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公开(公告)号：US20210350040A1
公开(公告)日：2021-11-11
申请号：US17052748
申请日：2020-03-06
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Tinghua YI , Mingsheng XUE , Chunxu QU , Hongnan LI
Abstract: The present invention belongs to the technical field of data analysis for structural testing, and relates to a method of the physical mode exaction for flexibility identification of engineering structures. In the present invention combined deterministic-stochastic subspace identification algorithm is first adopted to calculate basic modal parameters and modal scaling factors from state-space models of different orders. Subsequently, the relative scaling factor difference is added as a new modal indicator to the classic stabilization diagram to better clean out the stabilization diagram. And check the correctness of the selection of the stable axis using single-modal frequency-domain similarity index (SFSI) between single-order FRF and measured FRF. Then, further determine the physical modes from the modes in the stable axis using multi-modal frequency-domain similarity index (MFSI) between lower-order superposition FRF and measured FRF. Finally, calculate flexibility matrix using identified modal parameters and predict the displacement of the structure under static load.
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公开(公告)号：US20200033226A1
公开(公告)日：2020-01-30
申请号：US16342954
申请日：2018-03-12
Applicant: Dalian University of Technology
Inventor： Tinghua YI , Xiaomei YANG , Chunxu QU , Hongnan LI
IPC: G01M5/00
Abstract: Structural health monitoring relating to an automatic method for tracking structural modal parameters. First, Natural Excitation Technique is used to transform the random responses into correlation functions and Eigensystem Realization Algorithm combined with the stabilization diagram is used to estimate modal parameters from various response segments. Then, modes from the latter response segment are classified as traceable modes or untraceable modes according to correlations between their observability vectors and subspaces of the existing reference modes. Final, traceable modes will be grouped into specified clusters with the same structural characteristics on the basis of maximum modal observability vector correlation and minimum frequency difference. Meanwhile, union of the untraceable modes and existing reference modes are updated as the new reference modes which can be applied into the next tracking process. This can track the modal parameters automatically without artificial thresholds and the specified reference modes.
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公开(公告)号：US20250129897A1
公开(公告)日：2025-04-24
申请号：US18964199
申请日：2024-11-29
Applicant: GUANGXI UNIVERSITY , DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Yi ZHAO , KE YANG , Hongnan LI , Miao CUI
Abstract: The present invention relates to a rebound composite electromagnetic energy dissipation device for reducing sloshing with a liquid-filled ball for a large liquefied natural gas (LNG) storage tank. When the liquid surface sloshes around, the gas spring is pulled by the steel strand to produce vertical displacement and provide a restoring force, and the vertical displacement of the gas spring drives the fan blades on the sleeves of the ball screws at the bottom to rotate in the damping fluid, consuming energy. The present invention uses hydraulic transmission instead of mechanical transmission of traditional piston motion, and the horizontal pistons produce horizontal displacement in the case of pressure unbalance, thus increasing the flexibility of horizontal piston motion; magnets are arranged in the horizontal slideways and the horizontal pistons to intensify the motion of the horizontal pistons and the relative motion between the horizontal pistons and the interior.
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公开(公告)号：US20210148114A1
公开(公告)日：2021-05-20
申请号：US16968782
申请日：2019-09-20
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Xing FU , Hongnan LI , Wenlong DU , Xifeng ZHONG
Abstract: A self-resetting tuned mass damper is based on eddy current and shape memory alloy technology. The self-resetting tuned mass damper comprises a hollow box, a cover plate, a bolt, a mass block, gears a, gears b, gears c, copper sheets, permanent magnet groups, partition boards, balls, pins, levers, shape memory alloys, rotating shafts a, rotating shafts b, a supporting plate and rotating shafts c. The movement of the mass block causes the copper sheets to rotate and generate eddy current for energy consumption. The copper sheets are rotated and amplified by adjusting the sizes of the gears. The displacement of a small mass block can cause rotation of the copper sheets by a large angle, which greatly increases energy consumption efficiency. The elongation of the shape memory alloys is amplified by adjusting the ratio of long and short force arms of the levers.
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公开(公告)号：US20210087841A1
公开(公告)日：2021-03-25
申请号：US16967683
申请日：2019-09-20
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Xing FU , Hongnan LI , Gang LI , Yao JIANG , Wenlong DU , Zhiqian DONG
Abstract: An inertial mass amplification type tuned mass damper is disclosed. The inertial mass amplification type tuned mass damper comprises a hollow box, an H-shaped mass block, gears a, gears b, a rectangular frame, a steel ring, viscous dampers, a steel sheet, springs, rotating shafts and balls. In the present invention, an inertial damping force is amplified by adjusting the radius ratio of the gears a and the gears b; and damping parameters can be conveniently changed by adjusting the mass of the mass block, the spring stiffness and the like. The present invention has the advantages that the design mass is small, which can avoid the adverse effects of excessive additional gravity on the structure and improve the performance of the structure. The present invention has reasonable design and small occupied space, can save more use area for buildings and can greatly improve the utilization efficiency of the buildings.
