Mechanics Research Communications最新文献_第8页

Motion behavior of a 30-strut locomotive tensegrity robot 30 支杆机车张力结构机器人的运动行为

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-04-05 DOI: 10.1016/j.mechrescom.2024.104270

Meijia Wang , Yafeng Wang , Ruhe Mei , Zhaojun Liu , Xian Xu

{"title":"Motion behavior of a 30-strut locomotive tensegrity robot","authors":"Meijia Wang , Yafeng Wang , Ruhe Mei , Zhaojun Liu , Xian Xu","doi":"10.1016/j.mechrescom.2024.104270","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2024.104270","url":null,"abstract":"<div><p>Tensegrity structure is a prestressed self-equilibrated system consisting of compressed struts and tensioned tendons. The shape and position of tensegrity can be actively controlled by changing the lengths of members, making it attractive as a platform for adaptive bionic and locomotive robots. In this paper, the regular 30-strut tensegrity is used as the skeleton of a locomotive robot. The robot is flexible and highly redundant, making it adaptive to unconstrained environments and ideal for various co-robotic scenarios such as space exploration, emergency rescue, and so on. Compared with the 6-strut tensegrity robot, the 30-strut tensegrity robot with more controllable degrees of freedom possesses more various motion behaviors as well as gait primitives. To demonstrate the effectiveness of the motion behaviors of the 30-strut locomotive robot, we analyze the diverse collection of behaviors generated by actively changing the lengths of struts. It is found that rolling motion is robust and easy to be actuated, and multi-gait and individual-gait of rolling motion are observed. However, its high dimensionality and strong dynamic nature complicate the motion control. A physical prototype is manufactured to verify the found motion behaviors. The results show the potential uses of 30-strut tensegrity as multifunctional locomotive robots.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"137 ","pages":"Article 104270"},"PeriodicalIF":2.4,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140535468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical definitions of connectivity, incidence and node matrices for t-struts tensegrity prisms t-struts 张弦棱柱体连通性、入射和节点矩阵的分析定义

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-30 DOI: 10.1016/j.mechrescom.2024.104271

Victor A.S.M. Paiva , Paulo R.G. Kurka , Jaime H. Izuka

引用次数: 0

Active elastic metamaterials with equidistant solely resonant bandgaps 具有等距唯一谐振带隙的有源弹性超材料

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-19 DOI: 10.1016/j.mechrescom.2024.104269

Hasan B. Al Ba’ba’a

{"title":"Active elastic metamaterials with equidistant solely resonant bandgaps","authors":"Hasan B. Al Ba’ba’a","doi":"10.1016/j.mechrescom.2024.104269","DOIUrl":"10.1016/j.mechrescom.2024.104269","url":null,"abstract":"<div><p>Elastic metamaterials are man-made structures with properties that transcend naturally occurring materials. One predominant feature of elastic metamaterials is locally resonant bandgaps, i.e., frequency ranges at which wave propagation is blocked. Locally resonant bandgaps appear at relatively low frequency and arise from the existence of periodically placed mechanical local resonators. Typically, elastic metamaterials exhibit both locally resonant and Bragg-scattering bandgaps, which can generally be different in width and frequency ranges. This paper proposes two designs of active elastic metamaterials that only exhibit locally resonant bandgaps, which are infinite in number, evenly spaced in the frequency spectrum, and identical in width. The mathematical model is established using the transfer matrix method and synthesis of locally resonant bandgaps is achieved via an active elastic support with carefully designed frequency-dependent stiffness. A single unit cell of each proposed metamaterials is thoroughly studied, and its dispersion relation is derived analytically, along with the periodically repeating bandgap limits and widths. Following the dispersion analysis and bandgap parametric studies, finite arrays of the proposed metamaterials are considered, and their frequency response is calculated to verify the analytical predictions from dispersion analyses.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"137 ","pages":"Article 104269"},"PeriodicalIF":2.4,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140182402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evidence of nonlinearity tailoring in static and dynamic responses of honeycomb and auxetic hourglass lattice metastructures 蜂巢和辅助沙漏晶格转移结构静态和动态响应中的非线性裁剪证据

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-14 DOI: 10.1016/j.mechrescom.2024.104261

Vivek Gupta , Sondipon Adhikari , Bishakh Bhattacharya

{"title":"Evidence of nonlinearity tailoring in static and dynamic responses of honeycomb and auxetic hourglass lattice metastructures","authors":"Vivek Gupta , Sondipon Adhikari , Bishakh Bhattacharya","doi":"10.1016/j.mechrescom.2024.104261","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2024.104261","url":null,"abstract":"<div><p>Nature’s morphology and optimal energetic solutions remain the key motivation for designing cellular-based lattice structures. Understanding the nonlinear dynamical behaviors that arise from different lattice topologies of such structures in the metastructure framework is crucial for their successful implementation in various novel designs and technologies related to vibration and shape control. This paper presents a study of the static and dynamic response of auxetic and honeycomb lattices with hourglass or dome-shaped metastructures. The potential tailoring of nonlinearity of such responses through various design parameters that play a vital role in shaping the dynamic properties of such structures is discussed here. The impact of cell design parameters on the resulting macroscopic behavior is assessed using both numerical simulations and experimental studies. The transition from softening to hardening nonlinear dynamic responses is reported with cell topologies ranging from the regular honeycomb to auxetic topologies that are widely used as fundamental cells of cellular materials design. The experimental study is based on the time responses measured to verify the numerical predictions. The experimental system consists of different 3D printed hourglass samples based on the auxetic and honeycomb lattices on which dynamic testing using a laser Doppler vibrometer is performed. The design strategies proposed in this paper can be integrated into a wide range of lattice-based materials for noise and vibration control applications and biomedical devices.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"137 ","pages":"Article 104261"},"PeriodicalIF":2.4,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140145450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A brief review of solitary waves in nonlinear metamaterials 非线性超材料中的孤波简评

