Mechanical Resonator in Ultrasonic Vibration Systems for Waveform Stability
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Solution Overview
Problem
Ultrasonic oscillation systems face issues with waveform distortion and increased temperature of piezo ceramics due to undesirable vibrations when processing hard materials, leading to reduced operating time and potential ceramic defects.
Innovation Solution
Incorporating a mechanical resonator with a mass larger than the sonotrode, positioned between the converter and sonotrode or amplitude transformer, to attenuate unwanted vibrations and maintain the desired oscillation shape, potentially replacing or enhancing the amplitude transformer to filter out distortion components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sonotrode processes hard materials with a sealing surface, then material processing capability is improved, but waveform distortion and unwanted vibrations increase
Solution Approach 1:
A mechanical resonator with mass mr is introduced as an intermediary component between the converter and sonotrode. This resonator acts as a buffer that filters unwanted vibrations and waveform distortions generated during hard material processing, while still transmitting the necessary ultrasonic energy for material processing.
Solution Approach 2:
The system changes the mass parameter by introducing a resonator with mass mr that is at least 100% (preferably 150-200%) larger than the sonotrode mass ms. This mass parameter change enables the resonator to effectively attenuate unwanted vibrations through its inertial properties.
2Productivity
If the sonotrode contacts hard materials, then processing effectiveness is improved, but piezo ceramic temperature increases
Solution Approach 1:
The mechanical resonator serves as a mediator that decouples the harsh mechanical interactions between the sonotrode and hard materials from the sensitive piezo ceramics. By absorbing and filtering vibrations, the resonator protects the piezo elements from thermal overload while maintaining processing effectiveness.
Solution Approach 2:
The resonator provides beforehand cushioning by being positioned between the converter and sonotrode to preemptively absorb and attenuate unwanted vibrations before they can propagate back to the piezo ceramics, preventing thermal damage before it occurs.
3Manufacturing precision
If the sealing surface oscillates with constant amplitude, then uniform ultrasonic application is improved, but unwanted vibration modes are excited
Solution Approach 1:
The mechanical resonator acts as a filter that allows the sonotrode sealing surface to maintain constant amplitude oscillation for uniform ultrasonic application, while simultaneously suppressing unwanted vibration modes generated by material contact through its resonant filtering properties.
4Productivity
If welding time is extended or breaks are reduced, then productivity is improved, but piezo ceramic service life decreases
Solution Approach 1:
The mechanical resonator enables continuous or extended welding operations by protecting the piezo ceramics from vibration-induced thermal damage. This intermediary component allows longer operating cycles without compromising ceramic service life, thereby improving overall productivity.
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 configuration significantly reduces unwanted vibrations transferred to the converter, extending the service life of piezo elements by maintaining the desired oscillation shape and reducing thermal stress on the ceramics.
Implementation Method 1
a mechanical resonator of mass mr, which can be brought into resonant oscillation with an oscillation with the wavelength λ
Implementation Method 2
distortions of the desired oscillation form are considerably attenuated
Implementation Method 3
a converter which can convert an electrical alternating voltage into a mechanical oscillation
Implementation Method 4
the sonotrode coming into contact with the materials to be processed and exciting them at their interfaces with an ultrasonic oscillation so that heat can be generated locally
Data Source
AI summary
An ultrasonic oscillation system with a converter which can convert an electrical alternating voltage into a mechanical oscillation, and a sonotrode of mass ms, which is intended to be set into oscillation with the mechanical oscillation, the converter being coupled to the sonotrode in such a way that the vibration generated by the converter generates a vibration excitation of the sonotrode, the ultrasonic vibration system being intended to be operated with a vibration of wavelength λ. In order to provide an ultrasonic oscillation system in which the problems described are at least reduced, the ultrasonic oscillation system has a mechanical resonator of mass mr, which can be brought into resonant oscillation with an oscillation of wavelength λ, the mass mr of the resonator being larger than the mass ms of the sonotrode.