Time filter

Source Type

Sun J.-Q.,Shanghai JiaoTong University | Sun J.-Q.,First Engineers Scientific Research Institute | Wang D.-Y.,Shanghai JiaoTong University | Sun Y.-G.,Shanghai JiaoTong University | And 2 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2015

Unlike other ocean structures, the Very Large Floating Structures(VLFS) would have large deformation under waves because of the enormous size. Hydroelasticity theory has been developed to study the response of VLFS. To increase the computational efficiency, a multi-segment beam model is proposed here to study a VLFS, which is a multi-module connected by hinge connectors. The response characteristics were studied in this paper, including the effects of wave length, wave frequency and connector's stiffness. It can be concluded from the results that, under long waves, rigid body motion is dominant, but elastic deformation dominates under short waves. The hudroelastic response is sensitive to the wave heading but biggest elastic deformation always happened when the projection of the length of the VLFS on wave heading direction is close to the wave length. Elastic deformation is sensitive to the stiffness of the connectors. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).


Zhang Z.,Shanghai JiaoTong University | Li Z.,Shanghai JiaoTong University | Chen J.,Shanghai JiaoTong University | Hu S.,First Engineers Scientific Research Institute | Wang W.,First Engineers Scientific Research Institute
International Journal of Ad Hoc and Ubiquitous Computing | Year: 2016

In this paper, we propose an energy-efficient and low-delay scheduling (EELDS) scheme for interruptible preamble sampling-based medium access control (MAC) protocols (e.g., BoX-MAC-2 and X-MAC) in IEEE 802.15.4 wireless sensor network (WSN), which considers energy efficiency while reducing delay and contention in the context of real-time data gathering and remote monitoring applications. It is built on MAC layer and exploits local information to coordinate the MAC schedules of nodes in a slowly-changing topology, just with light overhead. The scheme also considers the adaptation to data aggregation with real-time data flows. Therefore, our scheme allows for much longer network lifetime while satisfying the delay constraints. The implementation and simulation results show the performance of the proposed scheme. © 2016 Inderscience Enterprises Ltd.


Qian H.,First Engineers Scientific Research Institute | Sun P.,First Engineers Scientific Research Institute | Zhao H.,Air force Radar Academy
Advanced Materials Research | Year: 2012

Modern warfare has led the concept of remotely operated weapon station for increasing force protection while maintaining lethality. There is a need for an efficient embedded control system for certain kind of system. A design proposal of an integrated PC-architecture embedded control system for remotely operated weapon station is presented. The hardware of the system is based on the 486DX2 processor running at 100MHz with coprocessor, which is a Pentium class platform. Hardware/software co-design methods and tools have been discussed after the system configuration is decided. The software design consideration for the control system has been presented according to multi-task programming of VxWorks. © (2012) Trans Tech Publications, Switzerland.


Sun P.,First Engineers Scientific Research Institute | Qian H.,First Engineers Scientific Research Institute | Zhao H.,Air force Radar Academy
Proceedings - 2012 International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2012 | Year: 2012

An inertial navigation system with high anti-g capability, low power consumption, small volume and low cost is needed on certain specific tactical occasions. The gyroscope-free inertial measurement unit (GF-IMU) uses the linear accelerometers at different positions in space to calculate the angular velocity and estimate the navigation parameters. With the development of the MEMS sensors and Digital Signal Processors (DSP), a low-cost medium-precision tactical inertial measurement system can be developed. A SDRE-based filter algorithm is presented for dealing with the measurement error diverges of the linear accelerometers. A preliminary overall scheme is described, and the configuration profile of the sensors and the system equations are derived and analyzed. © 2012 IEEE.


Sun P.,First Engineers Scientific Research Institute
2nd International Conference on Information Engineering and Computer Science - Proceedings, ICIECS 2010 | Year: 2010

The dynamics of a small solid launch vehicle has been investigated. This launcher consists of a liquid upper stage and three fundamental solid rocket boosters aligned in series. During the ascent flight phase, lateral jets and grid fins are adopted by the flight control system to stable the attitude of the launcher. The launcher is a slender and aerodynamically unstable vehicle with sloshing tanks. A complete set of six-degrees-of-freedom dynamic models of the launcher, incorporation its rigid body, aerodynamics, gravity, sloshing, mass change, actuator, and elastic body, is developed. Dynamic analysis results of the structural modes and the bifurcation locus are calculated on the basis of the presented models. This complete set of dynamic models can further be used in flight control system design. ©2010 IEEE.


