Lumped element models, also known as, mass-spring-damper models, are widely used to simulate deformable objects because of their simplicity and computational efficiency. However, the parameters of lumped element models are typically determined in an ad hoc fashion through trial-and-error, as these models are not directly based on continuum mechanics of deformable objects. In this paper, an alte...

The vibration of robot joint reducer is the main factor that causes vibration or motion error of robot system. To improve the dynamic precision of robot system, the cycloid ball transmission used in robot joint is selected as study object in this paper. An efficient dynamic modelling method is presented-lumped stiffness method. Based on lumped stiffness method, a translational-torsional couplin...

Nowadays, physical models of head used in pedestrian head impact standard tests are not accurate enough to represent the human head behavior and to assess the head injury risk in case of impact in a realistic way. In order to remove this technological barrier, the Strasbourg University Finite Elements Head Model (SUFEHM) is used in conjunction with a lumped model of the impact point at bonnet l...

Abstract In motorcycle dynamics, great importance is attributed to the study of weave and wobble vibration modes and, in particular, effects flexibility structural components on their stability. Therefore, appropriate models for studying should include flexible elements describing flexural behavior such as main frame, front assembly, rear swingarm. Different approaches are possible modeling fle...

Title: Acoustic analysis of primate air sacs and their effect on vocalization. Abstract: This paper presents an analysis of the acoustic impedance of primate air sacs and their interaction with the vocal tract. A lumped element model is derived and it is found that the inertance of the neck and the volume of the air sac are relevant, as well as the mass and stiffness of the walls (depending on ...

Composites with negative stiffness inclusions in a viscoelastic matrix are shown to have higher stiffness and mechanical damping tandelta than that of either constituent and exceeding conventional bounds. The causal mechanism is a greater deformation in and near the inclusions than the composite as a whole. Though a block of negative stiffness is unstable, negative stiffness inclusions in a com...

A technique for real-time simulation of hoisting cable systems based on a multibody nonideal constraint is presented. The hoisting cable constraint is derived from the cable internal energies for stretching and twisting. Each hoisting cable introduces two constraint equations, one for stretching and one for torsion, which include all the rigid bodies attached by the same cable. The computation ...

Integration of a tactile display onto the end effector of a robot allows free-hand exploration of an encountered-type environment that provides both kinesthetic and cutaneous feedback. A novel tactile display approach, called Haptic Jamming, uses a combination of particle jamming and pneumatics to control the stiffness and shape of a surface. The tactile display mounts to the cable-driven platf...

When an elastic object is pressed, we expect it to resist by exerting a restoring force. A reversal of this force corresponds to negative stiffness. If we combine elements with positive and negative stiffness in a composite, it is possible to achieve stiffness greater than ~or less than! that of any of the constituents. This behavior violates established bounds that tacitly assume that each pha...

A theoretical framework is presented for the estimation of the physical parameters of a structure (i.e., mass, stiffness, and damping) from measured experimental data (i.e., input–output or output-only data). The framework considers two state-space models: a physics-based model derived from first principles (i.e., white-box model) and a data-driven mathematical model derived by subspace system ...