Efficiency of a Multiple Flywheel Recuperation System

1994 ◽  
Vol 116 (1) ◽  
pp. 332-336 ◽  
Author(s):  
P. Marinov ◽  
S. Pavlov ◽  
V. Draganov
Keyword(s):  
Kinetic Energy ◽  
Dynamic Models ◽  
Energy Losses ◽  
Stored Energy ◽  
Conventional Systems

A multiple flywheel has been studied for the purpose of storing and recuperating kinetic energy. The objective of the design of such systems is a maximum storage and recuperation of the stored energy. Dynamic models of the proposed and the conventional systems are compared regarding energy losses. A coefficient of recuperating efficiency is introduced for demonstrating the advantages of the multiple flywheel system.

scholarly journals Dynamics of 3 – Links Articulated Robotic Manipulator: A Computational Model

2020 ◽  
Vol 9 (3) ◽  
pp. 1911-1915
Keyword(s):  
Kinetic Energy ◽  
Computational Model ◽  
Dynamic Models ◽  
Robotic Manipulator ◽  
Complex Nature ◽  
Dynamic Computation

Dynamic computation include the process of determining the forces and energies that would cause a manipulator to move certain distance at a given angle. The complex nature of available materials has made this process difficult. The dynamics equation for a 3-links robotic manipulator was designed using the Lagrange archetypal. The result shows that the energies (including Potential and Kinetic Energy) as well as the torques required to cause motion at each joint can be computed separately. The torque equations represents the dynamic models required.

scholarly journals The Old Nova BT Monocerotis

1984 ◽  
Vol 80 ◽  
pp. 95-99
Author(s):  
W. C. Seitter
Keyword(s):  
Kinetic Energy ◽  
High Velocity ◽  
Laval Nozzle ◽  
Emission Lines ◽  
Energy Losses ◽  
Lagrangian Point ◽  
Spectroscopic Observations ◽  
Gas Streams

AbstractSpectroscopic observations through most of the eclipse cycle of BT Mon reveal the presence of both low and high velocity gas streams. Acceleration through a Laval-nozzle-effect at the inner Lagrangian point of the system and powering of the emission lines through kinetic energy losses of Coriolis deflected and subsequently colliding gas streams are considered as possible mechanisms at work in the system.

Evaluation of kinetic energy losses in fluid flow in tubes

1965 ◽  
Vol 9 (3) ◽  
pp. 264-268 ◽  
Author(s):  
P. N. Romanenko ◽  
V. N. Kharchenko
Keyword(s):  
Fluid Flow ◽  
Kinetic Energy ◽  
Energy Losses

scholarly journals Distribution of kinetic energy losses between nozzles and turbine impeller on partial gas supply modes

2021 ◽  
pp. 122-126
Author(s):  
Ю.В. Соломахин ◽  
Л.П. Цыганкова ◽  
В.Н. Коршунов
Keyword(s):  
Kinetic Energy ◽  
Pressure Ratio ◽  
Experimental Studies ◽  
Average Diameter ◽  
Rotor Blades ◽  
Low Flow ◽  
Energy Losses ◽  
Outlet Section ◽  
Technical Literature ◽  
Actual Flow Rate

