Automatic Trigger Angle Determination for Reciprocating Compressor Rod Drop
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Solution Overview
Problem
Conventional machinery protection systems for reciprocating compressors require manual field testing and expertise to determine the optimal trigger angle, which is prone to errors and time-consuming.
Innovation Solution
A machine monitoring system that automatically calculates the optimal trigger angle by analyzing the rod drop transducer voltage signal and key phase sensor data, eliminating the need for manual measurement tools and expert intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual field testing is used to determine trigger angle, then measurement can be performed, but the process is time-consuming and error-prone
Solution Approach 1:
The system automatically determines the trigger angle using onboard sensors and processing capabilities, eliminating the need for external manual testing. The rod drop transducer and key phase sensor continuously provide data, and the processor automatically calculates the optimal trigger angle without requiring service engineer intervention.
Solution Approach 2:
Manual mechanical measurement tools (oscilloscope, voltage meter, revolution counter) are replaced with an automated electronic system that uses digital signal processing. The processor analyzes voltage signals from sensors and computationally determines the trigger angle, substituting manual mechanical operations with automated electronic computation.
2Ease of manufacture
If manual measurement tools are used, then trigger angle can be determined, but expertise is required and errors are prone
Solution Approach 1:
The system performs self-configuration by automatically calculating the trigger angle from sensor data. The processor executes operational instructions to analyze rod position voltage signals and determine the optimal trigger angle without requiring service engineer expertise or manual intervention.
Solution Approach 2:
The system continuously monitors rod position via the rod position sensor and uses this feedback to automatically adjust and determine the optimal trigger angle. The processor analyzes the voltage signal characteristics and uses this information to reliably establish the configuration parameter.
3Measurement precision
If multiple trigger angle values are tested manually, then optimal angle can be found, but the process is complex and time-consuming
Solution Approach 1:
The system extracts the essential information needed to determine the trigger angle directly from the rod position voltage signal and key phase sensor data. By focusing on the specific voltage characteristics at different angles, the system eliminates the need for multiple manual test iterations and complex procedural steps.
Solution Approach 2:
The system continuously collects and analyzes sensor data during normal operation to pre-determine the optimal trigger angle before it is needed for monitoring. This preliminary automatic determination eliminates the need for complex manual testing procedures when configuration is required.
Data Source
AI summary
A machine monitoring system automatically determines an optimal trigger angle for monitoring the rod drop of a reciprocating compressor, and sets the trigger angle configuration value accordingly. A key pulse is monitored using a key phase sensor, the amplitude of the rod drop transducer voltage versus time (or rotation angle) is analyzed, and a position of the minimal change in slope of the rod drop transducer voltage signal relative to the key mark is determined. The optimal trigger angle is determined based on this temporal position, the current speed and the configured piston angle. The optimal trigger angle is provided to the machine monitoring system for configuration. The system thereby relieves the service engineer from having to test several trigger angles with manually-operated test instruments to determine the optimal trigger angle.