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Journal articles on the topic 'Position compensation'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Qin, Li Jun, and Chao Xiong. "A Research on Fixed Series Compensation." Advanced Materials Research 986-987 (July 2014): 192–95. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.192.

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Series compensation can improve the line efficiency significantly, reduce line loss and raise line voltage obviously. The paper introduces the basic principles of series compensation, and studies the influence of series compensation’s installation position on compensation effect, the loss reduction effect of series compensation as well as the influence of series compensation on power flow control.

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2

Ma, Wei, Li Zhang, and Jian Lin Yang. "A Study on the System and Mechanism of Ecological Compensation for Coal Mining Areas：Based on the Theory of Complex System." Advanced Materials Research 524-527 (May 2012): 2987–91. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.2987.

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In this paper, mechanism of ecological compensation is taken as a kind of relative position and correlation among supplier, user of compensating resource and regulator of compensation process in the system of ecological compensation, and it is regarded as functions and doing work for system of ecological compensation. On this basis, this article gives the derivation and description of the connotation and extension of system and mechanism of ecological compensation for coal mining areas.

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3

Lunzhu, Dawa, Tao Kui, Ni Ping, Basang Dunzhu, Dong Zhihua, Xu Feng, and Pan Zhiyuan. "Optimization of Reactive Power Compensation Based on Fuzzy Mathematics." E3S Web of Conferences 136 (2019): 01020. http://dx.doi.org/10.1051/e3sconf/201913601020.

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This paper proposes a heuristic method for optimization of reactive power compensation. Firstly, two fuzzy sets of node voltage and cost savings are formed. The compensation location with the greatest compensation suitability is obtained by fuzzy reasoning. Considering the operation modes of several different loads, the mathematical model of reactive power compensation optimization is established, and fuzzy multi-objective optimization is adopted. The method solves the fixed and variable compensation capacity, and calculates the compensation capacity for each existing compensation position cycle until the change does not occur. The above process is repeated until the new compensation position is no longer saved, and finally all the compensation positions, capacity and total savings can be obtained. The example analysis shows the effectiveness and practicability of the method.

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4

Chance, B., D. Schick, R. Hettel, and L. Powers. "Beam intensity and position compensation circuits." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 246, no. 1-3 (May 1986): 400–403. http://dx.doi.org/10.1016/0168-9002(86)90118-x.

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5

Liu, Hong Jun, and Shu Ya Zhi. "High Precision Synchronous Mechanical Motion Hydraulic Compensation Method." Applied Mechanics and Materials 713-715 (January 2015): 810–13. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.810.

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Auxiliary hydraulic system being based on sensor detection is designed to control two execution parts synchronization precision work in main hydraulic lines. To design a servo drive control valve with three working positions, its each position have an oil inlet and two outlets. This valve can come true compensation flow for the single cylinder or all cylinders of the main lines at the same time. Have designed a device is used to control the auxiliary valve-control compensating device by the grating sensor comparison circuit.

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Zeng, Wenhui, Fang Fang, and Xiao Ma. "On-position Measurement Method for Position-error Compensation in Machining." International Journal of Precision Engineering and Manufacturing 22, no. 7 (June 4, 2021): 1179–89. http://dx.doi.org/10.1007/s12541-021-00528-8.

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Yan, Hai Yan, and Tao Zeng. "Simulation of Machining Errors Compensation of CNC Spiral Bevel Gear Grinding Machine." Advanced Materials Research 466-467 (February 2012): 698–703. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.698.

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Taking the eccentricity error of workpiece’s axis as an example, the real cutting pathes on the spiral bevel gear’s tooth surface and the normal errors were obtained according to each machining position. By decoupling error compensation motions, the compensation values of three translational and two rotational axes were obtained. After compensating, the tooth form errors were reduced largely. This compensation method is closer to the fact of gear grinding and the compensation effect is better than the method of adjusting machine setting parameters.

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8

Schmidt, Lasse, Torben O. Andersen, Henrik C. Pedersen, and Michael M. Bech. "Robust Position Tracking for Electro-Hydraulic Drives Based on Generalized Feedforward Compensation Approach." Applied Mechanics and Materials 233 (November 2012): 100–103. http://dx.doi.org/10.4028/www.scientific.net/amm.233.100.