В статье приведены результаты экспериментальных исследований связанных с распределением потерь кинетической энергии между сопловым аппаратом и рабочим колесом у осевых малорасходных турбинных ступеней. У всех ступеней конструктивные углы выхода сопел были менее 9°, что повлекло за собой необходимость выполнения рабочих колес с относительным шагом установки рабочих лопаток значительно большим, рекомендованного в технической литературе. Исследования проведены для ступеней со средним диаметром 250 мм. Диапазон изменения факторов составил: отношение давлений перед соплами к давлению за ступенью от 2.0 до 5.0; частоты вращения вала с рабочим колесом от 0 до 14000 . Эффективность использования кинетической энергии приведена в виде коэффициентов скорости соплового аппарата и рабочего колеса. Коэффициенты представляют собой отношение реальной скорости потока на выходе из соплового аппарата (рабочего колеса) к теоретически возможной скорости газа в выходном сечении рассматриваемого элемента ступени. Выявлено, что коэффициенты скорости сопловых аппаратов и рабочих колес изменяются не только при смене режимных параметров, таких как частота вращения ротора и отношения давлений на ступень, но и при изменении степени парциальности ступени. The article presents the results of experimental studies related to the distribution of kinetic energy losses between the nozzle apparatus and the impeller at axial low-flow turbine stages. At all stages, the design angles of the nozzle exit were less than 9 °, which entailed the necessity of making impellers with a relative pitch of the rotor blades that was much larger, as recommended in the technical literature. The studies were carried out for steps with an average diameter of 250 mm. The range of variation of the factors was the ratio of the pressures in front of the nozzles to the pressure behind the stage from 2.0 to 5.0; rotation speed of the shaft with the impeller from 0 to 14000 rpm. The efficiency of using the kinetic energy is given in the form of the coefficients of the speed of the nozzle apparatus and the impeller. The coefficients represent the ratio of the actual flow rate at the outlet of the nozzle apparatus (impeller) to the theoretically possible gas velocity in the outlet section of the stage element under consideration. It was found that the speed coefficients of the nozzle apparatus and impellers change not only when changing operating parameters, such as the rotor speed and the pressure ratio per stage, but also when changing the degree of stage partiality.

scholarly journals Analysis of energy losses in electric transmis-sion taking into account the Sommerfeld – Kononenko effect

2021 ◽  
pp. 185
Author(s):  
Mihael Abovich Podrigalo ◽  
Nadegda Mihaelovna Podrigalo ◽  
Georgy Sergeevich Serikov ◽  
Irina Alekseevna Serikova
Keyword(s):  
Electric Vehicle ◽  
Dynamic Model ◽  
Electric Motor ◽  
Angular Speed ◽  
Energy Approach ◽  
Energy Losses ◽  
Stored Energy ◽  
Complex Motion ◽  
Additional Energy ◽  
The Law

The use of an electric drive in modern vehicles allows solving a number of problems related to the issues of environmental and energy security of the country. However, this approach imposes a number of practical limitations. Among them there is such a significant factor as the limitation on the stored energy in the traction batteries and, as a consequence, the limitation of the mileage on one charge. One of the ways to solve this problem is to reduce mechanical losses associated with the appearance of resonance phenomena in rotating transmission elements and having an unbalanced mass. Goal. The goal is to assess the influence of the Sommerfeld – Kononenko effect on energy indicators during the transfer of rotation from the electric motor to the drive wheel of an electric vehicle. To achieve this goal, it is necessary to determine the law of motion of the rotor of an electric motor and a car wheel using the energy approach and a model of complex motion. Methodology. To solve the problem of determining the law of rotation of an electric motor rotor, a dynamic model of an eccentric vibrator is adopted. The study takes into account the fluctuations in the angular velocity of the shaft with Hooke's hinge when the shaft axis deviates from horizontal positions. It is proposed to apply an energy approach using a model of complex motion to determine the law of rotation of an electric motor rotor and a wheel. Results. The dependence of the speed of rotation of the wheel of an electric vehicle is determined in accordance with the dynamic model under the conditions of fluctuations in the angular speed of transmission elements with Hooke's hinge when the wheel axis deviates from the horizontal position. Practical value. An energy approach is proposed for finding losses in a complex motion model to determine the law of rotation of an electric motor rotor and a wheel. An analytical dependence of additional energy losses caused by wheel unbalance on vehicle mileage and wheel unbalance is found.

scholarly journals A New Mechanism for Soft Landing in Robotic Space Exploration

Robotics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 103 ◽  
Author(s):  
Stefano Seriani
Keyword(s):  
Solar System ◽  
Kinetic Energy ◽  
Potential Energy ◽  
System Design ◽  
Dynamic Models ◽  
Space Exploration ◽  
Reactive Force ◽  
Soft Landing ◽  
Theoretical Limit ◽  
Robotic Space Exploration

Landing safely is the key to successful exploration of the solar system; the mitigation of the connected effects of collision in mechanical systems relies on the conversion of kinetic energy into heat or potential energy. An effective landing-system design should minimize the acceleration acting on the payload. In this paper, we focus on the application of a special class of nonlinear preloaded mechanisms, which take advantage of a variable radius drum (VRD) to produce a constant reactive force during deceleration. Static and dynamic models of the mechanism are presented. Numerical results show that the system allows for very efficient kinetic energy accumulation during impact, approaching the theoretical limit.