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-03 DOI: 10.1016/j.mechrescom.2024.104260

Nan Gao , Tianxue Ma , Yize Wang , Weijian Zhou , Yue-Sheng Wang , Weiqiu Chen

引用次数: 0

Form-finding for tensegrity structures based on the equilibrium equation 基于平衡方程的张拉整体结构的形式求解

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-01 DOI: 10.1016/j.mechrescom.2024.104256

Ziying Cao, Ani Luo, Yaming Feng, Heping Liu

引用次数: 0

An implicit computational approach in strain-gradient brittle fracture analysis 应变梯度脆性断裂分析中的隐式计算方法

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-01 DOI: 10.1016/j.mechrescom.2024.104259

Salvatore Sessa , Emilio Barchiesi , Luca Placidi

引用次数: 0

Preface: Special issue in origami engineering and physics 前言：折纸工程与物理学》特刊

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-03-01 DOI: 10.1016/j.mechrescom.2024.104258

Edwin A. Peraza Hernandez, Glaucio H. Paulino

引用次数: 0

Modelling and analysis of a novel E-shape piezoelectric vibration energy harvester with dynamic magnifier 带动态放大器的新型 E 形压电振动能量收集器的建模与分析

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-02-20 DOI: 10.1016/j.mechrescom.2024.104257

Yongyong Cao , Yuqiao Zheng , Xutao Mei , Fugang Dong , Rong Xu , Chenglong Shi , Pengcheng Zhang , Kongyuan Wei , Yabing Li

{"title":"Modelling and analysis of a novel E-shape piezoelectric vibration energy harvester with dynamic magnifier","authors":"Yongyong Cao , Yuqiao Zheng , Xutao Mei , Fugang Dong , Rong Xu , Chenglong Shi , Pengcheng Zhang , Kongyuan Wei , Yabing Li","doi":"10.1016/j.mechrescom.2024.104257","DOIUrl":"10.1016/j.mechrescom.2024.104257","url":null,"abstract":"<div><p>An important issue in conventional harvesters is that the output performance is limited to small strains and narrow bandwidth. To address these issues, a novel E-shape harvester with dynamic magnifier is devised to magnify the base vibration and enhance electric energy in low-frequency complicated environment. In this study, a novel electromechanical coupling dynamic model is established by considering the characteristics of the E-shape structure. Meanwhile, the analytical expressions of the eigenfunction and resonance frequency of the developed model are presented. The effect of system parameters on the power output are investigated and discussed. Results indicate that the electric energy can be significantly enhanced and the vibration amplitude can be magnified using properly design structural parameters. The proposed harvester with dynamic magnifier is a simple and effective approach for enhancing energy harvesting near a target operating frequency.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"137 ","pages":"Article 104257"},"PeriodicalIF":2.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variational study of a Maxwell–Rayleigh-type finite length model for the preliminary design of a tensegrity chain with a tunable band gap Maxwell-Rayleigh 型有限长度模型的变量研究，用于带隙可调的张力合成链的初步设计

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-02-05 DOI: 10.1016/j.mechrescom.2024.104255

Luca Placidi , Fabio Di Girolamo , Roberto Fedele

{"title":"Variational study of a Maxwell–Rayleigh-type finite length model for the preliminary design of a tensegrity chain with a tunable band gap","authors":"Luca Placidi , Fabio Di Girolamo , Roberto Fedele","doi":"10.1016/j.mechrescom.2024.104255","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2024.104255","url":null,"abstract":"<div><p>In this study, a Maxwell–Rayleigh-type model is investigated, describing a unidimensional lattice with a finite length, where the unit cell includes hosting and resonant masses mutually connected by elastic springs. The configuration selected is inspired by the specific engineering design to be discussed: however, the theoretical approach pursued is rather general and can be easily generalized to different scenarios. By the heuristic homogenization based on a Piola’s Ansatz, an equivalent continuum is specified: through a variational approach, resting on the minimization of the Hamilton’s action functional, a dispersion relation is deduced, revealing the existence of a band gap. Such a continuous interval of frequencies, inside which the propagation of waves is inhibited, can be tuned controlling the features of the original system. Thereafter, exploiting the same equations, the stationary elasto-dynamic response for a chain with a finite length is also deduced, corresponding to standing waves. On the basis of such results, the preliminary design of a linear chain with a finite number of cells is carried out. By the present strategy proper boundary conditions are deduced to be prescribed at the ends of the 1D lattice sample, and not over the unit cell (as it occurs in Bloch–Floquet approach with periodicity conditions). To realize the mutual elastic connections between unequal masses fitting the problem constraints, tensegrity prisms are selected, including compressed bars and tensioned cables, for which it is possible to govern the tangent axial stiffness through the cable pre-tensioning. We analyze the scenario in which the band gap coincides with the interval <span><math><mrow><mn>1</mn><mo>−</mo><mn>10</mn><mspace></mspace><mi>Hz</mi></mrow></math></span>, indicating an appropriate geometry and suitable engineering materials for the tensegrity elements.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"136 ","pages":"Article 104255"},"PeriodicalIF":2.4,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139743301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0