Actuator Locking Cuff Layout for Redundant Shaft Control
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Solution Overview
Problem
Existing actuator locking systems in machines, such as spacecraft feathering systems, are prone to failures due to mechanical or hydraulic issues, leading to instability and reduced safety during critical operational scenarios like high-speed reentry into Earth's atmosphere.
Innovation Solution
The actuator locking system incorporates a series of specially designed cuffs along a shaft, including a primary link cuff, secondary link cuff, and drive link cuff, with redundant actuator control mechanisms to ensure reliable locking and unlocking of structural components, even in the event of primary actuator failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single actuator is used to control locking/unlocking of structural components, then the device complexity is reduced, but the reliability deteriorates due to potential actuator failure
Solution Approach 1:
The actuator control system is segmented into multiple independent actuators (primary actuator and secondary actuator), each capable of independently controlling the locking/unlocking of structural components. This segmentation allows the system to maintain functionality even if one actuator fails, thereby improving reliability without requiring a completely redundant complex system.
Solution Approach 2:
The system dynamically switches between primary and secondary actuators based on operational status. The secondary actuator remains in standby mode during normal operation but can be activated if the primary actuator fails. This dynamic configuration allows the system to maintain simplicity during normal operation while providing redundancy when needed.
2Reliability
If redundant actuator control mechanisms are added, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The secondary actuator is pre-configured and positioned in standby mode before any failure occurs. All necessary mechanical linkages, cuffs, and structural connections are pre-established during system assembly. This preliminary preparation allows the secondary actuator to immediately take over control functions if the primary actuator fails, improving reliability response time without adding complex real-time decision-making mechanisms.
3Stability of the object's composition
If the actuator locking system is made more robust, then the stability is improved, but the ease of operation deteriorates due to additional locking mechanisms
Solution Approach 1:
The locking and unlocking functions are merged into a single integrated mechanism controlled by the actuators. The cuffs and linkages are designed so that one actuator motion simultaneously achieves both locking and stability reinforcement, rather than requiring separate mechanisms for each function. This merging maintains ease of operation while providing robust stability.
Data Source
AI summary
Examples of the disclosed technology provide actuator locking systems and methods with enhanced reliability. The disclosed systems and methods facilitate a compact design that can improve safety and machine life for machines that implement them. Moreover, the systems and methods can be utilized in various types of machines, including spacecraft, aircraft, and other machines that adapt to different structural configurations for different operational scenarios (including different operational environments). To achieve a compact, reliable design, examples utilize a series of specially designed cuffs arranged along a shaft. Namely, an actuator locking system of the presently disclosed technology may comprise: (1) a primary link cuff; (2) a secondary link cuff; and (3) a drive link cuff. The cuffs can be arranged along a shaft with the secondary link cuff positioned between the primary link cuff and the drive link cuff.