model of the directional control valve, developed in a CAD program, was used to simulate and optimize the flow rate. The analysis was performed by means of ANSYS CFX, a computational flow dynamics program. The main elements of the valve, i.e., the spool and the body, were produced using the PolyJet Matrix technology. The prototype was tested experimentally to determine the nominal flow-rate, calculate the flow parameters in accordance with the ISO 6358-1989 standard and compare them with the CFD simulation data. The simulation results showed very good agreement with the measurement data. The CFD analysis of the 3D solid model enabled us to optimize the flow of compressed air through the valve. The rapid prototyping method was found to be suitable to produce a fully functional directional control valve, which was confirmed through measurements at a test stand. The attempt to combine rapid prototyping used to fabricate pneumatic directional control valves with CFD used to simulate their operation was successful. The study shows that it is possible to design and construct a fully functional directional control valve characterized by high efficiency, high performance and a small pressure loss in a very short time and at a very low cost, which makes rapid prototyping superior to conventional methods of prototype making.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

17

Sha, Linxiu, und Zhongqi Pan. „FSQGA based 3D complexity wellbore trajectory optimization“. Oil & Gas Sciences and Technology – Revue d’IFP Energies nouvelles 73 (2018): 79. http://dx.doi.org/10.2516/ogst/2018008.

Der volle Inhalt der Quelle

Annotation:

Determination of the trajectory of a complex wellbore is very challenging due to the variety of possible well types, as well as the numerous complicated drilling variables and constraints. The well type could be directional wells, cluster wells, horizontal wells, extended reach wells, redrilling wells, and complex structure wells, etc. The drilling variables and constraints include wellbore length, inclination hold angles, azimuth angles, dogleg severity, true vertical depths, lateral length, casing setting depths, and true vertical depth. In this paper, we propose and develop an improved computational model based on Fibonacci sequence to adjust the quantum rotation step in quantum genetic algorithm for achieving cost-efficient complex wellbore trajectories. By using Fibonacci sequence based quantum genetic algorithm (FSQGA) in a complex searching problem, we can find high-quality globally optimal solutions with high speed through a parallel process. The simulation results show that FSQGA can significantly reduce computation complexity, and reach minimum objection values faster. Meanwhile, minimization of the true measurement depth of complex wellbore trajectory in actual gas-oil field shows that the drilling cost can be reduced up to 4.65%. We believe this new algorithm has the potential to improve drilling efficiency, to reduce the drilling time and drilling cost in real-time wellbore trajectory control.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

18

TAUTENHAHN, Ralf, und Jürgen WEBER. „Cross-domain tolerance design for directional control valves“. JFPS International Journal of Fluid Power System 11, Nr. 3 (2019): 81–86. http://dx.doi.org/10.5739/jfpsij.11.81.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

19

Salloom, Maher Yahya, und Zahurin Samad. „Design and modeling magnetorheological directional control valve“. Journal of Intelligent Material Systems and Structures 23, Nr. 2 (26.12.2011): 155–67. http://dx.doi.org/10.1177/1045389x11432654.

Der volle Inhalt der Quelle

Annotation:

Directional control valves are designed to control direction of flow, while actuators maintain required speeds and precise positions. Magnetorheological (MR) fluid is a controllable fluid. Utilizing the MR fluid properties, direct interface between magnetic fields and fluid power is possible, without the need for mechanical moving parts like spools. This study proposes a design of a four-way three-position MR directional control valve, presents a method of building, and explains the working principle of the valve. An analysis of the design and finite elements using finite element method of magnetism (FEMM) software was performed on each valve. The magnetic circuit of the MR valve was analyzed and the performance was simulated. The experiment showed the functional working principle of the MR valve. In conclusion, the MR valve proved to be effective in controlling the direction and speed of hydraulic actuators proportionally. The proposed new design has the potential to reduce the complexity of directional control valves in the future.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

20

Xiang, Ming, und Delun Wang. „Conceptual design of the hybrid hydraulic system based on adjacency matrices operations“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, Nr. 7 (11.09.2017): 1179–90. http://dx.doi.org/10.1177/0954406217731117.

