Wireless interrogation of a rectangular microstrip patch antenna for strain measurement is investigated by simulations.To analyze the antenna performance,a microstrip line-feeding patch antenna at 10 GHz is designed.A...Wireless interrogation of a rectangular microstrip patch antenna for strain measurement is investigated by simulations.To analyze the antenna performance,a microstrip line-feeding patch antenna at 10 GHz is designed.A patch antenna wirelessly fed by a horn is proposed to measure the strain.The direction information of strain detected by the patch antenna is also considered.The strain can be detected both in the width and length directions.It is shown that the strain can be measured wirelessly using a standard horn antenna.This kind of wireless strain-sensing technique offers significant potential for wireless structural health monitoring(SHM),especially for high-end equipment.展开更多
In order to achieve an access to strain sensor data with wireless transmission in bridge engineering structure testing, a wireless strain test system is presented based on the resistance strain sensor of networks. The...In order to achieve an access to strain sensor data with wireless transmission in bridge engineering structure testing, a wireless strain test system is presented based on the resistance strain sensor of networks. The wireless bridge strain test system composed of master station and substation adopts the wireless method to realize the high accuracy data acquisition between the master station and the substation under a reliable communication protocol. The system has been tested in contrast with the present strain apparatus. Results show that the wireless system is high-reliable, and has many characteristics such as high efficiency, good precision, high stability with low cost, and good flexibility, without using the present communication network.展开更多
A shear-lag theory was developed to investigate the strain transfer from the metal substrate to the surface acoustic wave （SAW） resonator through a bonding layer. A three-layer model of host structure-adhesive layer...A shear-lag theory was developed to investigate the strain transfer from the metal substrate to the surface acoustic wave （SAW） resonator through a bonding layer. A three-layer model of host structure-adhesive layer-resonator layer was established. The strain transfer was theoretically analyzed, and the main factors impacting the SAW sensor measurement were studied. The relationship between the sensor response and the individual effect of all these factors under static loads was discussed. Results showed that better accuracy could be achieved with increase in the adhesive stiffness or resonator length, or decrease in the adhesive thickness. The values of the strain transfer rate calculated from the analytical model agreed well with that from the available experiment data.展开更多
针对刮板输送机工作过程中刮板链张力及运行阻力的检测瓶颈问题,开发了一套基于微应变检测的刮板输送机张力测试系统,通过在刮板中安装应变片及无线信号收发装置实现对刮板链张力的检测,并对不同位置刮板链的张力及运行阻力进行分析。...针对刮板输送机工作过程中刮板链张力及运行阻力的检测瓶颈问题,开发了一套基于微应变检测的刮板输送机张力测试系统,通过在刮板中安装应变片及无线信号收发装置实现对刮板链张力的检测,并对不同位置刮板链的张力及运行阻力进行分析。实验测试结果表明,刮板过链轮时最大瞬时张力为342.681 3 k N,刮板在同一链轮啮入点与啮出点的最大张力差值为46 k N,刮板输送机上端链的最大运行阻力为41.4 k N,下端链运行阻力为22.2 k N,测试结果与现场实际工况基本一致,系统的检测精度与可靠性较高。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 51575015,51235001,51505013)
文摘Wireless interrogation of a rectangular microstrip patch antenna for strain measurement is investigated by simulations.To analyze the antenna performance,a microstrip line-feeding patch antenna at 10 GHz is designed.A patch antenna wirelessly fed by a horn is proposed to measure the strain.The direction information of strain detected by the patch antenna is also considered.The strain can be detected both in the width and length directions.It is shown that the strain can be measured wirelessly using a standard horn antenna.This kind of wireless strain-sensing technique offers significant potential for wireless structural health monitoring(SHM),especially for high-end equipment.
基金Sponsored by the Multidisciline Scientific Research Foundation of Harbin Institute of Technology(Grant No.HIT.MD2003.14)the Scientific Research Foundation of Liaoning Provincial Communication Department(Grant No.200516)
文摘In order to achieve an access to strain sensor data with wireless transmission in bridge engineering structure testing, a wireless strain test system is presented based on the resistance strain sensor of networks. The wireless bridge strain test system composed of master station and substation adopts the wireless method to realize the high accuracy data acquisition between the master station and the substation under a reliable communication protocol. The system has been tested in contrast with the present strain apparatus. Results show that the wireless system is high-reliable, and has many characteristics such as high efficiency, good precision, high stability with low cost, and good flexibility, without using the present communication network.
文摘A shear-lag theory was developed to investigate the strain transfer from the metal substrate to the surface acoustic wave （SAW） resonator through a bonding layer. A three-layer model of host structure-adhesive layer-resonator layer was established. The strain transfer was theoretically analyzed, and the main factors impacting the SAW sensor measurement were studied. The relationship between the sensor response and the individual effect of all these factors under static loads was discussed. Results showed that better accuracy could be achieved with increase in the adhesive stiffness or resonator length, or decrease in the adhesive thickness. The values of the strain transfer rate calculated from the analytical model agreed well with that from the available experiment data.
文摘针对刮板输送机工作过程中刮板链张力及运行阻力的检测瓶颈问题,开发了一套基于微应变检测的刮板输送机张力测试系统,通过在刮板中安装应变片及无线信号收发装置实现对刮板链张力的检测,并对不同位置刮板链的张力及运行阻力进行分析。实验测试结果表明,刮板过链轮时最大瞬时张力为342.681 3 k N,刮板在同一链轮啮入点与啮出点的最大张力差值为46 k N,刮板输送机上端链的最大运行阻力为41.4 k N,下端链运行阻力为22.2 k N,测试结果与现场实际工况基本一致,系统的检测精度与可靠性较高。
