A New Proportional - Pursuit Coupled Guidance Law with Actuator Delay Compensation

Year: 2012 Volume: 6 Issue: 5 1040 - 1047 Pages

• Authors:
• Chien-Chun Kung
• Feng-Lung Chiang
• Kuei-Yi Chen
• Hsien-Wen Wei
• Ming-Yi Huang
• Cai-Ming Huang
• Sheng-Kai Wang

Abstract: The aim of this paper is to present a new three-dimensional proportional-pursuit coupled (PP) guidance law to track highly maneuverable aircraft. Utilizing a 3-D polar coordinate frame, the PP guidance law is formed by collecting proportional navigation guidance in Z-R plane and pursuit guidance in X-Y plane. Feedback linearization control method to solve the guidance accelerations is used to implement PP guidance. In order to compensate the actuator time delay, the time delay compensated version of PP guidance law (CPP) was derived and proved the effectiveness of modifying the problem of high acceleration in the final phase of pursuit guidance and improving the weak robustness of proportional navigation. The simulation results for intercepting Max G turn situation show that the proposed proportional-pursuit coupled guidance law guidance law with actuator delay compensation (CPP) possesses satisfactory robustness and performance.

• Keywords:
• Feedback linearization control
• time delay
• guidance law
• robustness
• proportional navigation guidance
• pursuit guidance.

Design a Three-dimensional Pursuit Guidance Law with Feedback Linearization Method

Year: 2011 Volume: 5 Issue: 7 1372 - 1377 Pages

• Authors:
• Chien-Chun Kung
• Feng-Lung Chiang
• Kuei-Yi Chen

Abstract: In this paper, we will implement three-dimensional pursuit guidance law with feedback linearization control method and study the effects of parameters. First, we introduce guidance laws and equations of motion of a missile. Pursuit guidance law is our highlight. We apply feedback linearization control method to obtain the accelerations to implement pursuit guidance law. The solution makes warhead direction follow with line-of-sight. Final, the simulation results show that the exact solution derived in this paper is correct and some factors e.g. control gain, time delay, are important to implement pursuit guidance law.

• Keywords:
• Pursuit guidance law
• feedback linearization.

Effect of Sintering Temperature Curve in Wick Manufactured for Loop Heat Pipe

Year: 2012 Volume: 6 Issue: 2 421 - 426 Pages

• Authors:
• Shen-Chun Wu
• Chuo-Jeng Huang
• Wun-Hong Yang
• Jy-Cheng Chang
• Chien-Chun Kung

Abstract: This investigation examines the effect of the sintering temperature curve in manufactured nickel powder capillary structure (wick) for a loop heat pipe (LHP). The sintering temperature curve is composed of a region of increasing temperature; a region of constant temperature and a region of declining temperature. The most important region is that in which the temperature increases, as an index in the stage in which the temperature increases. The wick of nickel powder is manufactured in the stage of fixed sintering temperature and the time between the stage of constant temperature and the stage of falling temperature. When the slope of the curve in the region of increasing temperature is unity (equivalent to 10 °C/min), the structure of the wick is complete and the heat transfer performance is optimal. The result of experiment test demonstrates that the heat transfer performance is optimal at 320W; the minimal total thermal resistance is approximately 0.18°C/W, and the heat flux is 17W/cm2; the internal parameters of the wick are an effective pore radius of 3.1 μm, a permeability of 3.25×10-13m2 and a porosity of 71%.

• Keywords:
• Loop heat pipe (LHP)
• capillary structure (wick)
• sintered temperature curve.