Example:  Ride Quality Over Time
The smoothness of rack and pinion elevators can degrade quickly over time, as shown in the graphs at left. The blue bars represent significant accelerations, with the bar height indicating the maximum acceleration, and the width showing duration of the acceleration. Yellow bars show door opening. In both graphs, the operator was making single trips between the openings and closings of the door. When first installed, a single acceleration / deceleration pair was recorded during these times. After five months of use, the accelerometer recorded multiple motions. In the latter case, the elevator was jerking significantly when it should have moved smoothly. This may indicate that the elevator needed lubrication, was lifting unbalanced loads, or just wearing out. Continued operation could result in failure or repairs.

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