SWIFT® Evo Wheel Force Transducers

SWIFT Evo transducers achieve unparalleled measurement accuracy and long life by employing a high-stiffness, one-piece design machined from a forged billet of certified AMS high strength, high toughness aluminum or titanium alloy.

Unique among wheel force transducers, this proven design yields high sensitivity, excellent linear behavior, and high overload capacity. The transducers’ high natural frequency provides phase integrity between measured channels across the operating frequency range.

With no bolted joints, the one-piece design eliminates micro-slippage - the largest contributor to hysteresis - and facilitates efficient heat transfer across the sensor, minimizing temperature differentials in gaged areas.

The one-piece design also minimizes the number of required gages, which enhances transducer reliability and robustness.

A patented MTS flexure isolated shear beam decouples the transducer’s six components of measurement to reduce cross-coupling between measured axes. This increases transducer sensitivity to minute forces and moments and minimizes thermal response.

The one-piece outer ring and shear beam combine to make the SWIFT Evo insensitive to variations in stiffness among wheel rims and road simulator fixtures, facilitating easier integration with both.

SWIFT Evo transducers are testedto SAE J267 and J328 requirements, assuring a long life when properly maintained. Sealed to IP67 standards, they are virtually weather and contaminant proof.

SWIFT Evo transducers are fatigue rated, so the same unit can be deployed on a vehicle at the proving ground for RLDA and then in the lab for both drive file iteration and actual durability testing if desired.

Download the CAD files (.step) below to explore how the robust, one-piece transducer design manifests across the SWIFT Evo portfolio – aluminum (a) and titanium (t).

10a

10t

20a

20t

30a

30t

40a

The measurement accuracy of SWIFT Evo transducers is ensured through a multi-axial calibration process provided exclusively by MTS Metrology & Calibration.

While most wheel force transducers are calibrated one channel at a time, SWIFT Evo units are subject to a meticulous, automated process that calibrates the entire transducer, cycling through each channel while exciting all others. This approach enables precise measurements of cross-coupling coefficients under far more realistic loading conditions.

The calibrated SWIFT Evo wheel force transducer is capable of yielding data that can be shared across units with very high fidelity. This affords the flexibility to dedicate specific units for RLDA, drive file generation or durability testing, while maintaining data integrity across the process.

Max Calibrated Load Ratings

10Al

10Ti

20Al

20Ti

30Al

30Ti

40Al

40Ti

Longitudinal force (Fx)

kN

12

20

21

30

28

50

40

60

lb

2,643

4,400

4,721

6,744

6,295

11,240

8,992

13,489

Lateral force (Fy)

kN

7

12

16

25

23

40

30

45

lb

1,540

2,640

3,597

5,620

5,171

8,992

6,744

10,116

Vertical force (Fz)

kN

12

20

21

30

28

50

40

60

lb

2,643

4,400

4,721

6,744

6,295

11,240

8,992

13,489

Overturning moment (Mx)

kN-m

1.6

3

4

6

5

9

9

15

lb-ft

1,180

2,235

2,950

4,425

3,688

6,638

6,638

11,063

Driving/braking moment (My)

kN-m

2.2

3.5

5

8.5

7.5

13

13

20

lb-ft

1,612

2,565

3,687

6,269

5,532

9,588

9,588

14,751

Steering moment (Mz)

kN-m

1.6

3

4

6

5

9

9

15

lb-ft

1,180

2,235

2,950

4,425

3,688

6,638

6,638

11,063

Noise Level peak-to-peak (0-500 Hz)