Der volle Inhalt der Quelle

Annotation:

This paper presents a new method to describe the selection design of directional control valves in the form of matrix. The directional control valves in hybrid are the basic units to implement the distribution of flow in the hydraulic system. Both the design requirements of the hybrid hydraulic system and the basic units are expressed by the adjacency matrices. Therefore, the selection design of directional control valves is the process to decompose the adjacency matrix of the system into a series of sub-matrices according to the decomposition rules. The defined rules of adjacency matrices are obtained according with the composite physical model of several valves. For obtaining easily the selection design of directional control valves, the library of basic units is established. The style of directional control valves is obtained by matching the sub-matrices with the matrices of basic units. Through configuring the others components, a thorough conceptual design process of the hydraulic system is established. Example is given to illustrate the whole design process in detail.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

21

Del Vescovo, Giuseppe, und Antonio Lippolis. „Three-Dimensional Analysis of Flow Forces on Directional Control Valves“. International Journal of Fluid Power 4, Nr. 2 (Januar 2003): 15–24. http://dx.doi.org/10.1080/14399776.2003.10781162.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

22

Jaliel, Ahmed Kadhiam, und Munaf F. Badr. „Application of Directional Control Solenoid Valves in Pneumatic Position System“. IOP Conference Series: Materials Science and Engineering 870 (18.07.2020): 012044. http://dx.doi.org/10.1088/1757-899x/870/1/012044.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

23

Lisowski, E., W. Czyżycki und J. Rajda. „Multifunctional four-port directional control valve constructed from logic valves“. Energy Conversion and Management 87 (November 2014): 905–13. http://dx.doi.org/10.1016/j.enconman.2014.07.008.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

24

Tripathi, Jay Prakash, und Sanjoy Ghoshal. „Combining inertia and constriction technique in the PSO applied to fault identification in a hydraulic system“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, Nr. 14 (22.03.2016): 2730–40. http://dx.doi.org/10.1177/0954406216640302.

Der volle Inhalt der Quelle

Annotation:

A novel methodology for simultaneous parametric fault isolation and mode switching identification in the spool motion of a Directional Control Valve (DCV), under multi fault assumption, has been reported in this paper. The shape of the profile traversed by the DCV spool was assumed to be trapezoidal in both healthy and faulty condition, but the slope of trapezoidal may change due to fault. Under this assumption, the real valued fault parameter and binary mode switching were identified by real valued Particle Swarm Optimization (PSO) alone instead of a combined real and binary valued PSO (Hybrid PSO). A novel PSO algorithm by combining the concepts of varying inertia weight (both increasing and decreasing trend) and constriction factor has been proposed in the article to achieve more accurate identification. Its validity was examined using an existing heuristic formula and by conducting several tests on a benchmark function used for fault identification. Superior improvement was observed in the identification with increasing inertia weight than that of widely used decreasing inertia weight, when combined with the constriction coefficient. A high pressure hydraulic circuit used in dumper and several other lifting machines was used as a simulation example.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

25

Takosoglu, Jakub. „Analysis of the possibility of using high-speed pneumatic directional valves to regulate the flow of compressed air“. EPJ Web of Conferences 213 (2019): 02084. http://dx.doi.org/10.1051/epjconf/201921302084.

Der volle Inhalt der Quelle

Annotation:

Most often, proportional flow valves or flow servovalves are used for position control of pneumatic drives. In case of this type of valves, flow characteristic of the valve represents a dependence of flow rate upon analogue control signal (voltage or current). The paper presents experimental studies of two high-speed pneumatic 3/2 directional valves (3-way 2-position) in order to determine the flow characteristics and flow parameters. One has analysed the option to use the directional valves to control the flow rate of compressed air using frequency-based signals.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

26

Salloom, Maher Yahya, und Z. Samad. „Experimental Test of Magneto-Rheological Directional Control Valve“. Advanced Materials Research 383-390 (November 2011): 5409–13. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5409.

