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Analysis of human-footbridge-MTMD coupled system and MTMD optimization design based on the pseudo-excitation method

Zhendong Gongcheng Xuebao/Journal of vibration engineering 2025年第4期38卷 794-802页

作者： Wen, Jinlong Li, Yang Wang, Zhihao Chen, Aijiu Hu, Mingyi College of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou450045 China Faculty of Civil Engineering and Mechanics Kunming University of Science and Technology Kunming650000 China Henan Engineering Research Center for Structural Vibration Control and Health Monitoring Zhengzhou450045 China Engineering Vibration Control Technology Research Center State Machinery Group Science and Technology Research Institute Co. Ltd. Beijing100083 China

To establish the optimal design method of multiple tuned mass damper（MTMD）for the footbridge considering the vertical human-structure interaction，the parameters randomness of the mass-spring-damper（MSD）pedestrian model is simulated，and the vertical dynamic response of the random crowd-footbridge-MTMD system is calculated based on the pseudo-excitation method. Then，the effect of vertical human-structure interaction on the dynamic response of the footbridge-TMD system is demonstrated. Finally，based on the H2 performance of the acceleration transfer function and response surface methodology of the coupled system，an optimal design method of MTMD for footbridge vibration control considering vertical human-structure interaction is established. The results show that the dynamic response calculation method of the coupled system avoids a large number of nonlinear time history analyses，and the power spectrum and root mean square of the coupled system response can be obtained efficiently. The vertical human-structure interaction makes the TMD detuning effect significant，and the reduction rate of TMD with 3% mass ratio decreases by 37.19% when the crowd density increases from 0.25 person/m2 to 1.25 person/m2. The proposed MTMD optimization design method for footbridge has an average mitigation rate of over 70% for footbridge acceleration response. © 2025 Nanjing University of Aeronautics an Astronautics. All rights reserved.

关键词： Dynamic response

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Multi-Material and Multiscale Topology Design Optimization of Thermoelastic Lattice Structures

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Computer Modeling in engineering & Sciences 2022年第2期130卷 967-986页

作者： Jun Yan Qianqian Sui Zhirui Fan Zunyi Duan StateKey Laboratory of Structural Analysis for Industrial Equipment Department of EngineeringMechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian116024China Ningbo Research Institute of Dalian University of Technology Ningbo315016China Institute of Structural Health Monitoring and Control School of MechanicsCivil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an710072China

This study establishes amultiscale andmulti-material topology optimization model for thermoelastic lattice structures(TLSs)consideringmechanical and thermal loading based on the ExtendedMultiscale Finite ElementMethod(EMsFEM).The corresponding multi-material and multiscale mathematical formulation have been established with minimizing strain energy and structural mass as the objective function and constraint,*** Solid Isotropic Material with Penalization(SIMP)interpolation scheme has been adopted to realize micro-scale multi-material selection of truss *** modified volume preserving Heaviside function(VPHF)is utilized to obtain a clear 0/1 material of truss *** with the classic topology optimization of single-material TLSs,multi-material topology optimization can get a better structural design of the *** effects of temperatures,size factor,and mass fraction on optimization results have been presented and discussed in the numerical examples.

关键词： Multi-material design optimization thermoelastic lattice structure multiscale topology optimization mass constraint strain energy

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A study on vertical fundamental frequency and dynamic response under human-induced load of suspended floors

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Zhendong yu Chongji/Journal of vibration and Shock 2024年第24期43卷 234-242and258页

作者： Wang, Zhihao Song, Luyao Li, Yang Chen, Aijiu Hu, Mingyi Xu, Yanwei College of Civil Engineering and Transportation North China University of Water Resources and Eleetric Power Zhengzhou450045 China Henan Engineering Research Center for Structural Vihration Control and Health Monitoring North China University of Water Resources and Electric Power Zhengzhou450045 China Engineering Vihration Control Technology Research Center State Machinery Group Science and Technology Research Institute Co. Ltd. Beijing100083 China

