Method for determining accuracy of strain measurement value in aircraft structural strength test

• Main Authors: ZHAI XINKANG, TIAN XIAOXING
• Format: Patent
• Language: Chinese; English
• Published: 06.04.2021
• Subjects: AIRCRAFT; AVIATION; COSMONAUTICS; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING ORREPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLYADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFTCOMPONENTS, NOT OTHERWISE PROVIDED FOR; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PERFORMING OPERATIONS; PHYSICS; TESTING; TRANSPORTING

The invention discloses a method for determining the accuracy of a strain measurement value in an aircraft structural strength test. The method comprises the following steps: step 1, applying a load and measuring a strain value; 2, calculating the difference between the loading measurement values and the unloading measurement values of all the strain gauges during loading and unloading under the same-stage load, and carrying out the rationality judgment; and 3, calculating measurement value errors of all the strain gauges during loading and unloading under the same-stage load. The method can be used for checking the rationality of the loading scheme through the strain measurement data distribution rule, the theoretical basis used in the method is correct, the implementation steps are clear and simple, and the engineering concept is clear; by adopting the method, the problem that the authenticity of the strain measurement value of the airplane structural strength test is difficult to determine is solved, and t