N

4

6

4

6

3

5

4

6

Max Usable RPM*

RPM

2400

2400

2400

2400

2400

2400

2400

2400

Max Operating Temperature

°C

125

125

125

125

125

125

125

125

°F

257

257

257

257

257

257

257

257

Shock Resistance Each Axis

G

60

60

60

60

60

60

60

60

Environmental Protection Rating

IP67

IP67

IP67

IP67

Input Voltage Required

VDC

10-28

10-28

10-28

10-28

Input Power Required per Transducer

W

6

6

6

6

Output Voltage Full Scale Calibrated Load

VDC

±10

±10

±10

±10

SAE J328 Half Axle Rating

kg

438

717

662

1,089

1,225

2,313

lb

965

1,580

1,460

2,400

2,700

5,100

SAE Bending Moment seen on cell

kN-m

1.45

4.76

3.1

4.5

4.8

8.0

9.5

15.5

lb-ft

1,072

3507

2,305

3,292

3,544

5,893

6,977

11,466

Specification %
(Typical Performance %) **

10Al

10Ti

20Al

20Ti

30Al

30Ti

40Al

40Ti

Nonlinearity

Force

%FS

0.4 (0.2)

0.4 (0.2)

0.3 (0.15)

0.3 (0.15)

0.2 (0.15)

0.2 (0.15)

0.3 (0.15)

0.3 (0.15)

Moment

%FS

0.7 (0.2)

0.7 (0.2)

0.5 (0.2)

0.5 (0.2)

0.3 (0.2)

0.3 (0.2)

0.5 (0.2)

0.5 (0.2)

Hysteresis

Force

%FS

(0.2) 0.2

(0.2) 0.2

(0.1) 0.2

(0.1) 0.2

(0.1) 0.2

(0.1) 0.2

(0.1) 0.2

(0.1) 0.2

Moment

%FS

(0.2) 0.5

(0.2) 0.5

(0.2) 0.3

(0.2) 0.3

(0.2) 0.3

(0.2) 0.3

(0.2) 0.3

(0.2) 0.5

Crosstalk

Fy → Fx, Fz

%FS

0.6 (0.2)

0.6 (0.2)

0.4 (0.25)

0.4 (0.25)

0.25 (0.2)

0.25 (0.2)

0.2 (0.2)

0.2 (0.2)

Fx ←→ Fz

%FS

0.6 (0.2)

0.6 (0.2)

0.5 (0.25)

0.5 (0.25)

0.3 (0.2)

0.3 (0.2)

0.3 (0.2)

0.3 (0.2)

Fx, Fz → Fy

%FS

0.5 (0.2)

0.5 (0.2)

0.5 (0.3)

0.5 (0.3)

0.4 (0.2)

0.4 (0.2)

0.25 (0.2)

0.25 (0.2)

Assembly Information

10Al

10Ti

20Al

20Ti

30Al

30Ti

40Al

40Ti

Transducer

kg

1.2

1.9

3.1

4.8

4.3

6.3

8.5

12.4

lb

2.7

4.2

6.8

10.6

9.4

13.9

18.8

27.3

Min Rim Size

mm

177.8

177.8

304.8

304.8

330.2

330.2

381

381

in

7

7

12

12

13

13

15

15

Typical Lug Nut Bolt Circle

mm

All

Up to 120

Up to 120

Up to 170

Type Connector Output

BNC

BNC

BNC

BNC

Auto Shunt Calibration

on vehicle or test rig

Modal Properties: Frequency

10Al

10Ti

20Al

20Ti

30Al

30Ti

40Al

40Ti

With Tire & Rim

Mx, My

Hz

325

385

425

470

480

Fy

Hz

610

675

765

740

770

Without Tire & Rim

My Mx,

Hz

980

845

810

810

775

Fy

Hz

1,575

1,255

1,445

1,490

1,570

SWIFT Evo wheel force transducers achieve unparalleled measurement accuracy and long life by employing a high-stiffness, one-piece design machined from a forged billet of certified AMS high strength, high toughness aluminum or titanium alloy.

Download the CAD files (.step) below to explore how the robust, one-piece transducer design manifests across the SWIFT Evo portfolio – aluminum (a) and titanium (t).

10a

10t

20a

20t

30a

30t

40a

40t