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  3. How the brake torque is computed in brake_system_4Wdisk

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How the brake torque is computed in brake_system_4Wdisk

jozef.bucha
jozef.bucha over 1 year ago

Hello how is the Point-Torque computed in template brake_system_4Wdisk in acarshared database?

i.e. Point torque for left front actuator is defined:

2.0*pvs_front_piston_area

*IF(pvs_brake_reduction:0,pvs_front_brake_left_side_bias,left_reduction)

*pvs_front_brake_bias

*VARVAL(cis_brake_demand_adams_id)

*demand_to_authority_scale

*force_to_pressure_cnvt

*pvs_front_brake_mu

*pvs_front_effective_piston_radius

*STEP(VARVAL(left_front_wheel_omega),-velocity_step_threshold,1,velocity_step_threshold,-1)

with units involved according parameter variables and variables:

2.0*pvs_front_piston_area [mm2]

*IF(pvs_brake_reduction:0,pvs_front_brake_left_side_bias,left_reduction) [-]

*pvs_front_brake_bias [-]

*VARVAL(cis_brake_demand_adams_id) [%]

*demand_to_authority_scale [-]

*force_to_pressure_cnvt [-]1/mm2

*pvs_front_brake_mu [-]

*pvs_front_effective_piston_radius [mm]

*STEP(VARVAL(left_front_wheel_omega),-velocity_step_threshold,1,velocity_step_threshold,-1)

force_to_pressure_cnvt is defined as unitless, but force_to_pressure_cnvt=(0.1(1/mm**2))

Adams Car Help says:

As far as I know brake demand is used as percentage value, not force.

also in help is written:

but in template pvs_max_brake_value is defined as Force

Thanks for reply

Jozef

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  • Shwetark Saraf
    Shwetark Saraf over 1 year ago

    - For the standard brake template:

    The force_to_pressure_cnvt value=0.1, units=1/mm2

    The demand_to_authority units should be force(N), so pressure units are N/mm2 = MPa

    The brake demand variable value is 0-100

    So, the default pressure at max demand is bias*100*1*0.1=bias *10 MPa

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