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A quasi-zero-stiffness metastructure for concurrent low-frequency vibration attenuation and energy harvesting

Thin-Walled Structures 2025年 214卷

作者： Shu, Yaoqiang Wang, Kai Chen, Tingting Pan, Hongbing Deng, Yiping Yin, Hanfeng Zhou, Jiaxi College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Hunan Changsha410082 China

Metastructures have been extensively studied for vibration attenuation, wave manipulation, and energy conversion. However, achieving simultaneous vibration attenuation and energy harvesting in low-frequency and ultra-low-frequency regimes remains challenging due to limitations in conventional designs. This study proposes a novel dual-functional quasi-zero-stiffness (QZS) metastructure that integrates low-frequency bandgap generation and piezoelectric energy conversion using polyvinylidene fluoride (PVDF) films. The metastructure is optimized for low-frequency, low- amplitude conditions typical in engineering applications. A nonlinear electromechanical coupling model is developed to describe its dynamic and electrical behaviors, with governing equations solved numerically using the fourth-order Runge-Kutta method and validated via finite element simulations. Parametric studies investigate the influence of key design parameters on vibration attenuation and energy harvesting performance. Results demonstrate that the QZS metastructure effectively suppresses low-frequency vibrations while achieving efficient energy conversion, leveraging its unique combination of bandgap formation and piezoelectric mechanisms. This work provides valuable insights into the development of advanced metastructures for low-frequency vibration control and energy harvesting in practical applications. © 2025 Elsevier Ltd

关键词： Runge Kutta methods

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Nonlinear multi-point impacts of the bi-stable functional gradient magneto-electro-elastic plate: Interaction analysis and active control strategy based on bistable configuration

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Communications in Nonlinear Science and Numerical simulation 2025年 148卷

作者： Li, Lizhi Ren, Yiru Nie, Lu State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Hunan Changsha410082 China College of Mechanical and Vehicle Engineering Hunan University Hunan Changsha410082 China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Hunan Changsha410082 China China Academy of Aerospace Science and Innovation Beijing 100086 China

Revealing the coupling correlations between stiffness nonlinearity and magneto-electro-mechanical effect in multi-point impacts contributes significantly to the advancement of intelligent morphing structures. Multi-point impact responses and active control of bi-stable functional gradient magneto-electro-elastic (FG-MEE) plates are investigated, focusing on influence mechanism of the active control performance and the bi-stable characteristics. Based on the Reddy high-order shear plate theory model, the nonlinear geometric relationship considering the bi-stable configuration is established, and the multi-point impact model is extended. To achieve efficient structural design in multi-point impacts, the active control strategy in multi-physics fields is introduced. In the multi-physical field, the nonlinear dynamic model for multi-point impact involving the bi-stable functionally graded magneto-electro-elastic plate is established. The expanded two-step perturbation method is proposed to solve the bi-stable configuration driven by the magneto-electro-mechanical effect. To obtain the approximate solution for the multi-point impact of the bi-stable FG-MEE plate, the extended two-step perturbation method-Galerkin method is further developed to the higher-order form. Ultimately, coupling correlations between stiffness nonlinearity and magneto-electro-mechanical effect in the multi-point impacts are systematically revealed, and the active control performance is evaluated under the influence of multi-point impact. © 2025 Elsevier B.V.

关键词： Galerkin methods

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Mechanical properties of 3D printing novel bionic hierarchical cellular structure inspired by Raphia seed: Experimental, simulation and theoretical investigation

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Journal of Materials Research and Technology 2025年 36卷 6434-6450页

作者： Changran Li Xiangcheng Li Gang Yang Detao Wan Dean Hu Chunan Du School of Mechanical and Electrical Engineering Henan University of Technology Zhengzhou 450001 PR China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 PR China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha 410073 PR China

Cellular structure attracts much attention due to its excellent energy absorption capacity and lightweight. In this study, inspired by the Raphia seed, a 3D printing novel bionic hierarchical cellular structure with different order structure parameters is proposed. The effect of different order structure parameters on the mechanical properties of the bionic cellular structure are studied by compression experiments, numerical simulation and theoretical model. The results show that the mechanical properties of the bionic cellular structure have a linearly with the thickness of cell wall, but a non-monotonic relationship with the thickness of tube wall and the diameter of circular hole. Compared with other typical cellular materials, the bionic cellular structure exhibits superior energy-absorbing performance. Besides, the deformation modes of the bionic cellular structure are dominated by order structure parameters, and there are “horizontal”, inclined shear mode and “V” shear deformation modes. The distribution of strain field is closely related to mechanical properties and deformation modes of the bionic cellular structure. At last, the semi-empirical theoretical models of SEA, relative elastic modulus and relative platform stress of the bionic cellular structure are established. This study provides a good option for improving the load-bearing capacity and energy absorption performance of lightweight cellular structures.

