Depending on the characteristics of the mechanical load driven by a magnetostrictive actuator, the principal electrical and mechanical relationships tend to be

• Rod mechanical expansion is an analog scale of coil electrical current.
  
  
  • The time rate of change of rod mechanical expansion is an analog scale of the time rate of change of coil electrical current.
  
  
  
• Available force equals rod preload compression.
  
  
  • The time rate of change of force output is an analog scale of the time rate of change of coil voltage.

It is expected that similar relationships govern other dynamic systems.