Torsional Pendulum Damper Tuning for Direct Engine Oscillations
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Solution Overview
Problem
Existing torsional oscillation damping devices in vehicle transmission systems are ineffective when directly exposed to high-intensity torsional oscillations from the engine, as they are not designed to handle unfiltered oscillations, leading to potential degradation and reduced filtering performance.
Innovation Solution
A torsional oscillation damping device with pendulum bodies tuned to an order value greater than the engine's excitation order, allowing it to effectively dampen torsional oscillations without oversizing, by adjusting parameters such as rolling track shape, inertia, and center of gravity distance, ensuring satisfactory filtering performance even when directly downstream of the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torsional oscillation damping device is placed directly downstream of the internal combustion engine without intervening damping means, then initial filtering of high-intensity torsional oscillations can be performed, but the pendulum bodies are subjected to very high-intensity torsional oscillations that they are not designed to handle
Solution Approach 1:
The patent changes the tuning parameter of the pendulum bodies from being tuned to the excitation order of the engine to being tuned to an order value greater than the excitation order (ratio > 1.1). This parameter change allows the damping device to handle high-intensity oscillations directly from the engine while maintaining filtering effectiveness, resolving the contradiction between reliability and harmful factors.
2Reliability
If the pendulum body is tuned to the excitation order of the internal combustion engine, then optimal filtering performance is achieved, but the device cannot withstand the high-intensity oscillations directly from the engine
Solution Approach 1:
The patent modifies the tuning order parameter from equal to excitation order to greater than excitation order (ratio > 1.1), which shifts the resonance frequency away from the engine's excitation frequency. This prevents resonant amplification of oscillations, allowing the device to withstand high-intensity vibrations while maintaining adequate filtering performance.
Solution Approach 2:
The patent designs the pendulum bodies with increased mass and adjusted geometry beforehand to handle the full intensity of engine oscillations. By pre-calculating and accommodating the maximum expected oscillation amplitudes in the design phase, the device can withstand high-intensity vibrations without requiring oversized components during operation.
3Strength
If the pendulum body is oversized to withstand high-intensity oscillations, then mechanical strength is improved, but the device becomes too large for installation in restricted spaces
Solution Approach 1:
By changing the tuning order to be greater than the excitation order, the patent reduces the required pendulum body mass and dimensions. The detuned configuration allows smaller amplitude oscillations for the same damping effect, enabling compact design that fits in restricted spaces while maintaining adequate strength to handle engine vibrations.
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 device achieves effective filtering of torsional oscillations with a slight degradation in performance, allowing it to withstand high-intensity oscillations directly from the engine, ensuring better mechanical strength and installation flexibility in restricted spaces within the transmission system.
Implementation Method 1
the pendulum body being configured and tuned to a chosen order value such that the ratio between this order value and the excitation order of the heat engine is greater than 1.1
Implementation Method 2
A torsional oscillation damping device with pendulum bodies tuned to an order value greater than the engine's excitation order, allowing it to effectively dampen torsional oscillations
Implementation Method 3
The displacement of the pendulum bodies relative to the support is guided by rolling elements that cooperate, on one side, with raceways fixed to the support, and on the other side, with raceways fixed to the pendulum bodies
Data Source
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AI summary
The invention relates to a component for a vehicle transmission system, comprising: an element (18) suitable for securing to the crankshaft of a heat engine of the vehicle; and a device (30) for damping torsional oscillations, comprising a carrier (31) secured to the element (18), and at least one pendulum body (32) which moves in relation to the carrier (31), the pendulum body (32) being designed so as to be linked to a command value selected in such a way that the ratio of said command value to the order of excitation of the heat engine is higher than 1.1.