Centrifugal Pendulum Vibration Isolation for Multi-Resonance Drive Units
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Solution Overview
Problem
Conventional centrifugal pendulum devices are only partially effective in isolating vibrations from drive units, particularly in limited resonance ranges, and require additional damping devices.
Innovation Solution
A centrifugal pendulum device with multiple pendulum elements, each designed for specific resonance ranges, utilizing centrifugal force to counteract vibrations, and integrated with a flywheel and friction clutch for efficient vibration isolation without external damping elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single pendulum element is used in a centrifugal pendulum device, then the device can counteract vibrations in one specific resonance range, but it is only effective for limited states of the drive unit and cannot provide broad vibration isolation
Solution Approach 1:
The centrifugal pendulum device is segmented into multiple pendulum elements, each designed with different masses and suspension characteristics to target specific resonance ranges. This segmentation allows the device to address multiple vibration frequencies simultaneously, expanding its effectiveness across different drive unit states without requiring a single complex adjustable mechanism.
Solution Approach 2:
Each pendulum element is given local quality through差异化 design of masses, suspension lengths, and attachment positions. This allows each element to optimally counteract vibrations in its specific resonance range, with the first pendulum element targeting lower frequencies and the second element targeting higher frequencies, thereby providing comprehensive vibration isolation across the full operational spectrum.
2Adaptability or versatility
If multiple pendulum elements with different resonance ranges are added to expand vibration isolation coverage, then broader frequency range coverage is achieved, but the device complexity and construction size increase
Solution Approach 1:
The pendulum elements are nested on the same rotating element, with multiple elements mounted in a compact arrangement around the rotation axis. This nesting approach allows multiple pendulum elements with different resonance characteristics to occupy minimal space, achieving broad frequency coverage without proportionally increasing the device's overall volume.
Solution Approach 2:
The rotating element serves as a universal mounting platform for multiple pendulum elements, each contributing to different aspects of vibration isolation. This multi-functional design allows a single structural component to support multiple functional elements, reducing the need for separate mounting structures and minimizing overall device size.
3Adaptability or versatility
If conventional centrifugal pendulum devices are used, then they can provide vibration isolation in a specific resonance range, but additional damping devices are required to achieve effective isolation across multiple resonance ranges
Solution Approach 1:
The vibration isolation functionality across multiple resonance ranges is merged into a single centrifugal pendulum device by integrating multiple pendulum elements with different masses and suspension characteristics. This combination eliminates the need for separate damping devices, as the multi-element pendulum system inherently provides broad-spectrum vibration isolation through the complementary resonance ranges of its individual elements.
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
Achieves effective vibration isolation across multiple resonance ranges, reducing the need for external damping devices and optimizing space usage, while maintaining efficiency and reducing construction size.
Implementation Method 1
the centrifugal force is used to accelerate a vibrating suspended mass, in order to thereby produce a counter-vibration to an input vibration
Implementation Method 2
They can vibrate in a predetermined resonance range as a result of centrifugal force. When a vibration in the resonance range of the pendulum elements is superimposed on the rotational motion, the pendulum elements are set into vibration in such a way that the superimposed vibration is (almost) canceled out
Data Source
AI summary
A centrifugal pendulum device for vibration isolation of a power take-off system of a drive unit, having a first pendulum element with a first mass and a second pendulum element with a second mass, which are set up to counteract vibrations of the drive unit in a resonance range. The first pendulum element has a first resonance range and the second pendulum element has a second resonance range, where the first and the second resonance ranges differ. Using the centrifugal pendulum device it is possible in a small construction space using efficient means to isolate an extended frequency range of vibrations from the drivetrain. In particular, with drive units which are designed as internal combustion engines having activatable cylinders, it is possible, using the centrifugal pendulum device proposed here to achieve a vibration isolation for many states of the drive unit.