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Patent Agency Ranking
公开(公告)号：US20200074221A1
公开(公告)日：2020-03-05
申请号：US16342948
申请日：2018-03-28
Applicant: Dalian University of Technology
Inventor： Tinghua YI , Xiaomei YANG , Chunxu QU , Hongnan LI
Abstract: Structural health monitoring relating to an automatic method for estimating structural modal parameters by clustering. The structural modal parameters from state-space models are calculated in different orders by Natural Excitation Technique in combination with Eigensystem Realization Algorithm According to the characteristics that physical modes are those with high similarity and stably appearing at different orders while spurious modes are those with little similarity and unstably appearing at different orders, the modal dissimilarity between two nearest modes in consecutive order are considered as feature of the mode in the lower order. Then, features of modes are used in fuzzy C-means clustering to adaptively acquire the stable cluster where modes are with high similarity. Finally, Hierarchical clustering is used to group the stable modes with identical modal parameters together and thus each physical mode can be obtained.
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公开(公告)号：US20190171691A1
公开(公告)日：2019-06-06
申请号：US16321183
申请日：2018-03-06
Applicant: Dalian University of Technology
Inventor： Chunxu QU , Tinghua YI , Hongnan LI
Abstract: The presented invention belongs to the technical field of data analysis for structural health monitoring, and relates to a method of the mode order determination for the modal identification of engineering structures. The presented invention first calculates the structural natural frequencies for every order by eigensystem realization algorithm. Then the modal responses for every natural frequency are extracted. After obtaining the square mean root of modal responses, the modal response contribution index (MRCI) is calculated by summation of square mean root for every degree-of-freedom. The relation map between mode order and MRCI is drawn. The mode order is determined by the obvious gap between two adjacent MRCI according to the relation map. This order is also the truncated order of singular matrix in the eigensystem realization algorithm, which is useful to identify other modal parameters accurately.
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8.发明申请公开(公告)号：US20190121838A1
公开(公告)日：2019-04-25
申请号：US16090911
申请日：2018-02-12
Applicant: Dalian University of Technology
Inventor： Tinghua YI , Haibin HUANG , Hongnan LI
IPC: G06F17/18
Abstract: The present invention belongs to the technical field of health monitoring for civil structures, and a dynamically non-Gaussian anomaly identification method is proposed for structural monitoring data. First, define past and current observation vectors for the monitoring data and pre-whiten them; second, establish a statistical correlation model for the whitened past and current observation vectors to obtain dynamically whitened data; then, divide the dynamically whitened data into two parts, i.e., the system-related and system-unrelated parts, which are further modelled by the independent component analysis; finally, define two statistics and determine their corresponding control limits, respectively, it can be decided that there is anomaly in the monitoring data when each of the statistics exceeds its corresponding control limit. The non-Gaussian and dynamic characteristics of structural monitoring data are simultaneously taken into account, based on that the defined statistics can effectively identify anomalies in the data.
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公开(公告)号：US20240169020A1
公开(公告)日：2024-05-23
申请号：US18025235
申请日：2022-06-10
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Xing FU , Xingheng ZHANG , Hongnan LI , Gang LI , Shi GAN , Wenlong DU
IPC: G06F17/16 , G06F30/20 , G06F111/10
CPC classification number: G06F17/16 , G06F30/20 , G06F2111/10
Abstract: A wind field interpolation simulation method based on isogeometric sampling, the main steps of generating a wind speed time series in the present invention are as follows: first, inputting basic parameters of wind field simulation and the number of initial sampling points, and selecting the sampling points by an isogeometric sampling method. Then calculating the maximum relative error of all frequency bands by a relative error defined, and judging a fitting error and an allowable error given. If the fitting error is greater than the allowable error, increasing the number of sampling points and reselecting the sampling points; if the fitting error is less than or equal to the allowable error, finishing point selection, and using an interpolation function to calculate a lower triangular matrix required by the simulation. Thus a fluctuating wind field can be generated by a harmonic superposition method.
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10.发明申请公开(公告)号：US20230058314A1
公开(公告)日：2023-02-23
申请号：US17617867
申请日：2021-06-30
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Hongnan LI , Linsheng HUO , Gang LI , Jing ZHOU , Zhuodong YANG
Abstract: A structure multi-dimensional loading test system considering real complex boundary conditions considering real complex boundary conditions comprises a main part of machine, a base part, a hydraulic power supply and a control system. The system can simulate the load borne by a structure in a real working environment better and more accurately, realize multi-dimensional loading of the structure with six degrees of freedom in space and provide more real and valuable experimental data for the research on damage of reinforced concrete materials, components and structures under the action of an earthquake, and the research results will help researchers further reveal the damage mechanism of reinforced concrete structures, put forward the corresponding damage criteria and develop the corresponding seismic design methods.
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