Advanced Materials Research Vol. 940

Abstract: In order to solve the problem of the routine signal measuring apparatus applied in a certain type of electronic equipment , a wireless signal testing system based on bluetooth technology and LabVIEW is proposed and designed. The hardware and software structure of the system is demonstrated. The key principle of data acquisition, wireless transmission, data processing and display are described. The wireless signal testing system is successfully applied with the advantage of high accuracy, real-time and portable.

Abstract: Feedforward PID control of the current loop and speed loop based on the three closed loop PID servo control system was introduced here to improve the intermittent rotary positioning performance of the pick-and-place system. Feedforward PID control [1] is better than traditional PID control on command signal tracking under high-speed positioning control, which has been proved by Simulink simulation.

Abstract: As unmanned ground vehicle is a nonlinear time-varying system, it is difficult to describe the accurate mathematical model. To solve this problem, a control algorithm of vehicle trajectory tracking based Human-Simulated Intelligent Control (HSIC) is proposed, and feature model set, control mode set and reasoning mode set are designed. Finally, this method and traditional preview follower PID algorithm are compared with each other in experimental way. The results show that such method has small dependence on the model with better control effect and overall stability.

Abstract: The torque stability and shutdown control of electric learner-driven vehicle (ELV) in the condition of motor load suddenly changing make the ELV has the same clutch handling characteristics with the traditional vehicle, and this makes the ELV popularization possible. A special control method is put forward in this article to achieve the consistency with the mechanical properties of engine. A multiparameter control model to identify the real condition of clutch handling by driver is builded with fuzzy control law. The torque stability and shutdown control of the motor with the load raising rapidly condition are approached by the adjusting of armature voltage with PWM control law. Keywords: Electric Learner-driven Vehicle;Torque Stability;Fuzzy Control

Abstract: The thermal analysis and simulation of on-chip temperature control technology in the micro-gyroscope is researched. According to the thermal dissipation mechanism, the thermal resistance model of on-chip temperature control technology is established. The equantions of the conduction thermal resistance and the radiation thermal resistance are deduced. According to the lumped parameter model, the transient thermal response of the proof mass is derived. Theoretical analysis indicates the temperatures of the micro-heater and the proof mass are respectively 136.79°C and 59.95°C in equilibrium conditions. The Ansys simulation model of on-chip temperature control gyroscope is constructed to optimize the transient thermal response and the temperature distribution in steady-state. The simulation results show that the maximum temperature of glass thin-film is about 137.2°C, the temperature of gyroscope structure is about 58.5°C and the temperature difference is within 1°C in the steady-state. In the transient response, the temperature of gyroscope structure can be stabilized in the 12.5s. The simulation results prove that the on-chip temperature technology of micro-gyroscope has an excellent temperature uniformity and rapid temperature response.

Abstract: The active vibration control of the flexible cantilever beam with PZT actuators was studied in this paper, and the principle and the method of the active vibration control were analyzed. First, using the balanced reduction method to reduce the model was carried out; the reduced model would be controlled. The placement of the piezoelectric actuators was utmost important, the optimization arrangement of the piezoelectric actuators was studied in this paper basing on the modal influential matrix of the piezoelectric actuators in order to make it to maximize its effectiveness to realize active control. Next step the LQG/LTR method is used to control the structure, then the LQR method was adopted to control the beam, and the two methods were compared. The results show that the LQG/LTR method to control the beam will realize effective control if only the treatment is adequate, when the acoustic noise and Interference were added to the system.

Abstract: This paper regard the self-propelled artillery control system as the research object, by using the adaptive control, data fusion and dual-mode modulation technology, construction of the hardware platform of the system is made, the fault diagnosis model and repair information management system is established, finally a corresponding test equipment is developed. the device has strong Integrity , good versatility, high stability, realize offline detection, parts of the joint debugging and commissioning and quality evaluation, the comprehensive fault diagnosis, repair decision-making and information management, greatly improve the force protection equipment repair capacity.

Abstract: According to the pharmacy filling technical requirements of controlled fire extinguishers of self-propelled artillery, a "time-controlled continuous filling" filling method was proposed, problem of the extinguishing agent mixed with the air filled with ice clogging pipes media is solved, and two extinguishing agent pressurized filling and optimal timing nitrided cast/cutting process control are implemented. After the trial, controllable fire extinguishers filled with equipment with comprehensive, secure, reliable, good stability, can greatly reduce the cost of equipment maintenance.

Abstract: A fluorescent markers based two-dimensional parallel detection technique of Micro-fluidic chip is studied. In a special designed fluid field of test sample, excite fluorescence of micro-spheres probe by pulse-laser and employ high sensitivity CCD to catch it. The entire information from micro-fluidic chip can be obtained via a computer post-processing of the caught signal of fluorescence. Analyzed the probe flow state and fluorescence signal intensity of detection program. Established the expressions of fluorescence signal intensity and the parameters of detection system. Validation experiments indicate that this detection method has the advantages of rapid, accurate and high sensitivity.

Abstract: Solar powered UAV has the characteristics of high aspect ratio, low structural surface density, high structural flexibility and low flutter speed. Different solar array mountings will affect the flutter characteristics of the structure. The mechanical properties of solar arrays packaged and unpackaged are measured in this paper and the solar powered UAV structural finite element model based on Patran/Nastran was also established in the paper. Two solar array mounting ways are researched: embedded solar arrays and patching solar arrays. To investigate the flutter characteristics under the two solar array mounting ways, the Doublet lattice method (DLM) aerodynamic model is used to model the unsteady aerodynamic loads. Finally, flutter speed of the structure was determined by using the P-K method and the analysis result indicate that patching solar arrays is more conductive to improve the flutter characteristics of the structure.