Study on Giant Frisbee Risk Assessment Based on Human Reliability Analysis

The paper makes Human Reliability Analysis on a typical amusement ride - the Giant Frisbee by using Cognitive Reliability and Error Analysis Method in order to help improve the safety in the operation of this machine. The study analyzes the accident cases of the Giant Frisbee and decomposes the task for the machine operation process by using Task Analysis Method so as to identify the key tasks operated by human and the possible operation risks. The study makes use of Contextual Control Model to identify cognitive behaviors and cognitive functions for each subtask of the Giant Frisbee and to determine CPC levels, performance reliability and weight factors. The paper identifies the basic failure modes of each subtask and then calculates the corresponding failure probability. The overall probability of the Giant Frisbee's failure to complete the task is 0.12015, where the boarding task stage is the point with highest risk throughout the machine operation.