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Car Ride 2014

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ADAMS

Text of Car Ride 2014

  • Welcome to Adams/Car Ride

  • Adams/Car Ride36

    Introduction

    IntroductionAdams/Car Ride, part of the Adams 2014 suite of software, is a plugin to Adams/Car. You can use Adams/Car Ride to model and simulate the ride quality of ground vehicles. It contains modeling elements important for ride quality that you can use in Adams/Car models. You can also analyze the modeling elements independently from other systems using a modeling-element test rig.

    In addition, Adams/Car Ride includes a four-post test rig for four-wheeled Adams/Car vehicle models. The four-post test rig supports a variety of time-domain analyses, as well as frequency-domain analyses with Adams/Vibration.

    About Adams/Car RideUsing Adams/Car Ride, you can quickly create Adams/Car assemblies of suspensions and full vehicles, including Adams/Car Ride-provided components important for ride quality, and then analyze them to understand their performance and behavior.

    The Adams/Car Ride components are: Monroe damper Hydromount Frequency-dependent bushing

    You can analyze each component independently from other systems using a component test rig. You can also use a parameter identification tool for the hydromount component, to quickly determine model parameters that will accurately reproduce test data.

    Using the Adams/Car Ride four-post test rig for four-wheeled Adams/Car vehicle models you can simulate a vehicle traveling over a rough road or simulate a vehicle on a real four-post shaker test machine. You can play displacement or force RPC III file data into the test rig, make your own bumps with table-lookup functions and drive over them, or create and drive over a road-profile surface using a mathematical model for generating road roughness. In the time domain, the four-post test rig also supports sinusoidal sweeps (displacement, velocity, acceleration, or force) and arbitrary Adams/Solver functions.

    Learn more about Referencing Test Data.

    Benefits of Adams/Car RideAdams/Car Ride enables you to work faster and smarter, letting you have more time to study and understand how design changes affect vehicle performance.

    Using Adams/Car Ride you can: Explore the performance of your design and refine your design before building and testing a

    physical prototype.

  • 37Welcome to Adams/Car Ride

    Introduction

    Analyze design changes much faster and at a lower cost than physical prototype testing would require. For example, you can change springs with a few mouse clicks instead of waiting for a mechanic to install new ones in your physical prototype before re-evaluating your design.

    Vary the kinds of analyses faster and more easily than if you had to modify instrumentation, test fixtures, and test procedures.

    Work in a more secure environment without the fear of losing data from instrument failure or losing testing time because of poor weather conditions.

    Run analyses and what-if scenarios without the dangers associated with physical testing. Perform a repeatable set of tests on a global basis, ensuring that you work with common data,

    tests, and, most important, results.

    Starting Adams/Car RideBecause Adams/Car Ride is a plugin to Adams/Car, you first start Adams/Car and then load Adams/Car Ride.

    In the Windows environment, you start Adams/Car from the Start button. In the Linux environment, you start Adams/Car from the Adams Toolbar. For information, see the Running and Configuring online help.

    To start Adams/Car Ride:1. Start Adams/Car as explained in Starting Adams/Car. 2. From the Tools menu, select Plugin Manager.3. In the list of plugin names, find Adams/Car Ride, and then select one or both of the following:

    Load - Loads Adams/Car Ride in the current session. Load at Startup - Instructs Adams/Car to load Adams/Car Ride in all future Adams/Car

    sessions.4. Select OK.

    Adams/Car loads Adams/Car Ride. The interface now includes a new menu, Ride.

  • Adams/Car Ride38

    Running Analyses

    Running Analyses

    Introducing AnalysesAdams/Car Ride allows you to create virtual prototypes of vehicle subsystems, and analyze the virtual prototypes much like you would analyze the physical prototypes.

    Using Adams/Car Ride to analyze a virtual prototype is much like requesting a test of a physical prototype. When testing in Adams/Car Ride, you specify the following:

    The virtual prototype to be tested - You specify the virtual prototype by opening or creating an assembly that contains the appropriate components, or subsystems, that make up the prototype. For example, you create a full-vehicle assembly containing suspension, steering, body, brakes, wheels, and so on.

    The kind of Analysis you'd like performed - Depends on the type of model and test rig that you have opened. You can perform analyses of components (using the component test rig), fourpost and vibration analyses (using the fourpost test rig).

