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PAVIATH INTEGRATED SOLUTION
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SYSTEMS MULTI BODY DYNAMICS UM TOOLS AND CONFIGUARATIONS

Structure of UM and Additional Modules

UM
Automotive
Loco
Train
Track vehile
FEM
ROBOTS
QUICK TRACK
CAD
Experiment
Control
Base
Link
UM

Universal Mechanism consists of different modules and tools and may be delivered in the different configurations. The minimal, so called "base configuration" (UM Base), is a ready tool which allows carrying out dynamic analysis of mechanical systems. Functionality of the base configuration can be widened with the help of additional modules.

UM AutomotiveUM TrainUM LocoUM Tracked VehicleUM FEMUM CAD Interfaces
UM ExperimentsUM Control UM BaseUM SubsystemsUM DurabilityUM Ballast
UM 3D Contact UM RCF UM Rail/Wheel Wear UM Monotrain UM Driveline UM Maglev
Automotive

UM Automotive includes mathematical models of tires, program tools for description of road plan and road excitations. UM Automotive includes as well set of typical maneuvers, suspensions, steering systems and elements of trasmission. Module gives user the possibility to estimate dynamical behavior of the vehicle, including forces in the suspension force elements, safety and "road holding" factors, etc...

Loco

The program package includes module UM Loco intended for simulation of railway vehicle dynamics in both straight and curve railroad tracks. The simulation is performed in time domain by means of numeric integration of differential or differential-algebraic equations of motion. UM Loco allows the user to create fully parameterized models of vehicles...

Train

UM Train module automates the process of train model creation and the analysis of obtained results. The module allows computing the longitudinal dynamics of train in braking, traction and idling modes on a railway track of any configuration...

Track vehile

The UM Tracked Vehicle module of UM software has been developed for an automatic generation of models of tracked vehicles and analysis of their dynamics...

FEM

This module let the user a possibility to introduce into a mechanical system deformable bodies undergo large reference displacement but small deformation. Such an approach makes more exact results in comparison with multibody simulation and could be very useful in some cases. This approach could be useful for research of vibration of car body and carriage underframe during the motion of railway vehicle subject to influence from railway track irregularities and a power generating set..

CAD

Modern approach to design of machines and mechanisms assumes creating 3D models with the help of one of the computer-aided design (CAD) software with parallel strength and dynamics analysis. To simplify importing such models from CAD software to Universal Mechanism we developed tools for direct data import from CAD software to Universal Mechanism. Such import tools are collected within the UM CAD Interfaces module. The current UM version supports data import from Autodesk Inventor, SolidWorks, Unigraphics NX, KOMPAS and Pro/ENGINEER...

Experiment

It is often required in engineering practice to carry out series of numerical experiments, for example to analyze dynamical behavior and sensitivity of mechanical system or to find out optimal parameters of the system. UM Experiments gives a user a possibility to run series of numerical experiments automatically...

Control

Universal Mechanism includes UM Control module, which provides interface between Universal Mechanism and Matlab/Simulink. The user can compile his/her own Matlab/Simulink model and attach it into the Universal Mechanism. Matlab/Simulink interface gives the user a possibility to include unlimited number of Matlab/Simulink libraries and interactively turn on/off interfaces...

Base

  • The Module of Linear Analysis
  • Searching equilibrium positions
  • Linearization of equations of motion
  • Natural frequencies and modes
  • Plotting the root locus
  • Calculation of the critical velocity of railway vehicle

Link
UM PRESENTATIONS
ROBOTS

Walking Robots

istory Cooperation with Volgograd State Technical University and FRUND software: Inverse problem in dynamics of multibody systems applied to walking robots.

