Speed-Adaptive Tuned Mass Absorber for Large-Angle Torsional Damping
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Solution Overview
Problem
Speed-adaptive vibration absorbers in motor vehicles face inefficiencies due to increased oscillation angles, leading to deteriorated insulation effects and potential stops of absorber masses, especially in limited installation spaces and with internal combustion engines having three or fewer cylinders, causing resonance and vibration issues.
Innovation Solution
A speed-adaptive vibration absorber with a disk part rotating about an axis and absorber masses following an epicycloid pendulum track, where a second pendulum order is enforced, reducing the curvature of aerial tramways at large angles to maintain effective vibration isolation across the drive train's operating range, preventing absorber mass stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction devices are added to limit the oscillation angle of absorber masses, then the insulating effect is improved, but the capacity of the centrifugal pendulum is limited and installation space is consumed
Solution Approach 1:
The patent extracts the oscillation angle limitation function from separate friction devices and integrates it into the fundamental geometry of the aerial tramway itself. By designing the tramway path as a circular segment with specific curvature characteristics, the system inherently limits and optimizes oscillation angles without requiring additional friction-based constraint devices, thereby reducing overall device complexity and space requirements.
Solution Approach 2:
The patent merges multiple functions into the aerial tramway structure: it simultaneously serves as the support structure for absorber masses, defines the oscillation trajectory, provides the curvature-based oscillation angle limitation, and establishes the variable pendulum order characteristic. This consolidation eliminates the need for separate friction devices and simplifies the overall system design.
2Ease of manufacture
If absorber masses are arranged radially on the outside to accommodate friction devices, then friction devices can be installed, but installation space is reduced and the arrangement of absorber masses is compromised
Solution Approach 1:
The patent extracts the oscillation control function from separate friction devices and embeds it in the aerial tramway geometry itself. This eliminates the need for additional space-consuming friction devices and allows absorber masses to be optimally arranged radially on the outside of the rotating disk without space constraints from friction device installations.
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 solution ensures consistent vibration isolation across the drive train's operating range, avoiding resonance and mass stops, thereby reducing noise and stress on the vibration absorber, even at high oscillation angles, without requiring additional centrifugal masses or space-consuming components.
Implementation Method 1
absorber masses arranged on the circumference and oscillating along a first oscillation angle forced along an epicycloid first pendulum track, tuned to a predetermined first pendulum order
Implementation Method 2
centrifugal pendulums to calm a drive train subject to torsional vibrations
Implementation Method 3
speed-adaptive vibration absorber with a disk part rotating about an axis of rotation and several on this disk part arranged over the circumference oscillating
Implementation Method 4
a natural mode of the drive train is in an operating state of the vehicle, i.e. at a speed of the internal combustion engine above the idle speed. Corresponding resonances can occur on the speed-adaptive vibration damper
Data Source
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AI summary
The invention relates to a rotational speed-adaptive tuned mass absorber and a torsional vibration damper with the same, having a disc part rotating about an axis of rotation and a plurality of oscillating tuned masses arranged on said disc part around the circumference along a first oscillation angle enforced along an epicycloid first pendulum track tuned to a predefined first pendulum order. To implement stops to the tuned masses at large oscillation angles with adequate oscillation isolation at large oscillation angles, the tuned masses are guided at second oscillation angles exceeding the first oscillation angles onto a second pendulum track forcing a second pendulum order modified over the first pendulum order.