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    Active vibration isolation device based on electromagnetic and aerostatic floatation
    11.
    发明授权
    Active vibration isolation device based on electromagnetic and aerostatic floatation 有权
    基于电磁和空气静力浮选的主动隔振装置

    公开(公告)号：US09145945B2

    公开(公告)日：2015-09-29

    申请号：US14376412

    申请日：2013-02-26

    Applicant: HARBIN INSTITUTE OF TECHNOLOGY

    Inventor： Jiubin Tan ,  Lei Wang ,  Rongwei Wen ,  Bo Zhao ,  Yuanyuan Yang

    IPC: F16M13/00 ,  F16F15/023 ,  F16F15/03

    CPC classification number: F16F15/023 ,  F16F15/022 ,  F16F15/0232 ,  F16F15/03

    Abstract: This invention relates to an active vibration isolation installation based on electromagnetic and aerostatic floatation which is essential for the super-precision measurement and manufacture. It mainly consists of an isolation platform, an intermediate sleeve and a base. The isolation platform supports any object(s) placed on the platform and is supported by the intermediate sleeve. And the intermediate sleeve is supported on the base which is fixed on the ground. This invention uses the combination electromagnetic and aerostatic floatation to achieve large bearing capacity while excellent vibration isolation performance is maintained. This invention realizes automatic control of stiffness, using closed-loop speed control methods. It is therefore conclude that this invention can impose an excellent inhibitory action on the vibration originating from surroundings and the platform itself.

    Abstract translation: 本发明涉及一种基于电磁和空气静力浮选的主动隔振装置，这对于超精密测量和制造至关重要。 它主要由隔离平台，中间套筒和底座组成。 隔离平台支撑放置在平台上并由中间套筒支撑的任何物体。 并且中间套筒支撑在固定在地面上的基座上。 本发明使用电磁和空气静电浮选的组合来实现大的承载能力，同时保持优异的隔振性能。 本发明使用闭环速度控制方法实现刚度的自动控制。 因此，可以得出结论，本发明可以对来自周围环境的振动和平台本身施加优异的抑制作用。

    SIX-DEGREE-OF-FREEDOM VIBRATIONAL EXCITATION FOUNDATION PLATFORM
    12.
    发明申请
    SIX-DEGREE-OF-FREEDOM VIBRATIONAL EXCITATION FOUNDATION PLATFORM 有权

    公开(公告)号：US20240418598A1

    公开(公告)日：2024-12-19

    申请号：US18670629

    申请日：2024-05-21

    Applicant: Harbin Institute of Technology

    Inventor： Chenglong Yu ,  Bin Li ,  Tianyi Li ,  Xuyang Yu ,  Bo Zhao

    IPC: G01M7/06

    Abstract: Provided is a six-degree-of-freedom vibrational excitation foundation platform, which solves the problem of the existing vibrational excitation foundation equipment that a vibrational excitation frequency band is narrow due to low natural frequency of the equipment. The six-degree-of-freedom vibrational excitation foundation platform includes a marble platform support frame, which is fixedly installed on a concrete floor through a backing plate; and a marble platform, which serves as an excitated device and is located in a middle of the support frame, and four sides of the marble platform support frame are connected to the motors fixedly connected to the support frame through connecting plates. The parallel connection of motor outputs solves the problem of insufficient excitation, and natural frequency of each part of the platform is increased by optimizing the marble platform and the support frame, such that the frequencies are controllable within the vibrational excitation frequency band.

    DESIGN METHOD FOR SUPPORT STRUCTURE OF LARGE-SCALE VIBRATIONAL EXCITATION PLATFORM
    13.
    发明申请
    DESIGN METHOD FOR SUPPORT STRUCTURE OF LARGE-SCALE VIBRATIONAL EXCITATION PLATFORM 有权

    公开(公告)号：US20240403498A1

    公开(公告)日：2024-12-05

    申请号：US18731449

    申请日：2024-06-03

    Applicant: Harbin Institute of Technology

    Inventor： Chenglong Yu ,  Tianyi Li ,  Bin Li ,  DeHai Li ,  Bo Zhao

    IPC: G06F30/10 ,  G01M7/02 ,  G06F30/23

    Abstract: Provided is a design method for a support structure of a large-scale vibrational excitation platform. The present invention designs a dimension of a support structure matching a dimension of the vibrational excitation platform, selects appropriate materials to guarantee structural stiffness, performs simulation and verification of finite elements to verify a natural frequency and stress deformation of the support structure, breaks down the support structure to facilitate processing, transportation and assembly, and optimizes structural parameters to enhance stability and stiffness of the support structure. The support structure designed using the design method in the present invention features strong stability, simple structure, high natural frequency and easy to mount. The support structure is assembled by means of welding and threaded connections, and is reinforced with reinforcement plates at important parts, such that structural stiffness and strength of the support structure are guaranteed.

