scholarly journals Trajectory Control of Pneumatic Servo Table with Air Bearing

2011 ◽  
Vol 5 (6) ◽  
pp. 800-808 ◽  
Author(s):  
Jun Li ◽  
◽  
Kotaro Tadano ◽  
Kenji Kawashima ◽  
Toshinori Fujita ◽  
...  
Keyword(s):  
High Performance ◽  
Control Design ◽  
Trajectory Control ◽  
Pneumatic Actuator ◽  
Pneumatic Cylinder ◽  
Air Bearing ◽  
Order Model ◽  
Servo Valve ◽  
High Dynamics ◽  
Low Dimensional

This paper proposes a trajectory control design for a pneumatic servo table system. The control design takes into consideration the dynamics of the pneumatic actuator, connected pipeline and servo valve. The system is mainly composed of a pneumatic actuator, high-performance pneumatic servo valves and pipelines. The pneumatic actuator utilizes a pneumatic cylinder with air bearing. The servo valve, which has high dynamics up to 300 Hz, is connected to the pneumatic actuator by pipelines. A linear model which takes into consideration the dynamics of the pipeline and servo valve is designed to simulate the system. Experiment results suggest that with 7thorder control model the system can be accurately represented. However, a low-dimensional model is necessary for practical use. The analysis shows that in the pole loci of the 7thorder model, two poles are much farther from the imaginary axis than are the other five poles. Therefore, the model can be reduced to one of the 5thorder. By comparing the simulation and experiment results, we confirm that the 5thorder model can also match the system well. Based on this result, a 5thorder feed forward has been designed. When a curve which can be derived five times is inputted, the experiment results show that the maximum trajectory error has been reduced by 20 µm.

Integrated Control Design of Pneumatic Servo Table Considering the Dynamics of Pipelines and Servo Valve

2011 ◽  
Vol 5 (4) ◽  
pp. 485-492 ◽  
Author(s):  
Jun Li ◽  
◽  
Joonmyeong Choi ◽  
Kenji Kawashima ◽  
Toshinori Fujita ◽  
...  
Keyword(s):  
Linear Model ◽  
Integrated Control ◽  
Control Design ◽  
Pneumatic Actuator ◽  
Pneumatic Cylinder ◽  
Order Model ◽  
Servo Valve ◽  
Comparison Results ◽  
Valve Dynamics ◽  
High Dynamics

In this paper, integrated control design for the pneumatic servo table system considering the dynamics of pipelines and servo valve is studied. The table is mainly composed by a pneumatic actuator, a highperformance pneumatic servo valve and pipelines. The pneumatic actuator utilizes a pneumatic cylinder with air bearings. The servo valve has high dynamics up to 300 Hz and is connected to the pneumatic actuator by pipelines. The system is pneumatically driven, providing the advantages of low heat generation and non-magnetic, nature suited to precise positioning. To simulate the system, we designed a linear model considering pipelines and servo valve dynamics. Comparison results showed that with a 7thorder linear model, the discrepancy between experiment and simulation results was much smaller than when using a 3rdorder model. The model’s complexity made it necessary to reduce the model’s order. Two poles are much further from the imaginary axis compared with other five poles in the pole loci of the 7thorder model, so the model is reduced to a 5thorder. A comparison of simulation and experiment results showed that the 5thorder model matches the real system well.

scholarly journals Development of a Four-Way Pinch-Type Servo Valve for Pneumatic Actuator

2020 ◽  
Vol 10 (3) ◽  
pp. 1066
Author(s):  
Kotaro Tadano ◽  
Yasumasa Ishida ◽  
Hisami Takeishi
Keyword(s):  
Position Control ◽  
Flow Characteristics ◽  
Pneumatic Actuator ◽  
Pneumatic Cylinder ◽  
Heavy Load ◽  
Servo Systems ◽  
Air Compressor ◽  
Servo Valve ◽  
Robot Systems ◽  
Control Application

Pneumatic servo valves are key components of pneumatic servo systems. Multi-degree-of-freedom systems, such as robot systems, utilize many servo valves to control their actuators. However, conventional servo valves always consume air due to leakage even when the pneumatic actuator is not moving. Hence, the consumption flow rate of the entire system corresponds to a heavy load on the air compressor. Reduction in the leakage of servo valves contributes to lower requirements for the air compressor and saves energy. In this study, we develop a four-way pinch- type pneumatic servo valve that controls flow rates by pinching air tubes to realize a leak-free servo valve. A cam to control the aperture of the flow channel is newly designed, and a control system is established. Measurement results indicate high linearity in static flow characteristics and high dynamic characteristics corresponding to 30 Hz. We experimentally confirm a good position tracking property in the position control of a pneumatic cylinder by using the developed valve. Finally, evaluation results of air consumption in a robotic control application indicate that the developed valve contributes to a significant reduction in air consumption compared to that of a conventional spool-type valve.

