Piezo Drive Damping Layer Resonance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezo drives in geodetic and coordinate measuring devices face challenges with unwanted vibrations and noise, power losses, and thermal expansion issues due to the interaction between piezo oscillators and running surfaces, particularly in rotating configurations with ceramic components, which affect precision and reliability across varying temperatures and humidity levels.
Innovation Solution
The solution involves designing the connection between the running surface components and their receptacles with an intermediate layer that provides mechanical decoupling and damping, using a soft adhesive with fillers to shift natural resonances outside the operating window of the piezoelectric drive, and incorporating a damping layer to absorb vibration amplitudes and maintain stability across temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a ceramic ring is used as the running surface component to reduce wear, then durability is improved, but unwanted vibrations and noise increase due to resonance excitation
Solution Approach 1:
An intermediate layer is introduced between the ceramic ring and the receptacle to act as a mediator that dampens vibrations and reduces noise. This layer absorbs the harmful vibrational energy generated during operation while allowing the ceramic ring to maintain its wear-resistant properties.
Solution Approach 2:
The resonance vibrations that initially cause harmful noise and vibrations are converted into beneficial damping effects through the intermediate layer. The layer is designed to absorb these vibrations and dissipate them as heat, transforming the harmful resonant energy into a stabilizing force that reduces noise and vibration.
2Stability of the object's composition
If the running surface component is rigidly connected to the receptacle, then structural stability is improved, but natural resonances fall within the operating frequency window causing vibrations
Solution Approach 1:
The connection parameters between the running surface component and receptacle are changed by introducing an intermediate layer with specific damping properties. This layer modifies the natural frequencies of the system, shifting them outside the operating frequency window to avoid resonance-induced vibrations while maintaining structural stability.
3Strength
If ceramic components are used, then compressive strength is improved, but tensile strength is weak and statistically widely scattering
Solution Approach 1:
A composite structure is created by combining the ceramic running surface component with a damping layer material that has complementary mechanical properties. This composite construction compensates for the weak and variable tensile strength of ceramic while preserving its high compressive strength and wear resistance.
4Productivity
If the piezo oscillator operates at high frequency, then productivity is improved, but power losses and noise increase due to resonance
Solution Approach 1:
The intermediate damping layer converts the harmful resonant vibrations that cause power losses into beneficial vibration absorption. By dissipating the resonant energy as heat rather than allowing it to propagate through the system, the layer reduces power losses and noise while enabling high-frequency operation.
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 reduces unwanted vibrations and noise, enhances power efficiency, and ensures reliable operation across a wide temperature range by optimizing the vibration behavior and resonance frequencies, thereby improving the precision and durability of piezo drives in high-precision devices.
Implementation Method 1
an intermediate layer, in particular in the form of an adhesive layer, which has decoupling and/or damping properties
Implementation Method 2
the components and their connection are designed so that any interfering resonances in the running surface components and their receptacles are placed or shifted
Implementation Method 3
The spatially oscillating or oscillating movement is brought about by the coordinated arrangement and interconnection of piezoelectric materials
Implementation Method 4
the contact element contacting the running surface under pressure causing an advance. This coupling transmits a driving force
Implementation Method 5
the adhesive layer, in particular the joint gap and running surface geometry are matched to one another and, if necessary, by adding fillers, the adhesive bond is optimized so that the resonances do not lie within the operating window
Data Source
Figure 1~2b
Figure 3~5
Figure 6~7
AI summary
The invention relates to a piezo drive, in particular for use in geodesic devices, having at least one piezoelectric motor element (2) that includes an advancing component, a running surface component (10C), and a receptacle for the running surface component (10C), wherein said receptacle is to be connected to a component to be driven, wherein the piezoelectric motor element (2) has a window of operation of the motor as a frequency range of the movement of the advancing component. The running surface component (10C) and the receptacle (9C) are sized and connected to one another such that the natural resonances of the running surface component (10C) lie outside the window of operation of the motor.