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This paper presents the development of a robust tracking control concept based on accurate feedforward compensation of hydraulic valve-cylinder drives. The proposed feedforward gain is obtained by use of a generalized description of the valve flow that takes into account any asymmetry of valves and/or cylinders, not assuming these asymmetries to be matched, and utilizes pressure measurements. Hence the proposed compensator is generally applicable to any such drive. Simulations show that the proposed compensator poses superior performance and robustness when subjected to strong perturbations in supply pressure and coulomb friction, compared with a conventional constant gain type feedforward compensator.

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9

Sunar, Noorhazirah, Mohd Fua’ad Rahmat, Ahmad ‘Athif Mohd Fauzi, Zool Hilmi Ismail, Siti Marhanis Osman, and Siti Fatimah Sulaiman. "Improved Pole-placement Control with Feed-forward Dead Zone Compensation for Position Tracking of Electro-Pneumatic Actuator System Improved Pole-placement Control with Feed-forward Dead Zone Compensation for Position Tracking of Electro-Pneumatic Actuato." ELEKTRIKA- Journal of Electrical Engineering 20, no. 2 (August 28, 2021): 25–32. http://dx.doi.org/10.11113/elektrika.v20n2.272.

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Dead-zone in the valve degraded the performances of the Electro-Pneumatic Actuator (EPA) system. It makes the system difficult to control, become unstable and leads to chattering effect nearest desired position. In order to cater this issue, the EPA system transfer function and the dead-zone model is identified by MATLAB SI toolbox and the Particle Swarm Optimization (PSO) algorithm respectively. Then a parametric control is designed based on pole-placement approach and combine with feed-forward inverse dead-zone compensation. To reduce chattering effect, a smooth parameter is added to the controller output. The advantages of using these techniques are the chattering effect and the dead-zone of the EPA system is reduced. Moreover, the feed-forward system improves the transient performance. The results are compared with the pole-placement control (1) without compensator and (2) with conventional dead-zone compensator. Based on the experimental results, the proposed controller reduced the chattering effect due to the controller output of conventional dead-zone compensation, 90% of the pole-placement controller steady-state error and 30% and 40% of the pole-placement controller with conventional dead-zone compensation settling time and rise time.

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10

Cooper, E., and R. Hampshire. "Adaptive compensation for position error signal nonlinearity." IEEE Transactions on Magnetics 38, no. 3 (May 2002): 1593–602. http://dx.doi.org/10.1109/20.999135.

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11

Kesner, Samuel B., and Robert D. Howe. "Position Control of Motion Compensation Cardiac Catheters." IEEE Transactions on Robotics 27, no. 6 (December 2011): 1045–55. http://dx.doi.org/10.1109/tro.2011.2160467.

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12

Ge, Rong Yu, Qing Song Wang, and Xu Qiang Shang. "Self-Adaptive Compensation Method on the Tool Position of Roller Gear Cam Surface." Advanced Materials Research 154-155 (October 2010): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.396.

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The roller gear cam surface is often machined by the unequal diameter manufacture method, which means the tool diameter is smaller than that of the roller and the tool position compensation method is most used. For tool position of roller gear cam, it is important to confirm the compensation vector for the tool position compensation method, including compensation value and direction. In the paper, a new self-adaptive tool position optimization method is proposed, which make minimizing the normal machining error as the object function and make two compensation factors as the optimization variables. This algorithm can find out the best compensation direction and value by the tool position optimization for any cam rotation angle and make the tool position self-adaptive and flexible compensation according to the machining error. A numerical calculation example shows that the optimization algorithm can feasibly reduce the machining error. At last a conclusion has been drawn that the radius difference between the tool and the roller is the best compensation value and the best compensation direction is not fixed.

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13

Hong, Lin, Yan Shu Liang, and Meng Cong. "Error Compensation Based on Differential Operators and Electro-Optical Collimation." Applied Mechanics and Materials 44-47 (December 2010): 1568–72. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.1568.

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Theoretical analysis and experiment study on the pose error compensations of parallel mechanisms have been presented. A method for error compensations by means of differential operators and electro-optical collimation system is discussed. Compensation quantities oriented to main error sources from position coordinates of joints on the movable platform can be obtained through mathematic models. Compensation quantities provided by driving legs can be realized precisely by linear calibration techniques. Orientation angles can be measured by means of electro-optical collimation system and a three-dimension turning table, which is centrally positioned and can complete multi-direction inverse adjusting. Numerical example relevant to Stewart platform has been given. Simulation and experiment results indicate the feasibility of the method.

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14

Matović, Ivana Marinović. "Comparative Analysis of Executive Compensation in the Republic of Serbia and EU Countries." Economic Themes 57, no. 2 (June 1, 2019): 181–200. http://dx.doi.org/10.2478/ethemes-2019-0011.

