Helicopter Hoist Cable Electrostatic Circuit
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Solution Overview
Problem
Composite or textile cables used in helicopter winches face issues with electrostatic potential differences between the helicopter and the load, leading to potential injuries or damage, and internal defects are difficult to detect, causing maintenance challenges and premature wear.
Innovation Solution
A lifting cable with integrated electrical conductors that form an electrical circuit with a switch, ensuring electrostatic continuity and including a measurement member to detect cable integrity, allowing for automatic analysis and timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a non-conductive composite or textile cable is used for lifting, then the cable weight is significantly reduced compared to steel cables, but electrostatic potential differences between the helicopter and load cause safety hazards
Solution Approach 1:
The lifting cable uses a composite structure combining non-conductive textile or composite material for lifting function with integrated conductive elements (metal wires or conductive coating) for electrostatic discharge. This composite construction allows the cable to maintain lightweight properties while providing electrical conductivity to prevent electrostatic hazards between helicopter and load.
2Object-affected harmful factors
If a second conductor cable is added to eliminate potential difference, then electrostatic safety is improved, but the risk of cable entanglement in rotors increases
Solution Approach 1:
The invention merges the lifting function and electrostatic discharge function into a single integrated cable assembly. The conductive elements are embedded within the non-conductive lifting cable structure, eliminating the need for a separate second cable. This consolidation reduces the number of cables from two to one, thereby eliminating entanglement risks while maintaining electrostatic safety.
3Difficulty of detecting and measuring
If steel cable wear analysis is performed by complete uncoiling, then wear detection accuracy is improved, but maintenance time and winch mechanism wear increase significantly
Solution Approach 1:
The invention replaces the mechanical inspection method (complete uncoiling and visual examination) with an electrical measurement method. Conductive elements integrated in the cable form measurement circuits that can detect cable integrity and wear through electrical properties without requiring cable uncoiling. This substitution maintains detection accuracy while dramatically reducing maintenance time and winch wear.
4Weight of moving object
If textile or composite cable is used instead of steel cable, then cable weight is reduced, but internal defect detection becomes extremely difficult
Solution Approach 1:
The invention introduces conductive elements as intermediary components within the non-conductive textile or composite cable structure. These conductive elements serve dual purposes: providing electrostatic discharge capability and enabling electrical measurement of cable integrity. By measuring electrical properties of the conductive elements, internal defects in the composite cable can be detected without visual inspection, solving the detection difficulty while maintaining weight advantages.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides protection against electrostatic shocks and enables efficient detection of cable wear, reducing maintenance time and preventing mechanical wear of the winch.
Implementation Method 1
at least one first electrical conductor integrated into a non-conductive structure constituting said cable
Implementation Method 2
a measuring device for an electrical quantity, mounted in series with one of the electrical conductors. This electrical quantity may be, for example, the electrical resistance or resistivity of the circuit
Data Source
Figure 1~2b
Figure 3~5
AI summary
The invention relates to a hoisting cable for a helicopter hoist, comprising at least one first electrical conductor (3) built into a non-conductive structure, and at least one second electrical conductor which is electrically isolated from the first conductor along the entire length of the hoisting cable, and looped back to said first conductor so as form a closed electric circuit on a switch (7).