Dual-Direction Synchronous Loading for True-Triaxial Test Apparatus
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Solution Overview
Problem
Current true-triaxial test apparatuses face challenges in maintaining accurate stress loading due to independent actuators in the same direction, leading to uneven stress and eccentric loading, which can result in test failures caused by improper operation.
Innovation Solution
A dual-direction synchronous loading method for a true-triaxial test apparatus, where two actuators in the same direction are connected in series through an iADA voltage amplification module and an iDCA signal integration module, allowing for single-instruction synchronous loading controlled by PID controllers, ensuring accurate centering and loading of rock samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two actuators in the same direction are controlled independently, then each actuator can be adjusted separately, but the loading becomes unsynchronized causing uneven stress and eccentric loading
Solution Approach 1:
The patent merges the control of two independent actuators into a unified control system. The controller receives a single loading instruction and distributes synchronized control signals to both actuators, ensuring they move together as a coordinated unit. This combining of control functions eliminates the synchronization errors that occur with independent control while maintaining the ability to adjust loading parameters.
Solution Approach 2:
The patent implements feedback mechanisms where sensors monitor the position and load status of both actuators in real-time. This feedback information is fed back to the controller, which adjusts the control signals to maintain synchronized operation. The feedback loop ensures that any deviations from the intended synchronous loading are automatically corrected, maintaining high precision throughout the loading process.
2Measurement precision
If sample centering is performed manually with high operational accuracy requirements, then centering can be achieved, but the probability of test failure due to improper operation increases
Solution Approach 1:
The patent implements an automatic sample centering system that performs centering operations without requiring manual intervention. The system uses sensors to detect sample position and automatically adjusts the sample location to the center of the pressure chamber. This self-service approach eliminates the variability and potential errors associated with manual centering operations, significantly reducing test failure probability while maintaining high centering accuracy.
Solution Approach 2:
The patent replaces manual mechanical centering operations with an automated control system. Instead of relying on operators to manually position and center the sample, the system uses automated actuators and control algorithms to achieve precise centering. This substitution of mechanical/manual operations with automated systems eliminates human error and improves both accuracy and reliability.
3Manufacturing precision
If a single instruction controls dual-direction loading, then synchronous loading is achieved, but the control system complexity increases
Solution Approach 1:
The patent designs a universal controller that can manage multiple actuators and loading directions through a single unified interface. This multi-functional controller handles both X and Z direction actuators, coordinate transformations, and synchronization functions, reducing the need for separate control systems for each actuator. The universal controller simplifies the overall system architecture while maintaining the capability to perform complex synchronous dual-direction loading operations.
Data Source
AI summary
A dual-direction synchronous loading method for a true-triaxial test apparatus includes the following steps: Step S1, loading a sample and adjusting the sample at a center of a sample box and a rigid loading frame; Step S2, setting parameters and sending action instructions through a computer control panel; and Step S3, collecting load signals collected by each sensor acquired by a PID controller, and coordinating a size of triaxial dual-direction loading loads to realize a single instruction dual-direction synchronous loading. The method ensures that a rock sample is kept at a center of a pressure chamber before being loaded, so that a focus of a loading axis is always at a same position as a center of the sample in space, and the function of synchronous loading of two loading actuators in the same direction under a single instruction can be achieved.