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AbstractExecutive compensations have a strong motivation role in contemporary business organizations. Adequate models of compensation enable attracting and retaining the high-capacity managers. This way, business organization conquers and maintains the competitive position in the context of globalization. It is necessary to align the executive compensation with the business organization’s strategy, which requires careful process of planning, done by the highest levels of management and ownership. The main objective of the paper is to explore and compare the structure and the level of executive compensation in the Republic of Serbia and EU countries. The paper focuses on executive compensation components, primarily long-term and short-term incentives, as well as sallary and benefits. A comparative analysis of executive compensation models was performed to explain the differences in the observed countries.The study found large and disproportionate differences in the executive compensation levels, conditioned mostly by the economic development of the observed economies.

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15

Wei, Zhouxiang, Zhiwen Huang, and Jianmin Zhu. "Position Control of Magnetic Levitation Ball Based on an Improved Adagrad Algorithm and Deep Neural Network Feedforward Compensation Control." Mathematical Problems in Engineering 2020 (December 21, 2020): 1–13. http://dx.doi.org/10.1155/2020/8935423.

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To control the position of the magnetic levitation ball more accurately, this paper proposes a deep neural network feedforward compensation controller based on an improved Adagrad optimization algorithm. The control structure of the controller consists of a deep neural network identifier, a deep neural network feedforward compensator, and a PID controller. First, the dynamic inverse model of the magnetic levitation ball is established by the deep neural network identifier which is trained online based on the improved Adagrad algorithm, and the trained network parameters are dynamically copied to the deep neural network feedforward compensator. Then, the position control of the magnetic levitation ball system is realized by the output of the feedforward compensator and the PID controller. Simulations and experiments illustrate that the accuracy of the deep network feedforward compensation control based on an improved Adagrad algorithm is higher, and its control system shows good dynamic and static performance and robustness to some extent.

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16

Zhaoxing, Lu, Fang Jiancheng, Gong Xiaolin, Li Jianli, Wang Shicheng, and Wang Yun. "Dynamic Lever Arm Error Compensation of POS Used for Airborne Earth Observation." International Journal of Aerospace Engineering 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/9464568.

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The position and orientation system (POS) is widely applied in airborne Earth observation, which integrates the strapdown inertial navigation system (SINS) and global positioning system (GPS) to provide high-accuracy position, velocity, and attitude information for remote sensing motion compensation. However, for keeping the appointed direction of remote sensing load, the inertial measurement unit (IMU) and remote sensing load will be driven to sweep by the servo machine. The lever arms among IMU, GPS, and remote sensing load will be time varying, and their influence on the measurement accuracy of POS is serious. To solve the problem, a dynamic lever arm error compensation method is proposed, which contains the first-level lever arm error compensations between IMU and GPS and the second-level lever arm error compensation between POS and remote sensing load. The flight experiment results show that the proposed method can effectively compensate the dynamic lever arm error and achieve high measurement accuracy for POS.

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17

MA Li, 马. 立., 王敬萍 WANG Jing-ping, 李丰甜 LI Feng-tian, 曾佑轩 ZENG You-xuan, and 刘志龙 LIU Zhi-long. "Friction modeling and compensation of precision position system." Optics and Precision Engineering 27, no. 1 (2019): 121–28. http://dx.doi.org/10.3788/ope.20192701.0121.

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18

Cetinkunt, Sabri, and Ray-Long Tsai. "Position error compensation of robotic contour end-milling." International Journal of Machine Tools and Manufacture 30, no. 4 (January 1990): 613–27. http://dx.doi.org/10.1016/0890-6955(90)90011-7.

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19

Seco, Fernando, José Miguel Martín, José Luis Pons, and Antonio Ramón Jiménez. "Hysteresis compensation in a magnetostrictive linear position sensor." Sensors and Actuators A: Physical 110, no. 1-3 (February 2004): 247–53. http://dx.doi.org/10.1016/j.sna.2003.09.031.

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20

Kontaras, Nikolaos, Marcel Heertjes, and Hans Zwart. "Continuous compliance compensation of position-dependent flexible structures." IFAC-PapersOnLine 49, no. 13 (2016): 76–81. http://dx.doi.org/10.1016/j.ifacol.2016.07.930.

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21

Situm, Z., D. Pavkovic, and B. Novakovic. "Servo Pneumatic Position Control Using Fuzzy PID Gain Scheduling." Journal of Dynamic Systems, Measurement, and Control 126, no. 2 (June 1, 2004): 376–87. http://dx.doi.org/10.1115/1.1767857.

