Shenfang Yuan
共找到 9 条论著文献

1、Providing multiradio wireless sensor network with high-throughput and long-distance transmitting ability

2、A new temperature compensation method for guided wave-based structural health monitoring

摘要:A new temperature compensation technique combining optimal baseline selection and the filter based on Adaptive Linear Neuron Network was developed to enhance the robustness and effectiveness of guided Lamb wave-based damage detection. This paper focuses on three main issues for practically implementing the proposed method: (a) Establishment of temperature compensation standard; (b) Parameters design of compensation filter; (c) Determination of temperature gradient of baseline signals. Experiments were conducted on two stiffened composite plates to demonstrate the feasibility of proposed method under a temperature range from -40°C to 80°C for compensating temperature effects. Results showed that a reasonable temperature step for providing good temperature compensation can be up to 20°C in a baseline dataset.
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3、Structural Health Monitoring for Composite Material 2012

4、On propagation characteristics of shock waves generated under hypervelocity impact

5、Structural health monitoring and integrity management 2015

摘要:1 online resource (526 pages) : illustration Structural Health Monitoring and Integrity Management is a collection of the papers presented at the 2nd International Conference of Structural Health Monitoring and Integrity Management (ICSHMIM2014, Nanjing, China, 24-26 September 2014), and addresses the most recent developments in the field of Structural Health Monitoring (SHM) and integrity management from around the world. It is also generally acknowledged that a clear advantage of SHM-technology over traditional NDT methods is the closer interaction and automation of sensing, diagnostics, prognostics and condition-based maintenance that.
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6、Structural Health Monitoring and Integrity Management: Proceedings of the 2nd International Conference of Structural Health Monitoring and Integrity Management (ICSHMIM 2014), Nanjing, China, 24-26 Se 2015

7、Design of an All-Digital Impact Monitoring System for Large-Scale Composite Structure

摘要:In order to ensure the safety of large-scale composite structures of aircraft as well as to reduce the cost and time of maintenance, the impact monitoring on-line is urgently needed. A piezoelectric transducer (PZT)-based wireless digital monitor is developed to record the history and impact area of impact events on-line. Although the digital monitor is compactness and high efficiency for impact monitoring, the output caused by environmental noises from PZTs will lead to the failure of impact area localization and the weight, power consumption and data transmission of the digital monitor have to be optimized. In this paper, an impact area localization method combined with a digital sequences based de-noising method is studied. In the impact area localization method, a characteristic digital sequence identification method is proposed to eliminate digital rising edge caused by the noises in the digital sequences and estimate the impact area by identifying the first three digital rising edges in the de-noised digital sequences. Based on this method, a small size, low power consumption, and online all-digital impact monitoring system (ADIMS) is designed. Three experiments on noise simulation, impact monitoring function and continuous impact monitoring are performed, respectively, to validate the ADIMS. The validating results show that the accuracy rate of the impact area localization method is approximately 86% in the situation of simulated strong noises and the ADIMS can record continuous impact event when the interval time of two adjacent impacts is equal or longer than 2.0 × 10-3 s .
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8、Development of a PZT-based wireless digital monitor for composite impact monitoring

摘要:One of the major concerns in the whole lifetime of composite materials in aircraft is their susceptibility to impact damage. And there has existed a need in recent years to develop an online structural health monitoring (SHM) system for impact monitoring. This paper proposes a new PZT-based wireless digital impact monitoring system development method aimed at giving a localized area for further inspection. Based on this method, a PZT-based wireless digital impact monitor (WDIM) with advantages of compactness, light weight, low power consumption and high efficiency is developed. Differently from conventional SHM systems, the complex analog circuits are removed and the whole process is achieved in a digital way by turning the output of the PZT sensor directly into a digital queue through a comparator. A simple but efficient sub-region location method is implemented in a field programmable gate array (FPGA) as the processing core of the WDIM to detect and record the impact events. In addition, wireless communication technology is used in the WDIM to transmit data and form a monitoring network. To illustrate the capability of the WDIM, a complete process dealing with an impact event is investigated and the stability of the WDIM is also evaluated in this paper. The WDIM shows its potential for real online applications in aircraft.
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9、A miniaturized composite impact monitor and its evaluation research

摘要:From the Prognostic and Health Management (PHM) standpoint, the main purpose of the structural health monitoring is to help the maintenance of aircraft structures. Here, aiming at on-line applications, this paper puts forward a new digital impact localization method. Different from traditional processing methods, the new one is achieved in a digital way by turning the outputs of PZT sensors directly into digital queues and localizing the impact occurring area based on the digital queues obtained. Depending on this method, a PZT sensor array based impact monitor with advantages of miniaturized size, low weight and low energy consumption is developed which can meet the strict on-line application requests. Details of the new impact monitor design are presented in this paper. Meanwhile, a series of experiments, including evaluations on complex composite structures, have been conducted to verify the performance of the new digital impact monitor. This new monitor shows its potential for on-line structural PHM applications on aerospace vehicles.
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