Rotary Machine State Observation Device Low-Speed Sampling
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Solution Overview
Problem
Existing rotary machine state observation devices require high-speed sampling to accurately detect the distance between an impeller and a casing, leading to increased costs due to the need for high-performance analog-digital converters.
Innovation Solution
A rotary machine state observation device that digitizes detection signals at a predetermined sampling period, separates the signals into vane and non-vane detection signals, and determines the impeller state by comparing these signals to extract the vane detection signal corresponding to the peak, allowing for state observation without high-speed sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed sampling is performed to accurately detect the distance between the impeller and detection means, then measurement precision is improved, but device complexity and cost increase due to requiring high-performance analog-digital converters
Solution Approach 1:
The patent segments the detection signal processing into two stages: first, low-speed sampling to capture basic signal characteristics; second, peak detection and comparison to identify vane-specific signals. This segmentation allows accurate impeller state detection without requiring high-speed sampling throughout the entire signal processing chain, thereby reducing converter performance requirements and device complexity.
Solution Approach 2:
Instead of continuously performing high-speed sampling on all detection signals, the patent applies partial action by selectively processing only the peak portions of the signal where vane detection information is present. The comparison with reference signals ensures that partial sampling at lower speeds still captures sufficient information for accurate impeller state determination.
2Reliability
If high-speed sampling is performed to capture vane detection signals, then reliability of vane detection is improved, but loss of time increases due to the extremely short time intervals at high rotation speeds
Solution Approach 1:
The patent performs preliminary action by pre-storing reference detection signals that correspond to the positions of multiple vanes. During operation, these reference signals are used to quickly identify and extract vane detection signals from the sampled data without requiring exhaustive high-speed sampling of every signal point, thereby maintaining detection reliability while reducing the effective sampling time required.
Solution Approach 2:
The patent creates copies of reference detection signals for each vane position and uses these copies to compare against the actual detection signals. This copying approach allows the system to reliably identify vane signals through pattern matching rather than requiring high-speed sampling, effectively reducing the time loss associated with capturing fast-moving vane information.
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 the observation of rotary machine states without the need for high-speed sampling, reducing the requirement for costly high-performance conversion equipment and maintaining accurate detection of impeller states.
Implementation Method 1
detection means for detecting a distance between an impeller of a rotary machine and the detection means
Data Source
AI summary
A state observation device (30) uses an ADC (37) to digitize a detection signal from a gap sensor (21) at a low-speed sampling period and uses a separation unit (38) to separate the digitized detection signal into vane detection signals considered to be for the detection of a vane of a compressor impeller and non-vane detection signals considered not to be for the detection of a vane. Further, the determination unit (39) extracts a vane peak detection signal considered to be for a vane peak by comparing a vane detection signal with vane detection signals corresponding to other vanes and non-vane detection signals, and a shaft vibration and tip clearance are determined as states of the compressor impeller on the basis of the extracted vane peak detection signal. Thus, the state observation device (30) is capable of observing the state of a rotary machine without carrying out high-speed sampling.