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Journal articles on the topic 'Servo amplifier'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Lu, Yun Dan, Liang Cai Zeng, Fei Long Zheng, Gang Sheng Kai, and Qiang Hua Xi. "Design and Characteristic Analysis on Servo Amplifier." Advanced Materials Research 926-930 (May 2014): 1235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1235.

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With the rapid development of the electro-hydraulic servo control technology, the application of electro-hydraulic servo valve has become more and more widely. Servo amplifier is an important part of the electro-hydraulic servo control system to drive and control servo valve. This essay introduces the principle and the function of servo-amplifier, and designs a servo amplifier with the functions of proportional amplifier, zero adjustment, feedback and current limitation. The performance analysis and validation for the servo amplifier are carried out by using simulation software EDA .On the bas

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2

Guo, Yong Feng, Song Luo, Ze Bin Ling, and Xiao You Zhang. "Research of Drives of Power Amplifiers of Magnetic Levitation Servo Spindle Applied to Micro EDM Based on FPGA." Key Engineering Materials 621 (August 2014): 564–69. http://dx.doi.org/10.4028/www.scientific.net/kem.621.564.

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The drives of power amplifiers of magnetic levitation servo spindle applied to micro EDM (Electron discharge machining) based on FPGA (Field programmable gate array) are developed. The drive module that produces the PWM (Pulse width modulation) waves that conform to the requirements of spindle power amplifiers involving three-level half bridge switch power amplifier, three-level full bridge switch power amplifier and motor power amplifier, according to input of action values from magnetic levitation servo spindle controller DSP (Digital signal processor) is designed. Multi-PWM producing algori

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3

Shindo, Yuji, and Takao Wada. "Development of a Digitally-Controlled Servo Amplifier for Robots." Journal of Robotics and Mechatronics 6, no. 2 (1994): 155–61. http://dx.doi.org/10.20965/jrm.1994.p0155.

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Kawasaki Heavy Industries, Ltd. has developed a digitally-controlled servo amplifier for robot servo motors. The motor's armature current, position and velocity are controlled by the software in a digital signal processor. The servo is designed for high reliability, performance, flexibility and compactness. To achieve these objectives, we developed an ASIC which controls PWM signals for power transistors and encoder signals. The servo amplifier is currently used in the new Kawasaki AD series of robot controllers.

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Huo, Li Gang, Yun Fei Zhou, and Guang Dou Liu. "A High-Performance Digital Servo Driver for Magnetic Levitation Planar Motor." Advanced Materials Research 712-715 (June 2013): 2113–18. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.2113.

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A new digital DC servo driver based on DSP and FPGA for planar motor was designed in this paper. Current feedback and digital self-tuning PID algorithm control strategy are applied. Switching power amplifier or class D amplifier is the choice of power amplifier. The most prominent characteristic of the servo driver used in planar motor is high efficiency, low temperature drift, small size, fast response, and high-bandwidth. Finally, the performance parameters and power loss parameters of the servo driver are given.

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5

Lu, Hong, S. C. Choi, S. M. Lee, C. H. Park, and D. W. Lee. "Development of a Magnified Mechanism for Fast Tool Servo System." Key Engineering Materials 516 (June 2012): 317–20. http://dx.doi.org/10.4028/www.scientific.net/kem.516.317.

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Flexure-hinge mechanisms are commonly used in the design of translational micro/nanopositioning stages. They can offer a drive system with negligible friction and no need for lubrication. Usually, a large motion range requires the use of a very long actuator which could interfere with a tight workplace. A lever which amplifies the input motion of a short actuator is an effective technique to solve the problem. This paper presents the methodology for the design of a lever-type magnified flexure mechanism used for the ultra precision fast tool servo (FTS) system. A lever type hinge mechanism is

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6

Jea-Sen Lin and Chern-Lin Chen. "Buck/boost servo amplifier for direct-drive-valve actuation." IEEE Transactions on Aerospace and Electronic Systems 31, no. 3 (1995): 960–67. http://dx.doi.org/10.1109/7.395244.

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7

Schrader, Daniel J. "Servo-controlled amplifier and method for compensating for transducer nonlinearities." Journal of the Acoustical Society of America 89, no. 3 (1991): 1489–90. http://dx.doi.org/10.1121/1.400622.