Autonomous jumping robot with regulable trajectory and flexible feet

2014 ◽  
Vol 228 (15) ◽  
pp. 2820-2832 ◽  
Author(s):  
H Chai ◽  
WJ Ge ◽  
F Yang ◽  
GM Yang
Keyword(s):  
Kinetic Energy ◽  
Center Of Mass ◽  
Energy Conversion Efficiency ◽  
Stored Energy ◽  
Dynamics Modeling ◽  
Adjustable Mechanism ◽  
Jumping Robot ◽  
The One ◽  
Mass Increase ◽  
Better Than

In this paper, a prototype of jumping robot with flexible feet is proposed to surmount obstacle efficiently. A six-bar adjustable mechanism for regulating jumping height and distance as well as a self-righting mechanism for uprighting after falling down are presented. The jumping height, jumping distance and energy conversion efficiency (ECE) are analyzed and tested, respectively, through dynamics modeling and jumping experiments. Taking advantage of flexible feet whose parameters are optimally designed, both the ground impulse acting on the robot and external kinetic energy relating to the movement of robot’s center of mass increase, so the performance of jumping height and distance as well as ECE of the robot with flexible feet is better than that of the one without flexible feet. By reducing leg mass and take-off angle as well as increasing stored energy, the external kinetic energy is enlarged, and ECE of the robot with flexible feet could be further improved. Meanwhile, simulation results show that the existing jumping robots which adopt four- or six-bar jumping mechanism are capable of enhancing jumping height and distance as well as ECE by exploiting flexible feet.

Solar Chimney Cycle Analysis With System Loss and Solar Collector Performance

2000 ◽  
Vol 122 (3) ◽  
pp. 133-137 ◽  
Author(s):  
Anthony J. Gannon ◽  
Theodor W. von Backstro¨m
Keyword(s):  
Experimental Data ◽  
Simple Model ◽  
Power Plant ◽  
Kinetic Energy ◽  
Solar Collector ◽  
Large Scale ◽  
Small Scale ◽  
Energy Losses ◽  
Solar Chimney ◽  
Solar Chimney Power Plant

An ideal air standard cycle analysis of the solar chimney power plant gives the limiting performance, ideal efficiencies and relationships between main variables. The present paper includes chimney friction, system, turbine and exit kinetic energy losses in the analysis. A simple model of the solar collector is used to include the coupling of the mass flow and temperature rise in the solar collector. The method is used to predict the performance and operating range of a large-scale plant. The solar chimney model is verified by comparing the simulation of a small-scale plant with experimental data. [S0199-6231(00)00503-7]

Ejector Irreversibility Characteristics

2003 ◽  
Vol 125 (1) ◽  
pp. 121-129 ◽  
Author(s):  
A. Arbel ◽  
A. Shklyar ◽  
D. Hershgal ◽  
M. Barak ◽  
M. Sokolov
Keyword(s):  
Shock Wave ◽  
Kinetic Energy ◽  
Entropy Production ◽  
Performance Optimization ◽  
Normal Shock ◽  
Energy Losses ◽  
Normal Shock Wave ◽  
Ideal Mixing ◽  
Overall Performance ◽  
Inlet Conditions

The present study analyzes and characterizes the irreversibility of the ejector’s internal processes in an effort to improve the understanding of the making of its overall performance. The analysis presented is based on entropy production methodology. Since entropy production is equivalent to performance losses, minimizing entropy production could serve as a tool for performance optimization. The three main internal processes forming sources of ejector irreversibility are mixing, kinetic energy losses, and normal shock wave. Comparison of these with those of an ideal mixing process, an ideal turbine-compressor system and stagnation conditions (of the flow after mixing) provides the benchmarks against which the actual overall performance is measured. By identifying the sources of irreversibility, the analysis provides a diagnostic tool for performance improvements. While irreversibility due to mixing can be eliminated by appropriate choice of gas and/or inlet conditions and an appropriate adjustable throat can eliminate losses associated with normal shock wave–kinetic energy losses can only be reduced but not totally eliminated.

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