Aircraft Active Deceleration Control via Segmented Speed Profiles
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Solution Overview
Problem
Conventional aircraft systems face challenges in accurately controlling speed, altitude, and time during descent segments due to complexity and uncertainty in flight planning, particularly in meeting timing and other accuracy requirements.
Innovation Solution
A system comprising a navigation system, guidance system, and active deceleration system that determines the initial and final states of an aircraft and constructs a deceleration segment with intermediate speed targets, incorporating a lead factor to adjust the speed profile and ensure accurate arrival at designated speeds and altitudes, using a flight management system, auto-pilot, and actuators to implement the flight plan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional aircraft systems use standard flight management systems to control speed and altitude during descent, then the basic flight control function is maintained, but the timing accuracy and speed control precision deteriorate due to complexity and uncertainty in flight planning
Solution Approach 1:
The deceleration segment is divided into multiple sub-segments with intermediate speed targets. The guidance system constructs a deceleration segment between a first state (first speed and first time) and a second state (second speed and second time) with at least one intermediate speed between the first speed and the second speed, enabling precise timing control through staged speed adjustments
Solution Approach 2:
The system proactively adjusts the speed profile by introducing a lead factor that advances the deceleration timing. The flight management system determines an adjusted speed profile that includes a lead factor to advance a timing of the deceleration segment, ensuring the aircraft will meet the required speed and altitude at the correct time
2Loss of time
If the aircraft uses aggressive deceleration to meet speed and time constraints, then the timing accuracy improves, but the control stability and safety deteriorate due to rapid speed changes
Solution Approach 1:
The deceleration is segmented into controlled stages with intermediate speed targets, preventing aggressive single-stage deceleration. The system constructs the deceleration segment with at least one intermediate speed between the first speed and the second speed, ensuring smooth and stable speed transitions
Solution Approach 2:
The system dynamically adjusts the deceleration profile based on real-time aircraft state and lead factor calculations. The adjusted speed profile is determined by the flight management system to advance timing while maintaining stability through continuous optimization of the deceleration rate
Data Source
AI summary
A system is provided for controlling the speed of an aircraft during a deceleration segment between a first state associated with a first speed and a first time and a second state associated with a second speed and a second time. The system includes a navigation system configured to determine the first state; a guidance system configured to determine the second state; and an active deceleration system coupled to the navigation system and the guidance system and configured to construct the deceleration segment between the first state and the second state with at least one intermediate speed between the first speed and the second speed.