Development of Counting Strain Gages for High-G Naval Aircraft

摘要

The NAVAIRDEVCEN has developed and constructed an airborne Strain Level Counter which presents visually the numbers of times that each of four strain levels has been exceeded. The system has two major components: an inductive strain sensor, installed in the critical structural area, which develops a voltage proportional to the strain: an indicator unit which houses all the solid state circuity necessary to energize the sensor and condition its output. The output, after appropriate filtering, is displayed on four electro-mechanical counters. Laboratory and flight tests of the strain sensor alone have been completed and are described. Overall accuracy of the complete system over the temperature range of -55C to +125C is estimated to be within 5%. (Author)