DSpace Komunita:http://hdl.handle.net/11025/13132019-08-20T22:50:32Z2019-08-20T22:50:32ZUse of electromyography measurement in human body modelingValdmanová, LindaČechová, Hanahttp://hdl.handle.net/11025/19662016-01-18T10:08:54Z2011-01-01T00:00:00ZNázev: Use of electromyography measurement in human body modeling
Autoři: Valdmanová, Linda; Čechová, Hana
Abstrakt: The aim of this study is to test the use of the human body model for the muscle activity computation. This
paper shows the comparison of measured and simulated muscle activities. Muscle active states of biceps brachia
muscle are monitored by method called electromyography (EMG) in a given position and for given subsequently
increasing loads. The same conditions are used for simulation using a human body model (Hynˇc´ık, L., Rigid Body
Based Human Model for Crash Test Purposes, EngineeringMechanics, 5 (8) (2001) 1–6). This model consists of
rigid body segments connected by kinematic joints and involves all major muscle bunches. Biceps brachia active
states are evaluated by a special muscle balance solver. Obtained simulation results show the acceptable correlation
with the experimental results. The analysis shows that the validation procedure of muscle activities determination
is usable.2011-01-01T00:00:00ZValdmanová, LindaČechová, HanaStress analysis of finite length cylinders of layered mediaDesai, PayalKant, Tarunthttp://hdl.handle.net/11025/18992016-01-18T10:18:29Z2011-01-01T00:00:00ZNázev: Stress analysis of finite length cylinders of layered media
Autoři: Desai, Payal; Kant, Tarunt
Abstrakt: In this paper, we analyze an orthotropic, layered (0/90) and (0/core/0) sandwich cylinders under pressurized load with a diaphragm supported boundary conditions which is considered as a two dimensional (2D) plane strain boundary value problem of elasticity in (r, z) direction. A simplified numerical cum analytical approach is used for the analysis. Boundary conditions are satisfied exactly by using an analytical expression in longitudinal (z) direction in terms of Fourier series expansion. Resulting first order simultaneous ordinary differential equations (ODEs) with boundary conditions prescribed at r = ri, ro defines a two point boundary value problem (BVP), whose equations are integrated in radial direction through an effective numerical integration technique by first transforming the BVP into a set of initial value problems (IVPs). Numerical solutions are first validated for their accuracy with 1D solution of an infinitely long cylinder. Stresses and displacements in cylinders of finite lengths having various l/R and h/R ratios are presented for future reference.2011-01-01T00:00:00ZDesai, PayalKant, TaruntCar impact to pedestrian - fast 2D numerical analysisHynčík, LuděkČechová, Hanahttp://hdl.handle.net/11025/17782016-02-25T11:56:44Z2011-01-01T00:00:00ZNázev: Car impact to pedestrian - fast 2D numerical analysis
Autoři: Hynčík, Luděk; Čechová, Hana
Abstrakt: The paper concerns a modelling approach for fast 2D car to pedestrian impact analysis. The pedestrian model is
composed using the Lagrange equations with multipliers. The model consists of rigid bodies defining the major
human body segments. The bodies are connected by rotational joints with non-linear response. The model is
scalable based on the age and the gender. The car model is multi-segment composed as an open polygon. Between
the pedestrian and the car, there are contacts defined and modelled explicitly by force-penetration dependence. For
a given car profile design and a given human gender, age and percentile, the pedestrian impact consequences can
be evaluated quickly by means of virtual numerical analysis.2011-01-01T00:00:00ZHynčík, LuděkČechová, HanaBending of a nonlinear beam reposing on an unilateral foundationMachalová, JitkaNetuka, Horymírhttp://hdl.handle.net/11025/13802019-06-11T06:16:00Z2011-01-01T00:00:00ZNázev: Bending of a nonlinear beam reposing on an unilateral foundation
Autoři: Machalová, Jitka; Netuka, Horymír
Abstrakt: This article is going to deal with bending of a nonlinear beam whose mathematical model was proposed by
D. Y. Gao in (Gao, D. Y., Nonlinear elastic beam theory with application in contact problems and variational
approaches,Mech. Research Communication, 23 (1) 1996). The model is based on the Euler-Bernoulli hypothesis
and under assumption of nonzero lateral stress component enables moderately large deflections but with small
strains. This is here extended by the unilateralWinkler foundation. The attribution unilateral means that the foundation
is not connected with the beam. For this problem we demonstrate a mathematical formulation resulting
from its natural decomposition which leads to a saddle-point problem with a proper Lagrangian. Next we are concerned
with methods of solution for our problem by means of the finite element method as the paper (Gao, D. Y.,
Nonlinear elastic beam theory with application in contact problems and variational approaches, Mech. Research
Communication, 23 (1) 1996) has no mention of it. The main alternatives are here the solution of a system of
nonlinear nondifferentiable equations or finding of a saddle point through the use of the augmented Lagrangian
method. This is illustrated by an example in the final part of the article.2011-01-01T00:00:00ZMachalová, JitkaNetuka, Horymír