Dynamic Characterization System for CNC Machine Vibration Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current systems for measuring dynamic responses of CNC machines, such as natural frequencies and vibration modes, are inaccurate due to operator-dependent manual testing and cannot determine structural dynamics effectively, leading to unnecessary maintenance and costs.
Innovation Solution
A dynamic characterization system comprising a piezoelectric actuator, accelerometer, and controller with a wireless transceiver, which generates a controlled excitation signal and measures dynamic energy, allowing for automated and accurate determination of machine dynamics without operator error, enabling real-time vibrational analysis during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual offline testing with instrumented hammer is used to measure machine structural dynamics, then operator can perform vibration measurements, but measurement precision deteriorates due to operator error and unknown varying force applied
Solution Approach 1:
The patent replaces the manual mechanical hammering method with an automated electrodynamic shaker system. The shaker is driven by a signal generator and amplifier to produce controlled excitation forces, eliminating operator variability. The system uses a force transducer to precisely measure the actual excitation force applied, enabling accurate frequency response function measurements without operator error.
Solution Approach 2:
The system performs self-calibration and automated measurements without requiring operator intervention during the measurement process. The computer controls the signal generation, data acquisition, and analysis automatically, reducing human error and improving measurement consistency.
2Reliability
If periodic preventative maintenance is performed on CNC machine components, then machine reliability is maintained, but productivity deteriorates due to machine downtime and operator time loss
Solution Approach 1:
The system performs preliminary dynamic characterization measurements during setup and before machining operations to establish baseline machine dynamics. This allows operators to understand machine behavior in advance and adjust machining parameters proactively to avoid vibrations and tool wear, preventing the need for premature maintenance shutdowns.
Solution Approach 2:
The system continuously monitors machine dynamic response during operation and provides feedback on tool condition and machine health. By tracking changes in frequency response functions over time, the system can detect tool wear or machine degradation early, allowing maintenance to be scheduled based on actual condition rather than fixed intervals, thus minimizing unnecessary downtime.
3Productivity
If existing CIAB system is used to measure vibrations during cutting, then vibration monitoring is available, but measurement precision deteriorates because the system cannot determine machine structural dynamics
Solution Approach 1:
The system separates the measurement of machine structural dynamics from the measurement of cutting vibrations. It uses a dedicated excitation system to measure the machine's frequency response function first, establishing the machine's natural frequencies and mode shapes. Then, during cutting operations, it monitors vibrations separately, allowing accurate interpretation of cutting vibrations by referencing the known machine dynamics characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides precise and consistent measurement of dynamic responses, reducing maintenance costs and improving operational stability by allowing for continuous monitoring and characterization of CNC machine dynamics, even in areas inaccessible to operators.
Implementation Method 1
The vibration mechanism is piezoelectric actuator
Implementation Method 2
The accelerometer is operable to measure dynamic energy in response to the excitation signal and output a dynamic response signal indicative of the dynamic energy
Data Source
AI summary
The present disclosure relates to a system for measuring a dynamic response of a machine. The system includes a vibration mechanism, an accelerometer, a controller and a casing. The vibration mechanism is operable to generate an excitation signal, and the accelerometer is operable to measure dynamic energy in response to the excitation signal and output a dynamic response signal indicative of the dynamic energy. The controller includes a communication interface and operates the vibration mechanism to output the excitation signal and transmit a vibration input signal based on the excitation signal by way of the communication interface. The casing houses the vibration mechanism and the controller.