Applied Mechanics and Materials Vol. 610

Abstract: High-temperature flue gas in the factory has three features: high flow, strong corrosive and high temperature. It must be cooled to the rated temperature of different working conditions. There are nonlinear, time-varying issues and difficult to establish accurate mathematical model in the control of pump water quantity. We put PLC as the core to design the cooling control system which adjusts the pump water quantity by frequency changer based on fuzzy control theory.

Abstract: According to the principle and the structure of attitude module of modular spacecraft,a matlab/simulink model library for attitude control module was build to resolve the problem of flee-tly modeling.Then its validity was proved by a simulation example.The library was embedded into the platform of matlab/simulink,so it is easy to use and can be serially improved.The methed will be helpful for modular spacecraft’s design and simulation.

Abstract: In the environment of the high speed development of industrial production, how to optimize the manufacture process, improve efficiency of the industrial step according to the modern industrial technology, is a key problem about industrial development. The traditional model of mass production way already can not adapt to development needs .Because of this, embedded configuration technology just puts forward in the history background. The technology, with its mature and stable control effect, is widely used in the automatic production line. In this paper, the research background come from PLC automatic production lines' project in the National Electrical Automation Contest, simulating a quite complicated series of mixture, stirring steps about several kinds of materials which are used in industries. Practice proves that this system can ensure the product quality and needs to produce in large quantities and fulfill complex production requirement and raise production efficiency.

Abstract: Aimed at the electromagnetic formation flying (EMFF) ground testbed, an optimal linear quadric regulator (LQR) and sliding mode controller (SMC) are both proposed in this paper. Firstly, the highly nonlinear characteristics of the electromagnetic force and torque are analyzed. Then, the nonlinear dynamics equations are linearized, the controllability of the linearized system is analyzed, the optimal linear quadric regulator is then presented. Moreover, a sliding mode controller is also presented. Finally, the numerical simulation is carried out to compare LQR and SMC, and demonstrate the robustness of SMC. The results show that the SMC is more effective than LQR, which pave the way for electromagnetic formation flying ground simulation.

Abstract: To reduce labor intensity and production cost, improve labor productivity and product quality , we design the fruit picking robot. In this design, we use the hydraulic shear elevator which is drived by vertical fixed fork, supplemented by servo hydraulic cylinder to achieve the function of lifting work platform. Also we use the worm and worm wheel structure to adjust the steering arm. I pick the hydraulic push rod to drive slide rail. I also use slider-crank mechanism to drive manipulator to achieve the function of shearing.

Abstract: In order to intelligentize the LED lighting systems,this system adopts the Freescale series MC9S08AC16 as the controller, senses the light environment induced by the photoresistor and uses the SS-101 pyroelectric infrared sensors to sense the presence of people. In addition, it uses LM3404 chip to drive LED headlamp unit and by changing the duty cycle of PWM to achieve the switches and automatic adjustment of brightness of LED lights. Experiments show that the light source brightness provided by this system is stable and reliable and the combination of infrared sensing technology and PWM technology achieves the intelligence of LED lights. Moreover, it has high application value.

Abstract: This paper provides a new delay-dependent stabilization criterion for systems with two additive time-varying delays. The novel functional is constructed, a tighter upper bound of the derivative of the Lyapunov functional is obtained. These results have advantages over some existing ones in that the skillfully combination of the delay decomposition and reciprocally convex approach. Two examples are provided to demonstrate the less conservatism and effectiveness of the results in this paper.

Abstract: The continuing success of near space hypersonic aircraft flight test has become a real threat to China's space attack-defense system, In view of the problem that the single model cannot track such target effectively, an interacting multiple model (IMM) tracking algorithm based on modified cornering model (MCT) was proposed. First the characteristics of near space hypersonic target were analyzed, and then the target real-time angular velocity according to the target motion equation was estimated, finally the near space hypersonic target tracking through the IMM was carried out. The Monte Carlo simulation results show that the IMM tracking algorithm can effectively track near space hypersonic target, and the tracking accuracy and stability are superior to single model, it has certain practical significance.

Abstract: Logistic Park is a vital logistic infrastructure in modern logistics development, and traffic jam on roads inside the Park also raises concerns. During peak hours, key nodes and channels in the park are jammed due to excessive traffic flow, and vehicle transport in the park is severely restricted. Operation schedule mode of the logistics park determines operation mode of traffic, this paper analyzes operation mode of traffic starting with operation schedule mode, draws up rationality park management and traffic organization schemes to solve traffic jam in the park, and validates rationality and practicability of traffic organization schemes with computer simulation.

Abstract: For the large number of sampling points and high requirement of stabilization in ultrasonic testing,the dynamic performance of 5-dof manipulator was taken into consider: Firstly, the D-H notation and Newton-Euler were applied to set up the kinematic and dynamic equation for trajectory planning. Then the 4-3-4 polynomial which is continuous in displacement, velocity and acceleration, was used for continuous trajectory planning in joints space. Finally the trajectory based on time optimization with the constraint of velocity and acceleration including torque of actuator was validated.