ROBOTS
QUICK TRACK

UM Quick Track

The UM Quick Track module is aimed for advanced visualization of the railway track for single rail vehicles and trains. The advanced track is drawing automatically based on the giving track macro geometry. UM Quick Track includes additional drawing of the concrete or timber sleepers and optional drawing of the ballast bed. This module does not affect dynamics of the system. It changes the visual representation of the railway track. The UM Quick Track may be used along with the UM Scene for the better cumulative effect.a text box on your website. Alternatively, when you select a text box a settings menu will appear. your website by double clicking on a text box on your website. Alternatively, when you select a text box

QUICK TRACK
Sub systems
Durability
Ballast
3D Contact
RCF
PNEUMATIC
SCENE
R/Wh. wear
Monotrain
Driveline
Maglev
Sub systems

Subsystem technique is a basis of modeling objects with large number of degrees of freedom and creation of database of typical design elements for modeling technical systems. By using this method an object is represented as a tree of subsystems, which are linked by means of force elements and constraints. Any object previously created by the user can be a subsystem. This object may contain any tree of subsystems...

Durability

The fatigue analysis starts with the dynamical hybrid model in Universal Mechanism. The flexibility characteristics of the structural parts are incorporated into UM model using a modal formulation based upon component mode synthesis. Basically, this method represents the part,s flexibility using a modal basis, which is optimized to account for constraint and force locations. The mode shape displacements and stresses are calculated using the finite element software. The UM Durability module combines the stress time history information generated during series of numerical experiments in UM and the material fatigue strength characteristics to generate the predicted life distribution in the part...

Ballast

This module allows including in a UM model a planar granular media, which is a set of particles (rigid polygons and circles). The particles interact with each other by contact forces. Simple models of contact forces are used in the module. Each force consists of two components. The first component is a linear viscoelastic normal force. Another one is a dry friction force with two modes: sliding and sticking...

3D Contact

This module allows simulating of contact interaction of bodies by contact manifolds (graphical objects). The realized contact algorithm is based on the simulation of interaction of arbitrary convex polyhedrons. The set of supplied primitives includes the following types: box, cylinder, cone, ellipsoid, and polyhedron

RCF

  • UM Rolling Contact Fatigue
  • UM Rolling Contact Fatigue allows the user
  • Fatigue strength criterion
  • Wheel model
  • Solution of the contact problem
  • Assumptions
  • Example of comparative calculation
  • References

R/Wh. wear

  • Introduction
  • Set of experiments
  • Simulation of railway vehicle/track interaction dynamics
  • Contact models
  • Wear models and profile updating
  • Two approaches for wear simulation
  • Applications
  • References
  • User’s manual and presentation

Monotrain

Simulation of Monorail Train Dynamics
Program package Universal Mechanism includes a specialized module UM Monorail Train for analysis of 3D dynamics of both single vehicle and trains. The module includes additional tools integrated into the program kernel.

Driveline

UM Driveline

  • Mechanical rotation converter with a constant ratio
  • Simplified model of a planetary drive
  • Differential
  • Fluid coupling
  • Hydraulic torque converter
  • Hydrostatic drive
  • Internal combustion engine

Maglev

Simulation of MagLev Dynamics
Program package Universal Mechanism includes a specialized module UM MagLev for analysis of 3D dynamics of magnetic levitation vehicles. The module includes additional tools integrated into the program kernel.

PNEUMATIC

Simulation of multibody systems with pneumatic elements

Program package Universal Mechanism includes a specialized module UM Pneumatic Systems, which contains tools for simulation of models with pneumatic elements. The following elements are available in the current version of the module:

  • Air springs
  • Rigid chambers
  • Pneumatic lines
  • Orifices
UM PNEUMATICS
SCENE

UM Scene

UM Scene module is aimed for preparing photorealistic environment and includes the collec-tion of 3D objects, textures, sky boxes and tools integrated into UM Simulation program. Collection of 3D objects includes buildings (country houses, apartments, industrial buildings), road sections (straight sections, turns, cross roads), road and street elements (fences, benches, trash bins, road signs, traffic lights, lamps), trees and bushes, static cars, trucks and trailers.

UM SCENE
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