Rotorcraft Vortex Domain Detection via Predictive Speed Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotorcraft systems lack effective methods to detect and warn pilots of approaching vortex domains, particularly during slow descending flights and low advance speeds, which can lead to loss of lift and controllability, and current solutions are limited by dependence on wind conditions and operational realism.
Innovation Solution
A method and device that calculate predictive advance and vertical speeds of a rotorcraft in real time, using threshold limits determined from preliminary measurements, to detect approaching vortex domains and trigger alarms, regardless of wind conditions, allowing for early warning and improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If predictive speed calculation is implemented to detect vortex domain approach, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary measurements to determine threshold limits before actual operation. These pre-established thresholds are stored and used during flight to compare against calculated predictive speeds, enabling accurate vortex detection without requiring complex real-time threshold determination
Solution Approach 2:
The patent introduces an intermediary processing system that calculates predictive speeds from measured airspeed and vertical speed data, then compares these predictions against stored thresholds. This intermediary layer translates raw sensor data into meaningful vortex proximity indicators without requiring direct complex analysis of airflow patterns
2Loss of time
If real-time predictive speed calculation is performed, then early warning capability is improved, but use of energy increases
Solution Approach 1:
The system calculates predictive speeds only when necessary based on flight conditions, rather than continuously computing all parameters at maximum precision. The calculation is triggered by comparing measured speeds against thresholds, performing computations only in the partial timeframe when vortex approach is possible
Solution Approach 2:
Threshold limits are determined in advance through preliminary measurements and stored in memory. During flight, the system only needs to compare current predictive speeds against these pre-stored thresholds rather than performing complex real-time analysis, significantly reducing energy consumption during actual operation
Data Source
AI summary
A method and a device for detecting that a rotorcraft is approaching a vortex domain. After previously determining a limit advance speed threshold and a limit vertical speed threshold defining a limit for said rotorcraft entering into a vortex domain, a predictive advance speed and a predictive vertical speed for said rotorcraft are calculated, said predictive vertical speed being calculated differently depending on the value of said instantaneous advance speed. Thereafter, said predictive advance speed and said predictive vertical speed are compared with said thresholds, which may be thresholds with hysteresis, in order to determine whether said rotorcraft is approaching a vortex domain, and if so to signal this situation to a pilot of said rotorcraft.