Fast and High Precision Thermoelectric Potential – Temperature Conversion Method for Aerodynamic Heating Control Systems

2013 ◽  
Vol 694-697 ◽  
pp. 955-960
Author(s):  
Da Fang Wu ◽  
Shuang Wu ◽  
Yue Wu Wang ◽  
Zhen Tong Gao ◽  
Jia Ling Yang
Keyword(s):  
Control Systems ◽  
High Precision ◽  
High Speed ◽  
Dynamic Control ◽  
Potential Temperature ◽  
Temperature Fields ◽  
Aerodynamic Heating ◽  
Heating Process ◽  
Easy Calculation ◽  
Conversion Method

A fast and high-precision ‘thermoelectric potential - temperature (E-T)’ sensor conversion method for the transient aerodynamic heating control systems of high-speed aircraft is proposed. The developed method has the advantages of easy calculation, rapid conversion speed and high calibration precision, and can thus be employed for fast non-linear dynamic control of rapidly-changing temperature fields in the aerodynamic heating process of high-speed aircraft.

Rapid High-Precision Non-Linear Calibration for Temperature Sensors in Transient Aerodynamic Heating Simulation Systems

2013 ◽  
Vol 321-324 ◽  
pp. 618-623 ◽  
Author(s):  
Da Fang Wu ◽  
Shuang Wu ◽  
Yue Wu Wang ◽  
Zhen Tong Gao ◽  
Jia Ling Yang
Keyword(s):  
High Precision ◽  
High Speed ◽  
Dynamic Control ◽  
Potential Temperature ◽  
Temperature Fields ◽  
Aerodynamic Heating ◽  
Heating Process ◽  
Linear Calibration ◽  
Linear Dynamic ◽  
Non Linear

In order to accurately simulate the transient aerodynamic heating conditions experienced by aircraft when flying at high speeds, rapid and highly precise non-linear dynamic control of the heating process in aerodynamic simulation experiments must be conducted using a transient heat flux control system. This process involves carrying out ‘thermoelectric potential - temperature (E-T)’ conversion of sensors. Here a fast and high-precision ‘E-T’ sensor conversion method for the transient aerodynamic heating control systems of high-speed aircraft is proposed. The developed method has the advantages of easy calculation, rapid conversion speed and high calibration precision, and can thus be employed for fast non-linear dynamic control of rapidly-changing temperature fields in the aerodynamic heating process of high-speed aircraft.

Research on Control of Heat Flux Environment Simulation for High-Speed Aircraft

2013 ◽  
Vol 705 ◽  
pp. 528-533 ◽  
Author(s):  
Da Fang Wu ◽  
Yue Wu Wang ◽  
Shuang Wu ◽  
Jia Ling Yang ◽  
Zhen Tong Gao
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
High Speed ◽  
Control Method ◽  
Process Time ◽  
Aerodynamic Heating ◽  
Heating Process ◽  
Transient Heating ◽  
Highly Nonlinear ◽  
Aerodynamic Simulation

The characteristics of the transient heating control process of aerodynamic simulation experiments are complicated, transient, highly nonlinear, and strongly coupled, which make it difficult or impossible to develop a mathematical model. By using the fuzzy control method, many good qualities (such as robustness, high adaptability to changing parameters, and a short transition process time) can be obtained. Based on the fuzzy control method, a transient aerodynamic heating simulation control system for missiles was established. It was demonstrated that quick dynamic control of the aerodynamic simulation heating process according to the transient and continual change in heat flow on the surface of high-speed aircrafts can be completed by using this control system.

A High-Speed and High-Precision Compound Algorithm Combining PID with MRAC for a Flow Control System Based on the Lyapunov Approach

2011 ◽  
Vol 130-134 ◽  
pp. 3648-3653
Author(s):  
Liang Zhao ◽  
Bin Bin Wang ◽  
Fei Liang Xu
Keyword(s):  
Control Systems ◽  
High Precision ◽  
High Speed ◽  
Linear Time ◽  
Control Flow ◽  
Practical Application ◽  
Lyapunov Approach ◽  
Flow Control System ◽  
Model Reference Adaptive ◽  
Speed Response

For a class of non-linear,time-delay and time-varying control systems with unknown interference,a compound algorithm combining classical PID with model reference adaptive control (MRAC) based on the Lyapunov approach is proposed in this paper.The compound algorithm is employed to control flow in automobile radiator’s water circulation system.The simulation and practical application show that the compound algorithm could ensure high speed response,high precision,stabilization and rubustness more effectively compared with conventional control algorithm.The algorithm is practical and worthy to be used.

