Digital mechanical measurement last and signal acquisition and analysis method thereof

A digital mechanical measurement last system comprising:

• a front part of the last, a rear part of the last, a three-dimensional strain gauge load cell, a signal amplifier, a data acquisition card, data acquisition system software, and a data line, wherein
• the front part and the rear part of the last are obtained by dividing the last along a vertical plane passing through a mass center of the last and perpendicular to the long axis of the last, the front part and the rear part of the last are each provided with a position for placing the three-dimensional strain gauge load cell, the depth of the position is half of a length of the three-dimensional strain gauge load cell, and a strain slit is existed between the front part and the rear part of the last;
• a center of the three-dimensional strain gauge load cell coincides with the mass center of the last, a long axis of the three-dimensional strain gauge load cell is parallel to a long axis of the last, two ends of the three-dimensional strain gauge load cell are connected to the front part and the rear part of the last, and a circumference of the three-dimensional strain gauge load cell is not in contact with the last;
• and
• the signal amplifier, the data acquisition card, and the data acquisition system software are disposed outside the last, the signal amplifier comprises a signal input circuit, a signal amplification circuit, a signal filtering circuit, and a signal output circuit, and transmits a signal to the data acquisition card through the signal output circuit;
• the data acquisition card comprises a data acquisition module, an A/D conversion module, and a host computer communication module, and completes communication with a computer through a USB interface;
• and the data line passes through a data line channel in the rear part of the last, and connects the three-dimensional strain gauge load cell, the signal amplifier, the data acquisition card, and a data acquisition system, to implement data measurement.