Lever controls on specialised farm equipment: some control/response stereotypes

Area of Science:

• Human-Computer Interaction
• Agricultural Engineering
• Cognitive Psychology

Background:

• Specialized agricultural equipment, particularly in California, commonly uses linearly arranged hydraulic control levers.
• These controls manage multi-function equipment with complex articulating mechanisms for various linear and rotary movements (pitch, roll, yaw, clamping, encircling).

Purpose of the Study:

• To assess user stereotypes for controlling a cube's six degrees of freedom using control levers.
• To identify predictable mental models for assigning specific cube motions to control lever sets.

Main Methods:

• Experimental assessment of user stereotypes for assigning cube motions to control levers.
• Analysis of user responses to determine consistency with previous research and identify anomalous phenomena.

Main Results:

• General consistency with prior research on control stereotypes was observed.
• A strongly anomalous phenomenon was identified for the up/down motion control of the cube.
• Stereotypes for assigning multiple cube motions to sets of control levers were found to be weak or non-existent.

Conclusions:

• User control stereotypes for complex equipment are not universally strong, particularly for multi-axis movements.
• The identified anomaly in up/down motion control warrants further investigation for improved human-machine interface design.
• Current control layouts may not align with intuitive user expectations for complex motion control, suggesting a need for redesign in agricultural machinery.