LED MODULE WITH ELECTRONIC ILLUMINATION CONTROL

2019 ◽  
Vol 1 (12) ◽  
pp. 146-154
Author(s):  
V. Lisovenko ◽  
D. Lisovenko ◽  
O. Bazyk
Keyword(s):  
High Precision ◽  
Single Point ◽  
Dynamic Control ◽  
Directional Pattern ◽  
Current Strength ◽  
Design Parameters ◽  
Light Sources ◽  
Computer Design ◽  
Light Power ◽  
Electron Dynamic

Many energy saving tasks can be solved thanks to the current advances in LED technology in the production of semiconductor light sources. Modern production of solid-state LEDs guarantees high-precision compliance with the calculated design parameters of illumination devices. This opens up wide opportunities for high-precision control of the lighting parameters of a multicomponent module: light power, a directional pattern and a distribution of illumination. Today, the methodical issues of the preliminary modeling of LED illumination devices with the given parameters are fundamentally solved. There is a shift from manual calculations to computer design and need to develop and select the most effective mathematical modeling methods. The paper presents a consistent approach to the modeling of the distribution of illumination on a horizontal plane from the planar LED module, based on the Lambert type of radiation of a single point source. Simple mathematical expressions, programmed on a personal computer, are obtained. The example of a 25-LED floodlight has shown the ability of dynamic control the lighting characteristics of the module. Connecting patterns of separate LEDs or their groups allow to change the direction pattern of the lamp by the appropriate way of switching diodes with different aperture of radiation. The lighting power can be controlled within the linearity of the ampere-brightness characteristics by changing the current strength through the LED. The static selection of characteristics is controlled by the geometry of the location of discrete sources. The formation of uniform illumination of the plane is graphically illustrated. The electron-dynamic way of controlling the lighting parameters of the LED floodlight is confirmed by the inventor’s certificate.

scholarly journals Variable step control to improve scanning speed of gene sequencing stage

2021 ◽  
pp. 002029402110022
Author(s):  
Xiaohua Zhou ◽  
Jianbin Zheng ◽  
Xiaoming Wang ◽  
Wenda Niu ◽  
Tongjian Guo
Keyword(s):  
Motion Control ◽  
High Precision ◽  
High Speed ◽  
Stable State ◽  
Gene Sequencing ◽  
Scanning Speed ◽  
Settling Time ◽  
Step Motion ◽  
Variable Step ◽  
Step Control

High-speed scanning is a huge challenge to the motion control of step-scanning gene sequencing stage. The stage should achieve high-precision position stability with minimal settling time for each step. The existing step-scanning scheme usually bases on fixed-step motion control, which has limited means to reduce the time cost of approaching the desired position and keeping high-precision position stability. In this work, we focus on shortening the settling time of stepping motion and propose a novel variable step control method to increase the scanning speed of gene sequencing stage. Specifically, the variable step control stabilizes the stage at any position in a steady-state interval rather than the desired position on each step, so that reduces the settling time. The resulting step-length error is compensated in the next acceleration and deceleration process of stepping to avoid the accumulation of errors. We explicitly described the working process of the step-scanning gene sequencer and designed the PID control structure used in the variable step control for the gene sequencing stage. The simulation was performed to check the performance and stability of the variable step control. Under the conditions of the variable step control where the IMA6000 gene sequencer prototype was evaluated extensively. The experimental results show that the real gene sequencer can step 1.54 mm in 50 ms period, and maintain a high-precision stable state less than 30 nm standard deviation in the following 10 ms period. The proposed method performs well on the gene sequencing stage.

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