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In this paper, a design procedure and experimental implementation of a PID controller is presented. The PID controller is tuned according to damping optimum in order to achieve precise position control of a pneumatic servo drive. It is extended by a friction compensation and stabilization algorithm in order to deal with friction effects. In a case of supply pressure variations, more robust control system is needed. It is implemented by extending the proposed PID controller with friction compensator with the gain scheduling algorithm, which is provided by means of fuzzy logic. The effectiveness of proposed control algorithms is experimentally verified on an industrial cylindrical rodless actuator controlled by a proportional valve.

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22

Xu, Rui, Mengyu Ding, Ya Qi, Shuai Yue, and Jianye Liu. "Performance Analysis of GNSS/INS Loosely Coupled Integration Systems under Spoofing Attacks." Sensors 18, no. 12 (November 23, 2018): 4108. http://dx.doi.org/10.3390/s18124108.

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The loosely coupled integration of Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) have been widely used to improve the accuracy, robustness and continuity of navigation services. However, the integration systems possibly affected by spoofing attacks, since integration algorithms without spoofing detection would feed autonomous INSs with incorrect compensations from the spoofed GNSSs. This paper theoretically analyzes and tests the performances of GNSS/INS loosely coupled integration systems with the classical position fusion and position/velocity fusion under typical meaconing (MEAC) and lift-of-aligned (LOA) spoofing attacks. Results show that the compensations of Inertial Measurement Unit (IMU) errors significantly increase under spoofing attacks. The compensations refer to the physical features of IMUs and their unreasonable increments likely result from the spoofing-induced inconsistency of INS and GNSS measurements. Specially, under MEAC attacks, the IMU error compensations in both the position-fusion-based system and position/velocity-fusion-based system increase obviously. Under LOA attacks, the unreasonable compensation increments are found from the position/velocity-fusion-based integration system. Then a detection method based on IMU error compensations is tested and the results show that, for the position/velocity-fusion-based integration system, it can detect both MEAC and LOA attacks with high probability using the IMU error compensations.

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23

Shen, Xiao Long, Jia Ying Hu, Ming Jun Zhang, and Lai Xi Zhang. "Experimental Study on Backlash Compensation of CNC Machine Tool." Advanced Materials Research 580 (October 2012): 419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.580.419.

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The backlash compensation has a great effect on the synthetical precision of CNC machine tool. Here, the measuring and backlash compensating technologies were investigated for high-speed CNC machine tool. Following, the backlash compensation of the synthetical geometric error of the interpolatimg movement and the evaluation system of position accuracy were proposed during CNC machine tool processing. The results indicate that the basic feature of error is established and provides a basis for putting forward the new error measurement method under the essential measuring condition. It also could be applied for different types of error compensation, shows that the backlash of the milling processing could be well compensated.

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Baba, Shinnosuke, Keiichi Nakamoto, and Yoshimi Takeuchi. "Multi-Axis Control Ultraprecision Machining Based on Tool Setting Errors Compensation." International Journal of Automation Technology 10, no. 1 (January 4, 2016): 114–20. http://dx.doi.org/10.20965/ijat.2016.p0114.

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Initial position errors generated while setting cutting tools can deteriorate machining accuracy. However, because of the manual setting process, it is difficult to prevent the tool setting errors, which can increase in accordance with the number of the control axes. These errors make it difficult to locate the tool accurately at the correct position in multi-axis control machining. Therefore, this study aims to achieve multi-axis control ultraprecision machining based on tool setting errors compensation. From the conducted experiments, it is found that the proposed method is effective for compensating the tool setting errors in multi-axis control ultraprecision machining.

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Park, Gwangmin, Gyeongil Kim, and Bon-Gwan Gu. "Sensorless PMSM Drive Inductance Estimation Based on a Data-Driven Approach." Electronics 10, no. 7 (March 26, 2021): 791. http://dx.doi.org/10.3390/electronics10070791.

