Pendulum Flyweight Damping System Harmonic Filtering
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Solution Overview
Problem
Existing vibration damping systems of the pendulum oscillator type in motor vehicle transmissions fail to effectively filter higher-order harmonics without amplifying them, leading to undesirable vibrations and noise, especially at certain engine speeds.
Innovation Solution
A vibration damping system with a support member having a specific moment of inertia, allowing the pendulum flyweights to be tuned such that their second resonance order is different from the tuning order, preventing amplification of higher-order harmonics and maintaining system performance across a range of engine speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pendulum flyweights are tuned to filter vibrations at a principal order, then the preponderant harmonics are strongly damped, but higher-order harmonics are amplified
Solution Approach 1:
The patent modifies the moment of inertia parameter of the support member to shift the second resonance order of the pendulum flyweight away from harmful harmonic orders. By changing this physical parameter, the system achieves effective damping of principal harmonics while avoiding amplification of higher-order harmonics, thus resolving the technical contradiction between damping effectiveness and harmful harmonic amplification.
2Object-generated harmful factors
If the moment of inertia of the support is configured to prevent second resonance order matching with tuning order, then higher-order harmonics are not amplified, but the system complexity increases
Solution Approach 1:
Instead of adding complex control systems or multiple components, the patent resolves the contradiction by optimizing a single physical parameter - the moment of inertia of the support member. This parameter change enables the system to prevent harmful harmonic amplification through proper tuning of the pendulum flyweight's resonance characteristics, achieving the desired effect without increasing device complexity.
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 system effectively filters vibrations at the principal order without amplifying higher-order harmonics, improving damping effectiveness and reducing noise and vibrations within the specified engine speed range.
Implementation Method 1
the pendulum flyweight being tuned to a tuning order n, the pendulum flyweight having a first resonance order of an order lower than the tuning order n, and a second resonance order higher than the tuning order n
Implementation Method 2
a support member able to be rotationally driven around an axis X, having a moment of inertia I
Data Source
AI summary
A vibration damping system for a transmission system, exhibiting a stiffness K, of a motor vehicle having a combustion engine, having a support member able to be rotationally driven around an axis X, having a moment of inertia I; and a pendulum flyweight mounted movably on the support member, the pendulum flyweight being tuned to a tuning order n, the pendulum flyweight having a first resonance order of an order lower than the tuning order n, and a second resonance order higher than the tuning order n; the moment of inertia I of the support being configured for any engine speed value within an engine speed range of the combustion engine from 600 to 5000/n revolutions per minute, and for a given stiffness K of the transmission system, the second resonance order of the pendulum flyweight is different from an order y*n, where y is an integer.