Material Testing Machine Gain Tuning for Filtered Load Control
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Solution Overview
Problem
Conventional material testing machines face instability in control due to time delays from low-pass filters, leading to suboptimal responsiveness when control gains are set low to maintain stability, despite the ability to adjust low-pass filter settings.
Innovation Solution
A material testing machine with a control unit that determines appropriate control gains, specifically proportional and integral gains, based on stability criteria when low-pass filter settings are changed, ensuring both stability and responsiveness by using discriminants and approximating transfer function orders for arithmetic simplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If control gain is increased to improve responsiveness, then responsiveness is improved, but control stability deteriorates
Solution Approach 1:
The control gain is made dynamic by automatically adjusting it according to the low-pass filter cutoff frequency setting. The control unit calculates appropriate control gains based on the filter parameters, transforming the static control gain into a dynamic parameter that adapts to changing filter settings, thereby resolving the contradiction between responsiveness and stability.
Solution Approach 2:
The invention changes the control gain parameter based on the low-pass filter cutoff frequency parameter. By establishing a mathematical relationship between these parameters and calculating the control gain that ensures system stability for each filter setting, the system optimizes both responsiveness and stability through coordinated parameter adjustment.
2Object-affected harmful factors
If low-pass filter cutoff frequency is reduced to reduce disturbance noise, then noise reduction is improved, but control stability deteriorates due to time delay
Solution Approach 1:
The control unit continuously monitors the low-pass filter setting and automatically adjusts the control gain in response. This feedback mechanism ensures that when the cutoff frequency is reduced for better noise filtering, the control gain is simultaneously adjusted to compensate for the increased time delay, maintaining system stability.
3Stability of the object's composition
If control gain is set low to ensure stability, then control stability is improved, but responsiveness deteriorates
Solution Approach 1:
Instead of using a fixed low control gain, the system dynamically determines the appropriate control gain based on the low-pass filter settings. This allows the control gain to be optimized for each specific filter configuration, achieving both stability and responsiveness without being constrained by a conservative fixed value.
Data Source
AI summary
In a case where control input is performed via a low-pass filter, a control gain more appropriate for both stability and responsiveness is set according to setting of the low-pass filter. A control unit (21) performs control input for a load mechanism (40) via a low-pass filter, discriminates a stability of a control system including the load mechanism (40) and the low-pass filter when setting of the low-pass filter is changed, sets an appropriate control gain based on a maximum control gain at which an excess amount of a measured value with respect to a target value is equal to or less than a predetermined value within a range where that the control system is stable, and controls an operation of the load mechanism (40) by using the appropriate control gain.