Time Series Data Display for Servo Adjustment
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Solution Overview
Problem
In machine tools controlled by numerical control devices, the separate measurement of machine end position and drive axes position feedback data using different instruments makes it difficult to compare and adjust servo systems effectively, as the data is acquired at different sampling periods, hindering proper servo adjustments.
Innovation Solution
A time series data display device that acquires position feedback data from drive axes, position command data, and actual position data, calculates and converts these into comparable formats, and displays them in a unified manner, allowing for the visualization of intersection points between command and actual trajectories, facilitating servo adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If position feedback data and actual position data are acquired by separate measuring instruments with different sampling periods, then measurement independence is maintained, but data comparability deteriorates
Solution Approach 1:
The patent changes the sampling period parameter of one of the measuring instruments to match the other, enabling synchronized data acquisition. By adjusting the sampling frequency to a common value, the system maintains measurement independence through separate instruments while achieving data comparability through unified sampling timing.
Solution Approach 2:
The patent introduces a data processing unit that acts as an intermediary between the two measuring instruments. This unit synchronizes the data from both instruments by adjusting timing and interpolation, allowing independent measurements to be compared effectively without requiring the instruments themselves to be modified.
2Reliability
If position data from machine end and drive axes are displayed separately, then data integrity is preserved, but servo adjustment effectiveness deteriorates
Solution Approach 1:
The patent merges the separate position data from the machine end and drive axes into a unified display. By combining these data streams in the display unit with proper alignment and synchronization, the system preserves the integrity of each data source while enabling direct visual comparison to facilitate effective servo adjustments.
Solution Approach 2:
The patent adds a temporal dimension to the display by showing position data versus time for both machine end and drive axes. This time-series visualization allows operators to see the dynamic relationship between commanded and actual positions, making servo adjustment effects immediately visible and actionable.
3Loss of information
If multiple types of position data are displayed in different formats, then data specificity is maintained, but comparison capability deteriorates
Solution Approach 1:
The patent applies different display formats to different data types locally, with each data type (machine end position, drive axis position, command trajectory, actual trajectory) having its own optimized visualization. Simultaneously, the system provides a unified comparison view where all data are aligned temporally and spatially, allowing operators to maintain data specificity while achieving comparison capability.
Data Source
AI summary
A time series data display device calculates position data in time-series of a movement point on drive axes based on the position feedback data, generates a command movement trajectory of the machine end based on the position command data, generates an actual movement trajectory of the machine end based on the actual position data, calculates position data of the machine end which are intersection points between straight lines, which are perpendicular to the command movement trajectory and pass through the movement point, and the actual movement trajectory, converts the position data of the machine end to position data with respect to drive axes, and displays the position feedback data in time-series and the position data in time-series.