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In the permanent magnet synchronous motor (PMSM) sensorless drive method, motor inductance is a decisive parameter for rotor position estimation. Due to core magnetic saturation, the motor current easily invokes inductance variation and degrades rotor position estimation accuracy. For a constant load torque, saturated inductance and inductance error in the sensorless drive method are constant. Inductance error results in constant rotor position estimation error and minor degradations, such as less optimal torque current, but no speed estimation error. For a periodic load torque, the inductance parameter error periodically fluctuates and, as a result, the position estimation error and speed error also periodically fluctuate. Periodic speed error makes speed regulation and load torque compensation especially difficult. This paper presents an inductance parameter estimator based on polynomial neural network (PNN) machine learning for PMSM sensorless drive with a period load torque compensator. By applying an inductance estimator, we also proposed a magnetic saturation compensation method to minimize periodic speed fluctuation. Simulation and experiments were conducted to validate the proposed method by confirming improved position and speed estimation accuracy and reduced system vibration against periodic load torque.

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26

Zhou, Kui, Si Tu Yu, Ming Heng Xu, and Shi De Xiao. "Study on the Algorithm of Tool Compensation for Rotary Center Offset in 5-Axis Machining." Advanced Materials Research 156-157 (October 2010): 894–99. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.894.

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In 5-axis NC machining, if the worktable rotary center or the cutting tool swivel center offset, in program blocks, the cutting tool position will also change and the compensation is needed. The author studies the mathematic relationship among the rotary center offset values, rotary angle A, B and C and the cutting tool position compensation values and designs the computer automatic processing algorithm which can rapidly and accurately calculate the compensation values for position change of the cutting tool and amend the cutting tool position in program blocks so as to obtain a practical NC program.

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27

Li, Na, Ziyan Hao, Haiyong Jiang, and Bo Yu. "Positioning Control of a Human-Machine Cooperative Grafting Manipulator for Unstructured Environments." Transactions of the ASABE 63, no. 5 (2020): 1477–91. http://dx.doi.org/10.13031/trans.13817.

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HighlightsPositioning of a human-machine cooperative grafting manipulator for high-crown grafting of fruit trees is analyzed.PID control based on feedforward compensation of a dynamic model can realize high-precision position control of the braking process in unstructured agricultural environments.A manipulator based on the proposed control method can realize accurate position control and time-varying operating forces and can provide energy savings to meet the requirements of field operations.Abstract. Crown grafting of fruit trees has the disadvantages of high labor intensity and reduced graft survival. Therefore, a human-machine cooperative manipulator that relies on passive joint braking was designed to realize position control. The manipulator can replace manual operations to solve the problem of different positions in the grafting process and provide positioning and force support for canopy grafting. This study determined that the working space of the manipulator can cover the canopy area of fruit trees. Dynamic equations were established for motion simulation and feedforward compensation control of the manipulator. According to the dynamic model, the joint braking process was simulated. The simulation results showed that the joint braking torque needs to be dynamically controlled to ensure positioning accuracy of the manipulator. A process of passive joint braking was designed based on the proposed ideal braking curve. By comparing the position control accuracy of independent proportional integral derivative (PID) control, dynamic model feedforward compensation control, and PID control based on feedforward compensation of the dynamic model in simulations, it was determined that PID control based on feedforward compensation of the dynamic model was suitable for application in the braking torque control system. Finally, prototype tests showed that PID control based on feedforward compensation of the dynamic model can realize high-precision joint braking and position control of the manipulator. The positioning error was less than 5%, and the maximum vibration acceleration amplitude was reduced by 26.7% to 68.5%. The control system of the manipulator, using PID control based on feedforward compensation of the dynamic model, can provide adaptability for unstructured environments and reduce power consumption for application in field operations. Keywords: Controls, Dynamics, Grafting, Positioning, Simulation models, Unstructured agricultural environment.

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28

Ryu, Taebeum. "Application of Soft Tissue Artifact Compensation Using Displacement Dependency between Anatomical Landmarks and Skin Markers." Anatomy Research International 2012 (July 19, 2012): 1–10. http://dx.doi.org/10.1155/2012/123713.

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Soft tissue artifact is known to be one of the main sources of errors in motion analysis by means of stereophotogrammetry. Among many approaches to reduce such errors, one is to estimate the position of anatomical landmarks during a motion with joint angle or displacement of skin markers, which is the so-called compensation method of anatomical landmarks. The position of anatomical landmarks was modeled from the data of the so-called dynamic calibration, in which anatomical landmark positions are calibrated in an ad hoc motion. This study aimed to apply the compensation methods with joint angle and skin marker displacement to three lower extremity motions (walking, sit-to-stand/stand-to-sit, and step up/down) in ten healthy males and compare their reliability. To compare the methods, two sets of kinematic variables were calculated using two different marker clusters, and the difference was obtained. Results showed that the compensation method with skin marker displacement had less differences by 30–60% compared to without compensation. In addition, it had significantly less difference in some kinematic variables (7 of 18) by 25–40% compared to the compensation method with joint angle.

