Rotary Component Memory Device for Impeller Lifespan Tracking
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Solution Overview
Problem
Turbomachine impellers face challenges in accurately assessing their remaining lifespan due to varying operational conditions and duty cycles, leading to potential premature failure and increased costs from frequent replacements or ignoring limited life, which can pose safety risks.
Innovation Solution
A rotary component with a memory device to store data on past use, including rotational speed, temperature, damage, and material properties, along with detectors and processing means to sample and derive data on fatigue and creep damage, enabling estimation of remaining lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If impellers are replaced after a fixed time interval (e.g., 50,000 hours), then replacement simplicity is improved, but reliability deteriorates when impeller life falls short of the assumed lifespan
Solution Approach 1:
The system continuously monitors impeller operating conditions (temperature, speed, load) and provides feedback to calculate actual damage accumulation and remaining lifespan. This real-time feedback replaces fixed-time replacement with condition-based replacement, allowing operators to know the actual remaining life of the impeller and schedule maintenance accordingly, thereby improving reliability while maintaining operational simplicity.
Solution Approach 2:
The patent replaces the mechanical/time-based replacement system with an information-based system using sensors, processors, and memory devices to track impeller condition. Instead of relying on fixed time intervals or simple mechanical replacement, the system uses digital monitoring and calculation of damage accumulation to determine actual impeller lifespan, substituting mechanical simplicity with intelligent monitoring to achieve both reliability and ease of operation.
2Reliability
If impeller components are changed at regular conservative intervals, then safety is improved, but cost increases due to unnecessary replacements
Solution Approach 1:
The system provides continuous feedback on actual impeller damage accumulation and remaining lifespan based on real-time monitoring of operating conditions. This allows operators to replace impellers only when actually needed based on calculated remaining life rather than following fixed conservative intervals, thereby maintaining safety while eliminating unnecessary replacements and reducing costs.
Solution Approach 2:
The patent changes the parameter for replacement decision from fixed time intervals or conservative estimates to actual calculated remaining lifespan based on real-time operating parameters (temperature, speed, load). By dynamically adjusting replacement timing based on actual condition parameters rather than static schedules, the system achieves both safety and cost-effectiveness.
3Strength
If titanium-based materials are used instead of aluminium-based materials, then mechanical strength and safety margin are improved, but cost increases by approximately 30%
Solution Approach 1:
The system monitors actual operating conditions and calculates real-time damage accumulation and remaining lifespan for the impeller. This feedback mechanism allows operators to maximize the useful life of aluminium-based impellers by replacing them only when actually needed based on calculated remaining life rather than using more expensive titanium materials proactively, thereby achieving cost-effectiveness while maintaining adequate safety through informed replacement timing.
Solution Approach 2:
The patent introduces dynamic monitoring and calculation of actual impeller condition and remaining lifespan. Instead of statically selecting more expensive titanium materials for all impellers, the system dynamically assesses the actual condition of aluminium-based impellers in service and determines when replacement is necessary, allowing flexible material selection based on actual operational needs rather than predetermined material specifications.
4Productivity
If impellers are run close to operational limit to reduce replacement frequency, then productivity is improved, but reliability deteriorates due to increased failure risk
Solution Approach 1:
The system provides continuous feedback on actual damage accumulation and calculates remaining lifespan based on real-time monitoring of operating conditions. This enables operators to run impellers longer than fixed schedules would allow while maintaining safety, as the feedback system identifies the actual point at which replacement is needed based on accumulated damage rather than arbitrary time limits, thereby improving productivity without compromising reliability.
Solution Approach 2:
The patent replaces simple time-based or conservative replacement systems with an intelligent monitoring system that calculates actual remaining lifespan based on real-time operating conditions and damage accumulation. This substitution allows impellers to be operated closer to their actual physical limits with informed replacement timing, maximizing productivity while maintaining reliability through data-driven decision-making rather than mechanical time schedules.
Data Source
AI summary
A rotating machine, has a rotary component, which includes a memory device for storing data relating to the past use of the component. The data are associated with rotational speed and ambient temperature, which are detected by detectors either on or off the rotary component. The stored data may be the raw temperature and speed data as sampled over time, which are then used to derive values of low-cycle fatigue and creep damage. These fatigue and creep values are, in turn, correlated with the load profiles of the component to arrive at a value of elapsed lifespan for the component. Alternatively, the stored data may be the fatigue and creep values and/or, preferably, values of elapsed and remaining lifespan of the component. In a second embodiment the detectors are located on the machine casing along with an evaluation unit.