Li H.,First Engineers Scientific Research Institute | Sheng D.,First Engineers Scientific Research Institute | Wang B.,First Engineers Scientific Research Institute | Zhong X.,First Engineers Scientific Research Institute
2015 IEEE 12th International Conference on Electronic Measurement and Instruments, ICEMI 2015 | Year: 2016

Using wireless sensor network to carry out status monitoring for floating bridge structure will improve the reliability and effectiveness of monitoring system greatly. To solve power supply problem of the network nodes, this paper designs a kind of self-sustaining piezoelectric power supply. It converts the mechanical energy which produced in the floating bridge's work environment into vibration excitation source, so as to extend the load's continuous effect and correspondingly extend the power supply time; Applly ANSYS to carry out dynamic power generation characteristics simulation analysis of self-sustaining piezoelectric structure, make qualitative analysis on the effect principle of the relevant parameters on the power generation characteristics. Then built Maxite hammer machine test system to simulate the impact test. The research results show that the new power supply is able to collect the impact energy efficiently, and improve the electromechanical conversion efficiency greatly. © 2015 IEEE.


Li H.,First Engineers Scientific Research Institute | Sheng D.,First Engineers Scientific Research Institute | Biao W.,First Engineers Scientific Research Institute | Bing H.,First Engineers Scientific Research Institute
2015 IEEE 12th International Conference on Electronic Measurement and Instruments, ICEMI 2015 | Year: 2016

To solve generator problem of the sensor nodes for floating bridge monitoring system, design a kind of self-sustaining circular sheet piezoelectric generator. Its most important feature is the use of a self-sustaining circular sheet piezoelectric structure, it converts the mechanical energy into vibration excitation source, so as to extend the load's continuous effect and correspondingly extend the generator time; Describe its operating principles, the output electricity energy increases when piezoelectric circular sheet becomes resonance. In order to test and analyze the electrical generation performance of self-sustaining piezoelectric generator, built the measuring platform based on vibration exciter to simulate vibration test, in the design of this measuring platform, displacement sensor is used to measure the amplitude of piezoelectric circular sheet, charge amplifier is used to measure the electricity quantity generated by piezoelectric circular sheet, and the test result shows that increase the exciter load and work under the natural working frequency of piezoelectric circular sheet will increase the generating capacity of self-sustaining circular sheet piezoelectric generator. © 2015 IEEE.


Li H.,First Engineers Scientific Research Institute | Shi X.,First Engineers Scientific Research Institute | Lin K.,First Engineers Scientific Research Institute | Yu H.,First Engineers Scientific Research Institute
2016 IEEE/ACIS 17th International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing, SNPD 2016 | Year: 2016

The problems come from ESD become more and more serious. To evaluate the capability of ESD protection of materials entirely, design a multi-function electrostatic charge decay intelligent test instrument based on single chip compute. It adopts a new kind of efficient electrostatic decay time test scheme, so as to satisfy test condition that different materials have the same initial and terminal potential, and make test results not influenced by Cross-Over effect. Then introduce the system composition and operating principle of intelligent test instrument, and describe the specific software design method from man-machine interaction function, electrostatic potential measurement function and decay time calculation function, finally perform charging method test research with designed intelligent test instrument and analyze the test results. © 2016 IEEE.


Sun P.,First Engineers Scientific Research Institute | Wang W.,First Engineers Scientific Research Institute
Proceedings - 3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011 | Year: 2011

For the severe nonlinearity and time-varied problems of controlled object existed in mine sweeping plough electro-hydraulic servo system of a weapon, this paper presents a discrete-time sliding mode control technique using fast output sampling. Fast output sampling enables arbitrary sliding mode design and an equivalent fast output feedback control. In practice the system states needed in the sliding mode method are sometimes difficult to obtain. FOS method, which makes use of only the output samples, is combined with sliding mode method to accommodate the incomplete system state information. Thus, the control approach is more practical and easy to implement. The method and its stabilization are examined under numerical simulations and the results show that the proposed method produces excellent results and multimodel robust stabilization is achieved. © 2011 IEEE.


Qian H.,First Engineers Scientific Research Institute | Sun P.,First Engineers Scientific Research Institute | Rong Y.,First Engineers Scientific Research Institute
Energy Procedia | Year: 2011

A growing demand for deployment of autonomous battlefield sensors and sensor networks is leading to a subsequent increase in the demand for localized, independent energy harvesting capabilities for each node. In this paper, several methods of energy harvesting are summarized. By utilizing energy form the surroundings, small amounts of power can be harvested from wind, solar radiation and stress sources. Energy harvested is converted to battery potential via a converter. Operation flowchart of the system is presented. Meanwhile, an algorithm for the sensor network to adaptively learn its energy environment has been studied. Schemes summarized in this paper can be of guidance for design and utilize energy harvest systems on the battlefield network sensor nodes. © 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of International Materials Science Society.

Loading First Engineers Scientific Research Institute collaborators
Loading First Engineers Scientific Research Institute collaborators