Rotorcraft Obstacle Alert Using Predictive Speed Vector
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Solution Overview
Problem
Conventional terrain avoidance warning systems for rotorcraft are not suitable and can be hazardous as they fail to generate alerts when the aircraft is still in danger of impacting obstacles, especially when the pilot modifies the cyclic pitch of the blades, leading to inadequate representation of the rotorcraft's energy balance.
Innovation Solution
A method using a calculation speed vector, which includes a horizontal and vertical component, is introduced to determine the risk of obstacle impact, incorporating a corrective term based on the current path speed and its derivative, to generate a more representative alert, optimizing obstacle avoidance maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional terrain avoidance warning systems use current speed vector for alert generation, then the system is simple to operate, but the alert accuracy deteriorates when the pilot modifies cyclic pitch of the blades
Solution Approach 1:
The system performs preliminary calculation of the calculation speed vector by predicting future speed based on current speed, acceleration, and energy balance considerations. This preliminary action allows the alert system to account for upcoming maneuvers before they fully manifest in the current speed vector, improving alert accuracy during cyclic pitch modifications without requiring complex real-time sensing
Solution Approach 2:
The invention introduces a calculation speed vector that differs from the current speed vector by incorporating predictive parameters (acceleration, energy balance) and a scaling factor. This parameter transformation allows the system to generate more accurate alerts during maneuvering conditions while maintaining computational efficiency through a structured mathematical model rather than complex simulations
2Reliability
If the system generates alerts based on current speed vector only, then the response time is fast, but the reliability of obstacle avoidance deteriorates during energy-intensive maneuvers
Solution Approach 1:
The system calculates the calculation speed vector in advance by combining current speed, acceleration data, and energy balance predictions. This preliminary calculation ensures that when an alert is needed, the system already has a refined speed vector that accounts for ongoing maneuvers, improving reliability without adding computational delay during critical moments
Solution Approach 2:
The system continuously monitors acceleration and energy balance parameters, using this feedback to adjust the calculation speed vector dynamically. This feedback mechanism ensures that the alert system remains reliable during energy-intensive maneuvers by constantly updating the predictive model with actual flight conditions while maintaining real-time performance
Data Source
AI summary
A piloting assistance method for avoiding an obstacle with a rotorcraft flying along a current speed vector (Vect0). An alert is generated by using a speed vector of the rotorcraft referred to as a “calculation” speed vector (Vect1) in order to determine whether the rotorcraft might impact an obstacle. During a correction stage and at each calculation iteration, the calculation speed vector (Vect1) is determined using a horizontal component and a vertical component, the vertical component being a function of a current vertical speed of the rotorcraft relative to the ground corrected with a corrective term, the corrective term being a function of a product of a current path speed of the rotorcraft multiplied by the derivative of the path speed.