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压阻式高量程加速度传感器和有限元分析的结构设计
On the basis of the acceleration measurement of high impact,a high-g acceleration sensors of the piezoresistive beam-island structure at four-terminal all fixed supported was designed.Its structure was analyzed.The reasonable structure parameters were chose.And the parameter simulation and modal analysis were completed with ANSYS software.The results show that the sensor can resist 200,000 g overload and meet high impact test requirements.
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基于多传感器数据融合的设备故障诊断方法研究
In this papcr,wc prcscnted an cquipmcnt fault diagnosis method based on multi-sensor data fusion,in order to solve the problems such as uncertainty,imprecision and low reliability caused by using a single sensor to diagnose the equipment faults.We used a variety of sensors to collect the data for diagnosed objects and fused the data by using D-S evidence theory,according to the change of confidence and uncertainty,diagnosed whether the faults happened.Experimental results show that,the D-S evidence theory algorithm can reduce the uncertainty of the results of fault diagnosis,improved diagnostic accuracy and reliability,and compared with the fault diagnosis using a single sensor,this method has a better effect.
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一个数字多通道磁通门信号处理系统的设计与实现
Addressing drawbacks of analog components and questions of multi-channel fluxgate signal operation,a FPGA (Field Programmable Gate Array) based signal processing system is designed.Three copies of sub modules compose the whole system,each of which exclusively processes one of three outputs of the fluxgate sensor.A "Phase-Sensitive-Rectification & Low-Pass-Filtering" circuit structure is employed in the processing module,through which the fluxgate signal harmonics are extracted and converted into direct quantities according to detected magnetic intensities.Firstly designed in HDL (Hardware Description Language),afterward configurated in a FPGA chip,finally tested by processing outputs of a fluxgate sensor probe in real-time,the functionality of the designed system is verified.With inherent advantages,this FPGA based design is much reliable over temperature; by processing signals not time-sharingly but synchronously,its working speed is excellently high.
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通过压电式传感器的个人运动测量系统
Originated from the need in the training of sports universities,a new personal motion-measurement system via piezoelectric sensor is presented to detect step number,stride frequency,and energy consumption in motion.The motion-measurement system in training should be not only accurate in detection,but also convenient for athletes.The novel system consists of detection unit,RF-wireless unit,and display unit.Using a high-sensitive piezoelectric sensor placed within the ball or lateral side of a personal shoe,the accuracy is improved greatly.With RF-wireless,the system achieves the goal in convenience.In the display unit,detected step number,stride frequency,and energy consumption are used to evaluate the quantity of motion,so the athletics can adjust their gait immediately.Compared with existing systems,the personal motion-measurement system via piezoelectric sensor improves greatly in accuracy and convenience.
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虚拟传感器网络中未来互联网应用的QoS管理
The integration of Wireless Sensor Networks (WSNs) in the Future Internet has opened new opportunities for novel applications that meet the needs of modern societies. Virtualisation of the available resources and the services offered by WSNs enables their efficient sharing between diverse applications reducing costs. Responding to this challenge, the VITRO project has designed a WSN virtualization architecture that targets to decouple the physical sensor infrastructure from the applications running on top of it. In the concept of Virtual Sensor Network platform, the WSNs are capable of collaborating among each other (even if they belong to different administrator domains or comprise of heterogeneous platforms) to flexibly support service composition and fuel novel application development. To meet the diverse Quality of Service (QoS) requirements imposed by the different applications running on top of the same infrastructure, VITRO has designed, implemented and integrated a routing solution that enables the establishment of different routing paths per application, based on different routing criteria in order to optimize the performance aspect(s) of interest to each application. In this paper, we demonstrate how the VITRO routing solution could be employed in various use cases including smart homes/buildings, smart cities, smart business environments and security-related applications. We evaluate the achieved performance using computer simulation results and provide guidelines for prospective users.
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使用RGB-D传感器的便携浸入式手术培训系统
Surgical training plays an important role in assisting residents to develop critical skills. Providing effective surgical training, however, remains as a challenging task. Existing videotaped training instructions can only show imagery from a fixed viewpoint that lacks both depth perception and interactivity. We present a new portable immersive surgical training system that is capable of acquiring and displaying high fidelity 3D reconstructions of actual surgical procedures. Our solution utilizes a set of Microsoft Kinect sensors to simultaneously recover the participants, the surgical environment, and the surgical scene itself. We then develop a space-time navigator to allow the trainees to witness and explore a prior procedure as if they were there. Preliminary feedback from residents shows that our system is much more effective than conventional videotaped system.
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基于星敏感器的捷联惯性导航系统的陀螺仪仿真
In inertial navigation system,gyro is used to measure the angular velocity of carrier relative to inertial space for achieve attitude matrix updated in real time.Gyro difficult to eliminate the error,results in strapdown inertial navigation system precision decrease with time.Star sensor is a high-precision attitude measuring instrument and don't require any priori information,the attitude date can be provided by star sensor.Thus,gyro is simulated by star sensor in order to improve the precision of strapdown inertial navigation system.
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用于无线传感器网络的HFE方案的可行性检测
In this paper, the energy consumption of Hidden field equation (HFE) multivariate scheme in wireless sensor networks (WSN) has been evaluated. Security provisioning in WSN requires balancing between two conflicting goals - security strength and resource efficiency. Most of the cryptosystems with security strength required in a WSN are highly resource intensive. Cryptographic operations consume processor power, time and memory space for storage of intermediate and final output. The cryptographic bits also constitute communication overhead that induces delay and decreases the effective throughput. To lessen the load on the resource constrained WSN without compromising security, HFE multivariate scheme is proposed. HFE is a multivariate cryptosystems in which linear equations are solved to obtain successive sets of central variables. The small number of operations and limited memory requirements make this scheme a potential candidate for security provisioning in WSN. Analysis and simulation results show that the scheme can be implemented on resource constrained sensor nodes. Moreover, the decrease in throughput and increase in delay due to HFE scheme are within the tolerable limits of WSN applications.
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适用于数字化变电站的电子式电压互感器的设计
In this paper an electronic voltage-current voltage transformer (EVCVT) scheme has been proposed based on voltage-current transformation,using the voltage-current transformation technology and weak current detection technology to achieve the accurate measurement of the grid voltage.It transforms the high voltage into low current by high voltage thick film resistor,then the current sensor transforms the low current signal into a standard analog voltage signal,thus an AD converter collects the voltage signal,and the value be imported into the microprocessor for filtration,calibration,coding.After filtering the data would be transmitted to the upper computer or relay protection devices of the digital substation.This paper focused on the design of hardware circuit of digital voltage transformer,developed the software package and produced a prototype control board.Initial experiments show that the scheme is valuable for digital substation.
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基于无线传感器网络的土壤湿度遥感监测
Soil humidity is considered as one of important soil parameters and is already used widely in agriculture information system.The measurement of the soil humidity,characterized by accuracy and continuity,can help build useful information systems for modem agriculture.Remote detection of soil humidity can be achieved easily by using wireless sensors network (WSN).In this paper,a way to build an automatic irrigating system taking advantage of humidity measurements,which is obtained based on Wireless Sensor Network,is proposed.That how the humidity is detected and how the WSN is constructed is discussed.Furthermore,the connection of hardware devices and theprograms of software is described.