Der volle Inhalt der Quelle

Annotation:

Directional control valve is the main part in hydraulic system which has complex construction, such as moving spool to control the direction of actuator for required speed. Utilizing MR fluid properties, direct interface can be realized between magnetic field and fluid power without the need for moving parts like spool in directional control valves. This paper dedicates the experimental test of four ways, three position MR directional control valve. The experimental methods were done by connecting the MR directional control valve with hydraulic actuators. The experiment was conducted to show the principle work of the valve functionally and performance test for valve was done. The valve works proportionally to control the direction and speed of hydraulic actuators. As a result, the experimental result demonstrates the operation of MR directional control valve using two configurations. The experimental about ON-OFF and proportional operations is discussed. The MR directional control valve can replace many types of the spool directional control valve for controlling hydraulic actuator.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

27

Aleksandrov, Yevgen, Tetyana Aleksandrova, Alexander Grigoriev und Yaroslav Morhun. „ABOUT THE INFLUENCE OF VIBRATIONS OF THE CONVEYED LIQUID ON THE AREA OF STABILITY OF A CLOSED SYSTEM AUTOMATIC VEHICLE COURSE CONTROL“. Bulletin of National Technical University "KhPI". Series: System Analysis, Control and Information Technologies, Nr. 1 (5) (12.07.2021): 29–41. http://dx.doi.org/10.20998/2079-0023.2021.01.05.

Der volle Inhalt der Quelle

Annotation:

The existing publications that investigate vehicle course stability optimization were analyzed. A mathematical model, which describes the disturbed movement of a car with a tank, was compiled. This model allows to consider the liquid free surface oscillations and determine their effect on the car course stability during constant motion or emergency braking. There was described the main information regarding the car that was used to perform mathematical calculations. An algorithm was developed for deriving the characteristic equation for a complex system of differential equations describing dynamic changes in the movement parameters of a car, oscillations of partial layers of liquid in a tank and the operation of an electromagnetic drive of the control valve and an electronic PID controller for a two-circuit system for ensuring course stability. Based on the developed mathematical model, the influence of forced oscillations of the fluid on the stability area of the system built in the plane of variable parameters of the controller is investigated. It is shown that low-frequency oscillations of the free surface of a liquid lead to a significant reduction in the stability area, which indicates the need to consider such oscillations when solving problems of analysis and synthesis of this system. It was found that for a car with a tank, where low-frequency transverse oscillations of the liquid occur, which are accompanied by a redistribution of mass and disturb the movement, an increase of the speed unambiguously leads to a deterioration in directional stability. That enables exclusion of speed from the number of variable parameters and significantly simplify the problem being solved. The calculations for cases with different loading levels were performed. It was found out that the level of liquid in the tank, considering its relationship with the speed, has an ambiguous effect on the car course stability, and it is unacceptable to limit the research calculations to the case with 50 % load. Instead of this, it is necessary to find a line that bends from above the stability boundaries that correspond to many liquid levels. Keywords: fluid vibrations; exchange rate stability system; area of stability; tank; PID-controller; parameters.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

28

Qi, Haitao, Gary M. Bone und Yile Zhang. „Position Control of Pneumatic Actuators Using Three-Mode Discrete-Valued Model Predictive Control“. Actuators 8, Nr. 3 (19.07.2019): 56. http://dx.doi.org/10.3390/act8030056.

Der volle Inhalt der Quelle

Annotation:

A novel discrete-valued model-predictive control (DVMPC) algorithm termed DVMPC2 for the position control of pneumatic actuators using inexpensive on/off valves is presented. DVMPC2 includes a more flexible cost function, an improved prediction strategy, and other improvements. The actuator is a double-acting cylinder with two on/off solenoid poppet valves connected to each chamber. To reduce the switching frequency and prolong the valve life, DVMPC2 directly switches the valves when necessary, instead of using relatively high-frequency pulse-width modulation. Experimental comparisons are made with the state-of-the-art sliding-mode control (SMC) algorithm and the previous DVMPC algorithm. The comparisons are based on the five performance metrics: integral of time-weighted absolute error (ITAE), root mean square error (RMSE), overshoot (OS), steady-state error (SSE), and valve switches per second (SPS). The robustness is evaluated by increasing and decreasing the total mass of the moving components while keeping the controller parameters constant. The experimental results show that the proposed algorithm is superior to the previous DVMPC and outperformed SMC by a wide margin. Specifically, DVMPC2 reduced ITAE by 80%, RMSE by 52%, OS by 43%, and SPS by 20% relative to SMC. There was no clear winner in terms of SSE.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

29

Zabiri, H., und M. Gaberalla M. K. Elarafi. „Analysis of Control Valves Stiction Quantification Tool“. ASEAN Journal of Chemical Engineering 16, Nr. 2 (07.07.2017): 70. http://dx.doi.org/10.22146/ajche.49895.