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8

Han, Ying, Xu Zhang, Weifeng Quan, and Nan Li. "Design of PWM Amplifier Drive Module in Radar Servo System." Science Discovery 7, no. 5 (2019): 341. http://dx.doi.org/10.11648/j.sd.20190705.24.

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9

Liu, Chen, Sheng-Dun Zhao, and Jing-Xiang Li. "Design and analysis of a novel seven-bar mechanical servo press with dual motors inputs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 20 (2016): 3855–65. http://dx.doi.org/10.1177/0954406216653777.

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This paper proposes a novel high capacity servo press system with two servo motor inputs and high ratio force amplifier mechanism for metal forming. First, the press structure was expressed. The force amplifier was made of seven-bar mechanism which possesses quick-return character and high ratio force amplifier. The symmetric structure balanced the force in horizontal direction, and dispersed the forces on two transmission routes. In theoretical study of the new structure, kinematic and dynamic analyses were obtained by examining the geometry of the structure. The performance of press was disc

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10

Xiaocheng, Ma, Zhang Haotian, Cheng Yiqing, Zhu Lina, and Wu Dan. "Pulse-Width Modulated Amplifier for DC Servo System and Its Matlab Simulation." Open Electrical & Electronic Engineering Journal 9, no. 1 (2015): 625–31. http://dx.doi.org/10.2174/1874129001509010625.

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This paper introduces a mathematical model for Pulse-Width Modulated Amplifier for DC Servo Motor. The relationship between pulse-width modulated (PWM) signal and reference rotation speed is specified, and a general model of motor represented by transfer function is also put forward. When the input signal changes, the rotation speed of the servo motor will change accordingly. By changing zeros and poles, transient performance of this system is discussed in detail, and optimal ranges of the parameters is recommended at the end of discussion.

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11

ENDO, Katsuhisa, Yoshihisa ISHIDA, Takashi HONDA, and Yasuo OGAWA. "Improvement of Characteristics of Pneumatic Servo System by Increasing Amplifier Gain." Transactions of the Society of Instrument and Control Engineers 28, no. 6 (1992): 697–706. http://dx.doi.org/10.9746/sicetr1965.28.697.

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12

Yang, G., J. F. Barry, E. S. Shuman, M. H. Steinecker, and D. DeMille. "A low-cost, FPGA-based servo controller with lock-in amplifier." Journal of Instrumentation 7, no. 10 (2012): P10026. http://dx.doi.org/10.1088/1748-0221/7/10/p10026.

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13

Huang, Da Zhi, Qing Gui Zhou, Yuan Liang Zhang, and Jin Song Chen. "Electro-Hydraulic Servo Road Simulation System Based on Fuzzy Control." Advanced Materials Research 681 (April 2013): 214–18. http://dx.doi.org/10.4028/www.scientific.net/amr.681.214.

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The indoor road simulation test system test cycle is short, good reproducibility of the test results, confidentiality, etc., more and more attention in the vehicle industry. Analyzed by electro-hydraulic servo system of road simulation servo amplifier, electro-hydraulic servo valve, hydraulic cylinder and countertops and displacement transducer, The mathematical model of the system is established. The fuzzy model that comply with control law is designed. By unit step response simulation experiments, it is to be verified that the fuzzy control electro-hydraulic servo road simulation system is a

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14

Jia, Qing Mei, Jun Jun Tai, and Bin Xu. "Application of Full-Digital Servo Valve in Auto-Discharge Control System for the Jig." Advanced Materials Research 542-543 (June 2012): 555–58. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.555.

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In this paper, a full-digital Servo valve is built base on actual requirement of auto-discharge control system for the jig. Then the structure of full-digital Servo valve was introduced. Hydraulic cylinder was driven by the digital servo amplifier, to control the opening gate in auto-discharge control system for the jig. This jig can be maintained the stability of the bed chamber, to ensure product quality.

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15

Watanahe, Shuji, Hiroshi Takano, and Mutsuo Nakaoka. "Current Tracking Control System using Digital Type 1 Servo PWM Power Amplifier." IEEJ Transactions on Industry Applications 118, no. 11 (1998): 1328–29. http://dx.doi.org/10.1541/ieejias.118.1328.

