Publisher Correction: Universal elastic mechanism for stinger design

Abstract In this paper, synthesis of an arbitrary elastic behavior with an elastic mechanism is addressed. The mechanisms considered are parallel and serial mechanisms with concurrent axes. We show that any stiffness matrix can be realized through a parallel mechanism with all spring axes intersecting at a unique point. This point is shown to be the center of stiffness. We also show that any compliance matrix can be realized through a serial mechanism with all joint axes intersecting at a unique point. This point is shown to be the center of compliance. Synthesis procedures for mechanisms with these properties are provided.

Download Full-text

Spatial Compliances Achieved With Serial Elastic Mechanisms

10.1115/imece2000-2392 ◽

2000 ◽

Author(s):

Shuguang Huang ◽

Joseph M. Schimmels

Keyword(s):

Rotational Motion ◽

Stiffness Matrix ◽

Parallel Mechanism ◽

Elastic System ◽

Compliance Matrix ◽

Elastic Joint ◽

Compliant Behavior ◽

Elastic Mechanism ◽

Spatial Compliance ◽

Serial Mechanism

Abstract Previously, the structure of a spatial stiffness matrix and its realization using a parallel elastic system have been addressed. This paper extends those results to the analysis and realization of a spatial compliance matrix using a serial mechanism. We show that, a spatial compliance matrix can be decomposed into a set of rank-1 primitive matrices, each of which can be realized with an elastic joint in a serial mechanism. To realize a general spatial compliance, the serial mechanism must contain joints that couple the translational and rotational motion along/about an axis. The structure of a spatial compliance matrix can be uniquely interpreted by a 6-joint serial elastic mechanism whose geometry is obtained from the eigenscrew decomposition of the compliance matrix. The results obtained from the analysis of spatial compliant behavior and its realization in a serial mechanism are compared with those obtained for spatial stiffness behavior and its realization in a parallel mechanism.

Download Full-text

The Power of Mantis Shrimp Strikes: Interdisciplinary Impacts of an Extreme Cascade of Energy Release

Integrative and Comparative Biology ◽

10.1093/icb/icz127 ◽

2019 ◽

Vol 59 (6) ◽

pp. 1573-1585 ◽

Cited By ~ 4

Author(s):

S N Patek

Keyword(s):

Fluid Dynamics ◽

Muscle Contraction ◽

Energy Release ◽

Energy Flow ◽

Evolutionary Dynamics ◽

Materials Science ◽

Impact Fracture ◽

Mantis Shrimp ◽

Elastic Mechanism ◽

Flow Through

Abstract In the course of a single raptorial strike by a mantis shrimp (Stomatopoda), the stages of energy release span six to seven orders of magnitude of duration. To achieve their mechanical feats of striking at the outer limits of speeds, accelerations, and impacts among organisms, they use a mechanism that exemplifies a cascade of energy release—beginning with a slow and forceful, spring-loading muscle contraction that lasts for hundreds of milliseconds and ending with implosions of cavitation bubbles that occur in nanoseconds. Mantis shrimp use an elastic mechanism built of exoskeleton and controlled with a latching mechanism. Inspired by both their mechanical capabilities and evolutionary diversity, research on mantis shrimp strikes has provided interdisciplinary and fundamental insights to the fields of elastic mechanisms, fluid dynamics, evolutionary dynamics, contest dynamics, the physics of fast, small systems, and the rapidly-expanding field of bioinspired materials science. Even with these myriad connections, numerous discoveries await, especially in the arena of energy flow through materials actuating and controlling fast, impact fracture resistant systems.

Download Full-text

Synthesis of an elastic mechanism

Mechanism and Machine Theory ◽

10.1016/0094-114x(88)90023-7 ◽

1988 ◽

Vol 23 (4) ◽

pp. 305-312 ◽

Cited By ~ 5

Author(s):

Anjani Kishore ◽

Michael Keefe

Keyword(s):

Elastic Mechanism

Download Full-text

Dynamic analysis of planar elastic mechanisms using the dyad method

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1243/146441903763049397 ◽

2003 ◽

Vol 217 (1) ◽

pp. 1-14 ◽

Cited By ~ 2

Author(s):

L Romdhane ◽

H Dhuibi ◽

H Bel Hadj Salah

Keyword(s):