Der volle Inhalt der Quelle

Annotation:

Control valve stiction is considered as one of the main sources of control loops nonlinearities which impacts plants profitability. In turn, this phenomenon hinders the plant from being operated at optimal conditions. Therefore, an efficient and accurate stiction quantification algorithm is required for accurate stiction compensation and timely scheduling of control valve maintenance. This research investigates the robustness and recommends improvements to the previously developed stiction quantification approach by Zabiri et al. The approach was tested under several operating conditions which were simulated in five case studies by using MATLAB software. The case studies investigated the impact of a wide range of stiction values, controller tuning, disturbance, time delay and noise on the quantification approach. The algorithm was found to be robust since it quantified the correct values of stiction regardless of the operating conditions. It was found that the accuracy of the quantification results depends on the process model accuracy, number of data samples and the search resolution. A number of improvements were recommended and validated by simulation in order to further enhance the current quantification approach. As conclusion, the algorithm can be applied on any type of process due to its robustness.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

30

Yang, Huayong. „PROGRESS IN THE EVOLUTION OF DIRECTIONAL CONTROL VALVES AND FUTURE TRENDS“. Chinese Journal of Mechanical Engineering 41, Nr. 10 (2005): 1. http://dx.doi.org/10.3901/jme.2005.10.001.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

31

Filo, Grzegorz, Edward Lisowski und Janusz Rajda. „Pressure Loss Reduction in an Innovative Directional Poppet Control Valve“. Energies 13, Nr. 12 (17.06.2020): 3149. http://dx.doi.org/10.3390/en13123149.

Der volle Inhalt der Quelle

Annotation:

This article presents the results of computational fluid dynamics (CFD) analysis of an innovative directional control valve consisting of four poppet seat valves and two electromagnets enclosed inside a single body. The valve has a unique design, allowing the use of any poppet valve configuration. Both normally opened (NO) and normally closed (NC) seat valves can be applied. The combination of four universal valve seats and two electromagnets gives a wide range of flow path configurations. This significantly increases the possibility of practical applications. However, due to the significant miniaturization of the valve body and the requirement to obtain necessary connections between flow paths, multiple geometrically complex channels had to be made inside the body. Hence, the main purpose of work was to shape the geometry of the flow channels in such a way as to minimize pressure losses. During the CFD analyses velocity distribution in flow channels and pressure distribution on the walls were determined. The results were used to obtain pressure loss as a function of flow rate, which was then verified by means of laboratory experiments conducted on a test bench.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

32

Fu, Zhengqing, Guolin Liu, Lanlan Guo, Weike Liu und Hua Guo. „Nonlinear Least Square Based on Control Direction by Dual Method and Its Application“. Mathematical Problems in Engineering 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/7094157.

Der volle Inhalt der Quelle

Annotation:

A direction controlled nonlinear least square (NLS) estimation algorithm using the primal-dual method is proposed. The least square model is transformed into the primal-dual model; then direction of iteration can be controlled by duality. The iterative algorithm is designed. The Hilbert morbid matrix is processed by the new model and the least square estimate and ridge estimate. The main research method is to combine qualitative analysis and quantitative analysis. The deviation between estimated values and the true value and the estimated residuals fluctuation of different methods are used for qualitative analysis. The root mean square error (RMSE) is used for quantitative analysis. The results of experiment show that the model has the smallest residual error and the minimum root mean square error. The new estimate model has effectiveness and high precision. The genuine data of Jining area in unwrapping experiments are used and the comparison with other classical unwrapping algorithms is made, so better results in precision aspects can be achieved through the proposed algorithm.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

33

Wei, Yan Hong, Chang Xu, Gui Rong Wang und Yun Tang Li. „The Design of Control System for Motion Platform Based PLC“. Applied Mechanics and Materials 464 (November 2013): 222–28. http://dx.doi.org/10.4028/www.scientific.net/amm.464.222.

