Helically Wound Driveshaft Damper With Interference-Fit Attenuation Strips
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Solution Overview
Problem
Existing driveshaft dampers are inadequate in effectively attenuating noise, vibration, and harshness (NVH) in power transfer systems, leading to increased wear and reduced operator comfort due to insufficient damping and resonance amplification.
Innovation Solution
The development of helically-wound driveshaft dampers with attenuation strips featuring elongate protrusions, which provide a significant interference fit within the driveshaft, and a core material configuration that absorbs energy and modifies resonance frequencies, enhancing damping and attenuation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional driveshaft dampers are used, then the structure is simple and easy to manufacture, but the NVH attenuation performance is insufficient
Solution Approach 1:
The driveshaft damper uses a composite structure combining a viscoelastic material layer and a constraining layer, creating a layered composite that provides both damping and structural integrity. This composite approach enables effective NVH attenuation while maintaining manufacturability through standard manufacturing processes.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the viscoelastic material, including its loss factor, thickness, and molecular structure, to optimize damping performance across different frequency ranges. These parameter changes enable the material to effectively attenuate NVH while remaining compatible with conventional manufacturing methods.
2Object-affected harmful factors
If the damper structure is made more complex to improve NVH attenuation, then the damping performance improves, but the manufacturing complexity increases
Solution Approach 1:
The damper is segmented into distinct functional layers: a viscoelastic material layer for energy dissipation and a constraining layer for structural support. This segmentation allows each layer to be optimized independently for its specific function while simplifying the overall manufacturing process through modular construction.
Solution Approach 2:
The constraining layer serves multiple functions simultaneously: it provides structural integrity, constrains the viscoelastic material to prevent buckling, and transfers shear stresses to the viscoelastic layer for damping. This multi-functionality reduces the need for additional components, maintaining structural efficiency without increasing complexity.
3Object-affected harmful factors
If the interference fit is increased to improve damping, then the damping performance improves, but the stress on the driveshaft increases
Solution Approach 1:
The patent optimizes the interference fit parameters, including the radial clearance, contact pressure distribution, and engagement length, to achieve effective damping while keeping stresses within acceptable limits. By carefully controlling these parameters, the damper achieves high damping performance without excessive stress on the driveshaft.
Solution Approach 2:
The viscoelastic material layer acts as a flexible intermediary that distributes contact stresses uniformly across the interface between the damper and driveshaft. This flexible layer prevents stress concentration points, allowing for effective interference fit damping while protecting the driveshaft from localized high stresses.
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 proposed solution significantly reduces NVH, improving the operational smoothness and comfort by effectively damping noise and vibration, while also reducing wear on components and shifting resonance frequencies away from problematic ranges.
Implementation Method 1
attenuation strips (e.g., polymeric retaining members) with a plurality of elongate protrusions configured for interference fit within a driveshaft
Implementation Method 2
driveshaft dampers that may be installed in driveshafts to dampen or attenuate noise, vibration, and harshness (NVH)
Implementation Method 3
a core material configuration that absorbs energy and modifies resonance frequencies, enhancing damping and attenuation performance
Implementation Method 4
modifies resonance frequencies, enhancing damping and attenuation performance
Data Source
AI summary
Attenuation strips are provided for use in driveshaft dampers, and driveshaft dampers are provided for use in driveshafts to dampen or attenuate aspects of noise, vibration, and harshness (NVH). Systems and methods for making and using driveshaft dampers are further provided. The driveshaft dampers may be made using a helical-winding process and include attenuation strips with elongate protrusions. Various embodiments of helically-wound driveshaft dampers include a core and one or more attenuation strips helically wound around the core.