A large-span suspended floor is a flexible structure, which may cause vibration serviceability problems under human-induced vertical loads. In order to study the vertical vibration Performances of suspended floors, firstly, vertical vibration of a suspended floor was compared between a field test and finite element Simulation. Then, using asingle-story equivalent model of the unidirectional ribbed suspended floor System and based on the energy principle, a simplified calculation formula for the vertical fundamental frequency of the floor was derived. Finally, a multi factor impact analysis of the floor fundamental frequency was carried out, and an evaluation process for the serviceability of human-induced vertical vibration of the suspended floor were summarized. Results show that, proposed based on the theory of floor bending vibration, the simplified formula for the vertical fundamental frequency of the suspended floor is accurate, and it is suitable for rapid evaluation of the dynamic Performance. The vertical fundamental frequency of the suspended floor can be improved by reducing the spacing between rib beams appropriately, increasing the stiffness of ribs and beams, and arranging hanging pillars reasonably, to avoid excessive vibration when the natural vibration frequency of the suspended floor is close to the frequency of the pedestrian excitation. For the suspended floor under single pedestrian Walking, the dynamic response results of theoretical calculation, finite element Simulation and field measurement are in good agreement. The results can provide reference for the vibration Performance analysis and the vertical vibration serviceability evaluation of the suspended floor. © 2024 Chinese vibration engineering Society. All rights reserved.

关键词： vibration analysis

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Thermoelastic structural Topology Optimization Based on Moving Morphable Components Framework

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Computer Modeling in engineering & Sciences 2021年第9期128卷 1179-1196页

作者： Jun Yan Qi Xu Zhirui Fan Zunyi Duan Hongze Du Dongling Geng Department of EngineeringMechanics StateKey Laboratory of StructuralAnalysis for Industrial EquipmentInternational Research Center for Computational MechanicsDalian University of TechnologyDalian116024China Institute of Structural Health Monitoring and Control School of MechanicsCivil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Ningbo Research Institute of Dalian University of Technology Ningbo315016China

This study investigates structural topology optimization of thermoelastic structures considering two kinds of objectives ofminimumstructural compliance and elastic strain energy with a specified available volume *** explicitly express the configuration evolution in the structural topology optimization under combination of mechanical and thermal load conditions,the moving morphable components(MMC)framework is *** on the characteristics of the MMC framework,the number of design variables can be reduced *** optimization formulation in the MMC topology optimization framework and numerical solution procedures are developed for several numerical *** optimization results are obtained with structural compliance and elastic strain energy as objectives,respectively,for thermoelastic *** effectiveness of the proposed optimization formulation is validated by the numerical *** is revealed that for the optimization design of the thermoelastic structural strength,the objective function with the minimum structural strain energy can achieve a better performance than that from structural compliance design.

关键词： Thermoelastic structure topology optimization moving morphable components minimum structural compliance minimum strain energy

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Full-Scale Cutting Experiments of Different Granite Integrity Using Tunnel Boring Machine Disc Cutter

SSRN

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SSRN 2022年

作者： Sun, Hao-Kai Gao, Yang Chen, Yong Geotechnical and Structural Engineering Research Center Shandong University Jinan250061 China Key Laboratory for Structure Health Monitoring and Control in Hebei Province Shijiazhuang Tiedao University Shijiazhuang050043 China

The complex geological conditions of tunnels with tunnel boring machine make geological exploration very difficult. To explore the method of predicting the rock mass integrity based on the cutterhead vibration signal, the mapping relationship between the rock mass integrity, cutter forces, and cutterhead vibration was studied by the full-scale rotary cutting machine. Our finding is that the mean amplitude, the single peak value of the normal force, and the RMS values of the cutterhead vibration all increase with ascending rock mass integrity. The average amplitude and single peak value decrease, and the RMS value increase with the increase of the rotation speed. The average amplitude increases, the single peak value decreases, and the RMS value increases as the advance speed increase. We demonstrated that there is an obvious corresponding relationship between the normal force and the vibration, and rock mass and operating parameters have significant effects on the vibration characteristics. © 2022, The Authors. All rights reserved.

关键词： Boring machines (machine tools)

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Evolution Law of Frost-Heaving Pressure of Frozen Circles in Surrounding Rock around Water-Rich Tunnels in Cold Regions

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Zhongguo Gonglu Xuebao/China Journal of Highway and Transport 2022年第9期35卷 340-351页

作者： Zheng, Xin-Yu Xu, Fei Sun, Hao-Kai Gao, Yang Wei, Li-Yuan Geotechnical and Structural Engineering Research Center Shandong University Shandong Jinan250061 China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining and Technology Jiangsu Xuzhou221116 China School of Civil Engineering Southwest Jiaotong University Sichuan Chengdu610031 China