Der volle Inhalt der Quelle

Annotation:

In this paper, a new-style platform control system with three degree of freedoms: up-down motion, left-right rolling and front-rear pitching is designed ,and also its composition, operating principle and soft design method are introduced. The system is driven by air cylinder and consists of FX series PLC, AD module, DA module, proportional valves , sliding rheostats and so on. Among these modules, sliding rheostats works as a feedback component to comprise a closed loop. Furthermore, to ensure the high positioning precision, thePIDalgorithm is applied. In addition, to control the motion flow reliably, the ladder logic diagram of the turn-off prior to turn-on is used to replace Sequential Function Chart. Experiments show that the motion platform is steady and safety when the proportional valves and directional valves are controlled by PLC.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

34

Tautenhahn, Ralf, und Jürgen Weber. „Cross-Domain Tolerance Analysis for Directional Control Valves Based on Imperfect Information“. Applied Mechanics and Materials 885 (November 2018): 276–89. http://dx.doi.org/10.4028/www.scientific.net/amm.885.276.

Der volle Inhalt der Quelle

Annotation:

The task of tolerance analysis usually addresses the question of the mechanical mountability of an assembly. We extend this viewpoint when talking about directional control valves in a crossdomain tolerance analysis; an analysis whose task is to determine the possible variation in the key product characteristics induced by a specific tolerance concept. As the available information about the noise factors to be toleranced is almost always imperfect generalised methods for their representation and the propagation of their impact on the key product characteristics are required. In this study the capabilities and potentials of belief and plausibility measures as well as fuzzy random variables are compared to traditional worst-case and statistical tolerance analysis.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

35

NOURI, Bashir M. Y., und Ma’ali B. Y. SAUDI. „Experimental Modelling and Identification of Compressible Flow through Proportional Directional Control Valves“. Universal Journal of Control and Automation 2, Nr. 1 (Januar 2014): 4–13. http://dx.doi.org/10.13189/ujca.2014.020102.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

36

Vonderbank, Tobias, und Katharina Schmitz. „Conceptual Design of Electromechanical Actuation Systems for Large-Sized Directional Control Valves“. Actuators 10, Nr. 6 (16.06.2021): 133. http://dx.doi.org/10.3390/act10060133.

Der volle Inhalt der Quelle

Annotation:

Increasing performance in modern hydraulics is achieved by a close investigation of possible enhancements of its components. Prior research has pointed out that electromechanical actuators can form suitable alternatives to hydraulically piloted control systems. Since the requirements at these actuation systems depend on the operating conditions of the system, each actuator can be optimized to the respective hydraulic system. Considering that many different conceptual designs are suitable, the phase of conceptual design plays a decisive role during the design process. Therefore, this paper focuses on the process of developing new conceptual designs for electromechanical valve actuation systems using the method of function structures. Aiming to identify special design features, which need to be considered during the design process of electromechanical actuation systems, an exemplary actuator was designed based on the derived function structure. To highlight the potential of function structures for the development of new electromechanical valve actuation systems, two principal concepts, which allow the reduction of the necessary forces, have been developed by extending the function structure. These concepts have been experimentally investigated to identify their advantages and disadvantages.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

37

Foglianti, Gioia, Stefano Alvisi, Marco Franchini und Ezio Todini. „Extending the Global-Gradient Algorithm to Solve Pressure-Control Valves“. Journal of Water Resources Planning and Management 146, Nr. 8 (August 2020): 04020055. http://dx.doi.org/10.1061/(asce)wr.1943-5452.0001247.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

38

Zhang, Chang Jun, Jing Li, Hong Gang Jiang, Yun Chen und Yao Bao Yin. „Design and Analysis of a Two-Valve Control Hydraulic System for Controllable Pitch Propeller“. Advanced Materials Research 468-471 (Februar 2012): 122–26. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.122.

