Advanced Materials Research Vols. 816-817

Abstract: In this paper, a driving device with energy feedback for permanent magnetic mechanism is proposed. Firstly, the tripping circuit and the closing circuit are given and the formulas in tripping process and closing process are derived. By experiment, we get the waveforms and they are similar with the simulation waveforms. Finally, we can get the conclusion that the driving device and the function of energy feedback are practical.

Abstract: Currently the time to digital converter (TDC) integrated in FPGA performs time-to-digital conversion in the carry chain mode and inter-slot offset is caused to be severe by internal wiring in the FPGA. Based on the carry chain interpolation method, this paper proposes the method for using a delay module in FPGA to achieve accurate signal delay. By calculating the phase difference of multi-clock signal between two latch sampling points, the interval between two sampling points was obtained. Experimental results indicate a measurement accuracy of 78ps or 52ps can be reached by precisely collecting time through the delay module in FPGA. Compared to the carry chain interpolation method, this method is significantly advantageous in small inter-slot offset, stable performance and convenient design and can meet the requirement for time measurement or requirement by laser interferometer with a nm-level accuracy in nuclear physics.

Abstract: Aimed at the embedded analog integrated circuit chip, a research for the analog integrated circuit self-test is presented in this paper. As an embedded test system, one of the key factors is to minimize the resources occupation rate besides completing the test task. The principle of this study is to simplify the scale of the test circuit, in order to reduce the hardware cost of the analog integrated circuit performance test as much as possible. The idea is like this: sending the impulse signal as the excitation to the under test circuit and transforming its response signals into digital. Thus, it is convenient to test and analyses the circuit by digital means and make full use of the pulse-testing technology. Based on the above ideas, we design a structure of the analog integrated circuit self-test, and do some tests. The experiment results prove the correctness and feasibility of our design.

Abstract: In this research a feedback based under water system is introduced that can perform underwater task without human efforts. The system is named as Remotely Operated Under water Vehicle (ROV) & autonomous underwater vehicle (AUV). ROV can also provide a feedback to the base station about its current status such as its depth, direction, velocity, mine detection and targeting. The complete analysis has been implemented and by using MATLAB and AVR studio 4.

Abstract: Energy efficient character of daylight perceptive lighting was analyzed and a method to evaluate energy saving was present, according to the presentation the longer duration of indoor illumination being less than threshold is, the more energy is saved. With two sensors, a data fusion method was put forward to exclude interference and improve lighting comfort. With more than two sensors, data fusion based on neutral network was discussed.

Abstract: This paper mainly discusses the problem of wireless sensor network routing protocols. The flooding routing protocol has disadvantages of hidden terminal, information implosion and emerging redundant packet copies which consume more node energy. A sensor network routing protocol based on node residual energy (RPBEN) is proposed and evaluated. The new protocol choices a small number of nodes that have maximum remaining energy as next hop routing nodes. It saves the energy by avoiding redundancy packet copies produced and improve the disadvantages of flooding routing protocol. Performance analysis and simulation experiment show that the new protocol effectively reduces the data redundancy, reduces the energy consumption and prolongs the network lifetime.

Abstract: The objective of this paper is to provide tutorial treatment of the steps for analyzing poles and zeros in multi-stage amplifiers and low dropout (LDO) regulators. The steps can be easily all done by hand simplification without lacking for accuracy, and divided into two methods depending on whether Miller effect exists or not. A two-stage Simple Miller Compensation (SMC) amplifier and an output capacitor-less regulator are analyzed in detail, and several multi-stage amplifiers reported in the literature are also included. To this end, Cadence Spectre simulations are performed to compare hand-computed pole/zero locations with AC analysis.

Abstract: Owing to the given variables are measurable in online power flow calculation, the electrical variables of higher measuring accuracy should be chosen for calculation. Currently the theory of reactive power is deficient and several methods for reactive power measurement are briefly introduced in this paper. The inaccuracy of those methods is pointed out by the relevant references in non-sinusoidal conditions. The measuring accuracy of Active power directly obtained by voltage and current is the same as that of voltage and current. For increasing the accuracy of online power flow calculation, a method substituting voltage magnitude for reactive power is proposed in this paper. The new method eliminates the effects resulted from inaccurate reactive power measurement. The simulation results on software MATPOWER verify the correctness and rationality of the new method.

Abstract: The hazards of electromagnetic loop network in the power grid are briefly introduced. It pointed out that the quantitative analysis of source power distribution is useful to develop effective scheduling operation. In this paper, according to circuit theory, distribution of source power is analyzed in the electromagnetic loop network, and the power transfer functions from the sources to the loads are established, which reveals the power transfer rule. This method could not only help the schedulers deepen the understanding of the inherent laws of power flow changes, but also support to develop effective scheduling measures. Finally, a simple system is used to test this method.

Abstract: For nuclear power CNC wheel groove milling machine in the work under the influence of a variety of heat sources, establish the finite element model of machine, using finite element analysis software ANSYS, analysis and thermal-structure coupling of heat source in the processing state mechanism, thermal key points out machine, the effect of deformation on the machine geometric accuracy evaluation of heat, and the machine thermal optimization analysis of corresponding, deformation of machine in the three direction. The results show that: the machine in machining spindle heat is an important factor affecting the machining accuracy of machine tools, and heat through various ways to machine tool bed, causing warping, guide rail bending, through this analysis provides reference for analysis and optimization design for the machine tool thermal deformation.