The stability of upright posture is usually analyzed by means of force platform measurements. The outcome is the trajectory of the Center of Pressure (COP) of the ground reaction. This point is not coincident with the projection of the Center of Mass (COM) on the support surface and the evolution of the COM-COP difference is a physiologically significant variable. In the paper an algorithm is described for recovering the COM from the COP: it is based on a dynamic model (the postural inverted pendulum) and the integration of the corresponding ordinary differential equation by means of a...
The present paper describes the technological system used to rationalize the production. An important feature in introducing this system into production is the correct arrangement and ergonomics of work station and components. The technological system for analyzing and introducing the ergonomic environment and products contains the ergonomic programme package ANTHROPOS and the digitalizing system GP12. As an example the analysis of the introduction of the work station in the working environment is presented.
The present work investigates the application of magnetostrictive amorphous ribbons (AR, thickness d AR ≈ 30 µm) for the detection of mechanical bending. Such ribbons exhibit high bending sensitivity if used as a bimetal where the second component is a nonmagnetic carrier ribbon (CR) of thickness d CR . The aim of this study was to develop a bimetal ribbon which is fixed to the skin of the human body and should adjust itself to dynamic changes of the skin curvature. A main problem results from the demand of good flexibility - favoured by low d CR - as well as high sensitivity - favoured by...
The present paper concerns acoustic measurements in connection with the sleep apnea syndrome. The latter induces pathophysiologic changes in the respiratory and circulatory systems and is diagnosed by polysomnography (PSG). PSG comprises the measurement of many parameters and thus tends to be expensive and time consuming. In contrast to available portable devices which use many distributed sensors, we propose a single acoustic sensor in the heart region from which multiple information is derived through excessive signal processing. Measurement is performed by means of a microphone...
Abstract : The presented study was conducted to analyse the electrooculography signal. We have computed the smooth pursuit eye movements gain before and after subcutaneous apomorphine administration. The results showed significant differences between groups of patients and healthy volunteers.
In the field of biomechanics, in sport as well as in rehabilitation, it is very important to deduce the muscle-force knowing the torque of the joints. So called knee-dynamometers are used for this purpose. These dynamometers must follow given velocity-courses of the measuring lever regardless of the torque to be measured. Up to now there are only dynamometers available for measuring static torques and torques with constant velocity. However, these dynamometers can only measure the torque of isometric contractions and extensions or flexions of the knee joint with constant angular velocity....
This paper deals a method of tactile pattern recognition. It is based on discriminatory analysis. The computation goes through separate pattern classes. The Ivanovic deviation is used as a discriminatory function in this case. The m dimensional vector is input parameter. The method can be classified into n groups of patterns. Because the classification function Ivanovic deviation is probability function, influence of features sequence on right pattern recognition appears here. This problem is study in this paper.
In some large industries, a robotic arm describing predefined paths in work volume and carrying a welding gun executes automatic welding operations. The deviations in relation to ideal robot arm predefined paths may cause severe distortions in welded parts. The displacement along a straight path must be close to the ideal straight line and the deviations cause a poor quality weld. In this case, the straightness errors in two orthogonal planes crossing the planned welding line can be considered as parameters to predict welding quality. In this work, an approach was used to investigate the...
We propose to apply the genetic algorithm (GA) to generation of pulse pattern for the multiple supersonic sensors to measure distance. Such the supersonic sensors are, for example, to be devised on a autonomous mobile robot. Those supersonic sensors actually yield crosstalk themselves on a real robot. The pulse pattern has to satisfy some conditions to keep probability of erroneous measurement caused by the crosstalk low. While A problem to generate such pulse pattern is difficult, it should be solved by using the GA as a combinatorial optimization problem. In this paper, we propose two ways...
Due to its numerous qualities, namely their low cost, infrared reflective optocouplers are of large use in the industry to detect an object passing in their field of view. They nevertheless are mainly limited to deliver a pure dichotomic information. The purpose of the paper is to propose several solutions for using this component as an accurate position sensor at the industrial level. Linear and angular displacements are both considered with emphasis on a linear response. A global linearity of about 1% is achieved for a few centimeters and a few tens of degrees ranges.