Machine Element Movement Guidance via Dynamic Simulation Model
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Solution Overview
Problem
Existing methods for guiding the movement of machine elements, such as machine tools, often result in reduced dynamics and increased fabrication costs due to jerk limitation and vibration issues, which are not adequately addressed by current techniques like cam disks and linear filters.
Innovation Solution
A method and device that utilize a system model to simulate the dynamic behavior of machine elements, generating actual precontrol and reference variables to optimize motor control, allowing for real-time adaptation and improved movement guidance without precalculations, and incorporating a controlled linear system model with feedback for enhanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If jerk limitation is applied to reduce vibration, then manufacturing precision is improved, but dynamics of movement operation deteriorates
Solution Approach 1:
The patent changes the control parameter from direct jerk limitation to natural frequency-based control. By identifying critical natural frequencies of the machine elements and controlling the excitation frequencies to avoid resonance, the system achieves both vibration reduction and maintained dynamics. This is accomplished through adaptive control algorithms that adjust movement parameters in real-time based on measured natural frequencies.
2Manufacturing precision
If path speed is reduced to comply with jerk limitations, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent transforms the control approach from speed reduction to frequency-based optimization. By controlling excitation frequencies away from critical natural frequencies rather than simply reducing speed, the system maintains higher path speeds while achieving vibration reduction. This allows faster fabrication cycles without sacrificing precision, thereby improving productivity.
3Object-affected harmful factors
If linear filters are used to reduce spectral components at critical frequencies, then vibration is reduced, but signal delay increases leading to fabrication inaccuracies
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal movement trajectories that inherently avoid excitation of critical natural frequencies. Instead of filtering signals in real-time (which causes delay), the system pre-computes vibration-free paths and stores them for direct execution. This eliminates signal delay while maintaining vibration reduction, as the trajectories are designed to avoid resonance from the outset.
Data Source
AI summary
The invention relates to a method for guiding the displacement of a displaceable machine element (18) in a machine, comprising the following steps: a) specification of a guide target variable (xtarg) that describes the desired displacement operation of the machine element (18); b) determination of a pilot actual variable (Mpilot) and/or a guide actual variable (xact) from the guide target variable (xtarg) using a model (2), said model (2) comprising a path model (3), which simulates the dynamic behaviour of the elements (16, 18) involved in the displacement. The invention also relates to a device that corresponds to the method. The invention permits the optimised guidance of the displacement of a displaceable machine element (18) in a machine.