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Wang H.,Shanghai University | Li Y.,Shanghai University | Fu J.,Shanghai University | Xu L.,Shanghai University | Bao W.,Shanghai Automation Instrumentation Co.
2013 25th Chinese Control and Decision Conference, CCDC 2013 | Year: 2013

In this paper, a wireless intelligent differential pressure sensor with high-precision and multi-function is designed which integrated intelligent sensing and Wireless Industrial Control Network (WICN) technology. MSP430 is used to calculate the linear correction and digital temperature compensation, and other intelligent functions in the sensor. To realize the network communication, A Dynamic Slot Assigned adaptive MAC protocol (DSA-MAC) is implemented by CC2530 SoC, which is integrated on the interface panel of the sensor. The data transmission test of the sensor nodes shows that this design has a higher data package transmission rate, and can fulfill the requirements of industry applications. © 2013 IEEE.

Wang H.,Shanghai University | Li L.,Shanghai University | Fu J.,Shanghai University | Bao W.,Shanghai Automation Instrumentation Co. | Wang T.,Shanghai University
2013 25th Chinese Control and Decision Conference, CCDC 2013 | Year: 2013

According to different data sampling rates which are needed in machinery condition monitoring systems, one dual-mode wireless sensor network structure is proposed in this paper. For the change status of machinery, the faster need high-rate intermittent data acquisition and the lower need low-rate continuous data acquisition, so the wireless sensor network are configured to run in the dual-model to satisfy the two type of data acquisitions. The design and implementation of two kind of nodes and the shared gateway, which transmitter real data to industrial ethernet, are introduced in detail, and the some experience result show the validity of the dual-mode networks. © 2013 IEEE.

Zheng X.,Shanghai University | Fu J.,Shanghai University | Wu Y.,Shanghai University | Bao W.,Shanghai Automation Instrumentation Co.
2013 25th Chinese Control and Decision Conference, CCDC 2013 | Year: 2013

This paper build a triaxial geomagnetic measurement system based on GMR sensors, then discussed non-orthogonal and zero drift error compensation of the three axis GMR sensor. Combine with the multi-coordinate system data fusion algorithms and inversion algorithms, we established a non-orthogonal error compensation model, then we calculated the compensation parameters by BP neural network algorithm. The compensation model achieved a good compensation effect, the non-orthogonal and zero drift error of the three-axis GMR sensor reduced to 0.8% from 7.86%. © 2013 IEEE.

Li F.,Shanghai University | Li F.,Henan Agricultural University | Fu J.,Shanghai University | Du D.,Shanghai University | Bao W.,Shanghai Automation Instrumentation Co.
Communications in Computer and Information Science | Year: 2014

In large scale wireless sensor and actuator network (WSAN), severe packet dropout and latency make challenges in designing centralized control scheme. Moreover, if system runs stably with little fluctuation of states, period sampling always leads to waste of energy and communication resources. To this end, adaptive distributed event-triggered collaborative control scheme is proposed. In this scheme, distributed event-triggered (DET) mechanism is replaced by adaptive DET mechanism with variable triggering threshold in order to reduce updates of controller law further. Based on local information, distributed collaborative control (DCC) is carried out and formulated as optimization problem. And an improved particle swarm optimization (PSO) with linearly decreasing inertia weight is used to make a good tradeoff between global and local search ability. Simulation shows that, comparing with DET scheme, while guaranteeing required closed-loop performance, ADET scheme needs fewer executions of control task. © Springer-Verlag Berlin Heidelberg 2014.

Chen J.,Shanghai University | Fu J.,Shanghai University | Bao W.,Shanghai Automation Instrumentation Co.
Communications in Computer and Information Science | Year: 2014

As wireless sensor networks are widely used in industry, the wireless monitoring system for sniffing data packets from wireless sensor networks has been realized. Many novel methods has been utilized to efficiently store data and provide reliable query and display functions in real-time listening, such as adjustment of storage structure and introduction of memory module. This paper designs and realizes a wireless monitoring and visualization system, which can accurately collect data from the communication among a variety of wireless terminal devices in real-time through changing original data storage structure, improving data query algorithms and optimizing data display algorithms. © Springer-Verlag Berlin Heidelberg 2014.

Lai Q.,Shanghai University | Fu J.,Shanghai University | Bao W.,Shanghai Automation Instrumentation Co.
Communications in Computer and Information Science | Year: 2014

In wireless sensor networks, gateway is a hub in data transmission between wireless nodes and Personal Computer (PC). Once the gateway fails, the entire network will paralyze. To ensure the stability of the network, a methodology for the design of redundant gateway based on improved Transmission Control Protocol (TCP) congestion algorithm is proposed in this paper. In this methodology, two gateways physically connected by Ethernet are logically divided into a primary one and a secondary one. Secondary gateway is the backup of the primary gateway. The paper gives an improve method of congestion algorithm, which is applied in this scheme. It can better satisfy the high demands of real-time communication in the embedded system when compares with the traditional TCP congestion algorithm. Experiment shows the effectiveness of improved TCP congestion algorithm, when the primary gateway fails. Secondary gateway can rapidly replace the primary gateway and it ensures a better reliability of the network. © Springer-Verlag Berlin Heidelberg 2014.