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16

SAKAI, Fumitoshi, Yoshitsugu KAMIYA, Hiroaki SEKI, and Masatoshi HIKIZU. "Analysis of Non-Linear Dynamic Characteristics of Motor Driven by Conventional Servo Amplifier." Transactions of the Japan Society of Mechanical Engineers Series C 66, no. 647 (2000): 2303–9. http://dx.doi.org/10.1299/kikaic.66.2303.

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17

Liu, Yuekai, Zhijun Zhou, Yixin Zhou, Wenyuan Li, and Zhigong Wang. "A Low-Noise Chopper Amplifier with Offset and Low-Frequency Noise Compensation DC Servo Loop." Electronics 9, no. 11 (2020): 1797. http://dx.doi.org/10.3390/electronics9111797.

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The low-frequency and low-amplitude characteristics of neural signals poses challenges to neural signals recording. A low noise amplifier (LNA) plays an important role in the recording front-end. A chopper-stabilized analog front-end amplifier (FEA) for neural signal acquisition is presented in this paper. It solves the noise and offset interference caused by the servo loop in the chopper amplifier structure. The proposed FEA employs a switched-capacitor (SC) integrator with offset and low-frequency noise compensation. Moreover, a dc-blocking impedance is placed for ripple-rejection (RR), and

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18

Wang, Xin Hua, Zhi Jie Li, Shu Wen Sun, and Gang Zheng. "Investigation on the Prestage of a Water Hydraulic Jet Pipe Servo Valve Based on CFD." Applied Mechanics and Materials 197 (September 2012): 144–48. http://dx.doi.org/10.4028/www.scientific.net/amm.197.144.

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In a water hydraulic jet pipe servo valve, the overall performance of the valve is directly influenced by the structure dimension of the receiver and the prestage— jet pipe amplifier. This paper deals with the influence rules of the structure dimension parameters and performance parameters on the buildup pressure in the two receiving holes, including the vertical clearance between the nozzle and the receiver, the diameter of the nozzle hole, the diameter of the receiving orifice, and the nozzle offset distance. The best combination of structure size is finally obtained by using numerical simul

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19

Yan, Hao, Jing Li, Cunkun Cai, and Yukai Ren. "Numerical Investigation of Erosion Wear in the Hydraulic Amplifier of the Deflector Jet Servo Valve." Applied Sciences 10, no. 4 (2020): 1299. http://dx.doi.org/10.3390/app10041299.

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Although possessing a remarkable anti-contamination capacity, the deflector jet valve is still confronted with erosion wear brought by solid particles in hydraulic oil. To describe the erosion wear mechanism in the hydraulic amplifier of servo valves, a RANS-based CFD simulation is conducted to obtain its internal wear distribution following the Oka erosion model, which shows the erosion wear in servo valves can be divided into four levels and the major wear happens on the shunt wedge, characterized by a regular and fluctuant distribution. Further, there exist multiple relative maximums of ero

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20

Hikizu, Masatoshi, Hiroaki Seki, and Yoshitsugu Kamiya. "Effects and Application of Current Feedback in Servo System with Current Limiter." International Journal of Automation Technology 11, no. 1 (2017): 104–11. http://dx.doi.org/10.20965/ijat.2017.p0104.

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A manufactured servo system has both current feedback and saturation elements in the servo driver (amplifier). The current feedback is thought to be effective only in reducing the electric time constant of the motor. However, the effects of current feedback are not only the reduction of electric time constant. In this study, the effect of current feedback is clarified by comparing it to a velocity control system without current feedback. In particular, the contribution of the current feedback to saturation elements in servo drivers is clarified. As a result, the influence of the saturation of

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21

Prince, Daryl. "Distributed Control." Mechanical Engineering 121, no. 01 (1999): 68–69. http://dx.doi.org/10.1115/1.1999-jan-6.

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This article discusses servo motion systems, which are motion control systems that combine hardware and software, have innumerable applications in compact modules. Some motion controllers operate on multiple platforms and buses, with units providing analog output to a conventional amplifier, as well as units that provide current control and direct pulse width modulation (PWM) output for as many as 32 motors simultaneously. There are amplifiers that still require potentiometers to be adjusted for the digital drives’ position, velocity, and current control. All major value-adding components of m

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22

Peng, Jian Jun, Yan Jun Liu, Yu Li, and Ji Bin Liu. "Modeling and Stability Analysis of Hydraulic System for Wave Simulation." Applied Mechanics and Materials 291-294 (February 2013): 1934–39. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.1934.

