Hoist Cable Cut Control for Overload and Clutch Slip
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Solution Overview
Problem
Existing hoist cable cutting systems in rescue operations require manual intervention, which can lead to delayed cable cutting and hazardous scenarios due to overload, posing risks to helicopters and personnel.
Innovation Solution
An augmented cable cutting algorithm that automatically initiates cable cutting based on dual-redundant clutch slip and load monitoring, with an override option for the operator, ensuring timely cable release during snagging scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual cable cutting is used in overload situations, then the operator can assess the situation, but the reaction time is delayed and hazardous scenarios occur
Solution Approach 1:
The system performs preliminary monitoring of clutch slip and load conditions continuously, so that when an overload situation occurs, the cable cutting can be initiated immediately without waiting for manual assessment. The algorithm is pre-programmed to automatically trigger cable cutting when specific thresholds are exceeded, eliminating the time delay associated with manual decision-making.
Solution Approach 2:
The hoist system monitors its own operational parameters (clutch slip, load) and automatically initiates cable cutting when overload conditions are detected, without requiring external human intervention. The system serves itself by detecting its own hazardous state and taking corrective action, thereby eliminating the reaction time delay inherent in manual operations.
2Loss of time
If automatic cable cutting is implemented, then reaction time is reduced, but the system complexity increases with additional sensors and algorithms
Solution Approach 1:
The system uses feedback from existing clutch sensors and load sensors to monitor operational conditions and automatically trigger cable cutting when predefined thresholds are exceeded. The algorithm processes the feedback signals from these sensors and initiates cable cutting when the combination of clutch slip duration and load magnitude indicates an overload hazard, achieving automatic response without requiring overly complex monitoring systems.
Solution Approach 2:
The system monitors changes in operational parameters (clutch slip duration, load magnitude) and triggers cable cutting when these parameters exceed predefined thresholds. By focusing on specific critical parameter changes rather than comprehensive system monitoring, the solution achieves automatic cable cutting with minimal additional system complexity.
3Measurement precision
If dual-redundant clutch sensors are used, then measurement precision is improved, but the device complexity increases
Solution Approach 1:
The clutch slip monitoring function is segmented into two independent sensor placements: one on the motor side of the gear train and one on the drum side. This segmentation allows the system to detect clutch slip more precisely by comparing the rotational states of the motor and drum, while keeping each sensor simple and the overall system manageable in complexity.
Solution Approach 2:
The gear train acts as an intermediary mechanical element between the motor and drum, allowing the dual clutch sensor arrangement to detect slip conditions. By placing sensors at both ends of this intermediary mechanism, the system achieves precise clutch slip detection without requiring direct measurement of the clutch engagement itself, thereby managing system complexity.
Data Source
AI summary
Systems and methods for operating a hoist and hook assembly may method comprising determining a clutch slip via a clutch sensor, determining an overload via a load sensor, and cutting a cable coupled to the hoist and hook assembly in response to the clutch slip determination and the overload determination.