Applied Mechanics and Materials Vols. 130-134

Abstract: This paper presents a new application scheme of Broadband Power Line Communication (BPLC) in smart home. In this scheme the power line was chosen as “the last one meter connection”medium in order to reduce the length of the PLC link and improve the network property. In the newscheme, the power lines and PLC modem were used to construct the indoor Ethernet, and the home appliances were connected to this indoor LAN through the serial port/Ethernet network adapter as an Ethernet unit, then to access or control the home appliancesfrom the Internet through the home gateway, which is different from the common ones, is available. The new application scheme not only increases the management efficiency and reduce the cost of smart home, but also conquer the shortcomings of the traditional methods.

Abstract: This paper proposes an improved particle swarm optimization algorithm (PSO) for the global and local equilibrium problem of searching ability. It improves the iterative way of inertia weight in PSO, using non-linear decreasing algorithm to balance, then PSO combines with simulated annealing (SA). Finally, the optimization test experiments are carried out for the typical functions with the algorithm (ULWPSO-SA), and compare with the basic PSO algorithm. Simulation experiments show that local search ability of algorithm, convergence speed, stability and accuracy have been significantly improved. In addition, the novel algorithm is used in the parameter optimization of support vector machines (ULWPSOSA-SVM), and the experimental results indicate that it gets a better classification performance compared with SVM and PSO-SVM.

Abstract: It needs to track the maximum power point for enhancing the output power of the photovoltaic power generation systems. Perturbation and observation (P&O) method is one of the control algorithms to realize maximum power tracking, which has extremely wide range of application because its tracking method is simple, the control circuit is easy to digitize and it is not strict to the accuracy requirement of sensor, etc. Comparing with traditional constant-step perturbation and observation method, which has disadvantages of power oscillation and slow tracking speed, this paper presents an improved method. The system is established in Matlab/Simulink, and the simulation results show that this method can track the maximum power point of the photovoltaic array quickly and accurately and the power oscillation is feeble.

Abstract: This paper introduces the design of a heating boiler control system based on PLC and IFIX. In this system, combining Premium PLC with IFIX4.5, industry Ethernet TCP/IP protocol communication is adopted to constructer the monitoring system of heating boiler though PLC and PC. Unity4.0 is used to design the ladder diagrams for the coal burning boiler to automatically realize burning process control and hearth pressure adjustment. IFIX4.5 is adopted to develop supervision control programs, which have perfect function, handy operation, fine visualization and strong man-machine interface.

Abstract: In this paper, a specific application accelerated iterative method is presented for calculating wave length in harbor engineering, which includes calculation method of wave length and specific implement in Excel. Different wavelengths into the iteration formula to calculate the same result can be obtained, but the calculation speed of different methods have significant differences to arrive at the fastest method . Calculated by accelerating the iteration method can significantly increase the computing speed and calculation steps. After the derivation of several methods and calculations show that Newton iteration is the fastest way to convergence speed, in the practical range of about 10 steps through the iterative convergence results can be obtained.

Abstract: In allusion to 300 Reversible cold mill, the composing and the theory of the auto gauge control system is presented. To meet the characteristic of the 300 reversible cold mill, the PID algorithm With Variable Integral Action is used in position and pressure inner loop control of press down hydraulic cylinder to elevate the response characteristic, and the dynamic press compensating algorithm is used in the gauge control outer loop to elevate the precision of strip thickness, and the stability of rolling process. Fig.1. 300 cold roling mill1 Introduction

Abstract: According to the control characteristics of brushless DC motor, a control system based on the LPC1700 ARM is designed, together with the corresponding external circuit. This system fully utilizes the high-performance 32-bit calculation of ARM chips and abundant hardware resources. It is compact in structure, reliable in operation and superior in speed regulation performance.

Abstract: This Paper describes a new modeling approach of rodless cylinder for pneumatic servo positioning systems and the identification of related parameters. A novel effective area function of the valve orifice is presented to produce a more accurate solution in valve modeling, which takes the offsets of the medium voltage into account. Besides, in the modeling of the cylinder’s friction, we take the stribeck effect into account. The results of simulation and the facts of experiments show the nonlinear model can reflect the characteristics of the servo pneumatic position system much better than former researches.

Abstract: The elevator control system is an important component of the modular elevator control system. The control and profile and PWM-pulse pattern generation are done by a microprocessor system. Position recognition, security and motor/inverter protection functions are implemented. Furthermore the microprocessor system has to establish the communication via the serial link (Multidrop protocol) with the motion command subsystem, from where it gets the door commands.

Abstract: The brake release electrical control board is a very important element of the elevator rescue operation control system. The brake release board provides a power supply to operate an elevator brake by a battery in rescue operation mode to allow a motion of a car until the next floor level to release any passengers. The brake release board has some buttons to operate the car and some LED’s to indicate the state of running. There are also some parameters in the board to adjust the operation.