Auxetic metamaterials are architected structures that possess a unique property known as negative Poisson's ratio. This remarkable characteristic enables them to expand or contract in direction perpendicular stretch compression. Due their exceptional attributes such energy absorption and fracture resistance, these auxetic hold great promise for various applications across multiple domains. However, the widespread development of materials has been hindered by absence an efficient design...

The combination of static balancing and tensegrity structures has resulted in a new class mechanisms: Statically Balanced Tensegrity Mechanisms. These are prestressed that equilibrium wide range positions, thus exhibit mechanism-like properties. This paper describes the design prototype model statically balanced mechanism based on classic structure.

Generally, adjustment of gravity equilibrators to a new payload requires energy, e.g., increase the preload balancing spring. A novel way energy-free is possible by introducing concept storage The spring supplies or stores energy necessary adjust balancer equilibrator. In essence, mechanism maintains constant potential within mechanism; exchanged between and when needed. Various conceptual designs using both zero-free-length springs regular extension are proposed. Two models were...

Rigid-body mechanisms (RBMs) and compliant (CMs) are traditionally treated in significantly different ways. In this paper, we present a synthesis approach that is appropriate for both RBMs CMs. approach, CMs generalized into modularized consist of five basic modules, including links (CLs), rigid (RLs), pin joints (PJs), (CJs), (RJs). The link modules joint modeled through beam elements hinge elements, respectively, geometrically nonlinear finite-element solver, subsequently beam-hinge ground...

The major disadvantage of existing dynamic balancing principles is that a considerable amount mass and inertia added to the system. objectives this article are summarize, compare, evaluate complete regarding addition introduce normalized indicator judge performance inertia. obtained from survey literature applied double pendulum for comparison, both analytically numerically. results show duplicate mechanisms principle has least also low most advantageous low-mass low-inertia if available...

This article describes the development of a mobile arm support for people with muscular diseases.The is spring-balanced, special attention on reduction operating effort (high balancing quality and low friction), functionality (large range motion), aesthetics (inconspicuous design).The spring settings can be adjusted wearing heavier clothing or picking up an object, function that also used moving down.The device levels itself automatically to compensate uneven floors, overruled assist...

Compliant mechanisms are rapidly gaining importance, yet their design remains challenging. A great variety of methods being developed as it is reported in a growing stream publications. However, so far no review this body literature available. This paper provides comprehensive and conceptual overview the main notions behind most relevant for compliant mechanisms. Rigid-Body-Replacement including Pseudo-Rigid-Body model FACT approach covered, well Building Block approaches. In addition an...

Shaking forces and shaking moments in high-speed parallel manipulators are a significant cause of base vibrations. These vibrations can be eliminated by designing the manipulator to shaking-force balanced shaking-moment balanced. In this article an approach for design evaluation dynamically is presented applied comparative experimental investigation unbalanced DUAL-V planar 4-RRR manipulator. For precise simulation motion, inverse dynamic model derived validated. Experiments show that has up...

Persons suffering from progressive muscular weakness, like those with Duchenne dystrophy (DMD), gradually lose the ability to stand, walk and use their arms. This hinders them performing daily activities, social participation being independent. Wheelchairs are used overcome loss of walking. However, there currently few efficient functional substitutes support Arm supports or robotic arms can be mounted wheelchairs aid in arm motion, but they quite visible (stigmatizing), limited...

In this letter we demonstrate a pneumatic bending actuator for upper-limb assistive wearable robots which uses thin McKibben muscles in combination with flexure strip. The features both active soft actuation and passive gravity support, terms of force transmission bridges the gap between classic rigid type actuators emerging technologies. Its strip leverages high-force low-displacement properties towards large rotational range motion reduces localized forces at attachments. We explain...

The ability of underactuated hands to grasp small objects is very limited, because the precision normally unstable. goal this paper achieve stable grasps by means simple design modifications distal phalanges fingers. These comprise curving contact area phalanx, application a mechanical limit prevent hyperextension and compliant joint between proximal phalanges. A model developed calculate limits finger dimensions in order for different object sizes. An experimental setup used test stability...