Science and Technology on Aircraft Control Laboratory

Beijing, China

Science and Technology on Aircraft Control Laboratory

Beijing, China

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Dou H.,Beihang University | Wang S.,Science and Technology on Aircraft Control Laboratory
Proceedings of the 2011 6th IEEE Conference on Industrial Electronics and Applications, ICIEA 2011 | Year: 2011

This paper presents a control algorithm to address the leveling issue for lifting vehicle. The leveling system is achieved by electro-hydraulic system because of its advantages, such as small size-to-power ratios and so on. As four cylinders used to achieve synchronization, the issue of cylinder redundancy appears. In order to address this issue, the approach that two cylinders are only allowed to move in the same time is used. The two moving cylinders both are at the front of vehicle or at the back of vehicle. So the leveling issue is converted to motion synchronization of dual-cylinder. The design of controller to achieve motion synchronization of dual-cylinder is presented. The synchronization controller is a double loop controller. Inner-loop controller is a PID controller that is used to achieve the tracking performance of individual cylinder. Outer-loop controller is a compensation controller that is used to compensate the synchronization error of the cylinder the displacement of which is smaller. Simulation results on a dual-cylinder system verified the effectiveness of the proposed approach. © 2011 IEEE.


Liu W.,Beihang University | Liu W.,Science and Technology on Aircraft Control Laboratory | Liu W.,HIGH-TECH | Zheng Z.,Beihang University | And 2 more authors.
Knowledge-Based Systems | Year: 2013

This paper presents a novel real-time path planning approach for unmanned aerial vehicles (UAVs) based on bi-level programming (BLP), in which the planning problem is described as a leader-follower decision making model. The proposed approach can fulfill an integrated path planning requirement, including several realistic abilities of convergence to target, obstacle avoidance, path length optimization, flight path smoothing and adaptability to the changes of the UAV's kinematic and sensory properties. In the BLP model, opposition obstacles and UAV's interrelated performances are described to construct path searching constraints, and variable planning time intervals are introduced to generate navigable flight paths only when necessary. A discretization solution algorithm embedded with five heuristic optimization strategies is particularly designed to speed up the planning. Moreover, convergence and computational cost, as well as potential extensions, are discussed to expose the efficiency and applicability of the approach. Numerous simulations in stochastic and representative scenarios demonstrate not only the effectiveness of the approach in generating optimized flight paths for UAVs, but also its clear advantages through comparisons with four typical methods, while synthetically considering the crucial abilities. © 2013 Elsevier B.V. All rights reserved.


Li K.,Beihang University | Li K.,Civil Aviation Management Institute of China | Wang S.,Beihang University | Wang S.,Science and Technology on Aircraft Control Laboratory | Sullivan J.P.,Purdue University
Applied Thermal Engineering | Year: 2013

This paper proposes a novel thermal network to calculate the maximum temperature-rise of hollow cylinder geometry, which is named as the maximum thermal network. Linear transformation and local linear fitting are applied to make the maximum temperature-rise of hollow cylinder represent by the maximum thermal network. One compensation unit is added into the maximum thermal network for the elimination of the error introduced by linear fitting. Moreover, an iterative algorithm is presented in this paper, which is used in the calculation of the maximum temperature-rise for the system composed of more than one hollow cylinder. At the end of the paper, the thermal model of an electric motor is built by the maximum thermal network whose accuracy is verified by comparing with finite-element analysis. © 2012 Elsevier Ltd. All rights reserved.


Zheng Z.,Science and Technology on Aircraft Control Laboratory | Zheng Z.,Beihang University | Shumin L.,Beihang University | Ze G.,Beihang University | Yueni Z.,Beihang University
International Journal of Computational Intelligence Systems | Year: 2013

Resource-constraint multi-project scheduling is one of the most important topic in the field of project management. Most current works solve this problem based on an idea that multiple projects can be simply emerged into a super-project in a deterministic environment, regardless of the project priority and robustness of schedules. This paper discusses the RCMPSP with priority and formulates a discrete bi-objective decision model. A modified NSGA-II based algorithm is presented to solve the model. Furthermore, we design systematic experiments to investigate the interrelationship between robustness and its related project parameters, including order strength, resource constrainedness and uncertainty level. The results demonstrate the effectiveness of the solution algorithm and show that the three parameters indeed have evident impacts on the robustness and makespan of projects. © 2013 Copyright the authors.


Wang L.,Beihang University | Wang X.,Science and Technology on Aircraft Control Laboratory
Applied Mechanics and Materials | Year: 2013

Artificial muscle is a new style of actuator with novel working principle, which owns the advantages of compact structure, high power-to-weight ratio, compliance and easy application. Pneumatic artificial muscle (PAM) is usually used in robotics, medical auxiliaries and other small force output occasions nowadays. However, it suffers problems of small power, hysteresis and poor repeatability. A kind of artificial muscle working at high pressure was researched. Different muscle styles are compared and MicKibben structure is selected while fluid media is determined. Furthermore, factors of geometry and material properties, which limit the ultimate pressure, are analyzed. Formulas and simulations verify the influence of limitation and help to calculate key parameters of 18MPa artificial muscle. Data show that it is possible in theory to design high pressure artificial muscle by overall consideration of initial diameter, initial contraction angle and material properties, initial length only influent the stroke. © (2013) Trans Tech Publications, Switzerland.


