Loom Speed Variation and Efficiency at Start and Stop
topic
Loom efficiency losses from speed variation during startup and slowdown represent a significant fraction of total production time for short warp beams, with the acceleration from stop to target speed taking 5 to 15 seconds and the deceleration from target speed to stop taking 2 to 8 seconds, during which the loom operates at reduced speed producing fewer picks per unit time and potentially at different insertion conditions that create start-mark and stop-mark quality risks requiring programmed speed profile management.
Role
Identifies the kinematic efficiency losses inherent in any loom speed variation event that reduce the fraction of time spent at maximum production speed, with this analysis being particularly important for the calculation of net efficiency for short warp runs where startup and shutdown represent a significant fraction of total warp production time, and for the optimisation of start-mark elimination procedures that extend the startup sequence duration to prevent marks but further reduce the net production rate during each restart.