European journal of mechanical and environmental engineering 

About: European journal of mechanical and environmental engineering is an academic journal. The journal publishes majorly in the area(s): Finite element method & Robot. It has an ISSN identifier of 1371-6980. Over the lifetime, 121 publications have been published receiving 1083 citations.

Pneumatic artificial muscles: actuators for robotics and automation

Abstract: This article is intended as an introduction to and an overview of Pneumatic Artificial Muscles (PAMs). These are pneumatic actuators made mainly of a flexible and inflatable membrane. First, their concept and way of operation are explained. Next, the properties of these actuators are given, the most important of which are the compliant behavior and extremely low weight. A classification and review is following this section. Typical applications are dealt with in the last but one section and, finally, some concluding remarks are made.

Frequency domain direct parameter identification for modal analysis : state space formulation

Abstract: Using a state space formulation for the equations of motion for a mechanical structure, an algorithm is developed to identify its state transition matrix from measured multiple input/multiple output relations. From the identified matrix quantities, it is possible to derive a modal model of natural frequencies, damping values, mode shapes and modal participation factors

Physical characterization of nonlinear shock absorber dynamics

Abstract: Un modele physique de soupapes avec 10 parametres est presente pour simuler le comportement non-lineaire, dynamique et fonction de la temperature pour des amortisseurs de voitures. La dependance de la temperature est due a la viscosite de l'huile qui est fonction de la temperature. Les effets dynamiques sont derives de la compressibilite de l'huile, l'elasticite des parois du cylindre et de la compression adiabatique du gaz present dans la chambre de reserve. La caracteristique non-lineaire est la consequence de la relation non-lineaire entre la chute de pression dans le systeme de soupapes et le debit. Une equation empirique est utilisee pour arondir la transition qui apparait quand la soupape de surpression s'ouvre. La validite du modele est illustree par comparaison de simulations et d'experiments.

An integrated approach to characterize liquid leakage through metal contact seal : Launcher Technology

Abstract: Static seal is of major concern in spatial technology and because of severe thermodynamic conditions, direct metal/metal contact is often used. This work is a contribution to the study of liquid leakage through a rough metal contact resulting from the tightening of two machined surfaces. Our approach is based on experimental measurements of leak-rates on a model configuration close to a real design on the one hand and on theoretical developments for predictive estimates of leakage on the other hand. Experiments are performed on turned metal samples reproducing the contact surface of a real metal seal. The sample is pressed against a sapphire surface under a controlled contact pressure using a specific experimental set-up. Leak tests are carried out with a liquid and leak-rate is measured versus liquid pressure and contact load using gas chromatography. Starting from the initial topology of the surface, elastic and plastic deformations are computed applying contact pressures corresponding to the ones used in the experiment. Computed deformed surfaces are further employed to form the aperture field on a representative part of the contact on which flow computation is performed. Assuming the flow to be exclusively pressure driven, the equivalent permeability of the contact is computed using the local Reynolds approximation classically employed for flow in fracture with slowly varying aperture. Experimental results are commented and compared to predictions.