Mechanics Research Communications最新文献_第4页

Bandgap structure of tensegrity mass–spring chains equipped with internal resonators 配备内部谐振器的张力质量弹簧链的带隙结构

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-04-13 DOI: 10.1016/j.mechrescom.2024.104273

Luca Placidi , Julia de Castro Motta , Fernando Fraternali

{"title":"Bandgap structure of tensegrity mass–spring chains equipped with internal resonators","authors":"Luca Placidi , Julia de Castro Motta , Fernando Fraternali","doi":"10.1016/j.mechrescom.2024.104273","DOIUrl":"https://doi.org/10.1016/j.mechrescom.2024.104273","url":null,"abstract":"<div><p>This work studies the dispersion relation of a Maxwell type mass–spring chain formed by lumped masses and the parallel arrangement of two different types of tensegrity prisms. Use is made of the Bloch–Floquet theory of discrete systems in association with a linearized model of the response of the tensegrity units under compression loading. Such a modeling is aimed at studying the propagation of compression waves under small perturbations of the initial equilibrium state of the system. For a given value of the cable’s prestress, the tensegrity systems connecting the lumped masses react as elastic springs, which exhibit axial deformations accompanied by relative twisting rotations of the terminal bases. The twisting motion of the chain affects the expression of the kinetic energy, and is accounted for by introducing a suitable definition of equivalent masses. The bandgap structure of the analyzed system is analytically determined and numerical results are obtained for a chain formed by physical models tensegrity <span><math><mrow><mi>θ</mi><mo>=</mo><mn>1</mn></mrow></math></span> prisms aligned in parallel with minimal tensegrity prisms. The given results highlight the highly tunable frequency bandgap properties of tensegrity mass–spring chains exhibiting internal resonance capabilities.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140555657","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

Analysis of a tensegrity camber morphing airfoil 张弦外倾变形机翼分析

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-04-10 DOI: 10.1016/j.mechrescom.2024.104272

Heping Liu, Jian Song, Ani Luo

引用次数: 0

Discontinuity waves in temperature and diffusion models 温度和扩散模型中的不连续波

IF 2.4 4区工程技术

Mechanics Research Communications Pub Date : 2024-04-08 DOI: 10.1016/j.mechrescom.2024.104274

Michele Ciarletta , Brian Straughan , Vincenzo Tibullo

引用次数: 0

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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, Weijian Zhou, Yue-Sheng Wang, Weiqiu Chen

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