Der volle Inhalt der Quelle

Annotation:

This paper designs a two-valve control hydraulic system for controllable pitch propeller which consists of an electro-hydraulic directional control valve and a proportional directional control valve. The parallel control strategy is proposed and respective controllers are determined for the system. It yields out the relationship between the control parameters and valves characteristics by modeling and simulation analysis. Also the influence of the proportional valve flow rate on pitch control accuracy is discussed.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

39

Hong, Yeh-Sun, Dong-Hyun Ha und Myung-Ki Yeom. „Design of a two-dimensional proportional solenoid for miniature directional control pneumatic valves“. KSME International Journal 17, Nr. 7 (Juli 2003): 978–85. http://dx.doi.org/10.1007/bf02982982.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

40

Creaco, E., und M. Franchini. „A new algorithm for real-time pressure control in water distribution networks“. Water Supply 13, Nr. 4 (01.08.2013): 875–82. http://dx.doi.org/10.2166/ws.2013.074.

Der volle Inhalt der Quelle

Annotation:

This paper presents a new logic algorithm for real-time control of regulation valves in water distribution networks. This method entails identifying in real time the appropriate closure setting of regulation valves in order to reach and keep the desired piezometric height at the control node(s), by making use of measurements concerning both the piezometric height at the control node(s) and the water discharge in the pipes fitted with regulation valves. In the numerical application herein described this control algorithm is implemented within a hydraulic simulation model and is tested in the case study of a real distribution network, in which there is only one control valve, installed in the pipe linking the serving tank to the network. Results showed excellent performance in terms of pressure regulation (with very small deviations from the desired set-point value) and leakage reduction under various operation conditions.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

41

Arciuolo, Thomas F., und Miad Faezipour. „PID++: A Computationally Lightweight Humanoid Motion Control Algorithm“. Sensors 21, Nr. 2 (11.01.2021): 456. http://dx.doi.org/10.3390/s21020456.

Der volle Inhalt der Quelle

Annotation:

Currently robotic motion control algorithms are tedious at best to implement, are lacking in automatic situational adaptability, and tend to be static in nature. Humanoid (human-like) control is little more than a dream, for all, but the fastest computers. The main idea of the work presented in this paper is to define a radically new, simple, and computationally lightweight approach to humanoid motion control. A new Proportional-Integral-Derivative (PID) controller algorithm called PID++ is proposed in this work that uses minor adjustments with basic arithmetic, based on the real-time encoder position input, to achieve a stable, precise, controlled, dynamic, adaptive control system, for linear motion control, in any direction regardless of load. With no PID coefficients initially specified, the proposed PID++ algorithm dynamically adjusts and updates the PID coefficients Kp, Ki and Kd periodically. No database of values is required to be stored as only the current and previous values of the sensed position with an accurate time base are used in the computations and overwritten in each read interval, eliminating the need of deploying much memory for storing and using vectors or matrices. Complete in its implementation, and truly dynamic and adaptive by design, engineers will be able to use this algorithm in commercial, industrial, biomedical, and space applications alike. With characteristics that are unmistakably human, motion control can be feasibly implemented on even the smallest microcontrollers (MCU) using a single command and without the need of reprogramming or reconfiguration.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

42

Arciuolo, Thomas F., und Miad Faezipour. „PID++: A Computationally Lightweight Humanoid Motion Control Algorithm“. Sensors 21, Nr. 2 (11.01.2021): 456. http://dx.doi.org/10.3390/s21020456.