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29

Christopoulos, Vassilios N., and Paul R. Schrater. "An Optimal Feedback Control Framework for Grasping Objects with Position Uncertainty." Neural Computation 23, no. 10 (October 2011): 2511–36. http://dx.doi.org/10.1162/neco_a_00180.

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As we move, the relative location between our hands and objects changes in uncertain ways due to noisy motor commands and imprecise and ambiguous sensory information. The impressive capabilities humans display for interacting and manipulating objects with position uncertainty suggest that our brain maintains representations of location uncertainty and builds compensation for uncertainty into its motor control strategies. Our previous work demonstrated that specific control strategies are used to compensate for location uncertainty. However, it is an open question whether compensation for position uncertainty in grasping is consistent with the stochastic optimal feedback control, mainly due to the difficulty of modeling natural tasks within this framework. In this study, we develop a stochastic optimal feedback control model to evaluate the optimality of human grasping strategies. We investigate the properties of the model through a series of simulation experiments and show that it explains key aspects of previously observed compensation strategies. It also provides a basis for individual differences in terms of differential control costs—the controller compensates only to the extent that performance benefits in terms of making stable grasps outweigh the additional control costs of compensation. These results suggest that stochastic optimal feedback control can be used to understand uncertainty compensation in complex natural tasks like grasping.

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30

Čeperković, Vladimir, and Vujo Drndarević. "A method for selfcalibration of a magneto-resistive angular position sensor in servo systems." Tehnika 75, no. 4 (2020): 469–76. http://dx.doi.org/10.5937/tehnika2004469c.

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Magneto-resistive and Hall angular position sensors are frequently used in servo systems, due to their reliability, longevity, and tolerance to environmental conditions. In this paper, a measurement error compensation is integrated into the servo system control structure. The compensation consists of two steps: a linear compensation of the magnetic field vector measurement error, and harmonic compensation of the angular position measurement error. The selfcalibration method uses data collected during rotation with maximal speed to identify parameters of the measurement process model. Identification is executed periodically, each time when the shaft makes a full rotation. The least squares method is utilized for identification of the linear compensation parameters, while the average rotational speed is used as an internal reference for the harmonic compensation parameters identification. The method, together with a fast convergence, increases the measurement accuracy by an order of magnitude. Experimentally achieved measurement error is below 0.7°, with residual variance below 0.05°, comparable with sensor differentiability.

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31

Armange, Roseline, and Etienne Mullet. "Slave descendants’ views regarding national policies on reparations: A Martinican perspective." Social Science Information 55, no. 4 (July 9, 2016): 511–30. http://dx.doi.org/10.1177/0539018416658150.

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The present study concerned the views regarding the acceptability of possible national policies related to slavery by people whose families were directly affected in the past. It was conducted in the island of Martinique (an overseas French department), and 298 descendants of slaves participated. Three qualitatively different personal positions were found; these positions were designated Skeptics (28% of the sample), Reparationists (35%) and Undetermined (37%). For people holding a Skeptic position, nothing meaningful can be done to repair the horrors of slavery. However a national policy that includes public acknowledgment of past wrongs can be considered as tolerable provided it is accompanied by material compensations. For people holding a Reparationist position, any national policy that involves public acknowledgment of past wrongs is considered as acceptable, whether or not it is accompanied by material compensation. Policies of amnesia and/or exaltation of the past or policies that involve only material compensations are viewed as not acceptable. In addition reparation policies are considered as more acceptable in cases where socio-economic integration of slave descendants has been achieved than in cases where it has not. For people holding an Undetermined position, slavery and the slave trade are part of the deep past; as a result, it is difficult to have strong views about it or about related policies. These three personal positions were related to educational level and religious involvement in a meaningful way. In particular, undetermined people were less educated and more religious than others.

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32

Li, Ke, Yeming Zhang, Shaoliang Wei, and Hongwei Yue. "Evolutionary Algorithm-Based Friction Feedforward Compensation for a Pneumatic Rotary Actuator Servo System." Applied Sciences 8, no. 9 (September 12, 2018): 1623. http://dx.doi.org/10.3390/app8091623.

