Residual Stress Relief via Harmonic Vibration Frequency Tuning
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Solution Overview
Problem
Existing methods for relieving residual stress in objects using vibration energy are not optimal, as they do not effectively utilize specific vibratory frequencies to maximize stress reduction.
Innovation Solution
A method that applies vibration energy to an object over a test frequency range, identifying a reference frequency where the fundamental wave component's amplitude is one-third of the maximum, and an optimum frequency where the harmonic wave component's amplitude is larger, to achieve maximum stress relief by forcing the object into resonance vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vibration energy is applied at the resonate frequency to maximize vibration amplitude, then the object exhibits maximum vibration amplitude, but the harmonic wave component amplitude is not optimized for stress relief
Solution Approach 1:
The patent changes the vibratory frequency parameter from the traditional resonate frequency to a specific non-resonant frequency where the harmonic wave component amplitude is maximized. This parameter change enables more effective stress relief by utilizing the enhanced harmonic vibrations rather than relying solely on the fundamental resonance vibration.
Solution Approach 2:
The patent applies mechanical vibration energy to the object at a specific frequency to generate harmonic wave components. The vibration process is controlled to produce oscillations that induce plastic deformation and stress relaxation through the harmonic components, achieving superior stress relief compared to conventional resonance-based methods.
2Strength
If the vibrator operates at higher harmonics to increase vibration amplitude, then stress relief improves, but the operating complexity increases
Solution Approach 1:
The patent employs feedback mechanisms to monitor the vibration characteristics of the object and adjust the vibratory frequency accordingly. By detecting the actual vibration response and comparing it with the target harmonic frequency, the system automatically tunes the vibrator to maintain optimal harmonic wave component amplitude, simplifying the overall control process.
Solution Approach 2:
The patent replaces complex mechanical frequency tuning mechanisms with electronic frequency control systems. Modern vibrators utilize electronic circuitry and control algorithms to precisely adjust and maintain the desired vibratory frequency, eliminating the need for complex mechanical adjustment mechanisms while achieving superior stress relief.
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 method significantly reduces residual stress in metal objects by increasing the harmonic wave component's amplitude, demonstrating a stress reduction of up to 53.9% compared to conventional methods.
Implementation Method 1
The object has a resonate frequency, at which the object is forced into resonance vibration and at which the object exhibits a maximum vibration amplitude over frequencies other than the resonate frequency
Implementation Method 2
Each of the wave patterns is composed of a fundamental wave component and a harmonic component having a frequency higher than that of the fundamental wave component
Data Source
AI summary
A method for relieving residual stress in an object includes: (a) applying a vibration energy to the object over a frequency range; (b) monitoring vibration behavior of the object over the frequency range so as to identify a reference frequency, where the vibration amplitude of a fundamental wave component of the wave pattern is approximately one third of a maximum vibration amplitude of a resonate frequency of the object, and an optimum frequency, where the frequency and the vibration amplitude of the harmonic wave component of the wave pattern are respectively larger than those of the harmonic wave component of the wave pattern of the reference frequency; and (c) applying the vibration energy to the object at the identified optimum frequency for an extended period of time.