关键词： Hierarchical cellular structure Bionic Order structure parameters Deformation behavior Energy absorption

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Additive manufacturing process related mechanical performance of cobalt-chromium-molybdenum alloy: In-situ X-ray computed tomography study

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Materials Science and Engineering: A 2025年 935卷

作者： Zhou, Junhan Huang, Rongzheng Yang, Qidong Zhou, Ye Xie, Meiming Xie, Haiqiong Cai, Xu Wei, Kai Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Changsha China Orthopedic Trauma Center General Hospital of Western Theater Command of PLA Chengdu China School of Advanced Manufacturing Engineering Chongqing University of Posts and Telecommunications Chongqing China Chongqing Institute of Bio-Intelligent Manufacturing Chongqing China Department of Spinal Surgery Hunan Xiangya Boai Rehabilitation Hospital Changsha China

Laser powder bed fusion (PBF-LB) shows significant potential in additively manufacturing personalized CoCrMo alloy orthopedic implants. However, the characteristics of microstructures and defects, and especially their influence on the mechanical performance of PBF-LB processed CoCrMo alloy remain underexplored. Here, CoCrMo alloy is additively manufactured, and we first employ an in-situ X-ray computed tomography (XCT) tensile test to investigate the exclusive microstructures and defects and their influence mechanism on mechanical properties. Adequate laser energy density (Ev = 106.67–152.38 J/mm3) reduces defect number and increases sphericity, improving manufacturing quality, while insufficient or excessive energy input leads to LOF or keyhole defects, respectively. Besides, by first conducting the in-situ XCT tensile tests, we originally 3D visually reveal that the underlying failure mechanism is the defect growth and coalescence, which lead to the crack initiation and eventual brittle fracture. At Ev = 152.38 J/mm3, the alloy exhibits the best mechanical performance (tensile strength: 1193.41 MPa, elongation: 4.99 %), with fracture behavior governed by intrinsic microstructural characteristics. The PBF-LB processed CoCrMo alloy exhibits even higher ultimate strength and comparable elongation than the conventionally casted ones. Moreover, the heat treatment enables the recrystallization and precipitate formation, significantly improving the elongation of the PBF-LB processed CoCrMo alloy to 26.65 % at Ev = 266.67 J/mm3, achieving a marvelous balance between strength and ductility. This study fills the gap in understanding the relationship between additive manufacturing, defect formation, and mechanical performance of CoCrMo alloy, establishing a basis for efficient manufacturing and superb mechanical performance for its biomedical applications. © 2025 Elsevier B.V.

关键词： Computerized tomography

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Research on dynamic path planning and synergistic following algorithms for a snake-arm system with flipping and feed motion

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Advances in Engineering Software 2025年 207卷

作者： Liu, Chang Wan, Detao Wang, Zhe Hu, Dean Li, Yang Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Changsha410082 China

There exists a snake-arm system that can operate in special confined spaces with narrow holes. The system consists of a flipping base and a snake-arm manipulator. It offers high flexibility but also presents great difficulties in solving inverse kinematics. In this paper, we propose a synergistic motion scheme for the snake-arm system to pass through small holes into confined spaces. Firstly, we present the kinematic model. Next, to guide the snake-arm manipulator smoothly into indoor spaces, we propose a dynamic path planning method. We divide the following path into three parts: obstacle avoidance path, feeding path, and transition path. Each part is planned individually, and a procedural method is used to combine them. Unlike traditional static paths, the feeding path and transition path can adaptively adjust as the snake-arm system moves. To ensure strict adherence to the dynamic path during follow-up motion, we propose a dynamic path synergistic following algorithm specifically designed for this type of system. Compared with existing algorithms that follow static paths, the new algorithm will not be constrained by the single feed direction of the snake-arm system. simulation tests verify the effectiveness of the algorithm, which achieves an endpoint positioning accuracy of 10⁻⁷ mm for the snake-arm manipulator. Additionally, it expands the workspace of the snake-arm system from 1.59 m³ (horizontal mode) to 7.19 m³, while reducing outdoor height occupation by 21.54 % compared to vertical motion. Finally, in comparative tests, the proposed algorithm excelled in computational efficiency, accuracy, and stability. © 2025