    The analysis inputs to be used - You specify the inputs to the analysis by typing them directly into an analysis dialog box or by selecting a loadcase file that contains the desired inputs from an Adams/Car Ride database. Learn about Loadcase Files.

    After specifying the prototype assembly and its analysis, Adams/Car Ride, like your companys testing department, applies the inputs that you specified and records the results. To understand how your prototype behaved during the analysis, you can plot the results. After viewing the results, you can modify the prototype and analyze it again to see if your modifications improved its behavior.

    Each kind of analysis that you perform requires a minimum set of subsystems. For example, a full-vehicle analysis requires front and rear suspension subsystems, front and rear wheel subsystems, one steering subsystem, and one body subsystem. Before you can create an assembly and perform an analysis in Adams/Car Ride, you must open or create the minimum set of subsystems required.

    Setting up Component AnalysesYou can use a component analysis to calculate the dynamic stiffness and loss angle of a frequency-dependent bushing or damper.

    To set up a component analysis:1. From the Ride menu, point to Component Analysis, and then select Component-Model Test

    Rig.2. Press F1 and then follow the instructions in the dialog box help for Component Analysis.3. Select OK.

  • 39Welcome to Adams/Car Ride

    Running Analyses

    Setting up Full-Vehicle AnalysesYou can use a full-vehicle analysis to investigate a car's ride-quality characteristics.

    To set up a full-vehicle analysis:1. From the Ride menu, point to Full-Vehicle Analysis, and then select Four-Post Test Rig.2. Press F1 and then follow the instructions in the dialog box help for Full-Vehicle Analysis:

    ARIDE_FOUR_POST_TESTRIG.3. Select OK.

    Setting up Full-Vehicle Vibration AnalysesYou can use a full-vehicle vibration analysis to analyze the behavior of your linearized vehicle model in the frequency domain. This includes analyses of vibration transmission frequency responses, natural frequencies, mode shapes, and damping ratios.

    To set up a vibration full-vehicle analysis:1. From the Ride menu, point to Full-Vehicle Vibration Analysis, and then select Four-Post Test

    Rig.2. Press F1 and then follow the instructions in the dialog box help for Full-Vehicle Vibration Analysis:

    ARIDE_FOUR_POST_TESTRIG.3. Select OK.

    Controlling Analysis Output FilesYour template-based product lets you control the type and content of files an analysis outputs. You can specify whether an analysis outputs a graphics file or results file. Graphics files contain time-dependent data describing the position and orientation of each part in the model. Results files contain a basic set of state variable information that Adams/Solver calculates during a simulation.

    Your template-based product automatically reads the files that an analysis outputs.

    If any subsystems within the assembly being analyzed contain flexible bodies, your template-based product automatically outputs a results file, regardless of the specifications you made.

    To specify analysis output files:1. From the Settings menu, point to Solver, and then select Output Files.

    The Output Files dialog box appears.2. Select the types of files you want to output.3. Select OK.

  • Adams/Car Ride40

    Running Analyses

    Setting up Full-Vehicle A2N Analyses (A2N Export)You can use a full-vehicle a2n analysis for exporting Adams linearized model to Nastran as a whitebox or blackbox. In blackbox, Mass, Stiffness and Damping matrices of your linearized vehicle model are exported in order to provide a Modal and/or Frequency Response Analysis in the FE code. While in whitebox, the linearized model is exported as element to element. Referring to Adams/Vibration help for full details, using Adams/Vibration - Adams2Nastran (A2N Export) feature, you can define the operating point at which you want to export linearized model as whitebox or blackbox and then performing Nastran modal or frequency response analysis: the operating point has been achieved running Adams/Solver, taking into account all the nonlinearities of the system and with the possibility to easily change any parameter or variable for exploring different model configuration and, consequently, to easily recreate full Nastran equivalent model. In blackbox, the Mass, Stiffness and Damping matrices are exported as Nastran DMIG and connected to the system using MPC (Multi Point Constraint) while the location of input channels and output channels (Adams Markers) are exported as Nastran GRIDs and generalized degrees of freedom as SPOINTs.

    The feature is limited in the sense that A2N input and output channels are automatically created, located and defined and the user

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