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Multibody systems simulation software 129 Fig. 3.44 ADAMS/Chassis user interface (provided courtesy of MSC.Software) (ii) The Standard User mode is intended for design, test and development engineers in addition to analysts. These users would not necessarily be MSC.ADAMS experts but would be able to use the existing templates to enter data and create models using familiar terminology. In parallel to ADAMS/Car the ADAMS/Chassis system is also used for vehicle work and offers similar capability. The ADAMS/Chassis program was originally developed in-house by Ford in the late 1980s. The program was originally called ADAMS/Pre and as the name suggests the early implementation was a pre-processor that automatically formatted ADAMS data sets. In its current form it has additional capability to run customized simulations and has its own post-processor. Ford allowed the program to be taken on and developed by another company before the product was acquired by the developers of MSC.ADAMS. Due to its origin ADAMS/Chassis appears on the surface unlike any of the other customized MSC.ADAMS programs. The program uses a graphical interface based more on data forms to enter the data. An example is shown in Figure 3.44. The program also requires a high level of programming skill on the part of any expert user who is going to customize or develop the way models are generated, simulations are run or results are plotted and reported. In addition to vehicle dynamics knowledge the ADAMS/Chassis expert would need a working knowledge of ADAMS/Solver language, C and FORTRAN in order to perform any meaningful customization. It is perhaps fortuitous that the program offers a good range of suspension systems in the current implementation. Once the full vehicle is assembled there exists a range of pre-programmed manoeuvres that may be selected and simulated. Examples are listed here in Table 3.7 using the terminology particular to ADAMS/Chassis to name the manoeuvres.

130 Mutibody Systems Approach to Vehicle Dynamics Table 3.7 Full vehicle manoeuvres implemented in ADAMS/Chassis • Brake-in-turn • Brake drift • Constant radius • Cross wind • Frequency response • J-turn • Lane change • On center handling • Parking effort • Steady state drift • User defined event • Straight line acceleration • Straight line deceleration • Straight line drive • Step steer • Static vehicle characteristics (SVC) • Swept steer • Low G swept steer • Throttle-off-in-turn • Throttle-on-in-turn • Tire wear Table 3.8 ADAMS/Car calculated suspension outputs • Ackerman • Ackerman angle • Ackerman error • Percent Ackerman • Anti-dive • Anti-lift • Camber angle • Camber compliance • Caster angle • Caster moment arm • Caster moment arm • Dive • Fore-aft stiffness • Front swing-arm angle • Front swing-arm length • Ideal steer angle • King pin inclination angle • Lateral camber compliance • Lateral deflection compliance • Lateral steer compliance • Lift • Outside turn diameter • Ride rate • Ride steer • Roll angle • Roll camber coefficient • Roll center height • Roll steer • Scrub radius • Side angle • Side swing-arm angle • Side swing-arm length • Spindle vector • Steer angle • Suspension roll rate • Toe angle • Total roll rate • Turn radius • Wheel load • Wheel rate • Wheel travel Both ADAMS/Car and ADAMS/Chassis include a substantial list of preprogrammed suspension outputs that can be automatically calculated and reported to the user. Examples are provided in Table 3.8. It is perhaps in the calculation of outputs such as these that the customized software offers a significant benefit to the analyst. The next chapter will consider some of the more significant outputs listed in Table 3.8. Examples will be provided showing how, for example, a geometric roll centre can be located programming equations from first principles.

130 Mutibody Systems Approach to Vehicle Dynamics<br />

Table 3.7<br />

Full vehicle manoeuvres implemented in ADAMS/Chassis<br />

• Brake-in-turn<br />

• Brake drift<br />

• Constant radius<br />

• Cross wind<br />

• Frequency response<br />

• J-turn<br />

• Lane change<br />

• On center handling<br />

• Parking effort<br />

• Steady state drift<br />

• User defined event<br />

• Straight line acceleration<br />

• Straight line deceleration<br />

• Straight line drive<br />

• Step steer<br />

• Static vehicle characteristics (SVC)<br />

• Swept steer<br />

• Low G swept steer<br />

• Throttle-off-in-turn<br />

• Throttle-on-in-turn<br />

• Tire wear<br />

Table 3.8<br />

ADAMS/Car calculated suspension outputs<br />

• Ackerman<br />

• Ackerman angle<br />

• Ackerman error<br />

• Percent Ackerman<br />

• Anti-dive<br />

• Anti-lift<br />

• Camber angle<br />

• Camber compliance<br />

• Caster angle<br />

• Caster moment arm<br />

• Caster moment arm<br />

• Dive<br />

• Fore-aft stiffness<br />

• Front swing-arm angle<br />

• Front swing-arm length<br />

• Ideal steer angle<br />

• King pin inclination angle<br />

• Lateral camber compliance<br />

• Lateral deflection compliance<br />

• Lateral steer compliance<br />

• Lift<br />

• Outside turn diameter<br />

• Ride rate<br />

• Ride steer<br />

• Roll angle<br />

• Roll camber coefficient<br />

• Roll center height<br />

• Roll steer<br />

• Scrub radius<br />

• Side angle<br />

• Side swing-arm angle<br />

• Side swing-arm length<br />

• Spindle vector<br />

• Steer angle<br />

• Suspension roll rate<br />

• Toe angle<br />

• Total roll rate<br />

• Turn radius<br />

• Wheel load<br />

• Wheel rate<br />

• Wheel travel<br />

Both ADAMS/Car and ADAMS/Chassis include a substantial list of preprogrammed<br />

suspension outputs that can be automatically calculated and<br />

reported to the user. Examples are provided in Table 3.8.<br />

It is perhaps in the calculation of outputs such as these that the customized<br />

software offers a significant benefit to the analyst. The next chapter will<br />

consider some of the more significant outputs listed in Table 3.8. Examples<br />

will be provided showing how, for example, a geometric roll centre can be<br />

located programming equations from first principles.

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