Dual DSP Clearance Estimation for Rotating Machines
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Solution Overview
Problem
Existing clearance estimation systems for rotating machines, such as turbines, face challenges in providing real-time and accurate measurements due to noise interference and varying operational conditions, leading to inefficiencies and potential contact between components.
Innovation Solution
A processing system utilizing two digital signal processors (DSPs) with different processing speeds to perform distinct tasks, allowing for real-time sampling and processing of high-frequency signals, and dynamically switching between averaging and slicer-based techniques based on operating conditions to optimize clearance estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single processing system is used for clearance estimation, then the system structure is simple, but the processing speed is insufficient for real-time estimation
Solution Approach 1:
The processing system is divided into two separate DSPs with different processing speeds. The first DSP performs high-speed signal processing tasks while the second DSP performs lower-speed processing tasks, allowing each processor to be optimized for its specific function and enabling real-time clearance estimation without requiring a single overly complex high-performance processor
2Measurement precision
If traditional signal processing techniques are used, then the estimation is accurate, but the processing time is too long for real-time applications
Solution Approach 1:
The signal processing tasks are segmented and distributed between two DSPs with different processing speeds. The first DSP handles time-critical high-speed processing while the second DSP handles computational tasks that can be performed at lower speeds, enabling accurate clearance estimation to be completed within real-time requirements
Solution Approach 2:
The system dynamically switches between different clearance estimation techniques (averaging technique and slicer technique) based on operating conditions. This dynamic adaptation allows the system to optimize processing time while maintaining accuracy by selecting the most appropriate technique for current operational requirements
3Speed
If the processing system uses high-speed processing, then real-time estimation is achieved, but noise interference increases
Solution Approach 1:
The second DSP acts as an intermediary that receives high-speed processed signals from the first DSP and performs additional processing that filters out noise. This intermediary processing stage allows the system to maintain real-time processing capability while reducing noise interference through the second DSP's processing tasks
4Adaptability or versatility
If a fixed processing technique is used, then the system is simple to operate, but it cannot adapt to varying operating conditions
Solution Approach 1:
The system implements dynamic switching between different clearance estimation techniques (averaging technique and slicer technique) based on operating conditions such as signal quality and operational requirements. This dynamic adaptability allows the system to optimize performance for varying conditions without requiring a completely complex reconfiguration of the processing architecture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and real-time clearance estimation between rotating and stationary components, improving turbine efficiency and reducing noise interference, while adapting to changing operational conditions for precise control.
Implementation Method 1
a capacitance probe is employed to measure the clearance between two objects. The probe is located on one of the objects and measures a capacitance with respect to the other object for estimating the clearance between the two objects
Data Source
AI summary
A processing system for clearance estimation in a rotating machine includes one or more sensors and one or more digital signal processors for calculating the estimated clearance. The processing system may include techniques for obtaining real-time clearance estimates and techniques for obtaining averaged clearance estimates. Aspects of the processing system may also include a method of switching between real-time clearance estimates and averaged clearance estimates depending on the operating conditions of the rotating machine. Other aspects of the processing system include the use of two digital signal processors: a first digital signal processor configured to receive signals from a clearance sensor and perform a first set of high speed processing tasks, and a second digital signal processor configured to receive signals from the first digital signal processor and perform a second set of lower speed processing tasks.