Physical Deformation
Dimensional change in a mechanical component or support structure resulting from applied forces, thermal expansion or moisture absorption describes the response to stress. In precision engineering, structural strain alters the relative positions of aligned components and must be monitored to ensure system accuracy. This change is measured using strain gauges, optical fibers or capacitive displacement sensors.
Sensor Distortion
When a measurement instrument is mounted directly to a loaded component, the structural strain is transferred to the sensor housing. This transferred strain can distort the internal sensing elements and introduce errors in the measurement output. For example, strain in a gyroscope housing can cause a shift in the zero-rate bias.
Load Tracking
Tracking this parameter allows engineers to monitor the mechanical health of bridges, aircraft wings and high-pressure storage vessels in real time. The sensors used to measure structural strain must be highly stable and resistant to environmental drift caused by temperature and humidity. These sensors are calibrated against standard reference blocks to ensure measurement repeatability over several years.
Calibration Correction
High-precision systems employ multi-axis strain sensors to measure the structural strain of the instrument platform and apply real-time electronic compensation. This correction is done by mapping the strain-induced output variation and applying a corresponding correction coefficient to the sensor output. This compensation ensures that the instrument remains accurate even when the structure undergoes substantial mechanical deformation.
Such correction is essential for aerospace applications where weight-saving designs require structures to operate near their elastic limits.
