Multiaxial Vibroacoustic Interface for Noise Control
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Solution Overview
Problem
Multiaxial electrohydraulic vibration systems generate noise that interferes with the acoustic characterization of components during testing, making it difficult to analyze the noise of components subjected to multiaxial vibratory signals due to the complexity of acoustic insulation and the need for maximum movement in all spatial degrees of freedom.
Innovation Solution
A multiaxial vibroacoustic interface is used within an anechoic or semi-anechoic chamber, incorporating a multilayer textile block with acoustically absorbent material and a multiperforated protective plate to minimize noise transmission while allowing full movement range, integrated with rigid and flexible elements for structural fixation and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If acoustic insulation is added to the multiaxial electrohydraulic vibration system, then noise transmission is reduced, but the movement range of the system is restricted
Solution Approach 1:
The acoustic insulation system is divided into multiple independent absorptive elements distributed across the vibration system. Each element provides localized noise absorption without collectively restricting the overall movement range of the multiaxial electrohydraulic vibration system.
Solution Approach 2:
Acoustic absorption properties are applied locally at specific positions where noise generation occurs, rather than using a complete enclosing structure. This allows noise reduction at critical areas while maintaining open spaces necessary for the full movement range of the vibration system.
2Object-affected harmful factors
If a complete acoustic insulation enclosure is used, then noise transmission is minimized, but the complexity of the system increases
Solution Approach 1:
The acoustic insulation is extracted from a complete enclosure concept and implemented only as necessary distributed absorptive elements. This removes the complexity of a full enclosure while retaining the essential noise reduction function.
Solution Approach 2:
Porous acoustic absorption materials are used to provide effective noise reduction with simple, lightweight structures. These materials achieve acoustic insulation without requiring complex solid barriers or enclosures.
3Object-affected harmful factors
If heavy acoustic insulation materials are used, then noise transmission is reduced, but the weight of the vibration system increases
Solution Approach 1:
Porous acoustic absorption materials are used instead of dense heavy materials. These porous structures provide effective noise absorption through their internal structure rather than mass, significantly reducing the weight of the acoustic insulation system.
Solution Approach 2:
Composite acoustic materials combining different lightweight porous structures are used to achieve effective noise reduction with minimal weight. The composite structure optimizes acoustic performance while maintaining low weight for the moving components.
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 solution effectively reduces noise transmission, enabling accurate acoustic characterization of components under multiaxial vibration without restricting the movement of the vibration system, using the absorption properties of the materials to control noise within the testing environment.
Implementation Method 1
incorporating a multilayer textile block with acoustically absorbent material to minimize noise transmission
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a multiaxial vibroacoustic interface (4) for a multiaxial electrohydraulic vibration system (2) for acoustic characterisation, the multiaxial vibroacoustic interface (4) comprising a multiperforated protective plate (7) for receiving a plurality of rigid studs (6) to fix a test sample (14); an insulating foam (8) to be situated on the work platform (9) of the multiaxial electrohydraulic vibration system (2); an insulation block (5) comprising a cover of flexible fabric filled with acoustically absorbent material where the insulation block (5) is configured to group the multiperforated protective plate (7), the insulating foam (8) and fix it to the multiaxial electrohydraulic vibration system (2).