14 research outputs found
A novel approach to modelling and simulating the contact behaviour between a human hand model and a deformable object
A deeper understanding of biomechanical behaviour of human hands becomes fundamental for any human hand-operated Q2 activities. The integration of biomechanical knowledge of human hands into product design process starts to play an increasingly important role in developing an ergonomic product-to-user interface for products and systems requiring high level of comfortable and responsive interactions. Generation of such precise and dynamic models can provide scientific evaluation tools to support product and system development through simulation. This type of support is urgently required in many applications such as hand skill training for surgical operations, ergonomic study of a product or system developed and so forth. The aim of this work is to study the contact behaviour between the operatorsâ hand and a hand-held tool or other similar contacts, by developing a novel and precise nonlinear 3D finite element model of the hand and by investigating the contact behaviour through simulation. The contact behaviour is externalised by solving the problem using the bi-potential method. The human bodyâs biomechanical characteristics, such as hand deformity and structural behaviour, have been fully modelled by implementing anisotropic hyperelastic laws. A case study is given to illustrate the effectiveness of the approac
An adjacency representation for structural topology optimization using genetic algorithm
A new approach for continuum structural topology optimization using genetic
algorithms is presented in this paper. The proposed approach is based on a
representation by adjacency where the principle is founded on the concept of
connectivity of finite elements, considered as cells. This principle is
expressed by an adjacency matrix similar to that used in the graph theory.
The encoding of the structure solutions uses this matrix by transforming it
into a binary string. The research of optimal solution, i.e. the optimal
material distribution, is interpreted in this approach by the determination
of the connectivity of elements (cells). Using density variable, the
approach has some common points with the homogenization techniques. The
proposed approach is tested with simple benchmark applications
New Invariants for New Hyperelastic Anisotropic Models. The Special Case of a One Fiber Material
International audienc
Finite element modeling of abradable materials â Identification of plastic parameters and issues on minimum hardness against coating's thickness
Abradable materials are used to decrease the gas consumption of
aircraft engines by minimizing the gap between the blade tips and the
stator. The key idea consists in using the blades themselves to machine the
gap on the abradable coating. The best compromise between soft and hard
coating properties has to be reached to avoid blades wear and prevent
coating erosion by gas flux and particles. The plastic parameters of
abradable coating were identified by using an optimization process directly
connected to FEA. The first order optimization method (conjugate gradient
strategy + golden section algorithm) was applied to achieve the optimal
solution. A good agreement was found between experimental and numerical
results. The plastic parameters were used to study the hardness variability
of abradable materials with the coating thickness. Surprisingly, a minimum
hardness value was found while it was expected that hardness should be
always decreasing with thickness. It has been demonstrated that this minimum
is produced by the boundary conditions influence on hardness measurement.
This research work was completed within the Seal-Coat project funded by the
European Commission under the FP5 Growth Program
New Estimation of Electromagnetic Sound Power Radiated by a PM Machine: An Active and Passive Control Guideline
This paper presents an initial state of the art about the estimation of the sound power emitted by electrical machines. The paper proposes a new method, more accurate, to evaluate the sound power emitted by a PM machine by a 3D FEM mechanical analysis. It also takes into account tangential forces applied on the teeth. Finally the papers shows the impact of any harmonic force in the global emitted sound power in order to establish the most disturbing force. It proposes a guideline for active and passive noise control
New estimation of electromagnetic sound power radiated by a PM machine: en active and passive control guideline
International audienc
A New Passive Methodology for Controlling the Noise in Electrical Machines: Impact of some Parameters on the Modal Analysis
International audienc