< Back to Article
Averaged Propulsive Body Acceleration (APBA) Can Be Calculated from Biologging Tags That Incorporate Gyroscopes and Accelerometers to Estimate Swimming Speed, Hydrodynamic Drag and Energy Expenditure for Steller Sea Lions
Fig 1
The measured accelerometer vector is the vector sum of gravity and dynamic tag acceleration.
Acceleration due to gravity (
) is often called static acceleration, a constant at 9.8 m/s2 at the earth’s surface. Accelerations of an animal due to animal movements are dynamic (
). For large animals, accelerations of an animal’s mass due to locomotion tend to be substantially smaller than g, except for brief intervals. The measured acceleration (
) is the vector sum of 
and 
.
doi: https://doi.org/10.1371/journal.pone.0157326.g001