Piezo Force Generator with Bending Arm for Vibration Control
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Solution Overview
Problem
Existing force generators for controlling vibrations in structures, such as aircraft, face challenges in adapting to varying frequencies and generate undesirable moments, leading to inefficiencies and increased stress on pilots and passengers due to large size and high dynamic loads.
Innovation Solution
A force generator design featuring piezoelectric transducers attached to both ends of a spring arm with a prestressed bending arm, where the inertial mass is positioned closer to the fixing end, allowing for parallel displacement and reduced moments, and an adaptable resonator system for varying vibration conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spring arm length is increased to reduce bending deformation of piezoelectric transducers, then the transducers are subjected to less tensile load, but the installation space requirement increases
Solution Approach 1:
The system is divided into a spring arm component and a separate bending arm component. The bending arm is attached to the spring arm at a distance from the fixing end, allowing the piezoelectric transducers to be positioned optimally on the bending arm rather than directly on the spring arm. This segmentation enables the spring arm to be shorter while still providing sufficient space for the transducers and reducing their tensile load.
Solution Approach 2:
The bending arm acts as an intermediary element between the spring arm and the inertial mass. It transfers the vibrational forces from the spring arm to the inertial mass while allowing the piezoelectric transducers to be mounted on the bending arm in a position that minimizes tensile loading, thus mediating between the structural requirements and the actuator requirements.
2Force
If the inertial mass is positioned at the end of the spring arm to maximize force generation, then higher force can be generated, but undesirable moments increase significantly
Solution Approach 1:
The force generation function is segmented between the spring arm and the bending arm. The spring arm generates the primary vibrational force through piezoelectric actuation, while the bending arm, positioned at a distance from the fixing end, transfers this force to the inertial mass. This segmentation allows the inertial mass to be positioned optimally to reduce moments while still achieving effective force generation.
Solution Approach 2:
The bending arm extends in a direction parallel to the spring arm but at a different longitudinal position. This spatial arrangement in another dimension (longitudinal position along the arm) allows the inertial mass to be positioned closer to the fixing end, reducing the moment arm and thus the undesirable moments, while still maintaining effective force transmission.
3Length of stationary object
If the piezoelectric transducer is mounted near the structure-side end of the spring arm, then the installation space is reduced, but the transducer experiences higher tensile stress
Solution Approach 1:
The bending arm serves as an intermediary that allows the piezoelectric transducer to be mounted in a position that is optimal for both space utilization and stress reduction. By mounting the transducer on the bending arm rather than directly on the spring arm, the design achieves compact installation while minimizing tensile stress through the mechanical configuration of the bending arm.
4Device complexity
If a single spring arm configuration is used, then the device structure is simplified, but adaptability to varying vibration frequencies is limited
Solution Approach 1:
The system incorporates exchangeable bending arms with different inertial masses that can be swapped depending on the vibration frequency requirements. This dynamic adaptability allows a relatively simple base structure (the spring arm) to be combined with different configurations to handle varying operating conditions, achieving versatility without significantly increasing the complexity of the core structure.
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 design achieves significant reduction in vibrations, enabling longer-term operation by minimizing unwanted moments and allowing for easier adaptation to different vibration frequencies, thus reducing operational restrictions on personnel.
Implementation Method 1
at least one piezoelectric transducer (26) is attached to both ends of the spring arm (14)
Implementation Method 2
a bending arm (22) is attached to the spring arm (14), at the end of which the inertial mass (24) is attached
Data Source
Figure 1~3
Figure 4~15
Figure 6~9
AI summary
The invention relates to a force generator (10a) for mounting on a structure (12) in order to introduce vibrational forces in a controlled manner into said structure for affecting vibrations, comprising at least one spring arm (14) on which a flexural arm (22) having an inertial mass (24) and extending in the direction toward the attaching point is fastened, and having at least one piezo transducer (26) at both ends (16, 18) of the spring arm (14), wherein the center of gravity of the inertial mass (24) is disposed in the region of the center of the spring arm (14). Alternatively, two guide springs are disposed on both sides of the spring arm (14) parallel thereto, in order to generate a vibrational motion, wherein the fastening point of the flexural arm (22) comprises an unchanged orientation during the vibrational motion.