Advanced Materials Research Vols. 1030-1032

Abstract: Seen as a cantilever beam with distributed mass system, the boring bar model and its state -space equation is built. On the basis of the dynamic model, a stability diagram of the boring system of the type of regenerative chatter is obtained. According to the stability diagram of the system, we get main analysis and comparison of the system stability near the fundamental frequency. In this paper, piezoelectric smart flutter suppression is carried out on a boring system with distributed mass, which improved the stability of the boring system

Abstract: At present, the detection of weak corrosion current is not perfect and automated, to solve the problem, this paper put forward and designed a kind of weak and wide-range corrosion current real-time detection circuit with functions of automatic switching range . By choosing low bias current and high precision operational amplifier, using I - V conversion technology transform the weak current into voltage, then do voltage signal acquisition, using the SD card module and electronic analog switch combined with single chip microcomputer to realize real-time and auto-switching detection of the corrosion current. This circuit has good real-time performance and accuracy, and can achieve the corrosion current value that was outputted by gas corrosion sensor well.

Abstract: This paper investigates the common causes of coal mine belt conveyor accidents, including splice breakage, longitudinal rip, deviation, etc. Then, main real time monitoring methods and techniques for these coal mine belt conveyor accidents are classified and their problems are analyzed and summarized. At last, an intelligent real time monitoring system for coal mine conveyor belt which is under development is presented.

Abstract: Aiming at the wasted serious program of the university classroom lighting energy, the project of the classroom lighting energy saving intelligence control system be put forword based on single chip microcomputer. The intelligence system is composed of the hardware and the software, taking single chip microcomputer as the main control core, using the light-to-frequency converter, the human body temperature and infrared sensor. The existence of human body be detected by the human body temperature and infrared sensor, the current frequency-field chip be judged by photoconductive resistance. The classroom lighting intensity and intelligence lighting control system be achieved. The system saves significant energy and works intelligently. This system had many advantages. For example, the physical volume is small, the system is conveniently controlled, the credibility is high, the appropriation is strong, and its price proportion is ideal, etc. The experiment proved that the system can satisfy the control command of the classroom’s light device, so it could largely reduce the consuming of energy resources.

Abstract: Based on semi-active interconnected air suspension system full vehicle dynamic model, Hierarchical control strategy is used to design LIAS control system to improve vehicle riding comfort.The upper layer is mode judgements layer ,and the lower layer is interconnection condition control and damping condition control layer.Interconnection condition control rules are carried out by taking vehicle speed, steering wheel angle and vehicle roll angle as input parameters.On base of the model,simulation results show that vehicle riding comfort increases by 29.2% and 3.37% through using mixed SH-ADD control than that of SH and ADD control individually,and vehicle roll angle reduces effectively under double-lane condition by using sport mode control rules.

Abstract: An engineering approach of path following control for the type of under-actuated AUV, such as REMUS, was proposed. The path following control was separated into 2 parts: heading guidance and heading control. The heading guidance was designed based on the cross-track error and line of sight guidance, and sideslip angle was proposed to compensate the disturbance of the ocean current. The turning criterion was proposed when the vehicle approach the waypoint. A PD control algorithm was presented to the heading control and its parameters variable with the speed. Simulation and field experiments data show that the vehicle follows the path accurately in the environment of current and different speed, and the vertical rudder keeps steady without large scope and high frequency oscillation which is fit for the long-time working AUV. Engineers can debug the parameters based on the experiment data efficiently for their explicit physical meaning.

Abstract: Wheel hub motor used in drive system of pure electric vehicle has become hot research and future development. Based on a four-wheel independent drive(4WID) electric vehicles with wheel hub motors, the paper has made the research on electronic differential steering control strategy by using Ackermann steering model conditions, and the experimental results have also been analyzed for the actual steering control effects under differential control strategy.

Abstract: In order to make the different angles of the viewers get the best visual effects, the paper proposed a lift tilt rotary landscape showcase which can show all kinds with multi-degree of freedom. Showcase uses the electric motor to drive and PLC applications in the system which can be programmed to control various types of mechanical components, to achieve the function of lifting and descending of 4 position, 8 position, and 12 position, horizontal lift and rotating in 360-degree. The test and operation results demonstrate that the showcase meets the specific functional demand of design.

Abstract: With the introduction and wide applications of laser guided AGV in the tobacco corporation, the logistics automation level is increased greatly. But with the introduction of flexible manufacturing system, the production line of the tobacco corporation become more complicate, the material requirement become more flexible, so that the driving stability has brought great challenges of AGV. In the system of more AGV compositing, there will been bought the conflict between multiple vehicles AGV. How can locate the position of each AGV instantly, and estimate and dispose the conflict during the running process in time, it has been the solve direction for team. This paper is researched based on the AGV’s system of KunChuan, bring forward a monitoring system of AGVS. The results shown that the actual trajectory is fully consistent with the planned through running, and achieving the prospective effect.

Abstract: The dynamic characteristic of smart valve positioner is nonlinear in its operational range, while the traditional five-step method or a single switch PID control algorithm could not meet a nonlinear model uncertain control system for high-speed, high-precision control. This paper presents a new control algorithm which five-step switching method with backward PWM and PID control method combines, it realize that the opening degree of the valve is fast and accurate positioning under conditions in nonlinear. The experimental result show that the control algorithm is better than the five-step control method and PID control algorithm, and the algorithm is simple, high reliability, speed control, and have certain adaptive and robustness, valve positioning accuracy to meet the control requirerments.