Single Track Translating Inlet Actuator Load Management
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Solution Overview
Problem
Existing aircraft nacelle inlet systems lack efficient mechanisms to modulate mass flow rate during varying operating conditions, leading to inefficient airflow management and increased complexity in actuator design due to inertial load handling.
Innovation Solution
A translating inlet assembly with a guide rod and actuator system that diverts inertial loads through a track and rail system, allowing the second portion to translate relative to the first portion, reducing the load on actuators and enabling lighter, less complex actuator designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional inlet system is used without a translating mechanism, then the structure is simpler, but the mass flow rate cannot be modulated efficiently during varying operating conditions
Solution Approach 1:
The inlet system employs a translating second portion that can dynamically adjust its position relative to the first portion, transforming a static structure into a dynamic one. This allows the inlet area to be modulated during operation, enabling efficient mass flow rate adjustment across varying flight conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
The inlet assembly is divided into two distinct portions: a first portion and a second portion that can translate independently. This segmentation allows the second portion to be positioned at different locations, thereby modulating the inlet area and mass flow rate without requiring complete redesign of the entire inlet system.
2Weight of moving object
If the actuator must handle inertial loads directly, then the actuator can be smaller and lighter, but the actuator design becomes more complex and integration risks increase
Solution Approach 1:
A guide rod is introduced as an intermediary component between the actuator and the second portion. The guide rod translates the actuator's linear motion into the desired movement of the second portion while managing inertial loads. This mediator allows the use of a lighter actuator without requiring it to directly withstand high inertial forces, thereby reducing actuator weight and complexity simultaneously.
Solution Approach 2:
The inertial load handling function is extracted from the actuator and assigned to the guide rod and track system. This separation allows the actuator to focus solely on generating the necessary force for translation, while the guide rod and track manage the inertial loads, resulting in a simpler and lighter actuator design.
3Productivity
If the second portion translates to modulate airflow, then mass flow rate control is improved, but inertial loads on the actuator increase
Solution Approach 1:
The guide rod serves as a mechanical intermediary that decouples the actuator from the inertial loads. As the second portion translates to modulate airflow, the guide rod absorbs and manages the inertial forces, allowing efficient airflow control without transmitting full inertial loads to the actuator.
Solution Approach 2:
The direct mechanical connection between actuator and second portion is replaced with a guide rod and track system. This substitution allows the actuator to operate with reduced inertial loads while the guide rod and track handle the mechanical guidance and load management, improving airflow modulation efficiency without excessive force requirements on the actuator.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A translating inlet assembly (102, 202, 302) may comprise a first inlet portion (120, 122, 220, 222, 320, 322) and a second portion (120, 122, 220, 222, 320, 322) configured to translate relative to the first portion (120, 122, 220, 222, 320, 322). A track (126, 226, 326) may be located in the first portion (120, 122, 220, 222, 320, 322). A rail (128, 228, 328) may be coupled to the second portion (120, 122, 220, 222, 320, 322) and configured to translate along the track (126, 226, 326). The rail (128, 228, 328) and the track (126, 226, 326) may form a load bearing component configured to transfer inertial loads experienced by the second portion (120, 122, 220, 222, 320, 322). A first actuator (130, 230, 330) may be operationally coupled to the rail (128, 228, 328) and configured to drive the rail (128, 228, 328) along the track (126, 226, 326)