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The friction interference in the pneumatic rotary actuator is the primary factor affecting the position accuracy of a pneumatic rotary actuator servo system. The paper proposes an evolutionary algorithm-based friction-forward compensation control architecture for improving position accuracy. Firstly, the basic equations of the valve-controlled actuator are derived and linearized in the middle position, and the transfer function of the system is further obtained. Then, the evolutionary algorithm-based friction feedforward compensation control architecture is structured, including that the evolutionary algorithm is used to optimize the controller coefficients and identify the friction parameters. Finally, the contrast experiments of four control strategies (the traditional PD control, the PD control with friction feedforward compensation without evolutionary algorithm tuning, the PD control with friction feedforward compensation based on the differential evolution algorithm, and the PD control with friction feedforward compensation based on the genetic algorithm) are carried out on the experimental platform. The experimental results reveal that the evolutionary algorithm-based friction feedforward compensation greatly improves the position tracking accuracy and positioning accuracy, and that the differential evolution-based case achieves better accuracy. Also, the system with the friction feedforward compensation still maintains high accuracy and strong stability in the case of load.

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33

Chen, Lifang, Bo Zhou, Zhaoju Li, Yixiang Guo, and Ziwen Yan. "An Optimized Pulse-Counting Method for Compensation Vector Calculation in the Automatic Balancer." Shock and Vibration 2020 (May 31, 2020): 1–9. http://dx.doi.org/10.1155/2020/8402864.

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The accuracy of the counterweight positions in an automatic balancing system deeply affects dynamic balancing. Compensation vector is synthesized by the two counterweights located in the electromagnetic dual-weight automatic balancer. Therefore, if the position of the counterweight is inaccurate, it may result in a wrong adjustment and a larger imbalance of the rotor system. In this paper, an optimized pulse counting method for compensation vector calculation in an electromagnetic dual-weight balancing system is proposed based on a programmable logic controller (PLC). A propeller automatic balancing simulation test bench is used to verify the effect of the method by obtaining the positions of the counterweights and synthesizing the compensation vector in the working mode. The error is less than 1/80 which means that it does not exceed one step in the 80-position-balancer at 1200 rpm. The proposed control system can work without computers or high-speed data acquisition equipment, which improves the stability and flexibility of the control system, facilitates the design of the automatic balancing system, and shows excellent potential for industrial applications.

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34

Kim, D. T., and Z. J. Zhang. "Position Control of a Pneumatic Cylinder Considering Friction Compensation." Journal of The Korean Society for Fluid Power & Construction Equipments 10, no. 1 (March 1, 2013): 1–6. http://dx.doi.org/10.7839/ksfc.2013.10.1.001.

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Senjyu, Tomonobu, Satoru Yokoda, and Katsumi Uezato. "Position Control of Ultrasonic Motors with Dead-zone Compensation." IEEJ Transactions on Industry Applications 119, no. 4 (1999): 494–500. http://dx.doi.org/10.1541/ieejias.119.494.

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Ahn, Ji-Hae, Hyung-Jin Ahn, and Joon-Yeol Park. "Position Error Compensation Method for Resolvers using Kalman Filter." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 29, no. 5 (May 29, 2015): 50–56. http://dx.doi.org/10.5207/jieie.2015.29.5.050.

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YANG, Qing-hai, Yukio KAWAKAMI, and Sunao KAWAI. "Position Control of a Pneumatic Cylinder with Friction Compensation." Hydraulics & Pneumatics 28, no. 2 (1997): 245–51. http://dx.doi.org/10.5739/jfps1970.28.245.

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38

Akutsu, Shuhei, Hiromu Sekiguchi, Takahiro Nozaki, and Toshiyuki Murakami. "Position and Torque Sensorless Motion Transmission Using Voltage Compensation." IEEJ Journal of Industry Applications 7, no. 2 (2018): 150–57. http://dx.doi.org/10.1541/ieejjia.7.150.

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39

Van den Braembussche, P., J. Swevers, and H. Van Brussel. "Linear Motor Ripple Compensation Using Position-Triggered Repetitive Control." IFAC Proceedings Volumes 31, no. 27 (September 1998): 353–57. http://dx.doi.org/10.1016/s1474-6670(17)40053-x.

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40

Hyuk Choi, Jun. "Position Compensation Method of BLDC Motor for Automotive Applications." IOSR Journal of Engineering 3, no. 01 (January 2013): 49–55. http://dx.doi.org/10.9790/3021-03114955.

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Han, Woo-yong, Sang-min Kim, and Chang-goo Lee. "Induction Motor Position Servo Drives with Rotor Resistance Compensation." IFAC Proceedings Volumes 33, no. 20 (July 2000): 393–98. http://dx.doi.org/10.1016/s1474-6670(17)38082-5.

