HEAVY TRUCK CALCULATION WORKSHEET PUSHROD FORCE DETERMINATION SHEET 1 OF 3 CASE NO.:_________________ INVESTIGATOR:______________________________ DATE:_____________________ LOCATION:______________________________COMPANY_________________ 1 Measured Stroke AXLE / WHEEL 2 Brake Temp 3 Heat Incr 4 Hot Stroke 1 +3 5 Dyn Incr 6 Dyn Stroke 1+3+5 7 Type (Size) 8 Appl Air 9 Pushrod Force (from chart) 1-Steer Lft 1-Steer Rt 2-Drive-Lft 2-Drive-Rt 3-Drive-Lft 3-Drive-Rt 4-Trl A-Lft 4-Trl A-Rt 5-Trl A-Lft 5-Trl A-Rt 6-Trl B-Lft 6-Trl B-Rt 7-Trl B-Lft 7-Trl B-Rt NOTES: o o o o Dynamic Increment = 0.05 + (0.034 x Time) Temperature increment can be figured from formulas. Air pressures should reflect what was applied at the moment of braking. (This value should consider leaks, etc.) Pushrod force values should be read from the charts. HEAVY TRUCK CALCULATIONS WORKSHEETS Sheet 2 of 3 BRAKE FORCE CALCULATIONS – S-CAM CASE NO.__________________ INVESTIGATOR:______________________________________________DATE:_____________________ Location: ____________________________Company:____________________________ Brake Force: [ 2.0 x Pushrod Force x SlackL x LiningF x Drum Rad] x 0.6 ] (0.5) x Tire Rolling Rad NOTES: o Pushrod Force found on charts looking up stroke and pressure. o Stroke should have an Increment added to it based on estimated speed: o 30mph - 0.13 in., 40 mph - 0.16 in., 50 mph - 0.19in., 60 mph - 0.22 in. o Stroke can also be adjusted for heat (Done before dynamic increment added) AXLE/WHEEL 1-Steer Lft 1-Steer Rt 2-Drive-Lft 2-Drive-Rt 3-Drive-Lft 3-Drive-Rt 4-Trl A-Lft 4-Trl A-Rt 5-Trl A-Lft 5-Trl A-Rt 6-Trl B-Lft 6-Trl B-Rt 7-Trl B-Lft 7-Trl B-Rt Pushrod Force Slack Length Lining Friction Drum Radius Tire Roll Radius Attempted Brake Force HEAVY TRUCK CALCULATION WORKSHEETS BRAKE EFFICIENCY CALCULATIONS SHEET 3 OF 3 CASE NO._______________ INVESTIGATOR:______________________________________________DATE:__________________ LOCATION:___________________________________COMPANY:____________________________ AXLE/WHEEL 1 Vertical Load 2 Available Brk Force F* x Load(1) 3 Attempted Brk Force Other pg. 4 Smaller of Column 2 or 3 Locked Wheel Yes/No 1-Steer Lft 1-Steer Rt 2-Drive-Lft 2-Drive-Rt 3-Drive-Lft 3-Drive-Rt 4-Trl A-Lft 4-Trl A-Rt 5-Trl A-Lft 5-Trl A-Rt 6-Trl B-Lft 6-Trl B-Rt 7-Trl B-Lft 7-Trl B-Rt TOTAL LOAD:_____________________________ BRAKING FORCE:_________________________ (TOTAL COLUMN #4) Vehicle Deceleration Rate = Braking Force / Total Load = __________________________________ TOTAL EFFICIENCY = Decel Rate / Coef of Friction = ________________________________ Passenger Car Tire-Road Coef of Friction________ x Factor for Truck Tire_______ =______________ *F = Truck Tire-Road Coef of Friction = _________ (Use in Column # 2)
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