Reasonably designed 2D WS2 and CdS microwire heterojunction for high performance photoresponse

Nanoscale ◽  
2021 ◽  
Author(s):  
Z.Q. Zheng ◽  
Yuchen Zhou ◽  
Wei Gao ◽  
Li Zhang ◽  
Mengmeng Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Low Dimensional ◽  
Low Dimensional Materials

Heterojunctions based on low-dimensional materials can combine the superiorities of each composition and realize novel properties. Herein, a mixed-dimensional heterojunction comprising multilayer WS2, CdS microwire and few-layer WS2 has been...

Two-Run Genetic Programming for Predicting Slump Flow of Concrete

2014 ◽  
Vol 590 ◽  
pp. 321-325
Author(s):  
Li Chen ◽  
Chang Huan Kou ◽  
Kuan Ting Chen ◽  
Shih Wei Ma
Keyword(s):  
Nonlinear Systems ◽  
Genetic Programming ◽  
High Performance ◽  
Mean Squared Error ◽  
High Performance Concrete ◽  
Local Optimum ◽  
Root Mean Squared Error ◽  
Squared Error ◽  
Slump Flow ◽  
Low Dimensional

A two-run genetic programming (GP) is proposed to estimate the slump flow of high-performance concrete (HPC) using several significant concrete ingredients in this study. GP optimizes functions and their associated coefficients simultaneously and is suitable to automatically discover relationships between nonlinear systems. Basic-GP usually suffers from premature convergence, which cannot acquire satisfying solutions and show satisfied performance only on low dimensional problems. Therefore it was improved by an automatically incremental procedure to improve the search ability and avoid local optimum. The results demonstrated that two-run GP generates an accurate formula through and has 7.5 % improvement on root mean squared error (RMSE) for predicting the slump flow of HPC than Basic-GP.

Optimal Simultaneous Kinematic, Dynamic and Control Design of High Performance Manipulators Based on Trajectory Pattern Method

1998 ◽  
Author(s):  
J. Rastegar ◽  
L. Liu ◽  
M. Mattice
Keyword(s):  
High Speed ◽  
High Performance ◽  
Optimality Criterion ◽  
Control Design ◽  
Tracking Errors ◽  
Motion Patterns ◽  
Trajectory Pattern ◽  
And Control ◽  
Velocity Tracking ◽  
Trajectory Pattern Method

Abstract An optimal simultaneous kinematic, dynamic and control design approach is proposed for high performance computer controlled machines such as robot manipulators. The approach is based on the Trajectory Pattern Method (TPM) and a fundamentally new design philosophy that such machines in general and ultra-high performance machines in particular must only be designed to perform a class or classes of motions effectively. In the proposed approach, given the structure of the manipulator, its kinematic, dynamic and control parameters are optimized simultaneously with the parameters that describe the selected trajectory pattern. In the example presented in this paper, a weighted sum of the norms of the higher harmonics appearing in the actuating torques and the integral of the position and velocity tracking errors are used to form the optimality criterion. The selected optimality criterion should yield a system that is optimally designed to accurately follow the specified trajectory at high speed. Other objective functions can be readily formulated to synthesize systems for optimal performance. The potentials of the developed method and its implementation for generally defined motion patterns are discussed.

scholarly journals Modeling and constrained optimal design of an ultra-low-friction pneumatic cylinder with air bearing

2019 ◽  
Vol 11 (4) ◽  
pp. 168781401983987
Author(s):  
Jian Cao ◽  
Xiaocong Zhu ◽  
Feiteng Li ◽  
Xin Jin
Keyword(s):  
Optimal Design ◽  
Pneumatic Cylinder ◽  
Air Bearing ◽  
Low Friction

scholarly journals Recent advances in low‐dimensional semiconductor nanomaterials and their applications in high‐performance photodetectors

InfoMat ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 291-317 ◽  
Author(s):  
Jingzhi Fang ◽  
Ziqi Zhou ◽  
Mengqi Xiao ◽  
Zheng Lou ◽  
Zhongming Wei ◽  
...  
Keyword(s):  
High Performance ◽  
Recent Advances ◽  
Semiconductor Nanomaterials ◽  
Low Dimensional

scholarly journals Perovskite Solar Cells: Low‐Dimensional Perovskites with Diammonium and Monoammonium Alternant Cations for High‐Performance Photovoltaics (Adv. Mater. 35/2019)

2019 ◽  
Vol 31 (35) ◽  
pp. 1970252 ◽  
Author(s):  
Pengwei Li ◽  
Chao Liang ◽  
Xiao‐Long Liu ◽  
Fengyu Li ◽  
Yiqiang Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Low Dimensional
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