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This thesis put forward a hydraulic wave simulation system based on valve-controlled cylinder hydraulic system, which simulated wave movement on the land. The mathematical model of valve-controlled symmetric cylinder was deduced and the mathematical models of servo valve, displacement sensor and servo amplifier were established according to the schematic diagram of the hydraulic system designed, on the basis of which the mathematical model of hydraulic wave simulation system was obtained. Then the stability of the system was analyzed. The results indicated that the system was reliable.

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23

Liu, Guoping, Zhongbo He, Guo Bai, Jiawei Zheng, Jingtao Zhou, and Ming Chang. "Modeling and Experimental Study of Double-Row Bow-Type Micro-Displacement Amplifier for Direct-Drive Servo Valves." Micromachines 11, no. 3 (2020): 312. http://dx.doi.org/10.3390/mi11030312.

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Giant magnetostrictive actuators (GMA) are widely used in the field of servo valves, but the displacement of GMA is limited, which renders meeting the requirements of large flow direct-drive electro-hydraulic servo valves (DDV) difficult. In order to solve these problems, this study proposes a double-row bow-type micro-displacement amplifier (DBMA), used to increase output displacement of GMA to meet the requirements. This study, by static analysis, analyzes the force of a flexure hinge based on theoretical mechanics and material mechanics, derives the stiffness matrix of the flexure hinge by

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24

Yamazaki, Takanori. "Experimental Study on Dynamic Behavior of High Precision Servo Motor for Machine Tools." Applied Mechanics and Materials 863 (February 2017): 224–28. http://dx.doi.org/10.4028/www.scientific.net/amm.863.224.

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In the field of machining industries it is always required to improve the accuracy of precise products, die and molds. The feed drive system for the machine tools consists of an AC servo motor, an amplifier and rolling elements etc. It is well known that the nonlinear behaviors of the rolling elements influence the motion accuracy of the feed drive system. However, in spite of the analysis of static behaviors have been done, the dynamic behaviors are not so examined. Our special interest is how to control the nonlinear behaviors of the rolling elements and to operate the feed drive system with

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25

Wang, Xin Hua, Wei Li, and Shu Wen Sun. "Research on Flow Characteristics of Slide Valve Used in Water Hydraulic Servo Valve." Applied Mechanics and Materials 29-32 (August 2010): 1651–56. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1651.

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Water hydraulic servo valve has become an important research subject nowadays, and its secondary amplifier usually uses slide valve. Research on flow characteristics of water hydraulic slide valve is important to the design of water hydraulic servo valve. Based on the classical theory of incompressible flow, CFD software FLUENT is used to simulate and analyze the flow characteristics of water hydraulic slide valve. Simulations with different boundary values are applied to the same slide valve in order to guarantee the accuracy of the simulation results. Detailed comparisons are made between th

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26

Han, S.-S., and S.-B. Choi. "Position control of a dual-servo stage featuring an electrorheological fluid clutch and piezostack actuator." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 12 (2004): 1435–48. http://dx.doi.org/10.1243/0954406042690470.

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In this work, a novel type of dual-servo stage system is proposed in order to achieve accurate position control. A bidirectional electrorheological fluid clutch is adopted for a coarse-positioning stage, and a multi-stack piezoceramic actuator associated with a displacement amplifier for a fine-positioning stage. After deriving the dynamic model of the coarse-motion stage, a sliding-mode controller associated with a friction compensator is formulated to achieve robust position control performance. In addition, a model-based feedforward compensator incorporating a conventional proportional-inte

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27

Sędziak, Dariusz, and Roman Regulski. "Design and Investigations into the Piezobender Controlled Servovalve." Solid State Phenomena 220-221 (January 2015): 520–25. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.520.

