Applied Mechanics and Materials Vol. 464

Abstract: Stabilization at the top vertical position of an inverted pendulum on a cart, while bringing the cart to a desired position, by applying a force to the cart is considered. This is an underactuated mechanical system for which the main nonlinear control scheme, feedback linearization, fails. A single control law producing the force on the cart using cart velocity, and position and velocity of the pendulum is developed and shown, by numerical experiments, to asymptotically stabilize the pendulum at the top position while bringing the cart to its origin, although no attemp is made for a proof of global stability.

Abstract: Exciting the mechanical resonance mode and vibration caused by non-smooth trajectories can cause some failure in the structure of the robot and its actuators. This work proposes a smooth trajectory planning for 3 degree of freedom (dof) 3-upu parallel manipulator. We have used optimization method to define the smooth trajectory for this robot. In this paper an objective function has been used which contain a term related to the total execution time and a term corresponding to the integral of squared jerk. Some constraints have been applied to the problem as the input of our system. Task space and joint space trajectory are then considered as the output. In this method optimization techniques such as genetic algorithm and fmincon (function of MatLab^TM ) have been investigated. Six via points have been considered and B-splines have been used to present kinematic quantities.

Abstract: Gimbals position locked is one of the key issues must be addressed in the platform motor control systems. The paper presents a shaft angle measurement system, control loop based on PWM technologies and simulation model for controller. This system has been implemented on a four-gimbal platform. The experimental evaluation indicate that its steady state error is less than 0.2 degree, settling time is less than 2 seconds and static torque stiffness exceed 3000gcm/rad.

Abstract: This paper analyzes the technical requirements for traction cutting in aluminum profile production, established a double tractor motion model, and according to the model, designed a traction control system based on ARM and wireless communication technology, designed the hardware circuit, write the corresponding control program and defined the protocol for wireless communication, so that the system has good compatibility, the system is fully implemented dual tractor motion model, the whole system has been tested in an aluminum profile factory, the experiment proved that the system is fully meet the requirements of the factory. And the system has the following advantages: inexpensive, simple structure, stable performance and good application prospect.

Abstract: Aiming at the need of borehole and ruins exploration in the nearly dark environment, a Panoramic Image System is proposed in this paper. consisting of a reciprocating motor, a steering gear with complete rotation, a miniature camera, a depth transducer and radio frequency wireless module. The camera was pushed to the specified location of the pipe by the motor and then the steering gear was rotated for panorama image acquisition. In order to achieve a seamless panoramic image without distortion, a fusion algorithm based on Principal Component Analysis (PCA) and an image mosaic algorithm for image edge extracting based on Canny operator were proposed. The imaging system has good usability and applicability.

Abstract: The Direct Drive Volume Control (DDVC) Electro-hydraulic Servo System is a new Electro-hydraulic Servo System. It has the advantages of flexibility of AC servo motor control and high power of hydraulic servo system. Compared with the traditional electro-hydraulic servo system, the DDVC system is efficient, miniaturized integrated, convenient operated and economical. It has been used in many domains, and made great economic benefits. So it is widely considered to be one of the most important developing directions of the hydraulic control system. It will be widely used in more and more areas in the future. With the development of its application, how to improve the trajectory tracking precision of the DDVC system in low velocity motions becomes more important in the field. So that, the level of the low velocity characteristic impacted the system become to an important subject. In this paper, the mathematical mode of AC asynchronism motor Direct Torque Control was established, and the simulation mode was built. In addition, the idealized model of the DDVC system which based on united simulation of AMEsim/Simulink was established, simulation was executed. In order to make the research available, the low velocity characteristic of the DDVC system was also analyzed, and the low velocity characteristic simulation model was built. Computer simulation validated that the friction, the leakage and the mechanical losses are seriously influenced the system performance when the system working on the low velocity mode.

Abstract: This paper introduces the research work on the development of a Smart Skin Antenna Structure (SSAS) for Global Navigation Satellite System (GNSS) by embedding a navigation antenna with working frequency from 1.2GHz to 1.6GHz into a composite sandwich structure. The structure possesses the load-bearing, shape maintaining and navigation capabilities at the same time. Numerical models have been generated to design and evaluate the EM property of this multifunctional structure. Specimens have been manufactured and tested. The test data show relatively good correlation to the numerical results.

Abstract: This paper which discusses the implementation issues of automatic control simulation experiment system that based on Visual C++ and Matlab interface, analyzes different implementation ways and characteristics of Visual C++ and Matlab interface, and studies the design of system software, points out the problems encountered under the process of the development.

Abstract: Based on user centered design method, Object Oriented technology and unified modeling language, the design process which is specified for computer aided aircraft maintenance training and evaluation system was proposed. According to this process, the user role model of aircraft maintenance training and evaluation system was established; the role-oriented multi-user access control method was studied; the construction technology of three-dimensional aircraft maintenance model resource database based on homebred 3D platform, the fuzzy evaluation techniques of students and training coursed were researched. This paper supplies a new way for aircraft maintenance training, which is meaningful for the informationization of aircraft maintenance service, to improve of the training efficiency and training effect of aircraft maintenance personnel and to promote domestic CAD technology development.

Abstract: Using the definitions of potential functions and ordinal potential functions of strategic form games, we characterize two classes of potential games and give the solving method of the equilibria of finite potential games by testing and verifying potential games. The main contribution is proving that public goods games and social coordination games based on location strategic interaction with an exogenous network are potential games, and giving the equilibria by the method of solving potential games and ordinal potential games.