The paper presents a new family of sensors that can be produced at a relatively low cost and that can measure the 3 forces and 3 moments acting at a point of a structure. The final aim of the research work is to develop measuring hubs and general purpose 6-axis load cells able to enhance the active safety of vehicles by providing information on forces and moments acting at the tyre/suspension system or on different vehicle subsystems, in the low frequency range (up to 100 Hz). Measuring hubs and general purpose 6-axis sensors have been manufactured and tested. The paper presents the concept, the construction issues and the performances of such devices. All of the presented measuring devices are based on a special statically determined structure. Twelve strain gauges measure the deformations at special locations and six signals (linearly related to the forces and moments) are filtered, amplified and digitally converted before they are stored or transmitted to a remote receiver. The sensitivity and the accuracy of such measuring devices are sufficient to exploit them to enhance the active safety of road vehicles.

1.
Gobbi M., Mastinu G., “Wheels with Integrated Sensors for Measuring Tyre Forces and Moments,” AVEC Conference, 2004.
2.
Gobbi M., Aiolfi M., Pennati M., Previati G., Levi F., Ribaldone M., Mastinu G., “Measuring forces and moments acting at a farm tractor pneumatic tyres,” 2004.
3.
Gobbi, M., Mastinu, G., Billi, G., Aiolfi, M., “Multiaxis generalized forces (forces and moments) sensor for vehicle tire,” (in Italian), Proc. of the XXXII AIAS Conference, Salerno, 2003.
4.
Berme N., “Multi-component force and moment measuring platform and load transducer,” (Bertec Corporation), Patent US6354155, 2002.
5.
Bicchi A., “A criterion for optimal design of Multiaxis Force Sensors,” Journal of Robotics and Autonomous Systems, 10 (4), 1992.
6.
Byun Y., et Al, “Parallel type six-axes force moment measuring apparatus,” (Samsung Electronics Co., Ltd.), Patent US6349604, 2002.
7.
Carignan F., et Al, “Force measuring platform and load cell using strain gages to measure shear forces,” (Advanced Mechanical Technology, Inc.), Patent US4493220, 1985.
8.
Cook N., et Al., “Multi-axis wheel transducer with angular position detector,” (Advanced Mechanical Technology, Inc.) Patent, US5886350, 1999.
9.
Dukart A., et Al., “Measuring arrangement in the wheel bearing of motor vehicles for detecting forces and moments,” (ROBERT BOSCH GMBH), European Patent, EP1225451A1, 2002.
10.
Engeler P., et Al., “Multicomponent force and moment measuring arrangement,” (K.K. Holding AG), US5402684, 1995.
11.
Itoh H., Oida A., and Yamazaki M., “Measurement of Forces Acting on 4WD-4WS Tractor Tyres During Steady State Circular Turning in a Rice Field,” Journal of Terramechanics, Vol. 32, 1995.
12.
Lerat B., “Transducer for bending and twisting moments,” (Commissariat A L’Energie Atomique), Patent US4879913, 1989.
13.
Meyer R., et Al., “Six Axis Load Cell,” (MTS SYSTEMS CORPORATION), European Patent EP0632884B1, 1998.
14.
Potts G., et Al, “Dynamic force measurement system for tire testing station,” (BRIDGESTONE / FIRESTONE, INC.), Patent WO 0204906A1, 2002.
15.
Siedler A., et Al., “Force and/or moment measuring device” (K.K. Holding AG), Patent US5821432, 1998.
16.
Spa¨t R., “Sensor wheel for recording wheel forces at the tractor rear axle,” Landtechnik, 56 (5), 2001.
17.
Velos Meßsysteme, “VELOS wheel force transducer,” http://www.velos-wft.de/WFT/wft.html, 2003.
18.
Doebelin E.O., “Measurement system: application and design,” McGraw Hill, 1990.
19.
Mastinu, G., Gobbi, M., “Dispositivo e metodo per la misura di forze e momenti,” Italian Patent, MI2003A 001500, 22/07/2003. PTC Extension pending.
20.
Mastinu G., Pennati M., Gobbi M., “Design and Construction of a Test Rig for Assessing Tyre Characteristics at Rollover,” SAE Transactions: Journal of Passenger Cars-Mechanical Systems, pp: 2023-2040, 9-2003.
21.
http://www.sendev.com/ Sensor Development Inc. (Model 77016 and 6 axis WFS), 5/2005.
22.
http://www.ati-ia.com/ ATI Industrial Automation, (Series OMEGA and GAMMA), 5/2005.
23.
http://www.michsci.com/ Michigan Scientific Corporation (model LW 12.8), 5/2005.
24.
http://www.mts.com/ MTS Systems Corporation (SWIFT Wheel Force Transducer), 5/2005.
25.
http://www.kistler.com Kistler (RoaDyn Wheel Force Sensor), 5/2005.
26.
http://www.igel-ingenieure.de/ (IGel WFT Wheel Sensor), 5/2005.
27.
http://www.vicon.com, ViconPEAK Optical Tracking Systems, 5/2005.
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