The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform
Zhang Gui-ron - One of the best experts on this subject based on the ideXlab platform.
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Design and realization of an Automatic Actuator testing system
Sensor World, 2014Co-Authors: Zhang Gui-ronAbstract:In order to test the steering gear performance and working life more flexibly and accurately, an Automatic servo performance test system is developed based on IPC, torque loader, torque sensor and angle sensor. The test system adopts portable integrated PXI chassis and high precision multifunctional data acquisition card produced by NI company to monitor the voltage and current signals of steering controller and Actuator position signals in real time. Based on the Lab VIEW programmable platform, corresponding measurement software is developed,and the friendly manmachine interactive interface is designed. So the parameter measurement and qualified judgment of the steering gear products are realized. By compared the test data with those from the old test system for the same Actuator product, the new test system is proved to have higher test accuracy and test efficiency.
Nobuyuki Yoshizawa - One of the best experts on this subject based on the ideXlab platform.
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Automatic Actuator control by leg load signal of active AFO for achilles tendon ruptures
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Inte, 2009Co-Authors: Nobuyuki YoshizawaAbstract:This paper describes Automatic Actuator control hardware for an active ankle foot orthosis (AAFO) for a ruptured Achilles tendon. The sole of the AAFO is equipped with a servomotor. The Actuator can switch the upright and the forward stepping posture of the patient. To control the Actuator Automatically during a gate cycle, 1: joint kinematics were analyzed that consisted of both stick pictures and EMG signals from the affected limb when the patient was walking on a treadmill. The cross-correlation coefficient between the ankle angle and the EMG signal of the lower limb (tibialis anterior) was small when the patient was wearing the AAFO. 2: An air pressure sensor and a film sensor were compared experimentally to measure the leg load. A prototype AAFO with Automatic control was realized by using the leg load signal provided by an air pressure sensor to realize Actuator control.
Lawal, Sulaiman Ayobami - One of the best experts on this subject based on the ideXlab platform.
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Fault tolerant control system design for distillation processes
Newcastle University, 2018Co-Authors: Lawal, Sulaiman AyobamiAbstract:PhD ThesisThe complexity and sophistication of modern control systems deployed in the re nery operation, particularly the crude distillation unit as a result of increasing demand for higher performance and improved safety, are on the increase. This growing complexity comes with some level of vulnerabilities, part of which is the potential failure in some of the components that make up the control system, such as Actuators and sensors. The interplay between these components and the control system needs to have some built-in robustness in the face of Actuator and sensor faults, to guarantee higher reliability and improved safety of the control system and the plant respectively, which is fundamental to the economy and operation of the system. This thesis focuses on the application of frugally designed fault tolerant control systems (FTCS) with Automatic Actuator and sensor faults containment capabilities on distillation processes, particularly atmospheric crude distillation unit. A simple active Actuator FTCS that used backup feedback signal, switchable references and restructurable PID controllers was designed and implemented on three distillation processes with varying complexities { methanol-water separation column, the benchmark Shell heavy oil fractionator, and an interactive dynamic crude distillation unit (CDU) to accommodate Actuator faults. The fault detection and diagnosis (FDD) component of the Actuator FTCS used dynamic principal component analysis (DPCA), a data-based fault diagnostic technique, because of its simplicity and ability to handle large amount of correlated process measurements. The recon gurable structure of the PID controllers was achieved using relative gain array (RGA) and dynamic RGA system interaction analysis tools for possible inputs { outputs pairing with and without the occurrence of Actuator faults. The interactive dynamic simulation of CDU was developed in HYSYS and integrated with MATLAB application through which the FDD and the Actuator FTCS were implemented. The proposed Actuator FTCS is proved being very e ective in accommodating Actuator faults in cases where there are suitable inputs { outputs pairing after occurrence of an Actuator fault. Fault tolerant inferential controller (FTIC) was also