What does "actuator hysteresis" refer to in pneumatic systems?

Actuator hysteresis in pneumatic systems pertains to the difference in actuator output between increasing and decreasing inputs. This phenomenon occurs due to inherent friction, wear, and the properties of the materials that compose the actuator and its components. When an input signal is applied to an actuator, it will respond and produce a certain output. However, if the input signal is reduced, the output may not return to the exact original level due to these factors.

This characteristic is particularly important in applications where precision control is necessary, as it can lead to inaccuracies in the positioning or behavior of the actuator. Understanding hysteresis helps in the design and implementation of control systems, ensuring that adequate adjustments can be made to minimize its impacts.

Other choices do not accurately capture the concept of actuator hysteresis. The delay in system start-up pertains to initial activation time, which is unrelated to the output differences based on input changes. The time taken for air to traverse the system is more about flow dynamics rather than output response characteristics. Lastly, the maximum load an actuator can handle relates to the actuator's capacity and strength rather than the relationship between input and output changes associated with hysteresis.