Towbarless Tractor Winch Control for Faster Nose Gear Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing towbar systems for airplanes require synchronized payout and retraction of winch straps, leading to time-consuming operations due to the need for slower speeds to ensure precise control and safe handling.
Innovation Solution
A towbarless tractor system with a winch assembly that selectively pays out the winch strap at a faster rate than it retracts, allowing for efficient and precise capture of the airplane's nose gear using a cradle and winch assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the winch assembly operates at the same speed for both retraction and payout, then precise control and safe handling are ensured, but the payout process becomes time-consuming
Solution Approach 1:
The winch assembly dynamically adjusts its operating speed based on the operational phase: it operates at a higher first rate during payout and transitions to a slower second rate during retraction. This dynamic speed adjustment allows the system to optimize both time efficiency and safety control by matching the winch speed to the specific operational requirements of each phase.
Solution Approach 2:
The system changes the operational parameter of winch speed from a constant value to a variable value with two distinct rates. The control system selectively applies the first rate (faster) for payout operations and the second rate (slower) for retraction operations, thereby changing the speed parameter to resolve the contradiction between time efficiency and safety control.
2Productivity
If the winch strap is paid out at a faster rate, then operational speed is improved, but control precision during retraction may be compromised
Solution Approach 1:
The winch assembly employs dynamic speed adjustment, transitioning between a faster first rate during payout to enhance productivity, and a slower second rate during retraction to maintain control precision. This dynamic adaptation allows the system to achieve high operational speed when safety is less critical while preserving precision control when the winch strap is being retracted.
Solution Approach 2:
The system implements parameter changes by selectively applying different speed rates based on the operational phase. The control system switches from the first rate (higher speed) during payout to the second rate (lower speed) during retraction, thereby optimizing the speed parameter to balance productivity and control precision requirements.
3Device complexity
If synchronized payout and retraction rates are used, then system simplicity is maintained, but overall towing efficiency is reduced
Solution Approach 1:
The control system implements dynamic rate adjustment with two distinct operational modes: a faster first rate for payout and a slower second rate for retraction. This dynamic control enhances towing efficiency by reducing the time-consuming payout operation, while the control system remains relatively simple through selective rate application based on operational phase.
Solution Approach 2:
The system changes the winch operational parameter from a single synchronized rate to two selective rates. The control system selectively applies the first rate during payout and the second rate during retraction, thereby improving towing efficiency without significantly increasing system complexity through the use of straightforward rate selection logic.
Data Source
AI summary
A towbarless tractor for towing an airplane having a nose gear includes a chassis, a plurality of tractive assemblies coupled to the chassis, a capture system including a cradle configured to support the nose gear and a winch assembly including a winch strap configured to selectively couple with the nose gear, and a control system configured to selectively pay out the winch strap at a first rate and selectively retract the winch strap at a second rate during an airplane winching operation to pull the towbarless tractor towards the airplane such that the cradle is pulled underneath the nose gear. The first rate is greater than the second rate such that the winch strap is paid out faster than the winch strap is retracted during the airplane winching operation.