Ultrasonic Piezoelectric Frequency Control for Stable Resonance

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Solution Overview

Problem

Existing ultrasonic-based material processing apparatuses face instability due to variations in the resonant frequency of piezoelectric elements, leading to inefficient energy transfer and potential damage from incorrect driving conditions.

Innovation Solution

An ultrasonic-based material processing apparatus that monitors the resonant frequency of piezoelectric elements and controls power supply to apply multiple driving frequencies, including a first frequency higher and a second frequency lower than the resonant frequency, adjusted by offset information based on the processing target material, to stabilize operation and enhance energy transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed driving frequency is applied to the piezoelectric element, then the control system is simple, but the operation becomes unstable when resonant frequency varies

Engineering Contradiction:

Improveoperation stabilityVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs preliminary action by measuring the resonant frequency of the piezoelectric element before applying the driving frequency. The controller detects the actual resonant frequency through impedance measurement or vibration detection, then adjusts the driving frequency to match this measured value, ensuring stable operation from the start

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously monitoring the resonant frequency of the piezoelectric element and adjusting the driving frequency accordingly. The controller receives feedback about frequency drift or variations and dynamically modifies the driving parameters to maintain optimal resonance conditions, thereby ensuring stable operation

Inventive Principle:

Principle #23Feedback

2Reliability

If the driving frequency is adjusted to match resonant frequency variations, then operation stability improves, but the device complexity increases

Engineering Contradiction:

Improveresonance condition maintenanceVSAvoidfrequency control complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system applies self-service by enabling the piezoelectric element itself to provide information about its resonant frequency through its electrical characteristics (impedance, current, or voltage). The controller measures these characteristics and automatically determines the resonant frequency without requiring external calibration or complex measurement equipment, allowing the system to self-adjust and maintain optimal resonance conditions

Inventive Principle:

Principle #25Self-service

3Measurement precision

If test power is supplied to determine resonant frequency, then frequency accuracy improves, but energy consumption increases

Engineering Contradiction:

Improveresonant frequency detection accuracyVSAvoidpower consumption during measurement

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The system applies partial action by supplying test power at reduced amplitude or for limited time intervals only when frequency measurement is required, rather than continuously. The controller performs frequency detection using minimal test power and then switches to normal operating mode, thereby achieving accurate frequency measurement while minimizing energy consumption during the measurement process

Inventive Principle:

Principle #16Partial or excessive action

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 apparatus ensures stable operation of piezoelectric elements by adjusting driving frequencies to match actual resonant frequencies, allowing efficient energy transfer and adjustment to changes in the processing environment, thereby optimizing ultrasonic processing.

Implementation Method 1

an ultrasonic generation unit disposed on a lateral surface of the ultrasonic transfer unit and including a piezoelectric element configured to generate ultrasonic waves

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

It is important to maintain a resonance condition for the piezoelectric element

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS20260061458A1Ultrasonic-based material processing apparatus and control method thereof

Publication Date: 2026.03.05 FUST LAB CO LTD

AI summary

An ultrasonic-based material processing apparatus includes an ultrasonic transfer unit configured to accommodate a processing target material, an ultrasonic generation unit disposed on a lateral surface of the ultrasonic transfer unit and including a piezoelectric element configured to generate ultrasonic waves, a power supply unit configured to output driving power to the ultrasonic generation unit, and a controller. The controller controls the power supply unit to supply test power to the ultrasonic generation unit, determines the resonant frequency of the piezoelectric element based on the output of the piezoelectric element as a response to the test power, determines a first driving frequency and a second driving frequency based on the resonant frequency, and controls the power supply unit to apply first driving power having the first driving frequency and second driving power having the second driving frequency to the ultrasonic generation unit.