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Electrohydraulic servo drives can be found in many industrial applications. A typical design of a servovalve uses the known torque motor. The main concept of designing the modification of the servovalve described in the paper was concern about the application of a piezobender as an actuator, working between nozzles as a flapper, at a control stage. The paper presents and investigates the design of a power amplifier for piezobenders and a digital controller for an electrohydraulic servo valve with a piezobender element. The article shows and discusses the main concept of design and the results

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Xu, Weilin, Taotao Wang, Xueming Wei, et al. "Low Noise, High Input Impedance Digital-Analog Hybrid Offset Suppression Amplifier for Wearable Dry Electrode ECG Monitoring." Electronics 9, no. 1 (2020): 165. http://dx.doi.org/10.3390/electronics9010165.

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The portable real-time electrocardiogram (ECG) is a convenient and promising electronic device for cardiovascular diseases patients. However, unlike wet gel electrodes in traditional clinical applications, dry electrodes are competent for comfortable long-time wearing and can prevent skin ulceration. Its ultra-high source impedance and electrode offset (EOS) make traditional chopper amplifiers with low input impedance and limited EOS range difficult to apply to this area. To overcome these challenges, this paper proposes a novel chopper amplifier topology. This architecture includes a gain con

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29

Chen, Chengying, Lixia Bai, Yunrong Zhu, and Tiancheng Wu. "A Wide-Band High-Resolution Transmitter for Optical Isolation Amplifier." Journal of Electrical and Computer Engineering 2020 (March 19, 2020): 1–8. http://dx.doi.org/10.1155/2020/3626401.

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A wide-band and high-resolution transmitter of optical isolation amplifier is proposed for switching power supply isolation and servo motor drive applications. The transmitter is based on the chopper-stabilized technique and sigma delta modulator. A built-in common-mode voltage circuit of switched capacitor is proposed to ensure the stability of input DC common mode. Meanwhile, the feedback capacitor is used to improve the driving ability, which helps to avoid a buffer with large input swing. The circuit is tapeout with GF CMOS 0.18 μm 1P6M process with 5 V power supply. The test results show

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30

Stein, J. L., D. Colvin, G. Clever, and C. H. Wang. "Evaluation of DC Servo Machine Tool Feed Drives as Force Sensors." Journal of Dynamic Systems, Measurement, and Control 108, no. 4 (1986): 279–88. http://dx.doi.org/10.1115/1.3143795.

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Unmanned machine tools as part of an automated factory require reliable, inexpensive sensors to provide machine and process information to the controller. The electric current in the DC motor of a CNC machine tool can be inexpensively measured and used to calculate the tool/workpiece cutting force and the forces associated with drive system components. In order to characterize the bandwidth, sensitivity and accuracy of current monitoring on the feed system of a CNC lathe, a dynamic lumped parameter model of this sensor system is developed. The model is used to identify the system components th

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31

Ma, Jiqing, Bo Zhang, Zhenlin Jiang, and Junchao Li. "A Digital Implementation Method of Control Inner Loop of Ship-borne Servo System Based on PWM Power Amplifier." IOP Conference Series: Earth and Environmental Science 440 (March 19, 2020): 032071. http://dx.doi.org/10.1088/1755-1315/440/3/032071.

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32

Li, Xiao Guang, and Zhen Feng Qu. "Research on Design of a Soccer Robot Control System Based on ARM9 with Analysis of Scientific Materials." Advanced Materials Research 282-283 (July 2011): 429–32. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.429.

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A soccer robot control system based on ARM9 processor with analysis of scientific materials and an embedded operating system UC/OS-II are designed. This system includes a core controller based on S3C2440, a position loop based on LM629, an amplifier based on L298, and software strategy based on UC/OS-II .The experiment result shows that the system has high servo rigidity ,high accuracy and stability, it also a good self-adaptability. The design of the system is feasibility and rationality.

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33

Lee, Sang Kyung, Jun Yeong Lee, Yun Seok Choi, and Hong Bae Park. "Design and Implementation of Motion Control System with Precise Driving Mechanism." Applied Mechanics and Materials 373-375 (August 2013): 134–37. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.134.

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In this paper, a motion control system based on 2-axis gimbal system is designed and implemented to drive a high speed and precision. The proposed system consists of the RS-422 interface, 2-axis gimbal platform, SCU (servo control unit) integrated with a high speed DSP chipset, SAU (servo amplifier unit), potentiometer sensor unit, and resolver sensor unit. The SCU using the DSP firmware is designed to get a fast response without an overshoot with step input and a RMS error of low probability with ramp input. The SAU using a voltage control is designed to resolve the zero-crossing distortion f

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34

Rodríguez-Reséndiz, Juvenal, Fortino Mendoza-Mondragón, Roberto A. Gómez-Loenzo, M. Agustín Martínez-Hernández, and Victor H. Mucino. "An Approach to Motion Control Applications Based on Advanced Programmable Devices." International Journal of Electrical Engineering & Education 49, no. 3 (2012): 243–59. http://dx.doi.org/10.7227/ijeee.49.3.5.