designed and implemented on a binary distillation column and an interactive atmospheric CDU to accommodate sensor faults related to the controlled variables. The FTIC used dynamic partial least squared (DPLS) and dynamic principal component regression (DPCR) based soft sensor techniques to provide redundant controlled variable estimates, which are then used in place of faulty sensor outputs in the feedback loops to accommodate sensor faults and maintain the integrity of the entire control system. Implementation issues arising from the e ects of a sensor fault on the secondary variables used for soft sensor estimation were addressed and the approach was shown to be very e ective in accommodating all the sensor faults investigated in the distillation units. The Actuator FTCS and the FTIC were then integrated with the DPCA FDD scheme to form a complete FTCS capable of accommodating successive Actuator and sensor faults in the distillation processes investigated. The simulation results demonstrated the e ectiveness of the proposed approach. Lastly, fault tolerant model predictive control (FTMPC) with restructurable inputs { outputs pairing in the presence of Actuator faults based on preassessed recon gurable control structures was proposed, and implemented on an interactive dynamic CDU. The FTMPC system used a rst order plus dead time (FOPDT) model of the plant for output prediction and RGA and DRGA tools to analyse possible control structure recon guration. The strategy helped improve the availability and performance of control systems in the presence of Actuator faults, and can ultimately help prevent avoidable potential disasters in the re nery operation with improved bottom line { Pro t. Overall, the proposed approaches are shown to be e ective in handling Actuator and sensor faults, when there are suitable manipulated variables and redundant analytical signals that could be used to contain the e ects of the faults on the system.University of Lagos, Nigeria & Petroleum Technology Development Fund (PTDF) for the Scholarship award at the later stage of my research programme
Suresh Nair - One of the best experts on this subject based on the ideXlab platform.
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Optimization of Shutdown Valve Weight and Size
Day 4 Fri March 25 2016, 2016Co-Authors: Suresh NairAbstract:Abstract Automatic Shutdown Valve also referred to as, Actuated Shutdown Valve is designed for automated protection to safeguard personnel, environment and to control hazardous or abnormal operations. Ball valves are widely used for Shutdown service, fitted with quarter turn Actuator. Pneumatic Scotch-Yoke type is the preferred Actuator design with single acting and spring return type configurations to meet fail-safe conditions and safety critical functions. The article stated hereby as Shutdown Valve is a general term used for the complete assembly inclusive of Valve coupled with Actuator for shutdown service. Optimization of the assembly is examined in this article through significiant emphasis on the coupled Automatic Actuator. Through marginal changes in the pneumatic system design and usage of appropriate variable factors in Actuator torque profile, aims to evaluate optimization techniques for shutdown valve Actuator weight and size / dimensions. An analysis on Actuator weight and size affected through Actuator design factor is carried out in this article. The details are extended to Actuator sizing data, illustrations and comparisons, to outline the approaches currently followed and the possible area of improvement in the pneumatic design and Actuator selection. The paper assesses the advantages on Actuators types and the variance between design methods. In addition, the article analyses the air supply to Actuator and feasibility for the improvement in design.
Min Zhang - One of the best experts on this subject based on the ideXlab platform.
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An Automatic liquid-filled colour-changing glasses based on thermo-pneumatic technology
2015 International Conference on Fluid Power and Mechatronics (FPM), 2015Co-Authors: Min ZhangAbstract:In this paper, an Automatic liquid-filled colour-changing glasses with microfluidic channels is presented to protect human eyes from strong lights. A simple serpentine channel on the colour-changing lens is designed and fabricated with transparent PDMS based on soft lithography technology, and the detailed fabrication process is given in this research. An Automatic Actuator based on thermo-pneumatic technology is designed and micromachined to drive the colour liquid to circulate in the microfluidic channels. The response characteristics of the colour-changing glasses under different experimental conditions are calculated theoretically and tested by experiments. The Automatic liquid colour-changing glasses show faster response characteristics compared to traditional solid colour-changing pattern.