Der volle Inhalt der Quelle

Annotation:

Currently robotic motion control algorithms are tedious at best to implement, are lacking in automatic situational adaptability, and tend to be static in nature. Humanoid (human-like) control is little more than a dream, for all, but the fastest computers. The main idea of the work presented in this paper is to define a radically new, simple, and computationally lightweight approach to humanoid motion control. A new Proportional-Integral-Derivative (PID) controller algorithm called PID++ is proposed in this work that uses minor adjustments with basic arithmetic, based on the real-time encoder position input, to achieve a stable, precise, controlled, dynamic, adaptive control system, for linear motion control, in any direction regardless of load. With no PID coefficients initially specified, the proposed PID++ algorithm dynamically adjusts and updates the PID coefficients Kp, Ki and Kd periodically. No database of values is required to be stored as only the current and previous values of the sensed position with an accurate time base are used in the computations and overwritten in each read interval, eliminating the need of deploying much memory for storing and using vectors or matrices. Complete in its implementation, and truly dynamic and adaptive by design, engineers will be able to use this algorithm in commercial, industrial, biomedical, and space applications alike. With characteristics that are unmistakably human, motion control can be feasibly implemented on even the smallest microcontrollers (MCU) using a single command and without the need of reprogramming or reconfiguration.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

43

Reis, L. F. R., R. M. Porto und F. H. Chaudhry. „Optimal Location of Control Valves in Pipe Networks by Genetic Algorithm“. Journal of Water Resources Planning and Management 123, Nr. 6 (November 1997): 317–26. http://dx.doi.org/10.1061/(asce)0733-9496(1997)123:6(317).

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

44

Jiang, Yinlai, Shuoyu Wang, Kenji Ishida, Takeshi Ando und Masakatsu G. Fujie. „Directional Intention Identification for Running Control of an Omnidirectional Walker“. Journal of Advanced Computational Intelligence and Intelligent Informatics 14, Nr. 7 (20.11.2010): 784–92. http://dx.doi.org/10.20965/jaciii.2010.p0784.

Der volle Inhalt der Quelle

Annotation:

Walking is a vital exercise for health promotion and a fundamental ability necessary for everyday life. In previous work, we developed an OmniDirectional Walker (ODW) for walking rehabilitation and walking support. In walking support, it is necessary for the ODW to know the direction the user intends to go based on user manipulation. Actual directional intent must, however, be identified from physical manipulation because a user’s directional intent and physical manipulation are not always mutually consistent. In this paper, a novel interface is proposed to recognize a user’s directional intention according to the forearm pressures exerted to the ODW by the user with wrists and elbows. The forearm pressures are measured by 4 sensors embedded in the ODW’s armrest. The relationship between forearm pressure and directional intention was extracted as fuzzy rules and an algorithm was proposed for directional intention identification based on distance-type fuzzy reasoning method. The effectiveness of the algorithm was verified by experimental reasoning results demonstrated to be consistent with intended directions.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

45

Kropiwnicki, Jacek, Mariusz Furmanek und Andrzej Rogala. „Modular Approach for Modelling Warming up Process in Water Installations with Flow-Regulating Elements“. Energies 14, Nr. 15 (29.07.2021): 4599. http://dx.doi.org/10.3390/en14154599.

Der volle Inhalt der Quelle

Annotation:

The paper presents a new method for modelling the warming up process of a water system with elements regulating the flow in a stochastic manner. The paper presents the basic equations describing the work of typical elements which the water installation is composed of. In the proposed method, a new computational algorithm was used in the form of an iterative procedure enabling the use of boundary conditions that can be stochastically modified during the warming-up process. A typical situation, when such a modification is processed, is the regulation of the medium flow through two-way or three-way valves or applying additional heat source. Moreover, the presented method does not require the transformation of the differential equations, describing the operation of individual elements, into a linear form, which significantly facilitates analytical work and makes it more flexible. The example of analysis of the operation of water installation used for controlling temperature of the process gases in a chemical installation shows the functionality and flexibility of the method. The adopted calculation schematics enable changing the direction of the heat flow while the heat exchanger is in operation. Additionally, the sequence of calculation processed in modules describing operation of installation elements is elective (there is no situation that output parameters from one element are used as input parameters for other element in the same calculation step).

APA, Harvard, Vancouver, ISO und andere Zitierweisen

46

Xie, Hai Bo, Jian Chen, Hua Yong Yang, Zhi Bin Liu, Yu Zhen, Jin Zhang und Jia Qian Wang. „Optimization on Control Time Sequence of Double-Pump Hydraulic System of Concrete Pump“. Applied Mechanics and Materials 437 (Oktober 2013): 728–33. http://dx.doi.org/10.4028/www.scientific.net/amm.437.728.