The frost-heaving evolution mechanism of frozen circles in surrounding rock around water-rich tunnel is a key scientific problem that affects the operation safety in cold regions. To explore the evolution law of frost-heaving pressure in frozen circles in such surrounding rock, scaled three-dimensional geomechanical model tests were carried out. In these tests, freezing of a water-bearing surrounding rock at low temperature was considered. The temperature field distribution characteristics of surrounding rock at the tunnel portal section was simulated by introducing ambient air into the tunnel for cooling. Micro-pressure sensors were employed to dynamically monitor the frost-heaving pressure in real time. The spatial and temporal evolution curves of the frost-heaving pressure were obtained for various water content and thickness in surrounding rock. The fitting formulas for parameters such as the frost-heaving rate of surrounding rock, thickness of the frozen circles, and water content were established utilizing multiple regression analysis. Based on this, a theoretical solution for the frost-heaving pressure of the frozen circles in surrounding rock under plain strain state was derived considering the influence of water content and proportion index of surrounding rock. The thermal stress method was used to simulate the evolution characteristics of frost-heaving pressure. Combined with numerical simulations, the test method and theoretical solution were further verified by comparing the predicted frost-heaving pressure with the theoretical and test values. The results indicate that the temperature field of surrounding rock undergoes changes in three stages. This is similar to a regular spoon with a handle-like evolution process;the temperature field of the water-bearing surrounding rock exhibits a non-linear distribution in the descending stage;the temperature field of surrounding rock shows a lagging characteristic relative to the environmental temperature. The sha

关键词： Temperature

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Blind source extraction based on EMD and temporal correlation for rolling element bearing fault diagnosis

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Smart and Resilient Transportation 2021年第1期3卷 52-65页

作者： Xuejun Zhao Yong Qin Hailing Fu Limin Jia Xinning Zhang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Beijing Jiaotong University Beijing China and National Engineering Laboratory for System Safety and Operation Assurance of Urban Rail Transit Guangzhou China Structural Integrity and Health Monitoring Group Department of Aeronautics Imperial College London UK London China Railway Rolling Stock Corporation Limited Beijing China

Purpose Fault diagnosis methods based on blind source separation (BSS) for rolling element bearings are necessary tools to prevent any unexpected accidents. In the field application, the actual signal acquisition is usually hindered by certain restrictions, such as the limited number of signal channels. The purpose of this study is to fulfill the weakness of the existed BSS method. Design/methodology/approach To deal with this problem, this paper proposes a blind source extraction (BSE) method for bearing fault diagnosis based on empirical mode decomposition (EMD) and temporal correlation. First, a single-channel undetermined BSS problem is transformed into a determined BSS problem using the EMD algorithm. Then, the desired fault signal is extracted from selected intrinsic mode functions with a multi-shift correlation method. Findings Experimental results prove the extracted fault signal can be easily identified through the envelope spectrum. The application of the proposed method is validated using simulated signals and rolling element bearing signals of the train axle. Originality/value This paper proposes an underdetermined BSE method based on the EMD and the temporal correlation method for rolling element bearings. A simulated signal and two bearing fault signal from the train rolling element bearings show that the proposed method can well extract the bearing fault signal. Note that the proposed method can extract the periodic fault signal for bearing fault diagnosis. Thus, it should be helpful in the diagnosis of other rotating machinery, such as gears or blades.

关键词： Fault diagnosis Blind source extraction Signal decomposition Temporal correlation

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Conception and Exploration of Using Data as a Service in Tunnel Construction with the NATM

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engineering 2018年第1期4卷 123-130页

作者： Bowen Du Yanliang Du Fei Xu Peng He State Key Laboratory of Software Development Environment Beihang University Beijing 100083 China Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang 050043 China Research Center of Geotechnical and Structural Engineering Shandong University Jinan 250061 China

The New Austrian Tunneling Method （NATM） has been widely used in the construction of mountain tun- nels, urban metro lines, underground storage tanks, underground power houses, mining roadways, and so on, The variation patterns of advance geological prediction data, stress-strain data of supporting struc- tures, and deformation data of the surrounding rock are vitally important in assessing the rationality and reliability of construction schemes, and provide essential information to ensure the safety and scheduling of tunnel construction, However, as the quantity of these data increases significantly, the uncertainty and discreteness of the mass data make it extremely difficult to produce a reasonable con- struction scheme; they also reduce the forecast accuracy of accidents and dangerous situations, creating huge challenges in tunnel construction safety, In order to solve this problem, a novel data service system is proposed that uses data-association technology and the NATM, with the support of a big data environ- ment, This system can integrate data resources from distributed monitoring sensors during the construc- tion process, and then identify associations and build relations among data resources under the same construction conditions, These data associations and relations are then stored in a data pool, With the development and supplementation of the data pool, similar relations can then he used under similar con- ditions, in order to provide data references for construction schematic designs and resource allocation, The proposed data service system also provides valuable guidance for the construction of similar projects.

