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公开(公告)号：US11852610B2
公开(公告)日：2023-12-26
申请号：US18025403
申请日：2021-03-19
Applicant: HARBIN INSTITUTE OF TECHNOLOGY, SHENZHEN
Inventor： Donglai Zhang , Wei Gao , Xueli Zhu
CPC classification number: G01N29/12 , G01N29/048 , G01N2291/0234
Abstract: A method for detecting a tension force defect of a steel cable includes the following steps: step S10: providing an excitation sensor on a first position of a steel cable to be detected and providing a detection sensor on a second position of the steel cable; step S20: obtaining a value of a tension force on the steel cable and obtaining a first display diagram corresponding to the value of the tension force; step S30: loading a white noise signal on the excitation sensor through a power amplifier; step S40: acquiring a detection signal collected by the detection sensor; step S50: uploading the detection signal to a personal computer (PC) and performing a Fast Fourier Transform (FFT) process on the detection signal; step S60: determining whether there is a defect in the steel cable, and if so, performing step S70; step S70: determining a defect position of the steel cable.
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2.发明授权公开(公告)号：US11512976B2
公开(公告)日：2022-11-29
申请号：US17236237
申请日：2021-04-21
Applicant: Harbin Institute of Technology
Inventor： Ya Zhang , Qian Sun , Wei Gao , Fei Yu , Yanyan Wang , Xiuwei Xia , Jianxiong Wei , Weiqi Miao
Abstract: The disclosure discloses a latitude-free initial alignment method under a swaying base based on gradient descent optimization. Firstly, swaying base latitude-free alignment is regarded as a Wahba attitude determination problem to inhibit device noise interference, and an objective function is established based on a gravitational acceleration vector under an earth system; then an exact solution of the objective function is obtained through a gradient descent optimization method, and inertial system conversion quaternion estimation is achieved under the latitude-free condition; and finally, an attitude quaternion is determined by only using information of an accelerometer and a gyroscope of a strapdown attitude heading reference system, and therefore latitude-free initial alignment under the swaying base is achieved. The disclosure can solve the problem that initial alignment cannot be accomplished with unknown latitude under the swaying base, and thus the application range of the strapdown attitude heading reference system is ensured.
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公开(公告)号：US11703477B2
公开(公告)日：2023-07-18
申请号：US17436086
申请日：2021-03-17
Applicant: HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION)
Inventor： Dong Lai Zhang , En Chao Zhang , Wei Gao , Xiao Lan Yan , Shi Min Pan
Abstract: A nondestructive testing method for detecting and distinguishing internal and external defects of a wire rope includes: acquiring a magnetic flux signal and a MFL signal of a detected wire rope; preprocessing the magnetic flux signal and the MFL signal of the detected wire rope; comparing a preprocessed magnetic flux signal and a preprocessed MFL signal with a preset magnetic flux signal threshold and a preset MFL signal threshold respectively, and calculating a defect position; extracting a magnetic flux signal of a defect and an MFL signal of the defect based on the defect position; calculating a defect width of the detected wire rope based on the magnetic flux signal of the defect and the MFL signal of the defect; calculating a defect cross-sectional area loss of the detected wire rope based on the defect width; and determining whether the defect is the internal defect or the external defect.
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4.发明申请公开(公告)号：US20210262828A1
公开(公告)日：2021-08-26
申请号：US17236237
申请日：2021-04-21
Applicant: Harbin Institute of Technology
Inventor： Ya Zhang , Qian Sun , Wei Gao , Fei Yu , Yanyan Wang , Xiuwei Xia , Jianxiong Wei , Weiqi Miao
Abstract: The disclosure discloses a latitude-free initial alignment method under a swaying base based on gradient descent optimization. Firstly, swaying base latitude-free alignment is regarded as a Wahba attitude determination problem to inhibit device noise interference, and an objective function is established based on a gravitational acceleration vector under an earth system; then an exact solution of the objective function is obtained through a gradient descent optimization method, and inertial system conversion quaternion estimation is achieved under the latitude-free condition; and finally, an attitude quaternion is determined by only using information of an accelerometer and a gyroscope of a strapdown attitude heading reference system, and therefore latitude-free initial alignment under the swaying base is achieved. The disclosure can solve the problem that initial alignment cannot be accomplished with unknown latitude under the swaying base, and thus the application range of the strapdown attitude heading reference system is ensured.
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