Rotatory Drive Control for Track Maintenance Phase Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for regulating the rotatory drives of track maintenance machines lack precision in determining frequency and phase changes, leading to delayed recognition of frequency adjustments and suboptimal synchronization of vibration generators.
Innovation Solution
The method employs auto- and cross-correlation of time-discrete measurement values to determine frequency and phase offsets with high accuracy, using sensors to record periodic parameters and a calculation unit for real-time evaluation, and incorporates IIR filters for signal preparation and interpolation to enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional zero-stage recording methods are used for frequency determination, then the measurement system is simple, but the precision of frequency determination is insufficient and delayed recognition of frequency changes occurs
Solution Approach 1:
The patent implements dynamic frequency determination through auto-correlation calculations that continuously update with new measurement values. The system transitions from static zero-stage recording to dynamic correlation-based frequency tracking, enabling immediate detection of frequency changes while maintaining computational efficiency through iterative calculation methods.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing measurement values in a buffer before performing correlation calculations. This allows the system to quickly compute frequency changes without real-time calculation delays, as the necessary data is already prepared and organized for rapid correlation analysis.
2Stability of the object's composition
If phase stabilisation of multiple vibration generators is implemented, then synchronization is improved, but the complexity of coordinating multiple drives increases
Solution Approach 1:
The patent implements feedback-based phase stabilisation by continuously monitoring the phase relationships between multiple vibration generators and applying corrective control signals. The cross-correlation method provides real-time phase difference measurements that feed back to the control system, enabling automatic phase synchronization without complex manual coordination.
Solution Approach 2:
The patent achieves phase equipotentiality by synchronizing all vibration generators to operate at the same phase reference level. Through cross-correlation analysis and coordinated control, the system equalizes the phase relationships between drives, minimizing vibration overlaps and creating a balanced operational state across all generators.
3Productivity
If high-frequency vibration is used during tamping tine submersion, then the submersion process is improved, but noise pollution increases
Solution Approach 1:
The patent applies dynamic frequency adjustment by varying the vibration frequency according to the operational phase. During tamping tine submersion, high frequency (42-50 Hz) is used for efficient penetration, while during lifting and idle phases, the frequency is reduced to approximately 28 Hz, minimizing noise pollution when high productivity is not required.
Data Source
AI summary
A method for controlling/regulating a rotatory drive of a working unit of a track maintenance machine includes using a sensor to record a measurement parameter with an approximately periodic history function derived from a rotation of the drive. A frequency or period duration of the history function is determined with an evaluation device, and the frequency or period duration is compared with a target parameter for stipulating a control signal. A number of time-discrete measurement values is formed for the measurement parameter and an auto-correlation of these measurement values is carried out by a calculation unit for determining the frequency or the period duration. As compared to a conventional method with zero stage recording, a precise recording of frequency changes is therefore also possible between two zero stages. A device for carrying out the method is also provided.