Static Accelerometer Orientation Tumble Calibration Procedures
Static tumble calibration calculates accelerometer bias, scale factor, and cross-axis matrices by optimizing spatial vector residuals against local gravity.
Dynamic Transient Dampening
Oscillation Suppression
Mechanical methods designed to absorb and dissipate vibrational energy prevent prolonged resonant oscillations in sensitive measuring instruments. Applying dynamic transient dampening to an accelerometer fixture ensures that the shock response decays rapidly. This mechanism utilizes specialized materials or feedback loops to neutralize spurious high-frequency disturbances.
The action terminates at the boundary of the sensor housing, ensuring the internal sensing elements remain unaffected.
Viscous Attenuation
Fluid-filled chambers or viscoelastic layers provide the resistance needed to convert kinetic energy into thermal energy. Under shear stress, the dynamic transient dampening material deforms to create a counter-force that opposes the velocity of the shock wave. The viscosity is chosen based on the operating temperature range of the instrument.
Too high a viscosity results in a sluggish response that compromises calibration speed.
Metrological Settling
Rapid recovery to steady-state limits is necessary to maintain high throughput in calibration facilities. When dynamic transient dampening is properly tuned, the system returns to its neutral baseline within milliseconds of a step excitation. This reduces the wait time before an accurate measurement can be registered.
If the dampening is insufficient, secondary ringing creates a source of measurement uncertainty that requires statistical averaging to filter out. The efficiency is verified during factory acceptance testing by applying a step force.
Elastomeric Compliance
Materials like polyurethane are selected because their properties do not drift under compression. In a dynamic transient dampening setup, these elastomeric isolators must withstand cyclic loads. Any degradation of the material alters the transfer function.