关键词： Inverse kinematics

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Investigation of mechanical and electrical characteristics of selfsensing pneumatic torsional actuators

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Science China(Technological Sciences) 2024年第1期67卷 130-142页

作者： XIAO Wei HU DeAn HU GuoLiang XIAO YiHua Key Laboratory of Conveyance and Equipment Ministry of EducationEast China Jiaotong UniversityNanchang 330013China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha 410082China

Soft pneumatic actuators are one of the most promising actuation for soft robots,and great achievements have been *** it remains challenging to endow sensing capabilities to pneumatic actuators,especially for the sensing ability originating directly from the actuator ***,a self-sensing pneumatic torsional actuator(SPTA)is designed based on the electromagnetic induction effect and magnetically responsive *** SPTA can generate feedback voltage and current with the deformation,in which the sensing function comes from its inherent *** investigate the mechanical and electrical characteristics,an experimental platform and a finite element model are established,*** find that the torsion angle and output torque increase in nonlinear with the actuating *** maximum torsion angle is 66.35°,which is 84.34%of that for the actuator fabricated by pure *** maximum output torque(24.9 N mm)improves by 23.19%compared with the actuator made by pure *** regards the electrical characteristics,the maximum feedback voltage and current are 2.90μV and 29.50 nA when the SPTA is actuated by a pressure of−40 *** also demonstrate that the relationship between the torsion angle and the magnetic flux change is approximately ***,the number of turns of wires,magnetic powders contents,and magnetic direction on the feedback voltage and current are *** show that the feedback voltage and current can be enhanced by increasing the number of turns and magnetic powders *** envision that the SPTA would be promising for soft robots to realize their accuracy control and intelligentization.

关键词： pneumatic torsional actuators self-sensing feedback voltage finite element modeling soft robots

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Structure design and Energy Absorption Mechanism of a New Type of Armor Inspired from Armadillos

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Acta Mechanica Solida Sinica 2021年第5期34卷 718-728页

作者： Chunan Du Gang Yang De’an Hu Xu Han Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha410082China School of Mechanical Engineering Hebei University of TechnologyTianjin300401China

Dermal armor,such as fish scales or armadillo osteoderms,has been known to exhibit high performance and good flexibility defending against *** top layer of the dermal armor usually consists of a segmented hard bony *** soft inner layer composed of collagen fibers connects and holds the hard *** by the dermal armor of armadillos,bioinspired protection armor is studied for impact *** hexagonal scales tessellate the surface continuously and work as the hard bony layer protecting the soft inner layer from ***-high molecular weight polyethylene(UHMWPE)is used as the connectivity layer to support and hold the *** investigate the dynamic response of the bioinspired protection armor,drop weight impact tests are carried out.A finite element model is established to study the dynamic response of bioinspired protection *** impact process images captured by a high speed camera and the experimental data of drop hammer acceleration tests verify the validity of the numerical *** dynamic resistance behavior and the synergy effect of each part of the bioinspired protection armor combined with the protected objects are studied in detail by numerical *** results show that the bioinspired protection armor has marked energy absorption ability.A synergistic dissipation mechanism is activated in the impact process,which can dissipate impact energy and make the impact load distribution more *** UHMWPE between the outer layer and the soft substrate plays a significant role not only related to support and connection,but also for the force balance and energy *** mechanism of energy absorption of the bioinspired protection armor revealed in this paper can be taken as a new guideline for designing a novel protective armor.

关键词： Bioinspired Armor Impact Energy absorption Numerical simulation

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Finite element analysis of biomechanical effects of oversized total talar prosthesis and collateral ligament reconstruction on total talar replacement

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Foot and Ankle Surgery 2025年

作者： Li, Hao Xie, Haitao Li, Yuanqiang Chen, Wan Xie, Haiqiong Cai, Xu Wei, Kai Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Changsha China XingGuo people's Hospital Jiangxi China School of Advanced Manufacturing Engineering Chongqing University of Posts and Telecommunications Chongqing China Chongqing Institute of Bio-Intelligent Manufacturing Chongqing China Sports Medicine Center First Affiliated Hospital of The Army Medical University Chongqing China Department of Orthopedics The Third Xiangya Hospital of Central South University Department of Spinal Surgery Hunan Xiangya Boai Rehabilitation Hospital Changsha China

