Method of and apparatus for the elimination of the effects of inertial interference in force measurement systems, including touch-input computer and related displays employing touch force location measurement techniques

A method of measuring force and/or torque to be applied to a mechanical system, including, where desired, objects associated therewith and portions of forces measuring apparatus itself, that comprises, sensing one or more components of force and/or torque applied to the system by deliberate forces acting thereupon to provide force and/or torque measurements uncorrected by inertial interference motion effects that arise;

• deriving time derivatives including at least a set of the second order derivatives of the uncorrected force measurements and/or linear combinations of the same, and subtracting the same in different linear combinations of each order in turn from each channel of uncorrected force measurement, with coefficients of combination of said subtracting chosen such that the resulting sums reflect the desired force measurements substantially free of inertial motion interference errors.

A method of measuring force and/or torque to be applied to a mechanical system, including where desired, objects associated therewith and portions of the force measuring apparatus itself, that comprises, sensing one or more components of force and/or torque applied to the system by forces acting thereupon to provide force and/or torque measurements uncorrected by inertial interference motion effects that arise;

• deriving time derivatives including at least in one instance, the second time derivative of some or all of the uncorrected force measurements or linear combinations thereof by subtracting such linear combinations thereof from an uncorrected force measurement, to yield the desired force measurement substantially free of inertial motion interference errors.

A method of measuring force and/or torque applied to a mechanical system, including, where desired, objects associated therewith and portions of the force measuring apparatus itself, that comprises, sensing two or more components of force and/or torque applied along corresponding input channels to the system by forces acting thereupon to provide force and/or torque measurements uncorrected for inertial interference motion effects that arise;

• correcting at least one channel of force measurement by applying corrections derived from other input channels of the uncorrected force measurements, such that the output of said one channel of force measurement is rendered substantially free of inertial interference errors, and in which the deriving and applying of corrections is mathematically substantially equivalent to deriving corrections which are time derivatives, including in at least one instance the second time derivative of some or all of the uncorrected force measurements or linear combinations of the same, and from an uncorrected force measurement of another channel to yield said one channel of force measurement which is substantially free of inertial interference.

Within a method for measuring aspects of the location of application of a force to an object, a method of measuring force and/or torque applied to the object that comprises, sensing two or more components of force and/or torque applied to the object, by forces acting thereupon, to provide force and/or torque measurements uncorrected for inertial interference motion effects that arise;

• correcting at least one force measurement by applying corrections derived from other uncorrected force measurements, such that said one force measurement is rendered substantially free of inertial interference errors, and in which the deriving and applying of corrections is mathematically substantially equivalent to deriving corrections which are time derivatives, including in at least one instance the second time derivative, of some or all of the uncorrected force measurements or linear combinations of the same.