Computational Study of a Motion Sensor to Simultaneously Measure Two Physical Quantities in All Three Directions for...

Area of Science:

• Mechanical Engineering
• Aerospace Engineering
• Sensor Technology

Background:

• Cross-axis sensitivity in accelerometers compromises accuracy.
• Unmanned Aerial Vehicles (UAVs) require precise motion sensing for navigation and control.
• Existing sensors often struggle with simultaneous measurement of acceleration and rotation.

Purpose of the Study:

• To utilize inherent device errors in thermal accelerometers for simultaneous multi-quantity measurement.
• To develop a single motion sensor capable of measuring acceleration and rotation in X, Y, and Z directions.
• To enhance the performance and data acquisition capabilities of UAVs.

Main Methods:

• Designed and simulated 3D structures of thermal accelerometers using a Finite Element Method (FEM) simulator (FLUENT 18.2).
• Correlated obtained temperature responses with input physical quantities (acceleration and rotation).
• Developed a graphical relationship between peak temperature values and input parameters.

Main Results:

• Successfully demonstrated simultaneous measurement of three accelerations and three rotations using a single motion sensor.
• Established a graphical method to determine acceleration (1g to 4g) and rotational speed (200 to 1000°/s) in all three directions.
• Quantified the relationship between temperature response and physical inputs.

Conclusions:

• The study presents a novel method to exploit thermal accelerometer errors for enhanced sensing.
• The developed technique enables simultaneous measurement of multiple motion parameters, crucial for UAV applications.
• This approach offers a pathway to more accurate and comprehensive motion tracking in aerial vehicles.