Patent ID: 7665371

Claim:
Method for measuring forces and moments acting on a body, characterised in that it comprises the application onto the said body ( 11 ) of a measuring structure ( 12 ), comprising one or more elements, connected together through a plurality of elastic connection elements or elastic bindings ( 17 , 18 , 37 ) in a statically non determined way; said body ( 11 ) being stressed by generalised forces described by the vector Fg=[Fx Fy Fz Tx Ty Ta], to be determined, Fg being defined by the components along three coordinated axes of the generalised external forces (a moment vector T and a force vector F orientated in any way), said vector Fg being obtained by measuring on said measuring structure ( 12 ) six magnitudes in one or more points, said magnitudes defined by a vector S=[S 1 S 2 S 3 S 4 S 5 S 6 ]; and deriving the vectors F and T from the mathematical relationship between Fg =[Fx Fy Fz Tx Ty Tz] and S=[S 1 S 2 S 3 S 4 S 5 S 6 ] for statically non determined structures wherein said mathematical relationship comprises matrices containing terms dependent upon the geometric dimensions of said measuring structure ( 12 ) and terms related to stiffness of said elastic connection elements for elastic bindings ( 17 , 18 , 37 ) said measuring structure ( 12 ) comprising three arms ( 15 ) carrying at the end ( 16 ) said connection elements consisting of spherical joints ( 17 ) free to translate in the direction of the axis of the arms ( 15 ) because of a further slider type binding ( 18 ); six bending moments are measured, said six moments being two perpendicular bending moments for each arm.