Background: Total talar replacement (TTR) using a personalized customized total talar prosthesis (TTP) is an emerging and promising surgical option for the treatment of ankle problems. However, how to solve ankle instability after total talar replacement, and the influence of related solutions on foot biomechanics has not been investigated. Methods: Our preliminary studies have found that enlarging a personalized total talar prosthesis (TTP0) by 1.5 % along the coronal axis (TTP-FP1.5) and reconstructing the anterior talofibular ligament (ATFL) significantly can enhance ankle stability. However, there is a lack of insight into the effect of the two options on biomechanics. Consequently, this work constructed anatomically detailed finite element models of the foot, including an intact model and four surgical models, including replacement of TTP0, replacement of TTP-FP1.5, and two models of TTP-coupled ATFL reconstruction. Biomechanical differences were evaluated by numerical simulation of a balanced-standing and three characteristic instants of the stand phase. Results: Changes in plantar pressure distribution, joint contact pressure and force transmission, von Mises stress on bone, and prosthesis stress were predicted and analyzed. It was found that significant changes in foot biomechanics occurred after TTP-FP1.5 replacement compared to TTP0 replacement. In contrast, no ligament reconstruction versus ATFL reconstruction exerts a minor effect on biomechanics. Conclusion: The findings indicate that the shape of the prosthesis is the primary factor affecting foot biomechanics after total talar replacement. In contrast, reconstruction of the ATFL has only a minimal effect on the biomechanics of the foot. The above findings will provide a solid basis for the improvement of TTR surgical plans in clinical. © 2025 European Foot and Ankle Society

关键词： Ankle stability Biomechanics Finite element analysis Total talar replacement

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Tailoring orthotropic mechanical and thermal properties in nonlinear contact, vibration and thermal problems via kriging-based optimization

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Materials and design 2025年 254卷

作者： Zhou, Yicong Duan, Jinyan Mao, Guoxin Hong, Jun Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment of the Ministry of Education College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Key Laboratory of Education Ministry for Modern Design & Rotor-Bearing System School of Mechanical Engineering Xi'an Jiaotong University Xi'an710049 China

Customizing suitable material properties for specific applications is always fascinating but challenging for designers, especially for problems with strong nonlinearities. Efficient and universal methods for tailoring material properties to meet required performances in nonlinear scenarios are still needed. Here, a generalized two-stage adaptive optimization method for tailoring mechanical and thermal properties is proposed. Properties including Young's modulus, Poisson's ratio, shear modulus, yield behavior, thermal conductivity and thermal expansion factor are involved and considered orthotropic. Spearman correlation coefficient analysis is carried out in the first stage to identify properties sensitive to the performances of interest. Adaptive optimization that combines multi-objective genetic algorithm and Kriging response surface is followed, and values of these sensitive properties are determined. Applications of the proposed adaptive material properties tunning method to nonlinear contact, vibration and thermodynamics problems are presented, respectively. It turns out adjusting material properties can significantly improve the contact stress distribution of bolted structure, depress the vibration of rotor system, and reduce the thermal expansion deformation of chip. © 2025 The Authors

关键词： Thermal expansion

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Trajectory Tracking Control Strategy Based on Model-Free Adaptive Sliding Mode Control Approach for Robot Manipulator 7

Trajectory Tracking Control Strategy Based on Model-Free Ada...

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7th CAA International Conference on Vehicular Control and Intelligence, CVCI 2023

作者： Zhu, Suyu Li, Mingjun Hu, Dean Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Changsha China

ISBN: (纸本)9798350340488

This paper proposes the trajectory tracking control strategy based on the model-free adaptive sliding mode control (MFAC-SMC) approach for a robot manipulator. The MFAC-SMC controller is designed based on partial form dynamic linearization (PFDL), model-free adaptive control, and discrete sliding mode control methods. Afterwards, the stability of MFAC-SMC is proven, and its superiority in robotic arm trajectory tracking control is demonstrated by comparing it with other control methods. To improve the trajectory tracking performance of the robotic manipulator, the control strategy of MFAC-SMC controller parameters is explored, which provides possibilities to find the optimal parameter configuration combination under a given torque constraint. From parameter experiment results, the values of control system response, overshoot, and steady-state error are reduced with the increase of values of exponential reaching law coefficient, and the decrease of values of control input variation penalty factor, but the control input torque is raised. Finally, two cases are designed to verify the correctness of the parameter effect patterns. A cosine trajectory scenario is designed to demonstrate the optimal control strategy of parameters combination under a torque constraint and a quintic polynomial trajectory scenario is supplemented to verify the effectiveness of the parameter patterns in different scenarios. The results show that the proposed control strategy obtains the optimal trajectory tracking performances including the overshoot, rise time, and steady-state error. © 2023 IEEE.

关键词： MFAC-SMC method parameter effects PFDL trajectory tracking control

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