DynoCal Technical Specifications
Note:
These are specifications for the version delivered to BAR. Variations on these specifications are possible.
General Ratings
Continuous power 67 hp at 47-70 mph
35 hp at 25 mph
21 hp at 15 mph
Continuous force at wheel surface 534 lb-force
Peak force at wheel surface 664 lb-force
Maximum speed 70 mph
Mechanical Equipment
Drive wheels Automobile tires
Wheel preparation Tread removed
DynoCal width (outside of wheels) 53 in
DynoCal width (inside of wheels) 38 in
DynoCal width (outside of frame) 65 in
Bearing type Spherical roller
Bearing life 50,000 hrs
Mechanical inertia (nominal) 75 lbs
Accuracy/Resolution
Time base accuracy ± 0.05 %
Force measurement accuracy ± 0.1 % of full scale
Speed measurement accuracy ± 0.05 mph
DynoCal inertia repeatability ± 4 lbs
DynoCal response ± 2% of commanded torque within 150 ms
Torque Sensors
Transducer type Strain-gauge load cell
Range ± 1,000 lbs
Accuracy ± 0.1 of full scale
Roll Speed Measurement
Method Fifth wheel encoder
Nominal diameter 11.459 in
Encoder transducer type Optical encoder, quadrature
Resolution 0.004 mph
Encoder Lines 12,500 direct
Pulses 50,000 ppr (with quadrature)
DynoCal Speed Measurement
Method Motor shaft encoder
Encoder transducer type Optical encoder
Resolution 0.08 mph
Encoder Lines 1,024 per rev
Pulses 1,024 per rev
Utilities and Power
DynoCal motor batteries 312 VDC nominal
Chargers 230 V, single-phase, 30 A
Computer and I/O Buffer Box 115 V, 5 A, clean power
Shop Air Not required
DynoCal motor cooling Not required
Batteries/chargers cooling Fans provided
Battery Chargers
Nominal output 24 VDC, 8 A
Input power 230/115 VAC, 1.8/3.6 A, 50-60 Hz
Weight (each) 16 lbs
Number used 13
Charging time from 50% discharge 5-6 hrs
Batteries
Manufacturer Hawker Energy Products
Model No. G12V38AH10VP
Type Sealed lead-acid, maintenance-free,
negligible gassing
Capacity (10 hr rate) 38 Amp-hrs
Dimensions (each) 6.53" long, 7.78" wide, 6.72 " high
Weight (each) 35 lbs
Number used 26 batteries
Cycle life at 25°C:
15 min rate 300 for 80% DOD and 2.45 vpc charge for 16-24 hrs
3-5 hr rate 500 for 80% DOD and 2.45 vpc charge for 16-24 hrs
Operating temperature range -40°C to +60°C
DynoCal Motor
Manufacturer Baldor Electric
NEMA frame size 405TZ
Nameplate hp 67
Nameplate volts 240 V
Nameplate speed 585 rpm
Nameplate frequency 30 Hz
Temperature rating 40 °C above ambient (30 min)
Dimensions and Weight
Trailer dimensions (nominal) 7 ft by 12 ft
Trailer dimensions (actual) 188" L, 94" W, 103" H
DynoCal tester weight 1,700 lbs
Trailer weight without tester 3,800 lbs
Trailer weight with tester 5,500 lbs