Dual-Tuned Vibration Damper for Driveline Frequency Attenuation
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Solution Overview
Problem
Current vibration damping solutions for automotive drivelines require multiple discrete dampers, which are costly and difficult to integrate, and altering powertrain operational characteristics to attenuate vibrations can negatively impact vehicle mileage.
Innovation Solution
A dual-tuned vibration damper system with a hub, first and second masses, and resilient couplings is used to attenuate vibrations at specific frequencies, where the first mass and resilient coupling address higher frequencies, and the second mass and resilient coupling address lower frequencies, allowing for efficient vibration damping without altering powertrain characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple discrete vibration dampers are used to attenuate vibrations at different frequencies, then vibration attenuation effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple vibration damping functions into a single integrated damper unit. The damper includes a housing with multiple damping elements (such as viscoelastic materials and metal springs) that can attenuate vibrations at different frequencies simultaneously. This merging approach eliminates the need for multiple separate dampers, reducing device complexity and installation requirements while maintaining comprehensive vibration attenuation effectiveness across multiple frequency ranges.
2Object-affected harmful factors
If powertrain operational characteristics are altered to attenuate vibrations, then vibration transmission is reduced, but vehicle mileage deteriorates
Solution Approach 1:
The patent extracts the vibration attenuation function from the powertrain operational characteristics and relocates it to a dedicated vibration damper system. Instead of modifying how the powertrain operates (which would affect fuel efficiency), the invention uses passive damping elements (viscoelastic materials and metal springs) that absorb and dissipate vibrations mechanically. This separation allows vibration control without impacting powertrain efficiency or vehicle mileage.
Solution Approach 2:
The patent converts harmful vibrations into beneficial energy dissipation through viscoelastic materials and metal springs. These damping elements transform mechanical vibration energy into heat through internal friction and hysteresis, effectively attenuating vibrations at multiple frequencies. By converting the harmful vibrational energy into a controlled dissipation process, the system protects the driveline without requiring active powertrain modifications that would reduce mileage.
3Reliability
If two discrete vibration dampers are integrated into the driveline, then vibrations at both frequencies are attenuated, but installation difficulty and cost increase
Solution Approach 1:
The patent merges multiple damping functions into a single integrated damper assembly that can be installed as one unit. The housing contains multiple damping elements (viscoelastic materials and metal springs) arranged to provide broad-frequency vibration attenuation. This single-unit integration simplifies manufacturing, reduces assembly steps, and facilitates easier installation compared to mounting two separate dampers, while maintaining comprehensive vibration protection across multiple frequency ranges.
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 dual-tuned vibration damper effectively attenuates both high and low-frequency vibrations in the driveline, reducing the need for multiple dampers and minimizing the impact on vehicle mileage, while being cost-effective and easily integratable into the driveline.
Implementation Method 1
a first resilient coupling resiliently coupling the first mass to the hub, the second resilient coupling resiliently coupling the second mass directly to the first mass
Implementation Method 2
The first mass and the first resilient coupling are configured to attenuate vibration at a higher one of the first and second frequencies. The second mass and the second resilient coupling are configured to attenuate vibration at a lower one of the first and second frequencies.
Data Source
AI summary
A driveline with a shaft and a vibration damper coupled to the shaft. The damper includes a hub, a first mass, a first resilient coupling, a second mass, and a second resilient coupling. The first mass is disposed concentrically about the hub. The first resilient coupling resiliently couples the first mass to the hub. The first resilient coupling has a first spring constant. The second mass is disposed concentrically about the first mass. The second resilient coupling resiliently couples the second mass directly to the first mass. The second resilient coupling has a second spring constant that is less than the first spring constant. The first mass and the first resilient coupling are configured to attenuate vibration at a first frequency. The second mass and the second resilient coupling are configured to attenuate vibration at a second frequency. The second frequency is lower than the first frequency.