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In this article a methodology for constructing a simple servo loop for motion control applications which is suitable for educational applications is presented. The entire hardware implementation is demonstrated, focusing on a microcontroller-based (μC) servo amplifier and a field programmable gate array-digital signal processor (FPGA-DSP) motion controller. A novel hybrid architecture-based digital stage is featured providing a low-cost servo drive and a high performance controller, which can be used as a basis for an industrial application. Communication between the computer and the controlle

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Chen, Shanshan. "Trajectory Tracking and Control Algorithm for Precision Parallel Robot." Journal of Advanced Computational Intelligence and Intelligent Informatics 23, no. 2 (2019): 237–41. http://dx.doi.org/10.20965/jaciii.2019.p0237.

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When the state of the robot reaches the smooth sliding plane, the current algorithm will generate high-frequency chattering, resulting in larger tracking error and longer response time. To solve these problems, we have proposed a trajectory tracking and control algorithm based on exponential reaching rate. The coordinate system of parallel robot system is established, and the kinetic energy and potential energy of the system are calculated. The results are brought into the Lagarnge equation to find the dynamic model of the system. The power amplifier, electro-hydraulic servo valve, hydraulic c

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Pham, Xuan Thanh, Ngoc Tan Nguyen, Van Truong Nguyen, and Jong-Wook Lee. "A 0.6-µW Chopper Amplifier Using a Noise-Efficient DC Servo Loop and Squeezed-Inverter Stage for Power-Efficient Biopotential Sensing." Sensors 20, no. 7 (2020): 2059. http://dx.doi.org/10.3390/s20072059.

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To realize an ultra-low-power and low-noise instrumentation amplifier (IA) for neural and biopotential signal sensing, we investigate two design techniques. The first technique uses a noise-efficient DC servo loop (DSL), which has been shown to be a high noise contributor. The proposed approach offers several advantages: (i) both the electrode offset and the input offset are rejected, (ii) a large capacitor is not needed in the DSL, (iii) by removing the charge dividing effect, the input-referred noise (IRN) is reduced, (iv) the noise from the DSL is further reduced by the gain of the first st

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Pham, Xuan Thanh, Duc Nha Duong, Ngoc Tan Nguyen, Nguyen Van Truong та Jong-Wook Lee. "A 4.5 GΩ-Input Impedance Chopper Amplifier With Embedded DC-Servo and Ripple Reduction Loops for Impedance Boosting to Sub-Hz". IEEE Transactions on Circuits and Systems II: Express Briefs 68, № 1 (2021): 116–20. http://dx.doi.org/10.1109/tcsii.2020.3007934.

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Kim, Jong, Hankyu Lee, and Hyoungho Ko. "0.6 V, 116 nW Neural Spike Acquisition IC with Self-Biased Instrumentation Amplifier and Analog Spike Extraction." Sensors 18, no. 8 (2018): 2460. http://dx.doi.org/10.3390/s18082460.

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This paper presents an ultralow power 0.6 V 116 nW neural spike acquisition integrated circuit with analog spike extraction. To reduce power consumption, an ultralow power self-biased current-balanced instrumentation amplifier (IA) is proposed. The passive RC lowpass filter in the amplifier acts as both DC servo loop and self-bias circuit. The spike detector, based on an analog nonlinear energy operator consisting of a low-voltage open-loop differentiator and an open-loop gate-bulk input multiplier, is designed to emphasize the high frequency spike components nonlinearly. To reduce the spike d

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Et.al, M. K. Razali. "Smart Pet Feeder System and Big Data Processing to Predict Pet Food Shortage." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (2021): 1858–65. http://dx.doi.org/10.17762/turcomat.v12i3.1015.