    ULTRASONIC MEASUREMENT METHOD FOR PLANE STRESS ON THE BASIS OF MULTI-WAFER AIR-COUPLED TRANSDUCER
    14.
    发明公开
    ULTRASONIC MEASUREMENT METHOD FOR PLANE STRESS ON THE BASIS OF MULTI-WAFER AIR-COUPLED TRANSDUCER 审中-公开

    公开(公告)号：US20240060935A1

    公开(公告)日：2024-02-22

    申请号：US18232330

    申请日：2023-08-09

    Applicant: Harbin Institute of Technology

    Inventor： Weijia Shi ,  Bingquan Wang ,  Bo Zhao ,  Jiubin Tan

    IPC: G01N29/04 ,  G01N29/07

    CPC classification number: G01N29/041 ,  G01N29/07 ,  G01N2291/011

    Abstract: An ultrasonic measurement method for plane stress on the basis of a multi-wafer air-coupled transducer relates to the technical field of ultrasonic testing. The method solves problems that a traditional measurement method for plane stress generally computes the plane stress by changing at least 3 different measurement directions and obtaining information such as an acoustic time difference in the 3 measurement directions by using a pair of contact ultrasonic transducers, which is too complicated in operation, and a coupling agent can influence measurement accuracy of the plane stress. The method includes: emitting, by an excitation signal transmission end, an ultrasonic wave passing a wafer of the multi-wafer air-coupled transducer to a member to be measured; receiving, by an excitation signal reception end, an echo returned from the member to be measured through a corresponding wafer of the multi-wafer air-coupled transducer; obtaining an acoustic time difference of lamb waves through data processing according to the ultrasonic wave and the echo; and obtaining first principal stress, second principal stress and an included angle between the first principal stress and a fiber direction of an orthotropic composite material according to the acoustic time difference of the lamb waves. The method is suitable for the field of plane stress testing.

    Non-baseline On-line Stress Monitoring System and Monitoring Method Based on Multi-mode Lamb Wave Data Fusion
    15.
    发明公开
    Non-baseline On-line Stress Monitoring System and Monitoring Method Based on Multi-mode Lamb Wave Data Fusion 审中-公开

    公开(公告)号：US20230228718A1

    公开(公告)日：2023-07-20

    申请号：US17704081

    申请日：2022-03-25

    Applicant: Harbin Institute of Technology

    Inventor： Jiaxin Li ,  Jiubin Tan ,  Bo Zhao ,  Weijia Shi

    IPC: G01N29/07 ,  G01N29/34 ,  G01N29/36 ,  G01N29/46

    CPC classification number: G01N29/07 ,  G01N29/34 ,  G01N29/36 ,  G01N29/46 ,  G01N2291/0427

    Abstract: The present disclosure proposes a non-baseline on-line stress monitoring system and monitoring method based on multi-mode Lamb wave data fusion. A Lamb wave dispersion curve is established according to geometric dimensions and material parameters of a measured object, a cut-off frequency of a first-order Lamb wave mode is obtained, an excitation frequency of a Lamb wave signal is determined, and then pure Lamb waves in S0 and A0 modes obtained inside the measured object are obtained; an acoustoelastic equation is established, an elastodynamic equation of the measured object under a prestress condition is solved, and linear relationships between a group velocity and a stress of the Lamb waves in the S0 and A0 modes under the excitation frequency are obtained; data is processed through the on-line monitoring system; a stress gradient in a depth direction is calculated, and finally, a stress state of the measured object is represented. The present disclosure does not require data under a zero stress state as baseline data, does not require designing a wedge block capable of generating a critical refraction longitudinal wave, and combines acoustoelastic effects of Lamb waves in different modes to realize online stress monitoring without the baseline data.

    Ultrasonic phased array transducer device with two-dimensional hinge array structure
    16.
    发明授权
    Ultrasonic phased array transducer device with two-dimensional hinge array structure 有权

