A method and system for calibrating a legform impactor knee assembly

By setting up calibration displacement and force sensors on a material testing machine, combined with the built-in sensors and data acquisition unit of the knee assembly, the high cost and inaccuracy problems caused by additional data acquisition units in the prior art are solved, and efficient and accurate knee assembly calibration is achieved.

CN119394607BActive Publication Date: 2026-07-14FAW VOLKSWAGEN AUTOMOTIVE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FAW VOLKSWAGEN AUTOMOTIVE CO LTD
Filing Date
2024-04-12
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing methods for calibrating knee assemblies of leg impactors require additional data acquisition devices, resulting in high hardware costs and inaccurate calibration results.

Method used

A calibration displacement sensor and a calibration force sensor are fixedly installed on a material testing machine. Using the built-in displacement sensor and built-in data acquisition unit of the knee assembly, measurement channel data are obtained by applying force, a displacement measurement curve is fitted, and the performance of the built-in displacement sensor is evaluated.

Benefits of technology

No additional data acquisition equipment is required, ensuring the integrity of the calibration object, directly evaluating the performance of the leg impactor, and improving the accuracy of the calibration results.

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Abstract

The application discloses a kind of leg type impactor knee assembly calibration method and system, comprising: fixedly setting calibration displacement sensor and calibration force sensor on the movable crossbeam of material testing machine, calibration displacement sensor is parallel to the moving direction of movable crossbeam, calibration force sensor is parallel to the direction of loading force;Knee assembly is fixedly set on material testing machine, built-in displacement sensor includes multiple displacement sensors, multiple displacement sensors of built-in displacement sensor are connected with multiple displacement measurement channels of built-in data acquisition device respectively;Calibration displacement sensor and calibration force sensor are connected with the reserved measurement channel of built-in data acquisition device respectively;By material testing machine, preset loading force is applied, while obtaining the measurement channel data of built-in data acquisition device;Fitting displacement measurement curve of the measurement channel data corresponding to displacement measurement channel with the change of bending moment, and according to preset calibration interval, the displacement measurement curve of built-in displacement sensor is evaluated.
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