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Focusing on pet owners who have tight daily schedule or physically disabled, this project proposed a smart pet feeder system with big data processing to predict pet’s food shortage. The project aims to help pet owners to regularly feed a correct amount of food to their pet as well as to predict the pet’s food shortage. The components used in this system are hx711 load cell amplifier, ultrasonic sensor, infrared sensor and servo motor. The ultrasonic sensor and the servo motor will be connected to adafruit, an internet of things (IoT) platform which provide online dashboard to allow pet owners

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Hao, Xueyuan, and Xiaohong Yan. "Two Improved Cancellation Techniques for Direct-Conversion Receivers." Journal of Electrical and Computer Engineering 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/4253125.

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To solve the problems of carrier leakage and DC offset in direct-conversion receiver (DCR) system, the paper proposed two kinds of improved technology to overcome the problems in DCR system. One is the RF carrier cancellation technology; the traditional cancellation technology based on lumped parameter filter can be easily influenced by distribution parameters, the improved circuits use a 3 db bridge to realize a 180-degree phase shifter, and the method can adapt to a wider range of RF frequency. Another is DC offset cancellation technique; a novel DC servo loop circuit is proposed to replace

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Zhu, Qixin, Bin Yu, Zhipeng Huang, Yan Kang, Xiangdong Kong, and Kaixian Ba. "State feedback-based impedance control for legged robot hydraulic drive unit via full-dimensional state observer." International Journal of Advanced Robotic Systems 17, no. 3 (2020): 172988142092461. http://dx.doi.org/10.1177/1729881420924611.

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In this article, the hydraulic drive unit that drives the movement of the joint of a legged robot was researched, aiming at improving the control accuracy of the position-based impedance control system with dual input and single output. The state feedback control containing more state information of the system was adopted to replace the traditional output feedback and proportional-integral-derivative (PID) control, through the real-time calculation of the time-varying parameters of the servo valve flow, the nonlinear state space expression of the system was derived, the state feedback matrix a

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Altintas, Y. "Prediction of Cutting Forces and Tool Breakage in Milling from Feed Drive Current Measurements." Journal of Engineering for Industry 114, no. 4 (1992): 386–92. http://dx.doi.org/10.1115/1.2900688.

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This paper describes the use of current drawn by feed drive motors for milling process monitoring. A model of a vertical milling machine feed drive control system is used to analyze cutting force measurements from the drive motors. The current and voltage limits in the amplifier, and the friction in the feed drive assembly are included in the analysis. The viability of using armature current as a cutting force measurement sensor is discussed. The pulsating milling forces are predicted from the current measurements at tooth passing frequencies which are within the bandwidth of the servo. It is

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Hubinský, Peter, and Thomas Pospiech. "Slosh-Free Positioning of Containers with Liquids and Flexible Conveyor Belt." Journal of Electrical Engineering 61, no. 2 (2010): 65–74. http://dx.doi.org/10.2478/v10187-010-0010-y.

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Slosh-Free Positioning of Containers with Liquids and Flexible Conveyor Belt This paper describes a method for slosh-free moving of containers with a liquid at which the conveyor belt is flexible. It shows, by means of experimental results, that a container filled with a liquid can be regarded as a damped pendulum. Upon parameter identification of the two single-mode subsystems, theoretical modelling of the complete system is described. With respect to industrial application, feedforward control is used to transfer the container in horizontal direction without sloshing. The applied method requ

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Ferrari, G., M. Kozarski, C. De Lazzari, et al. "A Hybrid (Numerical-physical) Model of the Left Ventricle." International Journal of Artificial Organs 24, no. 7 (2001): 456–62. http://dx.doi.org/10.1177/039139880102400705.

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Hydraulic models of the circulation are used to test mechanical devices and for training and research purposes; when compared to numerical models, however, they are not flexible enough and rather expensive. The solution proposed here is to merge the characteristics and the flexibility of numerical models with the functions of physical models. The result is a hybrid model with numerical and physical sections connected by an electro-hydraulic interface - which is to some extent the main problem since the numerical model can be easily changed or modified. The concept of hybrid model is applied to

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Hellebrekers, L. J., J. F. Liard, A. L. Laborde, A. S. Greene, and A. W. Cowley. "Regional autoregulatory responses during infusion of vasoconstrictor agents in conscious dogs." American Journal of Physiology-Heart and Circulatory Physiology 259, no. 4 (1990): H1270—H1277. http://dx.doi.org/10.1152/ajpheart.1990.259.4.h1270.

