Vibratory Stress Relief Frequency Selection Using Stress-Energy Matching
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Solution Overview
Problem
The existing sweeping frequency method for determining excitation frequency in vibratory stress relief technology does not effectively consider the residual stress distribution state of components, leading to inefficient residual stress elimination and limited vibration energy distribution when using multi-frequency coupled systems.
Innovation Solution
A system comprising a host computer system, arbitrary waveform generation card, vibration exciter, acceleration sensor, charge amplifier, and data acquisition card, which uses finite element numerical simulation and Fourier transform to determine the excitation frequency by matching the distribution region of peak residual stress with peak vibration energy, selecting the frequency with the maximum voltage peak difference for optimal stress relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sweeping frequency method is used to determine excitation frequency, then the natural frequency of the component can be found, but the residual stress distribution state is not considered leading to inefficient stress relief
Solution Approach 1:
The patent performs preliminary finite element simulation before the actual vibratory stress relief process to predict the component's vibration modes and natural frequencies. This preliminary analysis allows optimization of excitation frequency selection based on residual stress distribution characteristics, avoiding the need to rely solely on sweeping frequency methods during the actual treatment process.
Solution Approach 2:
The patent implements a feedback mechanism where acceleration sensors monitor the component's vibration response during excitation, and the measured data is used to adjust and optimize the excitation frequency in real-time. This closed-loop control ensures that the excitation frequency remains aligned with the component's dynamic characteristics and residual stress distribution.
2Adaptability or versatility
If multi-frequency coupled vibration is used to treat the component, then various frequency points can be covered, but the vibration energy at each frequency point becomes very limited
Solution Approach 1:
The patent extracts and focuses on the most critical frequency components identified from finite element simulation and experimental measurement. Instead of applying multi-frequency vibration simultaneously, the system selectively applies vibration at specific dominant frequencies where the component exhibits maximum response and where residual stress relief is most effective, thereby concentrating energy where it is most needed.
3Productivity
If the output energy of the exciter is increased to improve multi-frequency coupling effect, then the vibratory stress relief effect can be improved, but the system complexity and cost increase
Solution Approach 1:
The patent applies vibration energy that is sufficient to achieve effective stress relief at the selected dominant frequencies, without excessively increasing the overall output energy. By targeting specific frequency components rather than distributing energy across multiple frequencies, the system achieves effective stress relief with moderate excitation levels, avoiding the need for high-power exciters and complex control systems.
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
This approach enhances the efficiency of vibratory stress relief by ensuring the excitation frequency aligns with the component's stress and energy distribution, improving the residual stress elimination effect and reducing the workload of the system.
Implementation Method 1
the excitation signal outputted by the arbitrary waveform generation card controlled by the host computer system is inputted to the vibration exciter via the driver, thereby driving the vibration exciter to generate vibration
Implementation Method 2
the acceleration sensor is mounted on the component, the acceleration sensor is connected to the input port of the charge amplifier
Data Source
AI summary
A method for determining the excitation frequency of vibratory stress relief by employing a system for determining the excitation frequency of vibratory stress relief is disclosed, comprising the steps of: connecting the component to the system for determining excitation frequency of vibratory stress relief; selecting a group of preferred excitation frequency of the vibratory stress relief according to the results of numerical simulation; obtaining the reference voltage peak of the sinusoidal signal from the preferred excitation frequency, and transforming the sinusoidal signal into an excitation signal for vibratory stress relief treatment; converting the vibration signal of the component during vibratory stress relief treatment into voltage signal to obtain the actual voltage peak; comparing the actual voltage peak with the reference voltage peak, and selecting the frequency with the maximum difference of voltage peak as the excitation frequency for the vibratory stress relief treatment.