关键词： New Austrian Tunneling Method Big data environments Data as a service Tunnel construction

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A flexible and lightweight impact monitoring system with ultra-low power consumption for aircraft smart composite skin 12

A flexible and lightweight impact monitoring system with ult...

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12th International Workshop on structural health monitoring: Enabling Intelligent Life-Cycle health Management for Industry Internet of Things (IIOT), IWSHM 2019

作者： Qiu, Lei Lin, Xiaodong Wang, Yu Yuan, Shenfang Huang, Yon Gan Research Center of Structural Health Monitoring and Prognosis State Key Lab of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China State Key Lab of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781605956015

Aircraft Smart Composite Skin (ASCS) which has the capability of structural health monitoring (SHM) for large-scale aircraft composite structures to monitor impact needs to be developed because the poor impact resistance of composite structures may lead to barely visible impact damage and result in stiffness degradation and a significant loss of structural integrity. However, the impact is an instantaneous event so that it needs to be monitored on-line continuously during the whole service lifetime of the ASCS. Thus considering the strict restrictions of aerospace application, an impact monitoring system and sensor network is required to be low weight, low power consumption and high reliability. In this paper, an impact monitoring system with advantages of compactness, ultra-thin, light weight, ultra-low power consumption and high efficiency is developed to meet the strict requests of on-line application. Differently from conventional impact monitoring systems, the complex circuits are greatly simplified and the whole impact monitoring process is achieved in a digital way by turning the output of the piezoelectric sensors directly into digital sequences through a two-level digitalized mechanism which is realized by combing diode array with a Micro-Process Unit (MPU). A simple but efficient impact-region localization method is implemented in the MPU. In addition, the impact monitoring system is realized in a flexible way so that it can be embedded onto the composite structure to be a mechatronic system to realize impact monitoring on-line continuously. To illustrate the capability of the impact monitoring system, it is integrated with a flexible piezoelectric sensor array to construct a large-scale impact monitoring sensor network system. The network system is integrated on the surface of a large-scale stiffened carbon fiber reinforced plate to become an ASCS and the impact monitoring ability of the ASCS is validated. © International Workshop on structural health Mon

关键词： structural health monitoring

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A flexible-integrated impact monitoring system for aircraft composite structures 9

A flexible-integrated impact monitoring system for aircraft ...

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9th European Workshop on structural health monitoring, EWSHM 2018

作者： Qiu, Lei Yuan, Shenfang Deng, Xiaolei Huang, Yongan Ren, Yuanqiang Research Center of Structural Health Monitoring and Prognosis State Key Lab of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics China State Key Lab of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

In recent years, large-scale composite structures have been widely applied on large aircrafts. However, the poor impact resistance of composite structures may lead to barely visible impact damage and result in stiffness degradation and a significant loss of structural integrity. Therefore, impact monitoring of aircraft composite structures is an important issue in the field of structural health monitoring. The impact of a structure is an instantaneous event so that it needs to be monitored on-line continuously during the whole service lifetime of the structure. Thus considering the strict restrictions of aerospace application, an impact monitoring system is required to be low weight, low power consumption and high reliability. In this paper, a Flexible-Integrated Impact monitoring System (FIIMS) with advantages of compactness, ultra-thin, light weight, low power consumption and high efficiency is developed to meet the strict requests of on-line application. Differently from conventional impact monitoring systems, the complex analog circuits are removed and the whole impact monitoring process is achieved in a digital way by turning the output of the PZT sensors directly into digital sequences through a two-level mechanism which is realized by combing diode array with a Field Programmable Gate Array (FPGA). A simple but efficient impact-region localization method is implemented in the FPGA. In addition, the FIIMS is realized in a flexible way so that it can be embedded onto the composite structure to be a mechatronic system to realize impact monitoring on-line continuously. To illustrate the capability of the FIIMS, it is integrated with a flexible PZT sensor array to construct a large-scale impact monitoring network. The network is embedded onto the surface of a large-scale carbon fiber reinforced plate with stiffeners by using a co-curing process and the impact monitoring ability of the FIIMS is validated. © 2018 ***. All rights reserved.

关键词： Structure (composition)

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