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42

Lim, Hyuk, Jin-Woo Seo, and Chong-Ho Choi. "Torsional displacement compensation in position control for machining centers." Control Engineering Practice 9, no. 1 (January 2001): 79–87. http://dx.doi.org/10.1016/s0967-0661(00)00076-9.

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43

Song, G., L. Cai, and Y. Wang. "Robust friction compensation for precise and smooth position regulation." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 213, no. 2 (March 1999): 157–61. http://dx.doi.org/10.1243/0959651991540467.

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44

Huang, Jin, Xiaoyang Zhao, and Jianyu Fan. "Adaptive Ink Droplet Position Compensation in Three Dimensional Printing." Advanced Science Letters 6, no. 1 (March 15, 2012): 333–36. http://dx.doi.org/10.1166/asl.2012.2214.

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45

Andrew, Rex K., Michael R. Zarnetske, Bruce M. Howe, and James A. Mercer. "Ship-Suspended Acoustical Transmitter Position Estimation and Motion Compensation." IEEE Journal of Oceanic Engineering 35, no. 4 (October 2010): 797–810. http://dx.doi.org/10.1109/joe.2010.2077750.

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Bajracharya, Max, Matthew DiCicco, Paul Backes, and Kevin Nickels. "Visual end-effector position error compensation for planetary robotics." Journal of Field Robotics 24, no. 5 (2007): 399–420. http://dx.doi.org/10.1002/rob.20186.

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47

Zhao, Xiaoyang, and Jin Huang. "Ink Droplet Position Compensation Based on Extended State Observer." International Journal of Automation Technology 5, no. 5 (September 5, 2011): 629–33. http://dx.doi.org/10.20965/ijat.2011.p0629.

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The parabolic droplet trajectory in inkjet printing causes errors between actual position and expected positioning, deteriorating printing quality in highspeed printing. To improve printing quality and increase printing speed, an accurate firing time estimation method is proposed to compensate the droplet position error. A speed estimator based on the extended state observer is designed to estimate carriage speed on-line, based on which, the exact firing time for droplet position compensation is calculated. Simulation result shows the effectiveness of carriage velocity estimation, and experimental results show that the printing quality is markedly improved.

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Park, Joon Sung, Ki-Doek Lee, Sung Gu Lee, and Won-Ho Kim. "Unbalanced ZCP Compensation Method for Position Sensorless BLDC Motor." IEEE Transactions on Power Electronics 34, no. 4 (April 2019): 3020–24. http://dx.doi.org/10.1109/tpel.2018.2868828.

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Montalvo, William, Juan Escobar-Naranjo, Carlos A. Garcia, and Marcelo V. Garcia. "Low-Cost Automation for Gravity Compensation of Robotic Arm." Applied Sciences 10, no. 11 (May 31, 2020): 3823. http://dx.doi.org/10.3390/app10113823.

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During the Industry 4.0 era, the open source-based robotic arms control applications have been developed, in which the control algorithms apply for movement precision in the trajectory tracking paths based on direct or reverse kinematics. Therefore, small errors in the joint positions can summarize in large position errors of the end-effector in the industrial activities. Besides the change of the end-effector position for a given variation of the set-point in manipulator joint positions depends on the manipulator configuration. This research proposes a control based on Proportional Derivative (PD) Control with gravity compensation to show the robustness of this control scheme in the robotic arm’s industrial applications. The control algorithm is developed using a low-cost board like Raspberry Pi (RPI) where the Robot Operating System (ROS) is installed. The novelty of this approach is the development of new functions in ROS to make the PD control with gravity compensation in low-cost systems. This platform brings a fast exchange of information between the Kuka™ youBot robotic arm and a graphical user’s interface that allows a transparent interaction between them.

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Zha, Chang Li, Chen Ning Wang, and Shi Jun Chen. "Design of NC Machine Tools Self-Compensation System Based on FPGA." Applied Mechanics and Materials 278-280 (January 2013): 1442–46. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.1442.

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NC machine tools are generally thought to be with a high degree of automation, high precision, high reliability and high efficiency characteristics. But because of the inherent flaws of the machine mechanical structure, such as screw wear, assembly errors or repeated positioning error, the machining accuracy may reduce. Therefore, this paper describes a self-compensating system design FPGA-based NC machine tools. Using Programmable devices(FPGA) and Hardware description language(VHDL) to achieve self-compensation system controller development, Position measurement from absolute encoder in real-timing, Comprehensive building of NC machine tools since compensation control system.

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