Prognostic Research for the Dynamic Processes and Load Characteristics of Spacecraft

2018 ◽  
Author(s):  
Shimin Song ◽  
Zhijian Zhao ◽  
Huamao Wang ◽  
Yifan Liu
Keyword(s):  
Dynamic Processes ◽  
Prognostic Research ◽  
Load Characteristics

scholarly journals Numerical simulation of dynamic processes in transmission of vehicle

2021 ◽  
Vol 1 (1) ◽  
pp. 38-45
Author(s):  
S.I. Hoodorozhkov ◽  
◽  
A.А. Krasilnikov ◽  
Keyword(s):  
Numerical Simulation ◽  
Systematic Approach ◽  
Power Transmission ◽  
Combustion Engine ◽  
Dynamic Processes ◽  
Main Attention ◽  
Software Packages ◽  
Digital Modeling ◽  
Load Characteristics ◽  
Engine Friction

The article considers the issues of digital modeling of dynamic processes in the transmissions of vehicles. The purpose of this research was to develop an algorithm for numerical mathematical modeling of dynamic processes in the transmissions of transport vehicles using modern digital software packages. The method includes a systematic approach to the study of dynamic processes during switching, based on modeling the operation of the gearbox together with the internal com-bustion engine (taking into account its dynamic, speed and load characteristics). The order of appli-cation of the MATLab – Simulink, Simscape software for numerical simulation of dynamic pro-cesses is considered. Using the fundamental blocks of these applications, models of physical com-ponents are created: the internal combustion engine, friction clutches, gearboxes, elastic shafts, damping devices, and tractor power transmission control systems. A digital model of the tractor transmission is created, its design scheme is given, and the initial characteristics are set. It was used to simulate dynamic processes in the tractor gearbox. The main attention in this paper is paid to the application of the proposed method for calculating the dynamic processes in the gearbox during gear changes under load with forward and reverse switching, including the simultaneous use of several friction clutches.

Surface reactions observed by photoemission electron microscopy (PEEM)

1992 ◽  
Vol 50 (1) ◽  
pp. 286-287
Author(s):  
H.H. Rotermund
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Work Function ◽  
Chemical Reactions ◽  
Reaction Diffusion ◽  
Dynamic Processes ◽  
Clean Surface ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Photoemission Electron

Chemical reactions at a surface will in most cases show a measurable influence on the work function of the clean surface. This change of the work function δφ can be used to image the local distributions of the investigated reaction,.if one of the reacting partners is adsorbed at the surface in form of islands of sufficient size (Δ>0.2μm). These can than be visualized via a photoemission electron microscope (PEEM). Changes of φ as low as 2 meV give already a change in the total intensity of a PEEM picture. To achieve reasonable contrast for an image several 10 meV of δφ are needed. Dynamic processes as surface diffusion of CO or O on single crystal surfaces as well as reaction / diffusion fronts have been observed in real time and space.

Dynamic processes in dielectric glasses at low temperatures

1982 ◽  
Vol 136 (2) ◽  
pp. 317 ◽  
Author(s):  
B.P. Smolyakov ◽  
E.P. Khaimovich
Keyword(s):  
Low Temperatures ◽  
Dynamic Processes

TO THE STABILITY OF TANK VEHICLES IN THE BRAKE MODE

2019 ◽  
pp. 27-32
Author(s):  
Denys Popelysh ◽  
Yurii Seluk ◽  
Sergyi Tomchuk
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Distribution Systems ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Center Of Mass ◽  
Dynamic Processes ◽  
Course Stability ◽  
The Stability ◽  
Tank Vehicles

This article discusses the question of the possibility of improving the roll stability of partially filled tank vehicles while braking. We consider the dangers associated with partially filled tank vehicles. We give examples of the severe consequences of road traffic accidents that have occurred with tank vehicles carrying dangerous goods. We conducted an analysis of the dynamic processes of fluid flow in the tank and their influence on the basic parameters of the stability of vehicle. When transporting a partially filled tank due to the comparability of the mass of the empty tank with the mass of the fluid being transported, the dynamic qualities of the vehicle change so that they differ significantly from the dynamic characteristics of other vehicles. Due to large displacements of the center of mass of cargo in the tank there are additional loads that act vehicle and significantly reduce the course stability and the drivability. We consider the dynamics of liquid sloshing in moving containers, and give examples of building a mechanical model of an oscillating fluid in a tank and a mathematical model of a vehicle with a tank. We also considered the method of improving the vehicle’s stability, which is based on the prediction of the moment of action and the nature of the dynamic processes of liquid cargo and the implementation of preventive actions by executive mechanisms. Modern automated control systems (anti-lock brake system, anti-slip control systems, stabilization systems, braking forces distribution systems, floor level systems, etc.) use a certain list of elements for collecting necessary parameters and actuators for their work. This gives the ability to influence the course stability properties without interfering with the design of the vehicle only by making changes to the software of these systems. Keywords: tank vehicle, roll stability, mathematical model, vehicle control systems.

Multicomponent system for Black Sea dynamic processes diagnoses and prediction

2007 ◽  
Vol 13 (1s) ◽  
pp. 26-28
Author(s):  
Yu.B. Ratner ◽  
◽  
M.V. Ivanchik ◽  
Т.М. Bayankina ◽  
E.V. Plotnikov ◽  
...  
Keyword(s):  
Black Sea ◽  
Multicomponent System ◽  
Dynamic Processes
Sign in / Sign up

Export Citation Format

Share Document