Device and method for measuring cross-inertia-moment in limited angular rotary axis

A measuring method of the cross-inertia-moment in a limited angular rotary axis, the method comprising:

• (a) a first measuring procedure, comprising the substeps of:
• securing a first rotatory axis in a roller, wherein the roller includes the first rotatory axis that is supported by four load cells, a second rotatory axis that is orthogonal to the first rotatory axis and is rotatable round the first rotatory axis, and a third rotatory axis that is orthogonal to the first rotatory axis and the second rotatory axis, respectively, and is rotatable;
• applying sine wave vibration to the second rotatory axis;
• detecting signals outputted from each load cell by the applied vibration to the second rotatory axis;
• and
• calculating, based on the outputted signals from each load cell, moment and cross-inertia-moment for the first rotatory axis;
• (b) a second measuring procedure, comprising the substeps of:
• disposing, at the roller, the third rotatory axis to face the same direction with the first rotatory axis, and securing the first rotatory axis;
• applying sine wave vibration to the second rotatory axis;
• detecting signals outputted from each load cell by the applied vibration to the second rotatory axis;
• and
• calculating, based on the outputted signals from each load cell, moment and cross-inertia-moment for the third rotatory axis;
• (c) a third measuring procedure, comprising the substeps of:
• securing the second rotatory axis at the roller;
• applying sine wave vibration to the first rotatory axis;
• detecting signals outputted from each load cell by the applied vibration to the first rotatory axis;
• and
• calculating, based on the outputted signals from each load cell, moment and cross-inertia-moment for the second rotatory axis;
• (d) a fourth procedure, comprising the substeps of:
• disposing, at the roller, the third rotatory axis to face the same direction with the initial direction of the second rotatory axis, and securing the second rotatory axis;
• applying sine wave vibration to the first rotatory axis;
• detecting signals outputted from each load cell by the applied vibration to the first rotatory axis;
• and
• calculating, based on the outputted signals from each load cell, moment and cross-inertia-moment for the third rotatory axis.