Class Ii ◽

Graph Representation ◽

Elastic Mechanism ◽

Complete Automation ◽

Newton Raphson ◽

Set Up ◽

Dyad Analysis ◽

Planar Linkages ◽

Raphson Method ◽

Good Agreement

Based on graph representation of planar linkages, a new algorithm has been developed to identify the different dyads of a mechanism. A dyad, or class II group, is composed of two binary links connected by either a revolute (1) or a slider (0) pair, with provision for attachment of other links by lower pair connectors located at the end of each link. There are five types of dyad: D111, D101, D011, D001 and D010. The dyad analysis of a mechanism is predicated on the ability to construct the system from one or more of the five binary structure groups or class II groups. If the mechanism is complicated and several dyads are involved, the task of identifying these dyads, by inspection, can be difficult and time consuming for the user. This algorithm allows complete automation of this task. It is based on Dijkstra's algorithm for finding the shortest path in a graph. When compared with algorithmic methods, such as the Newton-Raphson method, the dyad method proved to be a very efficient one and requires as little as one-tenth of the time needed by the method using the Newton-Raphson algorithm. The second part of this work presents an extension of the dyad method to non-rigid or elastic mechanisms. Here also, this method is predicated on the ability to subdivide the elastic mechanism into elastic dyads. The solution for each type of elastic dyad is derived and can be applied to each dyad in the mechanism. Therefore, a solution of the complete elastic mechanism is possible when the mechanism is made of dyads only. This method makes a powerful and simple tool for analysing complex elastic mechanisms. Moreover, the complexity of the model does not increase as the mechanism becomes more complex. The D111 dyad is taken as an example to demonstrate this method. A finite element (FE) analysis was made for this type of dyad, and an experimental set-up was built to validate the analysis. The dyad-FE results were in good agreement with the experimental ones.

Download Full-text

Intermittent locomotion of a fish-like swimmer driven by passive elastic mechanism

Bioinspiration & Biomimetics ◽

10.1088/1748-3190/aad419 ◽

2018 ◽

Vol 13 (5) ◽

pp. 056011 ◽

Cited By ~ 5

Author(s):

Longzhen Dai ◽

Guowei He ◽

Xiang Zhang ◽

Xing Zhang

Keyword(s):

Elastic Mechanism

Download Full-text

Experimentally Determined Dynamic Strains in an Elastic Mechanism

Journal of Engineering for Industry ◽

10.1115/1.3438679 ◽

1975 ◽

Vol 97 (3) ◽

pp. 791-794 ◽

Cited By ~ 8

Author(s):

R. M. Alexander ◽

K. L. Lawrence

Keyword(s):

Frequency Response ◽

Cyclic Strain ◽

Strain Variation ◽

Response Data ◽

Elastic Mechanism ◽

Dynamic Bending ◽

Dynamic Strains

Measured dynamic bending strains in the links of a model four bar mechanism are presented. Cyclic strain variation and frequency response data are given, and comparison is made between calculated and measured values for one of the mechanism configurations.

Download Full-text

Ultrasonic attenuation in Niobium Oxide(NbO) due to phonon-phonon interaction

Anusandhaan - Vigyaan Shodh Patrika ◽

10.22445/avsp.v4i1.4375 ◽

2016 ◽

Vol 4 (1) ◽

Author(s):

Arvind Kumar Tiwari

Keyword(s):

Elastic Properties ◽

Elastic Constants ◽

Niobium Oxide ◽

Ultrasonic Attenuation ◽

Phonon Interaction ◽

Third Order ◽

Temperature Range ◽

Third Order Elastic Constants ◽

Elastic Mechanism ◽

Elastic Loss

Ultrasonic attenuation due to phonon-phonon interaction and thermo elastic mechanism have been evaluated in NbO along (110) direction in the temperature range 100-500K. The second and third order elastic constants are also evaluated for the evaluation of ultrasonic attenuation and other associated parameters. The ultrasonic attenuation due to phonon-phonon interaction is predominant over thermo elastic loss in this material. The results are discussed in correlation with thermo elastic properties of NbO.

Download Full-text

Vibration analysis of nonlinear and linear elastic systems

Herald of Dagestan State Technical University Technical Sciences ◽

10.21822/2073-6185-2020-47-4-141-150 ◽

2021 ◽

Vol 47 (4) ◽

pp. 141-150

Author(s):

A. S. Lichkovakha ◽

B. A. Shemshura ◽

S. A. Kuznetsov

Keyword(s):

Elastic System ◽

Elastic Characteristic ◽

Progressive Change ◽

Vehicle Suspensions ◽

Linear Elastic ◽

Eccentric Compression ◽

Elastic Systems ◽

Elastic Mechanism ◽

High Flexibility ◽

Elastic Elements

Objective. In this study, the task is to establish the theoretical prerequisites for the operability of a regressive-progressive elastic mechanism by comparing the amplitude-frequency characteristics and phase trajectories with a linear elastic system of comparable stiffness in a static equilibrium position.Methods. The article presents a comparative dynamic analysis of vibrations of elastic systems with linear rigidity and regressive-progressive characteristics obtained as a result of the use of elastic elements in the form of high flexibility rods with longitudinal eccentric compression. Such elastic elements in various design variants have been tested and patented as damping elements for use in the construction of vibration dampers for construction structures and vehicle suspensions, and have experimentally shown their effectiveness in damping vibrations.Results. The regressiveprogressive elastic characteristic obtained by the elliptic parameters method and using the ANSIS calculation complex is used in the dynamics equations in an approximated form, which expands the capabilities of the method. It is shown that increasing the energy intensity of a curvilinear system reduces the vibration amplitude.Conclusion. The regressive-progressive change of the stiffness of curvilinear elastic systems can be achieved using an elastic element with eccentric longitudinal compression; the regression plot of elastic properties is achieved due to eccentric compression; the progressive plot – through the use of a guide or other design solutions. The implementation of this characteristic allows using such elastic mechanisms in systems where the accumulation of potential energy occurs with a smaller compression stroke for the same perturbation than for linear systems.

Download Full-text