Reduction of energy losses on car movement while using a combined electromechanical drive of leading wheels

This article addresses the problem that fluctuations in the torque of an internal combustion engine (ICE) lead to additional energy losses, as it causes fluctuations in the speed and kinetic energy of the car. These losses increase as the frequency of oscillations of the torque of the internal combustion engine approaches the frequency of free (natural oscillations) of the running gear of the car in the longitudinal direction. If there is an elastic connection between the traction force and the movement of the car, the movement of the latter can be represented as complex. At the same time, the portable movement is uniform, and the relative movement is oscillatory. This article presents the results of the study of these losses for cars with mechanical and combined electromechanical drive wheels. Analytical expressions are obtained, which allows to take into account additional energy losses including the tangential rigidity of the tire and the rigidity of the suspension in the longitudinal direction. When using a combined electromechanical drive of the drive wheels as well as in the case of a mechanical transmission of a car, the resonance is dangerous. But with the increase in the share of torque kem on the wheel generated by the electric motor, the relative additional energy losses for the movement of the car are reduced

Improvement of the method for assessing the energy load of vehicle

The aim of the research is to improve the indicators assessment accuracy of the vehicle energy load by improving the method of experimentally - theoretical determination of the aerodynamic drag parameters of vehicle in motion. To achieve this goal, it is necessary to solve the problem of determining the dependence of the energy load level on vehicle speed with varying frontal aerodynamic drag coefficient. Studies carried out to clarify the calculation of the parameters of vehicle aerodynamic drag in motion made it possible to determine the correlation between the actual effective engine capacity and the maximum kinetic energy of vehicle at translational motion. When determining the vehicle aerodynamic drag, the constant coefficient of aerodynamic drag is used depending on the speed in all range of vehicle speeds. This leads to significant mistakes in determining the necessary engine capacity expendable to overcome the aerodynamic drag, and vehicle fuel consumption. As a result of the research, analytical expressions, allowing to take into account additional energy losses and correlation between the kinetic energy of the vehicle steady motion and the effective engine capacity have been obtained. The theoretical contribution of the research is that the correlation coefficient between the kinetic energy of vehicle in motion and the effective engine capacity – have been proposed. Studies have shown that if speed of vehicle increases the indicator will monotonously decrease in the range of actual speeds

Hand-grip strength as an indicator for predicting the success in martial arts athletes

The purpose of this work is answer the question whether based on the hand grip strength of different martial arts’ athletes it is possible of their successfulness prognosticatio

Evaluation of physical development of Ukrainian city pupils in dynamics of 35 years monitoring period (1974 – 2009 years)

Purpose: comparative analysis of physical development parameters of Ukrainian city pupils in dynamics of 35 years monitoring period, determination of level and harmony of physical development of modern pupils. Participants: it was examined 2453 city children and teenagers of 6-17 year old (1224 boys and 1229 girls). Comparison was carried out with results of 1974 year. The analysis of physical development was carried out according to the official tables containing regression scales of the body length. Results: it is observed reliable (p<0,01) and highly reliable (p<0,001) body length augmentation in comparison with equals in age in 1970th in all age and gender groups of pupils (except 8 year old children). Since 11 year old, modern children were authentically taller (р<0,001) than equals in age in 1974. Comparison of body weight of boys determined that from 11 up to 13 year old modern pupils reliably exceed equals in age in 1970th. It is determined similar differences in 12-13 year old girls. It is observed reliable augmentation of chest circumference in 12-14 year old girls and also in 11-12 and 15-17 year old boys in comparison with equals in age in 1974 year. There are no gender differences in distribution of children by the level of physical development. Conclusions: it is determined the following consistent patterns and features of physical development of Ukrainian city pupils during 1970th – 2000th years: no more than 57-59% of pupils have average and harmonious physical development; every 6th boy and every 5th girl have overweight; it is observed high-quality and quantitative reliable deterioration in physical development and morphofunctional state in children of both genders during study at school. It is most expressed in boys; from 1st up to the 4th form pupils with disharmonious development becomes in 2,5 times more weighty (about 12%), and up to 9th form – in 7 times (about 20% respectively)

Rationale for the study of eating behavior of children and adolescents as a factor in their health savings

Deterioration in children's health necessitates the development and implementation saving health programs. Important places in there are questions of behaviors take, as part of a person's lifestyle. Justified hygienic principles study of eating behavior of children, adolescents and youth, offered his assessment methodology suitable for health monitoringУхудшение здоровья детского населения обусловливает необходимость разработки и внедрения здоровьесберегающих программ. Важное место в них занимают вопросы пищевого поведения, как составной части образа жизни человека. Обоснованы гигиенические принципы исследования пищевого поведений детей, подростков и молодежи, предложена методология его оценки, пригодная для мониторинга здоровь

Providing healthsaving mode orientation of children in recreation and rehabilitation

It was investigated the features of the regime of the day students in the period of rest and recovery. It was formulated the main principles of hygiene supplies for recreation, it was proved the presence of health-saving by optimizing the orientation components of the daily routineИзучены особенности режима дня школьников в период отдыха и оздоровления. Сформулированы основные принципы гигиенического обеспечения рекреации, доказано наличие здоровье сберегающей направленности за счет оптимизации компонентов режима дн

Application of fractional accelerations for determination of braking vehicle energy loading

З використанням методу парціальних прискорень розроблено уточнений алгоритм визначення складових енергетичного балансу автомобіля при гальмуванні.The precise algorithm for determination of the vehicle energy balance constituents at braking with fractional acceleration method application is developed

STABILITY OF WHEELED VEHICLES AS COMPLEX OPERATIONAL PROPERTIES

Different views on the definition of «stability of wheeled vehicles» are considered and the author’s own definition is offered. A version of the structure of stability properties as a complex op-erational property is offered