Zhejiang University

Jianqun Jiang

Yunmin Chen

Xuecheng Bian

Daosheng Ling

Chong Cheng

Hongguang Jiang

Renpeng Chen

Xiang Xu

Wanfeng Jin

Bo Huang

Weian Lin

Peng Xia

Zhehui Zhao

Yanguo Zhou

Chuanxiang Zheng

Bingbing Chen

Jiao Lin

Danyang Dou

Liming Tang

Ying Wu

Guanwen Liang

Chengpeng Hong

Chengbin Liu

Haoran Fu

Yiting Lu

Zizhuang Yan

Xia Tu

Bingjing Qiu

Yubing Wang

Haibo Xie

Provided is a flexible thin film pressure sensor applicable in a hypergravity centrifugal environment, comprising a composite thin film, two metal electrodes, and a flexible composite encapsulation layer. The composite thin film includes a polyvinylidene fluoride (PVDF) matrix and a carbon nanowire filled within the PVDF matrix. The PVDF matrix includes a lower PVDF layer and an upper PVDF layer. The two metal electrodes are respectively fixed to two surfaces of the composite thin film and overlap with each other. A region of the composite thin film located between the two metal electrodes is a polarized region. The flexible composite encapsulation layer has a double-layer structure, wherein two layers of the double-layered flexible composite encapsulation layer are disposed on the two surfaces of the composite thin film, respectively, and edge portions of the flexible composite encapsulation layer extend beyond the composite thin film and are fixed to each other.

Flexible thin films pressure sensors applicable in hypergravity centrifugal environments

A vacuum chamber structure of an ultra-high gravity geotechnical centrifuge device, comprising: a cylindrical shell, a convex head, a bottom head, a lower bearing sealing cover, and a vacuum pressure-bearing chamber formed by sealing a top cylindrical cylinder and an upper sealing plate with sealing rings; wherein a high-speed rotor system is enclosed in the vacuum pressure-bearing chamber, and a cylindrical cooling device is installed between an internal side of the cylindrical shell and the high-speed rotor system. An annular cooling device is provided directly above the hanging baskets on both sides of the centrifuge arm. A vibration isolation expansion joint is arranged at the intersection of the high-speed rotor system and the cylindrical cylinder, which isolates the vibration of the main engine from the vacuum chamber and greatly reduces the vibration.

Vacuum chamber structure of ultra-high gravity geotechnical centrifuge device

Provided is a three-directional motion decoupling periodic structure for a shaking table container. The periodic structure is formed by sequentially superimposing n periodic structure units, wherein each of the periodic structure units is formed by sequentially superimposing a first side-confining layer, a planar decoupling layer, a second side-confining layer and an elastic layer, wherein n is a positive integer greater than or equal to 2; the cross-sectional shapes of the first side-confining layer, the elastic layer, the second side-confining layer and the planar decoupling layer are the same; and the periodic structure is used for implementing three-directional motion decoupling in the operating condition of ground shaking. Further provided is a three-directional motion decoupling container for shaking table test, which is formed by combining the periodic structure, a container base plate and a position-limiting protection door-type frame (). The container, which is light in weight and high in strength, is applicable to the shaking table tests at hypergravity and normal gravity. Multiple measures are taken to ensure the motion synchronization between the container and tested soil, the non-interference of the motions of the container and the tested soil in the three directions of X, Y and Z, no extra acting force being exerted on the tested soil by the container, and the avoidance of a boundary effect as much as possible, so as to fully realize the three-directional decoupling and reconstitute original site characteristics.

Tri-axial motion decoupling periodic structure for shaking table container

The present invention discloses a simulated loading method and an apparatus for moving load of a whole train in rail transportation. Multiple actuators are arranged above rail sleepers along rail direction. The rail is cut into separate rail segments, which are connected to rail sleepers via fastening systems. Based on a verified train-rail-subgrade theory model, the distribution of fastener force under the movement of a train bogie can be obtained. A simplified expression of this solution can be acquired by Gauss function fitting considering the train axle load, which is used as the input load of actuators. Each actuator performs the same dynamic excitation sequentially with a time interval along the train moving direction. Therefore, moving load of different vehicle types at different train speeds can be simulated. The present invention provides a reliable and convenient test method and an apparatus for research of developing infrastructures of rail transportation.

Simulated loading method and apparatus for moving load of whole train in rail transportation

The present invention discloses a simulated loading method and an apparatus for moving load of a wheel axle in rail transportation. Multiple actuators are arranged right above rail sleepers along rail direction. The two continuous rails are connected to the rail sleepers via fastening systems and are cut into discrete independent rail segments right above the rail sleeper. The anti-drop member satisfies the applications of compression and uplift force of the actuator. The input load of each actuator is obtained from the load-time history of a single fastening system under moving load of a wheel axle according to a train-rail-subgrade theory model, and adjacent actuators perform dynamic excitation in turn with a same time interval to achieve simulation of moving load of a wheel axle under different speed. This invention provides a reliable and convenient loading platform for experimental study of the rail transportation.

Simulated loading method and apparatus for moving load of wheel axle in rail transportation

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Hangzhou, China

Jianqun Jiang