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We investigated pressure-dependent autoregulatory responses in mesenteric, iliac, and renal vascular beds of conscious dogs during intravenous infusion of angiotensin II, phenylephrine, or arginine vasopressin at rates which increased arterial pressure by 20-40 mmHg. The arteries supplying these beds were instrumented with an electromagnetic flow probe, a nonoccluding catheter, and an electromagnetic flow probe, a nonoccluding catheter, and an occluder cuff connected with a servo-amplifier, which enabled us to return perfusion pressure to control levels during infusion of the vasoconstrictor a

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Wilkinson, D. "Data Bus Technology Applications—Boeing 777 Autothrottle Servo Motor." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, no. 2 (1996): 181–87. http://dx.doi.org/10.1243/pime_proc_1996_210_359_02.

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On the Boeing 777 aircraft, two autothrottle actuators are required, one for each throttle lever, both controlled by either one of two computers. The consequent potential need for four remote servo-amplifiers has been eliminated by using two ‘smart’ autothrottle servo motor units (ASMs) independently controlled by ARINC 429 data bus rate command signals from the active computer. The development of the B777 ASM from a servo motor unit used on B727 is recounted and the ASM design and ARINC 429 data bus control architecture are described in detail.

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Zhang, Xi, Guo Qing Liu, and Qi Bing Lv. "A Slicer Control System Based on PLC and Servo." Advanced Materials Research 308-310 (August 2011): 1248–51. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1248.

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The slicer control system designed for production plants to manufacture flap disks was investigated using programmable logic controller (PLC) and servo. This system has been mainly developed to achieve the automatic flaps’ cutting and setting. It is implemented by a PLC, a human-machine interface(HMI), a positioning module, and senors, as well as servo amplifiers and motors. In the present work, the effect of response time on multi-axis synchronization has been studied. It was shown that the use of parameter adjustment allows the obtainment of reliable operating characteristic and permits one

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Thomas, Robert, Ronald J. Rapp, Marsha A. Spalding, Robert K. Stix, Maurice E. Kordahi, and Neal S. Bergano. "Technology in Undersea Cable Systems: 50 Years of Progress." Marine Technology Society Journal 49, no. 6 (2015): 88–109. http://dx.doi.org/10.4031/mtsj.49.6.4.

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AbstractUndersea cable systems provide a comprehensive example of how technology has changed during the 50-year publication history of the MTS Journal. From the 125-μm‐diameter glass optical fiber to the 12,000-ton cable ships, the design, manufacture, and installation of undersea communication systems rely on a remarkable intersection of technologies. The technologies supporting this industry have progressed significantly in many aspects. In 1965, coaxial analog systems were transmitting 128 three-kilohertz channels that were amplified by vacuum-tube-based amplifiers for consortiums of nation

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Arafa, H. A., and M. Rizk. "Identification and Modelling of Some Electrohydraulic Servo-Valve Non-Linearities." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 201, no. 2 (1987): 137–44. http://dx.doi.org/10.1243/pime_proc_1987_201_097_02.

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An experiment is designed to investigate electrohydraulic servo-valves with mechanical feedback, excluding the effects of lap conditions and flow forces on the spool. Equilibrium of the armature–flapper assembly is modelled using exact expressions of the decentering magnetic torque on the armature and the hydraulic reaction on the flapper. Evidence is furnished that the feedback wire stiffness must not be constant as it is usually assumed. The parameters used to describe this hitherto unidentified non-linearity are accurately determined by computer simulation. This phenomenon is furthermore fo

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Ajel, Ahmed R., Huda M. Abdul Abbas, and Mohannad Jabbar Mnati. "Position and speed optimization of servo motor control through FPGA." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 1 (2021): 319. http://dx.doi.org/10.11591/ijece.v11i1.pp319-327.

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We have put our model in this paper in which we will be controlling the speed and direction of the servomotor through FPGA. So, as to guarantee the precision from the check control procedure, we have made a project in which the document provides the control plane associated with servo motor depending on Altera DE1 board gentle primary processor as program controller. The system utilizes FPGA since the primary gadget, as well as within Quartus II 10.0 program atmosphere. The associated control components aremade to type a good executable control program in which speed and direction will be cont

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