Dou H.,Beihang University | Wang S.,Beihang University | Wang S.,Science and Technology on Aircraft Control Laboratory
Automatica | Year: 2014

A novel synchronization motion control method is proposed in this paper for the system in which two manipulators are constrained by a flexible beam. Different from the general synchronization control method, the coupling dynamics among various actuators is considered as the shear force, which results from the synchronization errors. Then a simple boundary control is introduced to realize the synchronization motion of actuators by suppressing the shear force. In order to avoid the drawbacks of assumed modes model, the dynamic model of flexible beam is described by a distributed parameter model in this paper. A Riesz basis method is used to prove that the proposed control law can guarantee the synchronization system to be exponential stability. Simulation results demonstrate that the proposed method can effectively improve the performance of synchronization motion compared with other methods. © 2014 Elsevier Ltd. All rights reserved.


Dou H.,Beihang University | Wang S.,Beihang University | Wang S.,Science and Technology on Aircraft Control Laboratory
Mechanism and Machine Theory | Year: 2013

High-performance robust adaptive synchronization motion control for multiple two-link manipulators with parametric uncertainties and uncertain nonlinearities is considered. The proposed control approach considers synchronization motion as constraint motion. The Lagrange multiplier method is used to derive the coupling dynamic characteristics caused by synchronization constraint conditions. In order to track desired trajectories while maintaining the synchronization motion, a motion/force control strategy is developed. Motion control is used to track desired trajectories for independent joints. Force control is used to realize the synchronization motion by guaranteeing the constraint force to be zero. In order to improve the performance of force control, a first-order low-pass filter is introduced. Simulation results demonstrate that the proposed method can effectively improve the performance of synchronization motion and tracking performance compared with other methods. © 2013 Elsevier Ltd. All rights reserved.


Zhang C.,Beihang University | Zhang C.,Science and Technology on Aircraft Control Laboratory | Wang S.,Beihang University | Wang S.,Science and Technology on Aircraft Control Laboratory
Proceedings of the 2011 6th IEEE Conference on Industrial Electronics and Applications, ICIEA 2011 | Year: 2011

Solid lubricated bearing is a key component in spacecrafts and various other applications. Its performance degradation assessment is very important due to the demand of high reliability of aeronautic products. In this paper, a new method consists of wavelet packet decomposition and improved fuzzy c-means is proposed. The vibration signal of tested bearings is decomposed and one node is used to reconstruct the original signal. Then the energy of the reconstructed signal is calculated and the subjection of the energy to normal state is used as performance degradation indicator. Improved fuzzy c-means is used to calculate the subjection matrix. After the test, several tested bearings are observed with an scanning electron microscope. © 2011 IEEE.


Di X.,Harbin Institute of Technology | Di X.,Science and Technology on Aircraft Control Laboratory | Yang Y.,Harbin Institute of Technology
Proceedings of the 2013 IEEE 8th Conference on Industrial Electronics and Applications, ICIEA 2013 | Year: 2013

The energy consumption of near-space airship during the ascending phase has an direct effect on its payload capability. Because of that, it is necessary to research on trajectory optimization of airship. At first, the models of various wind interference are given from the ground to the stratosphere and the trajectory optimization scheme of airship based on numerical method is proposed. Secondly, direct collocation method will be used to convert the optimal control problem into a parameter optimization problem, then Genetic Algorithm(GA) will be used to solve the nonlinear programming. Thirdly, the ascending trajectory is divided into three phases according to the altitude and wind interference. Finally, the simulation results of the trajectory optimization from ground to the appointed position under the consideration of wind interference will be shown. © 2013 IEEE.


Yifei Z.,Science and Technology on Aircraft Control Laboratory | Zongxia J.,Science and Technology on Aircraft Control Laboratory | Shuai W.,Science and Technology on Aircraft Control Laboratory
Proceedings of 2015 International Conference on Fluid Power and Mechatronics, FPM 2015 | Year: 2015

The traditional control strategy of hydraulic flight motion simulator (HFMS) cannot meet the high tracking performance requirement, and the control precision is sensitive to disturbance. This paper presents an adaptive inverse controller based on the Wiener-type recurrent neural network (WRNN) to deal with the parametric uncertainties and uncertain nonlinearities in HFMS. The WRNN is a dynamic linear subsystem cascaded with a static nonlinear subsystem. The controller contains two WRNNs, one to identify the Jacobian information of the controlled plant and another to approximate the inverse model of the plant. Since the inverse transfer function behaves sensitive to the initial value, a feedback controller is designed. The input of the controlled plant includes the feedback controller output and the WRNN inverse controller output. Simulations have confirmed the effectiveness and superiority of the proposed WRNN adaptive inverse control strategy. © 2015 IEEE.

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