Zhong Y.,Shanghai JiaoTong University | Zhang J.-G.,Shanghai JiaoTong University | Wang D.-Z.,Shanghai JiaoTong University | Shi J.-Z.,Shanghai Automation Instrumentation Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2010

The Computational Fluid Dynamics (CFD) method is employed to simulate numerically the steady flow and transient flow under variable openings of the nuclear safety grade 2 single-seat pneumatic diaphragm control valve, which is a sleeve valve. The steady simulations under rated condition tells that there is a large amount of vortex in the valve seat necking and around the valve cone, which leads to a much greater flow impact on the head of the valve cone and uneven pressure distribution on spool face. More consideration should be taken on the characteristics of the valve cone accordingly, when designing a valve of this kind. Then the transient flow under 100% and 40% openings is simulated numerically on the basis of steady simulations. The pulsation of the pressure magnitude at the points with large vorticity, in the valve seat necking and around the valve cone, is monitored. The main pulsation frequencies differ from the low natural frequencies of the model, which means that it is safe from leading to structural resonance.

Zhan H.,Jilin University | Zhan H.,Shanghai Automation Instrumentation Co. | Zong S.,Jilin University | Han X.,Jilin University | Li C.,Jilin University
Advanced Materials Research | Year: 2012

In this paper, the design of a CMOS transceiver circuits for CAN bus based on 0.5μm n-well CMOS process is presented. It has the advantages of high speed, high driving capability and strong anti-interference capability. It is mainly made up of a receiver and a transmitter which includes the input stage circuit, the middle stage circuit, the slew rate control circuit and the output stage circuit. With five cascaded inverters, the middle stage circuit can provide a high driving current and a small delay. In the slew rate control circuit, due to a variable charge or discharge current source, the slew rate of output signal could be adjusted continuously by an external resistance R s. So it is very convenient for the chip to be applied in different modes and at different rates. The output stage circuit has the function of short-circuit protection, overvoltage and undervoltage protection. The receiver circuit is a hysteresis comparator introduced by a positive feedback to reduce the differential noise effectively, and it has a small temperature coefficient too. Hspice simulation results show that the transceiver meets the ISO-11898 standards and could operate at the rate of 1Mbit/s. © (2012) Trans Tech Publications, Switzerland.

Li H.,Shanghai University of Electric Power | Zhang H.,Shanghai University of Electric Power | Ma F.,Shanghai University of Electric Power | Bao W.,Shanghai Automation Instrumentation Co.
Conference Proceedings - 2014 International Conference on System Science and Engineering, ICSSE 2014 | Year: 2014

Due to the national subsidy policy and the demand of energy, photovoltaic power generation is growing at a rapid rate all over the world. When new PV installations connect to utility grid, some problems, such as reactive power compensation, voltage stability and power quality, are around the corner. This paper presents a grid-connected PV simulation system with D-STATCOM. By using Matlab/Simulink for modeling PV system, this paper shows I-V and P-V characteristics of PV array, and uses D-STATCOM as the grid-connected converter to realize power coordination, voltage stabilizing and power quality improvement. The basic control strategy is dual-close-loop control strategy. By decoupling active power and reactive power, inner loop control algorithm is used to trace active power and reactive power current separately. Meanwhile, outer loop regulates DC link voltage and grid-connected voltage. The simulation result shows that PV system with D-STATCOM can output active power stably, keep grid-connected voltage steady, and improve power quality of output voltage and current. © 2014 IEEE.

Li H.,Shanghai University of Electric Power | Li S.,Shanghai University of Electric Power | Zhang H.,Shanghai University of Electric Power | Bao W.,Shanghai Automation Instrumentation Co.
Proceedings - 2013 International Conference on Computer Sciences and Applications, CSA 2013 | Year: 2013

For voltage stability problems caused by grid-connected wind farms, a strategy of coordinated reactive power compensation is proposed in this paper. The strategy utilizes static synchronous compensator (STATCOM) and doubly-fed induction generator (DFIG) to stabilize the voltage of low voltage bus of wind farm. As the basic reactive power compensation unit, STATCOM works at constant voltage regulation mode and is always put into operation. When the reactive power output of STATCOM reaches its maximum value while the voltage of low voltage bus can not be stabilized still, the reactive power compensation of DFIGs which used as compensators will start together. The illustrative example shows that the proposed strategy can effectively restrain the fluctuation of bus voltage caused by wind speed and has a certain voltage support capability when system voltage drops. © 2013 IEEE.

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