WS1-1 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 INTRODUCTION

WS1-2 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation

WS1-3 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation n Problem statement u In this workshop you will use a custom interface to solve a given problem. You need to determine the locations of joints in a mechanism so that a disk can be dropped at a desired angle. u The customized graphical user interface (GUI) can be used in several ways: l Move joint locations l Simulate l Animate l Calculate a value of interest l Optimize l Perform tolerance check u After using the interface provided, you will appreciate the advantages of a customized interface. WORKSHOP 1 - INTRODUCTION

WS1-4 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Model information u This model represents a disk transfer mechanism, as shown next.

WS1-5 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation n Disks are stacked in a bin and must be moved to a table. A series of links are constructed and driven by a pulley. The joint locations for each link must be determined so that the disk is oriented at a prescribed drop angle midway through its duty cycle. Throughout the cycle, it should neither strike the bin nor clash with the table. WORKSHOP 1 - INTRODUCTION

WS1-6 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation n Getting started To get started: 1. Start ADAMS/View from the exercise_dir/mod_01_intro directory. 2. Import the command file build.cmd. This will import the disk transfer model and the interface customizations. 3. From the View menu, select Revolve Model (custom menu button). Familiarize yourself with the model as it revolves about the y-axis of the view window. 4. Run a 1-second/50-step simulation to see how it operates. 5. Reset the model and select a front view. WORKSHOP 1 - INTRODUCTION

WS1-7 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Changing the design u In this section you will see how to change key locations of your mechanism. To change the model: 1. From the Disk Transfer menu, select Design Layout. 2. In the Design Layout dialog box, select the design point you want to modify. Observe the current x and y coordinates in the text boxes. 3. Use the + or - button to change the point location. Because the model is parameterized, all model dependencies update when you change these locations. Note: The buttons use increments of 2 mm per click.

WS1-8 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION 4. Watch the model change as you press these buttons. Note: If you move the points too far, you will encounter a hardcoded out-of-range error. 5. Reset your model to the original design by selecting Reset All. Leave the Design Layout dialog box open and continue with the next step.

WS1-9 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation n Simulating the model u Now you'll simulate the model to see how it behaves. To simulate the model: 1. From the Disk Transfer menu, select Simulate. 2. To simulate the current design configuration, make sure that Single is selected. 3. Select Apply. If you change the Model Display option menu from At Every Output Step to Never, the model solves faster, but does not update on the screen. Leave the Simulate dialog box open and continue with the next step. WORKSHOP 1 - INTRODUCTION

WS1-10 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Reviewing the results u Now you'll look at results of the simulation as an animation and a calculated value of interest. To review results: 1. From the Disk Transfer menu, select Review Results. 2. Select Animate to see the motion from your last simulation. It will also draw some animation traces of markers at the corners of the disk. Tip: If necessary, use the Stop button in the lower right corner of the screen to stop an animation before it has completed. 3. Select Reset in the Review dialog box when you're done animating.

WS1-11 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Determining the drop angle To automatically find the drop angle: 1. Select Actual Angle in the Review dialog box to determine the drop angle of the last simulated design. 2. What is the drop angle for the baseline design? _______________ 3. When you’re done, close the Information window. Leave the Review dialog box open and continue with the next step.

WS1-12 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n To manually find the drop angle: 1. Adjust the locations of points 1, 2, and/or 4 so that the resulting drop angle is approximately -2 degrees (relative to the table). Note: Visually verify that the disk does not clash with the table throughout its cycle. 2. Did you succeed at finding a drop angle of -2 degrees in three tries or less? _____ Yes, my angle was ___________________. _____ No, it was too difficult.

WS1-13 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Finding the drop angle using optimization u Now, you’ll perform an optimization study. During the optimization, ADAMS/View systematically varies the point locations and runs a number of simulations until the desired drop angle is achieved. To perform an optimization study: 1. Reset the point locations by selecting Reset All in the Design Layout dialog box. 2. In the Simulate dialog box, select Optimize and enter a Desired Drop Angle of -2 degrees. Select Apply to perform the optimization study. Note: We highly recommend that you set the Model Display option to At Simulation End to greatly speed up the individual simulations.

WS1-14 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION As the optimization runs, you may notice that the status bar updates with the iterations and passes used by the optimization algorithm. Please be patient, as this will take a few minutes. A strip chart will be displayed, indicating the progress the optimizer is making by plotting the objective versus iteration. Once the optimization study is completed, an optimization summary will be displayed in the Information window. 3. Which design variable coordinate had the largest percentage change from its initial value? ________________________________ 4. Which design variable coordinate had the smallest percentage change from its initial value? ________________________________

WS1-15 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION 5. What are the optimized variable values? 6. Close the Information window. 7. As a confirmation, perform a single simulation using the design configuration that the optimizer found. Compare the desired drop angle to the actual drop angle. 8. Was the optimization study successful? _____ Yes _____ No XY Point 1 Point 2 Point 3

WS1-16 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Performing a tolerance check u Next, you will see the effect of manufacturing tolerance on the drop angle. The optimized configuration will be considered the nominal value. To perform a tolerance check: 1. In the Simulate dialog box, select Tolerance Check. 2. Using a tolerance of 1 mm, perform a tolerance check for the variables that had the largest and smallest percent change from the optimization report (see steps 3 and 4 on previous slide). 3. Write down the value of the objective for each trial: -1 mmNominal+1 mm Point 4x (DV_p4_x) Point 2x (DV_p2_x)

WS1-17 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Special note u This workshop used the following capabilities of ADAMS/View: l A fully parameterized model l Design studies l Optimization studies l Custom menus l Custom macros l Custom dialog boxes u Throughout this course, these concepts and features (solutions) will be taught in detail. At the end of this course, you will be able to do this with your own virtual prototypes.

WS1-18 ADM , Workshop 1, August 2005 Copyright  2005 MSC.Software Corporation WORKSHOP 1 - INTRODUCTION n Optional tasks u Allow the disk to be dropped to the table during the simulation. Run a scripted simulation (by selecting Scripted Controls from the ADAMS/View Simulate menu), using.model_1.DROP_DISK_SCRIPT in the Simulation Script Name text box.