CHEST AND ABDOMEN COUPLED CARDIOPULMONARY RESUSCITATION DEVICE

    公开(公告)号:US20230285229A1

    公开(公告)日:2023-09-14

    申请号:US18025517

    申请日:2022-05-11

    IPC分类号: A61H31/00

    摘要: A chest and abdomen coupled cardiopulmonary resuscitation device, including a bottom plate and at least two compression/traction mechanisms, wherein each of the two compression/traction mechanisms includes two linear motors with opposite positions, the axes of the two linear motors are perpendicular to the bottom plate, and the bottoms of the linear motors are in slip connection with the bottom plate; and the tops of the two linear motors are fixedly connected by a connecting mechanism, the bottom of the connecting mechanism is fixedly provided with a presser connected to an air pump, and the presser can move on the connecting mechanism along a direction perpendicular to the sliding direction of the linear motors. The device can be adjusted to the optimal compression frequency, depth and duration according to objective physiological indicators, thereby greatly improving success rate of rescue.

    GRID-CONNECTED CONTROL METHOD AND SYSTEM FOR GRID-FORMING CONVERTER WITHOUT GRID-SIDE VOLTAGE SENSOR

    公开(公告)号:US20240364116A1

    公开(公告)日:2024-10-31

    申请号:US18620094

    申请日:2024-03-28

    IPC分类号: H02J3/18 H02M7/5387

    CPC分类号: H02J3/44 H02M7/53871

    摘要: The present disclosure pertains to the field of power electronics technologies, and provides a grid-connected control method and system for a grid-forming converter without a grid-side voltage sensor. The grid-connected control method includes: performing coordinate transformation on a phase of a three-phase capacitor voltage sampled by a phase-locked loop (PLL) to obtain a first phase; in response to control of a first pulse width modulation (PWM) pulse signal, introducing a reference phase, and performing negative feedback regulation on a difference between the reference phase and the first phase to obtain a second phase; and in response to control of a second PWM pulse signal, performing a modulo operation on a difference between the reference phase and the second phase to obtain a third phase, where the third phase is used to replace a phase of the PLL to perform coordinate transformation of a system.

    Method of analyzing influencing factors of contribution rate of elastic energy of top plate during catastrophe of coal body

    公开(公告)号:US20240361294A1

    公开(公告)日:2024-10-31

    申请号:US18571358

    申请日:2023-01-09

    IPC分类号: G01N33/22 G01N3/00

    摘要: A method of analyzing influencing factors of a contribution rate of elastic energy of a top plate during catastrophe of a coal body; the specific steps are: obtaining coal seam gas pressure; according to a drilling histogram, obtaining coal seam thickness and top plate thickness; taking a core on site and processing the core into a standard test piece; obtaining, by means of an indoor mechanical test, elastic moduli of the top plate and of gas-containing coal, respectively; substituting the obtained elastic moduli and thicknesses of the top plate and of the gas-containing coal into a calculation formula so as to obtain the contribution rate of the elastic energy of the top plate; and analyzing the influence of the contribution rate of the elastic energy of the top plate in the two situations of configuring the same thickness ratio and a different elastic modulus ratio and the same elastic modulus ratio and a different thickness ratio. In the described method, the role of the elastic energy of the top plate in a coal-gas dynamic disaster is fully considered while the influencing factors of the contribution rate of the elastic energy are analyzed. The method has important theoretical significance and practical engineering value. Moreover, the method has positive significance for the prediction and prevention of mining-induced rock burst-coal and gas outburst and other complex dynamic mining disasters.

    Non-destructive testing method for article moisture content based on radio frequency identification

    公开(公告)号:US12105032B1

    公开(公告)日:2024-10-01

    申请号:US18586626

    申请日:2024-02-26

    发明人: Yunfan Yang Yang Zhao

    IPC分类号: G01N22/04 H01Q1/22

    CPC分类号: G01N22/04 H01Q1/2208

    摘要: A non-destructive testing method for article moisture content based on radio frequency identification (RFID) includes: S1, an electronic tag is attached to a surface of an article to be tested, and a signal transceiver is arranged above the electronic tag; S2, the signal transceiver sends a radio-frequency signal to the electronic tag and activates the electronic tag, and the signal transceiver simultaneously receives a backscattered signal from the electronic tag; and S3, the signal transceiver sends the backscattered signal to a signal processor. The method utilizes effects of different moisture content on backscattered signals, arranges the electronic tag on the article to be tested, processes the backscattered signal through the signal processor to obtain a processed signal, and transmits the processed signal to a monitor to display real-time moisture content curve of each article to be tested based on its corresponding serial number.

    Leveling control method for multi-point support platform

    公开(公告)号:US12097737B2

    公开(公告)日:2024-09-24

    申请号:US17208034

    申请日:2021-03-22

    摘要: The present disclosure discloses a leveling control method for a multi-point support platform, which comprises the steps: respectively measuring and obtaining a load-bearing interaction matrix and a deformation interaction matrix of the platform to construct a load-bearing and deformation joint control matrix; calculating the optimal loads of the legs and measuring the current loads of the legs to obtain the load deviation rates of the legs, and determining if the platform warrants leveling in combination with the two-dimensional inclination angles of the platform; constructing a platform geometry and leg load joint control equation according to the two-dimensional inclination angles of the platform, the load deviations of the legs and the load-bearing and deformation joint control matrix, calculating the actuation quantities of the legs and performing synchronous leveling; and determining the load deviation rates of the legs and the two-dimensional inclination angles of the platform cyclically and performing the actuation control until the leveling goal is achieved. The method is capable of synchronously realizing the geometric leveling of the platform and the load control of the legs, and can significantly improve the speed, geometric accuracy, process stability, leg load-bearing stability and control robustness of the leveling control for the multi-point support platform.