1Adams/Car Truck

Getting Started Using Adams/Car TruckThis document describes the Adams/Car Truck Plugin used to simulate the suspension and full-vehicle analyses using the shared truck database in Adams/Car MD Adams 2010.

• Load Truck Plugin

• Load Model

• Run the Suspension Analyses

• Run the Full Vehicle Analyses

Getting Started Using Adams/Car TruckLoad Truck Plugin

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Load Truck Plugin

To load Adams/Car Truck:

1. Start Adams/Car as explained in Starting Adams/Car Standard Interface in the section Getting Started Using Adams/Car.

2. From the Tools menu, select Plugin Manager. For help on the Plugin Manager, press F1 when the dialog box is active.

3. In the list of plugin names, find Adams/Truck, and then select one or both of the following:

• Load - Loads Adams/Car Truck in the current session.

• Load at Startup - Instructs Adams/Car to load Adams/Car Truck in all future Adams/Car sessions.

4. Select OK.

Adams/Car loads Adams/Car Truck.

3Adams/Car TruckLoad Model

Load ModelThere are four suspension and two full-vehicle assembly configurations which can be loaded.

To open the assembly:

1. From the File menu, point to Open, and then select Assembly.

2. Right-click the Assembly Name text box, point to Search, and then select <atruck_shared>/assemblies.tbl.

To create your own assembly

1. From the File menu, point to New.

2. Select Subsystem/Suspension_Assembly/Full_Vehicle_Assembly/Generic_Assembly from the menu.

The following table will familiarize you with the existing assemblies in the database:

msc_susp_front_leafs.asy

Consists: Steering, suspension and beam-leafspring subsystems

Testrig - MDI_SUSPENSION

msc_susp_front_3links.asy

Consists: Steering, suspension and 3link-leafspring subsystems

Testrig - MDI_SUSPENSION

msc_susp_driven_axle.asy

Consists: Front drive axle of tractor assembly

Testrig: MDI_SUSPENSION

Getting Started Using Adams/Car TruckLoad Model

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msc_susp_trailer_axle.asy

Consists: Front axle of trailer assembly

Testrig: MDI_SUSPENSION

msc_susp_bus_front.asy

Consists: Double wishbone suspension with antiroll bar, steer wheels and steering system

Testrig: MDI_SUSPESNION

msc_tractor_unit.asy

Consists: Front steer suspension, pair of drive axles, wheels, cab, powertrain and brake sub-assemblies

Testrig: MDI_SDI_TESTRIG

msc_tractor_semitrailer.asy

Consists: Front steer suspension, pair of drive & trailer axles, wheels, cab, powertrain, and brake sub-assemblies

Testrig: MDI_SDI_TESTRIG

msc_bus_rigid.asy

Consists: double wishbone suspension, rear drive axles, wheels, rigid chassis, powertrain and brake sub-assemblies

Testrig: MDI_SDI_TESTRIG

5Adams/Car TruckRun the Suspension Analyses

Run the Suspension AnalysesSelect the kind of analysis you want to perform using the available standard analyses or create loadcase file of your own and submit the analysis. You can view the results in the postprocessor. An example of wheel-travel analysis is given below.

Parallel Wheel-Travel AnalysisA wheel-travel analysis allows you to look at how the characteristics of a suspension change throughout the vertical range of motion of the suspension. You can perform three types of wheel-travel analyses. As a minimum, all wheel-travel analyses require a suspension subsystem. These analyses can also include a steering subsystem.

A parallel wheel-travel analysis keeps the left wheel and right wheel heights equal, while moving the wheels through the specified bump and rebound travel.

To set up a parallel wheel-travel analysis:

1. From the Simulate menu, point to Suspension Analysis, and select Parallel Wheel Travel.

2. Enter the necessary parameters in the dialog box as shown in the figure below.

3. Click OK.

Getting Started Using Adams/Car TruckRun the Full Vehicle Analyses

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Run the Full Vehicle AnalysesCreate a generic assembly or open the tractor or tractor_semitrailer assembly to perform a full vehicle analysis. A suggested event is given below.

Static• From the Simulate menu, point to Full-Vehicle Analysis, point to

Static_and_Qstatic_Maneuvers, and select Static_Equilibrium:

• none, normal, settle

• straight (60mph, 6th gear)

• skidpad (60m radius, .2g, 4th gear), (100m radius, .1g, 4th gear for Tractor&Trailer)

Open-Loop Steering Events• From the Simulate menu, point to Full-Vehicle Analysis, and select Open-Loop Steering

Events:

• step steer (5s, 60mph, 6th gear, 45deg, .5s start time, .5s step duration, angle input, qss)

• swept steer (10s, 45mph, 6th gear, 90d, .2Hz initial, 3Hz max, .2Hz/s rate, 0s start time, angle input, cruise control, qss)

• ramp steer (10s, 35kph, 2nd gear, 20deg/s, 0s start time, angle input, cruise control, qss)

• impulse steer (5s, 60mph, 6th gear, 45deg, .5s start time, .5 step duration, angle input, qss)

• drift (15s, 60mph, 6th gear, initial throttle 50, throttle ramp 10, steer angle 0, qss)

• fishhook (45mph, 6th gear, first steer angle 45deg, .5s step, .5s duration, 2nd steer angle 90deg, .75s step, 2s duration, qss)

• DCF data-driven

Straight-Line Events• From the Simulate menu, point to Full-Vehicle Analysis, and select Straight-Line Events:

• open-loop acceleration (10s, 500 steps, 35kph, start .5s, final throttle 100, .5s step time, 2nd gear, straight-line steering, shift gears, qss)

• closed-loop acceleration (10s, 500 steps, 35kph, start .5s, 0.05g, 2nd gear, straight-line steering, qss)

• open-loop braking (5s, 500 steps, 60mph, start .5s, final brake 80, 1s duration, 6th gear, straight-line steering, qss)

• closed-loop braking (5s, 500 steps, 60mph start .5s, .5g, 6th gear, straight-line steering, qss)

7Adams/Car TruckRun the Full Vehicle Analyses

Closed-Loop Cornering• From the Simulate menu, point to Full-Vehicle Analysis, and select Open Loop Steering

Events:

• dynamic constant radius

with static setup (4th gear, 60m radius, .2g initial, .25g final, 10sec duration for Tractor)

without static setup (40m entry, 3sec settle time)

• braking-in-turn (4th gear, .2g lateral, 85m radius, maintain radius, .2g decel, 5s duration, qss)

• quasi-static constant radius (.4g and 85m radius)

Getting Started Using Adams/Car TruckRun the Full Vehicle Analyses

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