Der volle Inhalt der Quelle

Annotation:

This research mainly investigates the control time sequence in the open circuit double-pump hydraulic system of the concrete pump. The control time sequence is the electrical signals given to the two pumps and the pilot valves of the two main valves. Under the signals’ control, the valves are switched and the flowrate of the two pumps becomes low during the valve switch in order to save energy and reduce the impact pressure. According to the actual hydraulic components, the simulation models about two main hydraulic circuits which are pumping circuit and distributing circuit including directional valves, the pump with the function of constant power control with pressure cut-off and electrical stroke limiter, the two pumping cylinders with cushion structure and distributing structure are developed with software AMESim. On the basis of the two circuits model, an integrated simulation model is developed. Having been validated by the pumping water experiment, the simulation model is used to simulate different control time sequence. Based on the analysis of these simulation results, a proper control time sequence which ensures the pumping system has higher pumping efficiency and longer cylinder stroke is achieved.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

47

HONG, Yeh-Sun, Dong-Hyun HA, Myung-Ki Yeom und Byung-Kyu Kim. „Design of a new two-dimensional proportional solenoid for miniaturized directional control pneumatic valves“. Proceedings of the JFPS International Symposium on Fluid Power 2002, Nr. 5-3 (2002): 709–14. http://dx.doi.org/10.5739/isfp.2002.709.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

48

Pongchairerks, Pisut. „An Enhanced Two-Level Metaheuristic Algorithm with Adaptive Hybrid Neighborhood Structures for the Job-Shop Scheduling Problem“. Complexity 2020 (28.06.2020): 1–15. http://dx.doi.org/10.1155/2020/3489209.

Der volle Inhalt der Quelle

Annotation:

For solving the job-shop scheduling problem (JSP), this paper proposes a novel two-level metaheuristic algorithm, where its upper-level algorithm controls the input parameters of its lower-level algorithm. The lower-level algorithm is a local search algorithm searching for an optimal JSP solution within a hybrid neighborhood structure. To generate each neighbor solution, the lower-level algorithm randomly uses one of two neighbor operators by a given probability. The upper-level algorithm is a population-based search algorithm developed for controlling the five input parameters of the lower-level algorithm, i.e., a perturbation operator, a scheduling direction, an ordered pair of two neighbor operators, a probability of selecting a neighbor operator, and a start solution-representing permutation. Many operators are proposed in this paper as options for the perturbation and neighbor operators. Under the control of the upper-level algorithm, the lower-level algorithm can be evolved in its input-parameter values and neighborhood structure. Moreover, with the perturbation operator and the start solution-representing permutation controlled, the two-level metaheuristic algorithm performs like a multistart iterated local search algorithm. The experiment’s results indicated that the two-level metaheuristic algorithm outperformed its previous variant and the two other high-performing algorithms in terms of solution quality.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

49

HE, Peng. „Distributed Topology Control Algorithm for Ad Hoc Networks Using Directional Antennas“. Journal of Software 18, Nr. 4 (2007): 1308. http://dx.doi.org/10.1360/jos181308.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

50

Wang, Jian Bin, Yi Min Yang und Jing Li. „A Minimum-Energy Consumption Control Algorithm for Omni-Directional Mobile Robots“. Applied Mechanics and Materials 291-294 (Februar 2013): 2408–11. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2408.

Der volle Inhalt der Quelle

Annotation:

A minimum-energy consumption control algorithm is applied to motion control of a four-wheel drive omni-directional mobile robot (FDOMR) in actual application environment. After establishing the robot’s dynamic equations with motor model, we have chosen a practical cost function as the total energy drawn from the batteries. Considering the translation and rotation, we have found out the velocity curve by optimal control theory. Various simulations are performed and the consumed energy is compared to the normal control method that without minimum energy consumption control. Simulation results reveal that the energy saving is much more compared to the traditional control, the operational time of the FDOMR with given batteries is lengthened and the efficiency of battery is improved.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Zeitschriftenartikel zum Thema „Control algorithm for directional control valves“

Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an