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← TechnologyWhich risk significantly increases when temperature-sensitive proportional valve actuators in a robotic arm exceed thermal limits?
A)Positional accuracy begins to drift✓
B)Bearing lubrication undergoes rapid oxidation
C)Sealing effectiveness demonstrates measurable improvement
D)Viscosity of hydraulic fluid decreases steadily
💡 Explanation
Positional drift arises because thermal expansion within the actuator body alters valve spool position affecting fluid flow, thus *thermal deformation* causes control deviations, therefore accuracy declines, rather than improved sealing or decreased viscosity under controlled temperature exertion.
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