Self-Synchronized Digital Sampling for Rotating Machinery
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Solution Overview
Problem
Existing methods for digital sampling of accelerometer data in high-speed rotating turbine machinery introduce errors and increase processing requirements due to estimated sampling times and data interpolation, especially during startup and shutdown when rotational speeds change.
Innovation Solution
A self-synchronized digital sampling system that directly coordinates data sample capture with the rotational frequency of the machinery using a synchronizer and analog-to-digital converter, generating a sampling control signal based on the rotational frequency signal to produce synchronous data samples without estimation or interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If estimated sampling times and data interpolation are used to achieve synchronous sampling, then synchronous data samples can be obtained, but errors are introduced into the analysis and processing requirements increase
Solution Approach 1:
The system uses the rotational frequency signal from the machinery itself to generate the sampling control signal through a phase-locked loop, making the sampling process self-synchronized without requiring external estimation or interpolation, thereby eliminating the associated errors
Solution Approach 2:
The phase-locked loop continuously compares the rotational frequency signal with the sampling control signal and adjusts the sampling timing in real-time to maintain synchronization, providing feedback control that eliminates estimation errors
2Measurement precision
If estimated sampling times and data interpolation are used, then synchronous data samples can be obtained, but onboard data processing requirements increase
Solution Approach 1:
The rotational frequency signal from the machinery directly controls the sampling process through the phase-locked loop, eliminating the need for complex post-processing interpolation algorithms and reducing onboard computational requirements
Solution Approach 2:
The system replaces complex software-based interpolation processing with a hardware-based phase-locked loop that directly generates sampling timing signals, simplifying the processing architecture
3Productivity
If standard digital sampling is used during startup and shutdown, then data can be captured, but rotational speed changes cause estimation and calculation errors
Solution Approach 1:
The phase-locked loop dynamically adjusts the sampling frequency to track the changing rotational frequency of the machinery during startup and shutdown, maintaining synchronization accuracy across varying operating conditions
Solution Approach 2:
The sampling frequency is dynamically changed to match the rotational frequency signal in real-time, allowing accurate sampling during speed transitions when fixed-rate sampling would fail
Data Source
AI summary
Systems and methods for self-synchronized data sampling are provided. In one embodiment, a system for capturing synchronous data samples is provided. The system includes an analog to digital converter adapted to capture signals from one or more sensors and convert the signals into a stream of digital data samples at a sampling frequency determined by a sampling control signal; and a synchronizer coupled to the analog to digital converter and adapted to receive a rotational frequency signal from a rotating machine, wherein the synchronizer is further adapted to generate the sampling control signal, and wherein the sampling control signal is based on the rotational frequency signal.