China University of Petroleum

Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd.

Other

Shandong University

Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd. (cn)

Kun Wang

Hui Liu

Yang Yang

Xianmin Zhang

Kai Chen

Sen Wang

Guangming Zhang

Qihong Feng

Jiyuan Zhang

Wei Liu

Yawei Zhang

Quan Liu

Bingchen Liang

Zhihua Zhang

Hao Wang

Xiang Wang

Jinjie Sun

Ying Xu

Luzhou Liu

Yangxuan Su

Xinying Pan

Haonan Jiang

Yuqing Feng

Shunming Li

Yijing Du

Xiaokang Zhu

Zheng Wu

Chengmin Liu

Xunhan Xie

Yongtao Tian

Mingming Sun

Anshen Zhang

Xianding Yang

Xiaobo Liu

Lankun Chen

Guohong Zhang

Tong Wang

Xiaohui Ren

Xudong Liu

Hui Huang

He Zhang

Yandong Zhang

Pengfei Duan

The present disclosure relates to the field of GNSS and INS integrated navigation technology, and specifically discloses a GNSS and INS integrated navigation positioning method and a system thereof. To addresses the technical problem of positioning error divergence in integrated navigation systems caused by insufficient satellite visibility or strong multipath effects in GNSS denial environments, a method combining motion constraint algorithm and neural network algorithm is proposed for robustness by the present disclosure. The motion constraint algorithm is very stable, but it cannot self-adaptively adjust the constraint threshold based on the vehicle motion state. The neural network algorithm has strong flexibility, but the obtained predicted values inevitably have outliers. The present disclosure combines motion constraints with the neural network algorithms, enabling these two algorithms to complement advantages of each other, thereby effectively improving the positioning accuracy and reliability of the integrated navigation system after GNSS losing lock.

GNSS and INS integrated navigation positioning method and system thereof

The present disclosure relates to a method and system for predicting a time-varying principle of waterflooding oil reservoir formation parameters. Firstly, a Tspectrum-pore size relation model is built according to a measured pore size distribution curve and a measured Tspectrum. A Tspectrum of a rock sample at different water injection amounts during a waterflooding physical simulation experiment is acquired. The acquired Tspectrum at different water injection amounts is then converted into a pore size distribution at different water injection amounts, and a pore network model at different water injection amounts is built with the pore size distribution. Oil-water two-phase flow simulation is performed, and a corresponding oil-water two-phase relative permeability curve of the rock sample at different pore volume (PV) multiples is obtained eventually. The oil-water two-phase relative permeability curve is the formation parameters in the waterflooding oil reservoir.

Method and system for predicting time-varying principle of waterflooding oil reservoir formation parameters

The present invention relates to the technical field of fault location of distributed energy resources connected flexible DC distribution network, and disclosed a fault location method, system and application of bipolar short-circuit of two-level VSC-type photovoltaic-connected flexible DC distribution network, wherein, directions of positive currents of DC feeders during fault are used to locate a fault section; a bipolar short-circuit distance measurement model covering interactions and responses of systems is established according to equivalent circuits of transient periods; and fault location is done by obtaining a distance to fault with electric parameters and information of the fault. With the technical solutions offered in the present invention, accurate location of the fault can be done with the electric parameters and information of the fault, a key technology is provided for quick location of bipolar short-circuit of flexible DC distribution network, power supply reliability of the system is further improved, errors due to differentiation of the conventional distance measurement methods are effectively avoided, the location results are more accurate and of high stability, in this way, further development of flexible DC distribution network can be promoted and building of a new power system in the background of energy transition is facilitated.

Fault location method, system and application of two-level VSC type photovoltaic connected bidirectional flexible DC distribution network

The present application relates to an opening and closing mechanism and a train having the same. The opening and closing mechanism comprise a driving device, a locking device and a support arm; the driving device is connected to the locking device to drive the locking device to rotate; a first end of the locking device is rotatably mounted on a baseplate; a sliding groove in which a second end of the locking device is slidably located is formed on the support arm; a first end of the support arm is rotatably mounted on the baseplate; a second end of the support arm is connected to a fairing; the driving device drives the locking device to rotate, the locking device drives the support arm to rotate by the sliding groove, so that the support arm opens or closes the fairing.

Opening and closing mechanism and train having the same

The present invention discloses a pile foundation permeable breakwater with variable permeability, comprising: two rows of prefabricated pile foundations. The tops of the prefabricated pile foundations are fixedly provided with a prefabricated panel. The top of the prefabricated panel is provided with a wave wall and a breast wall. The prefabricated pile foundations are integrally connected with fixed wave breaking plates; sliding rails are installed correspondingly on the top and the bottom between every two adjacent prefabricated pile foundations in the same row; and movable wave breaking plates are slidably connected between each pair of sliding rails. A control system for controlling the slide of the movable wave breaking plates is installed on the prefabricated panel. The present invention also discloses a construction method of the pile foundation permeable breakwater with variable permeability.

Pile foundation permeable breakwater with variable permeability and construction method thereof

A method and system for configuring regenerative braking energy recovery devices in urban rail transit provided by the present application, successively including the following steps: calculating a preliminarily configured capacity Pof a regenerative braking energy recovery device predetermined for the traction substation n, then obtaining an optimally configured capacity Qof the regenerative braking energy recovery devices; further, configuring the total number of the regenerative braking energy recovery devices; finally, configuring the type of the regenerative braking energy recovery devices. By reasonably configure the capacity and number of regenerative braking energy recovery devices in traction substations, the configuring method of the present application allows the regenerative braking energy generated by a train during braking to be completely absorbed, thus reduce the energy consumption of braking resistors. Meanwhile, the waste of idle regenerative braking energy recovery devices is avoided, and the acquisition cost of devices is reduced. By reasonably configuring the type of regenerative braking energy recovery devices, the deficiencies of a single regenerative braking energy recovery device can be avoided.

Method and system for configuring regenerative braking energy recovery devices in urban rail transit

The present invention relates to the field of mechanical manufacturing technology, relating to a locking device. The locking device comprise a casing with a first end and a second end; a hole is formed on the first end, and the second end has an opening; a rod is provided within the casing; and a fastener is provided on the end portion of the rod outside the casing; a raised member located outside the casing is provided at a second end portion of the rod, the raised member having a diameter greater than a diameter of the opening and a gap being formed between the raised member and the casing; a spring is sleeved on the rod, and a first shaft is provided at the second end portion. An opening and closing mechanism having the locking device is further provided for the opening or closing of a fairing.

Locking device and opening and closing mechanism having the same

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Qingdao, China

Kun Wang