    公开(公告)号：US11536699B2

    公开(公告)日：2022-12-27

    申请号：US17079427

    申请日：2020-10-24

    Applicant: HARBIN INSTITUTE OF TECHNOLOGY

    Inventor： Weijia Shi ,  Bingquan Wang ,  Bo Zhao ,  Jiubin Tan

    IPC: G01N29/26 ,  G01N29/24

    Abstract: An ultrasonic phased array transducer device with a two-dimensional hinge array structure belongs to equipment in the technical field of ultrasonic detection. A connecting rod is fixedly connected to a fixed support and a two-dimensional hinge array respectively. Voice coil motors are symmetrically arranged in a shape of the British “Union Jack” with the connecting rod as a center, and are fixedly connected to the fixed support. Force output rods are respectively connected to voice coil motor coils and the upper surfaces of array units. Piezoelectric array elements are fixedly connected to the lower surfaces of all the array units. The numbers of the voice coil motors and the force output rods are 2N (N=4, 8, 12, 16, 20), the number of the piezoelectric array elements is 2N+1, and different N values are selected according to the sizes of workpieces to be detected. In the disclosure, by adjusting the current of each voice coil motor coil, the corresponding force output rod generates displacement to drive the two-dimensional hinge array unit to generate displacement, so as to push out and retract the hinge array unit and the piezoelectric array element fixedly connected below and drive the two-dimensional hinge array to generate deformation, so that the piezoelectric array elements fully fit with the surface of the workpiece to be detected. The disclosure can be applied to detection of the workpieces to be detected with flat surfaces, curved surfaces or spherical surfaces.

    ACTIVE VIBRATION ISOLATION DEVICE BASED ON ELECTROMAGNETIC AND AEROSTATIC FLOATATION
    19.
    发明申请
    ACTIVE VIBRATION ISOLATION DEVICE BASED ON ELECTROMAGNETIC AND AEROSTATIC FLOATATION 有权
    基于电磁和航空浮动的主动振动隔离装置

    公开(公告)号：US20140374565A1

    公开(公告)日：2014-12-25

    申请号：US14376412

    申请日：2013-02-26

    Applicant: HARBIN INSTITUTE OF TECHNOLOGY

    Inventor： Jiubin Tan ,  Lei Wang ,  Rongwei Wen ,  Bo Zhao ,  Yuanyuan Yang

    IPC: F16F15/023 ,  F16F15/03

    CPC classification number: F16F15/023 ,  F16F15/022 ,  F16F15/0232 ,  F16F15/03

    Abstract: This invention relates to an active vibration isolation installation based on electromagnetic and aerostatic floatation which is essential for the super-precision measurement and manufacture. It mainly consists of an isolation platform, an intermediate sleeve and a base. The isolation platform supports any object(s) placed on the platform and is supported by the intermediate sleeve. And the intermediate sleeve is supported on the base which is fixed on the ground. This invention uses the combination electromagnetic and aerostatic floatation to achieve large bearing capacity while excellent vibration isolation performance is maintained. This invention realizes automatic control of stiffness, using closed-loop speed control methods. It is therefore conclude that this invention can impose an excellent inhibitory action on the vibration originating from surroundings and the platform itself.

    Abstract translation: 本发明涉及一种基于电磁和空气静力浮选的主动隔振装置，这对于超精密测量和制造至关重要。 它主要由隔离平台，中间套筒和底座组成。 隔离平台支撑放置在平台上并由中间套筒支撑的任何物体。 并且中间套筒支撑在固定在地面上的基座上。 本发明使用电磁和空气静电浮选的组合来实现大的承载能力，同时保持优异的隔振性能。 本发明使用闭环速度控制方法实现刚度的自动控制。 因此，可以得出结论，本发明可以对来自周围环境的振动和平台本身施加优异的抑制作用。

    Method, system, device, and medium for online stress monitoring without baseline data based on single-mode multi-frequency signal fusion
    20.
    发明授权
    Method, system, device, and medium for online stress monitoring without baseline data based on single-mode multi-frequency signal fusion 有权

    公开(公告)号：US12203898B2

    公开(公告)日：2025-01-21

    申请号：US17704099

    申请日：2022-03-25

    Applicant: Harbin Institute of Technology

    Inventor： Bo Zhao ,  Jiubin Tan ,  Weijia Shi

    IPC: G01N29/46 ,  G01N29/04 ,  G01N29/24

    Abstract: A method, system, device, and medium for online stress monitoring without baseline data based on single-mode multi-frequency signal fusion are provided. The method includes: establishing a dispersion curve according to geometric dimensions and material parameters of a measured object; then solving an approximate linear relationship between propagation time of S0 modes with different frequencies and stress at a fixed propagation distance by using a relationship between stress and group velocity, the obtained linear relationship being an acousto-elastic equation required for final measurement; then performing Hilbert transformation on an obtained signal, extracting a signal envelope, and determining arrival time of two excitation frequency signals by means of a peak extraction algorithm and a time domain width of an excitation signal; and calculating a propagation time ratio and substituting the propagation time ratio into a pre-calibrated acousto-elastic equation to solve a stress value of an object to be measured. The disclosure is advantageous in that the multi-frequency data is fused by using dispersion characteristics of a single-mode Lamb wave and an acousto-elastic effect, thereby achieving online stress monitoring without baseline data.

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