Getting Started with Lotus Suspension Analysis
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VERSION 5.01 GETTING STARTED WITH LOTUS SUSPENSION ANALYSIS VERSION 5.04 The information in this document is furnished for informational use only, may be revised from time to time, and should not be construed as a commitment by Lotus Cars Ltd or any associated or subsidiary company. Lotus Cars Ltd assumes no responsibility or liability for any errors or inaccuracies that may appear in this document. This document contains proprietary and copyrighted information. Lotus Cars Ltd permits licensees of Lotus Cars Ltd software products to print out or copy this document or portions thereof solely for internal use in connection with the licensed software. No part of this document may be copied for any other purpose or distributed or translated into any other language without the prior written permission of Lotus Cars Ltd. ©2015 by Lotus Cars Ltd. All rights reserved. CONTENTS 1 - INTRODUCING LOTUS SUSPENSION ANALYSIS 1.1 Overview ..................................................................................1 1.2 What is Lotus Suspension Analysis? .......................................2 1.3 Normal Uses of Lotus Suspension Analysis.............................2 1.4 Overall Concepts......................................................................2 1.5 Coordinate system ...................................................................3 1.6 Default Sign convention ...........................................................3 1.7 About the Tutorials ...................................................................4 2 - GETTING STARTED 2.1 Overview ..................................................................................5 2.2 Starting the Application ............................................................6 2.3 Creating a New Model..............................................................8 2.4 Manipulating the Graphical View............................................11 2.5 Displaying Graphical Results .................................................14 2.6 Displaying Text Results..........................................................15 2.7 Bump, Steer and Roll Kinematics...........................................16 2.8 Animation Suspension Kinematics .........................................19 2.9 Saving Data Files ...................................................................20 2.10 Closing the Application...........................................................20 3 - INTERACTIVE TEMPLATE MODIFICATION 3.1 Overview ................................................................................21 3.2 Adding Points to the Template ...............................................22 3.3 General Addition and Deletion ...............................................26 3.4 Adding Calculated Points .......................................................28 3.5 Merging Springs and Dampers...............................................29 3.6 Converting Corner to Axle Model ...........................................30 3.7 Add Two Part Rack to Model..................................................30 3.8 Add Roll Bar to Model ............................................................31 3.9 Add Compliant Hub to Model .................................................32 3.10 Add Drive shaft to Model........................................................33 3.11 Add Spacer to Model..............................................................34 3.12 Mesh a Rigid Part...................................................................36 3.13 Convert Ball Joint to Slot........................................................37 3.14 Exercise 1: Modifying a Models Standard Template ..............38 3.15 Exercise 2: Working with Spacers..........................................41 4 - EXTENDED TRAVEL OPTIONS 4.1 Overview ................................................................................43 4.2 Introduction ............................................................................44 4.3 Setting the Extended Module Type ........................................45 4.4 Defining Extended Module Displacements.............................46 4.5 Exercise: Extended Bump Travel...........................................46 5 - ADDITIONAL FEATURES 5.1 Overview ................................................................................49 5.2 Graph’s Scopes......................................................................50 5.3 Graphical measure.................................................................51 5.4 User Defined Results .............................................................52 5.5 Exercise: Producing a User Defined SDF ..............................54 5.6 Custom Control Box ...............................................................56 5.7 Set view units.........................................................................58 5.8 Standard SDF Scale and Shift Settings .................................59 5.9 Ini files....................................................................................60 5.10 Point Tolerances ....................................................................62 5.11 Component-setup Toolbox.....................................................65 6 - COMMAND REFERENCE CARD 7 - COMPLIANT ANALYSIS 7.1 Overview ................................................................................71 7.2 Introduction ............................................................................72 7.3 Enabling compliance calculation ............................................72 7.4 Bush Properties......................................................................74 7.5 Spring Properties ...................................................................78 7.6 Damper Properties .................................................................78 7.7 Tyre Properties.......................................................................79 7.8 External Forces ......................................................................79 7.9 Roll Bar Properties .................................................................84 7.10 Linear Rack Properties...........................................................85 7.11 Non-Linear Rack Properties...................................................86 7.12 Bump Stop Properties ............................................................86 7.13 Drive Shaft Torques ...............................................................87 7.14 Drive Shaft Losses .................................................................88 7.15 General Data..........................................................................88 7.16 Displaying compliance results................................................89 7.17 Solver Options........................................................................90 7.18 Exercise: Drive Shaft Forces..................................................92 8 - GRAPHICAL VIEW DISPLAY TOOL 8.1 Overview ................................................................................95 8.2 Introduction ............................................................................96 8.3 Simple Modes ........................................................................96 8.4 Single Step.............................................................................97 8.5 Deformed Geometry...............................................................97 8.6 Mode Shape...........................................................................98 8.7 Forced Damped .....................................................................98 8.8 Animation ...............................................................................98 8.9 Exercise: Using the Display Mode Tool..................................98 9 - USER FORMATTING RESULTS 9.1 Overview ..............................................................................101 9.2 Formatted SDF.....................................................................102 9.3 Spline Fits ............................................................................104 9.4 Spline Data...........................................................................105 9.5 Formatted Point Forces........................................................106 9.6 Compliance Text Values ......................................................108 9.7 Exporting..............................................................................109 9.8 Exercise: Example Formatted SDF ......................................112 10 - LOCAL COORDINATE SYSTEMS 10.1 Overview ..............................................................................115 10.2 Introduction ..........................................................................116 10.3 Creating a Local Coordinate System....................................117 10.4 Changing a point to use a Local Coordinate System ...........119 10.5 Exercise: Using a local coordinate system...........................120 11 - BALL JOINT RESULTS DISPLAY 11.1 Overview ..............................................................................121 11.2 Introduction ..........................................................................122 11.3 Setting the Displayed Point ..................................................123 11.4 Changing the Reference Axes .............................................123 11.5 Hard Copy............................................................................124 11.6 Auto-Centring.......................................................................124 12 - INTERNAL OPTIMISER 12.1 Overview ..............................................................................125