Centrifugal Pendulum Variable Radius Path Design
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Solution Overview
Problem
Existing centrifugal pendulum systems face challenges in reducing impact noises due to the limited installation space and the use of additional components like elastomer elements, which have limited service life and increase costs.
Innovation Solution
The design modifies the pendulum mass paths to change the oscillation angle and reduce the pendulum radius, allowing the center of mass to be lifted against gravity, thereby reducing kinetic energy and minimizing impact noises without additional components, and optionally extending the swing angle to ±150° to prevent impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If stops are used to limit the oscillation angle of pendulum masses, then installation space is reduced, but impact noises increase and service life decreases
Solution Approach 1:
The patent applies dynamics by making the pendulum radius variable instead of fixed. The pendulum mass follows a path where the radius changes during oscillation, allowing the system to adapt its characteristics dynamically. This dynamic behavior enables the pendulum to reduce impact velocities without requiring physical stops, thereby reducing impact noises while maintaining compact installation space.
Solution Approach 2:
The patent changes the geometric parameter of the pendulum radius along the oscillation path. By designing a path where the radius varies (reducing) as the pendulum approaches the impact position, the system modifies its kinetic energy characteristics. This parameter change allows reduction of impact energy without additional damping components, solving the contradiction between compact space and impact noise reduction.
2Object-affected harmful factors
If elastomer elements are used to dampen impact noises, then impact noises are reduced, but service life decreases and costs increase
Solution Approach 1:
The patent extracts the need for elastomer damping elements by addressing the root cause of impact noises through geometric path design. Instead of adding damping components to mitigate impacts, the invention removes the necessity for such components by designing a pendulum path that inherently reduces impact velocities through variable radius geometry.
Solution Approach 2:
The patent converts the potentially harmful effect of gravity-caused impacts into a beneficial reduction of impact energy. By designing the pendulum path with reducing radius, the system uses the oscillation geometry itself to reduce impact velocities, transforming what would be a harmful impact scenario into a controlled, low-impact motion pattern.
3Object-affected harmful factors
If pendulum radius is reduced to minimize impact energy, then impact noises are reduced, but oscillation angle increases
Solution Approach 1:
The patent applies dynamics by making the pendulum radius variable instead of fixed. The pendulum mass follows a path where the radius changes during oscillation, allowing the system to adapt its characteristics dynamically. This dynamic behavior enables the pendulum to reduce impact velocities without requiring physical stops, thereby reducing impact noises while maintaining compact installation space.
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
This approach reduces impact noises by controlling the pendulum mass movement to minimize energy at impact, avoiding the need for elastomer elements and maintaining the absorber effect, while providing greater freedom of movement within the installation space.
Implementation Method 1
Due to the centrifugal force of the rotating pendulum flange, these pendulum masses are accelerated radially outwards and, in the field of centrifugal acceleration, oscillate on predetermined paths if they are excited by speed irregularities.
Implementation Method 2
under the influence of gravity at low speeds of the pendulum flange, the pendulum masses temporarily located above the axis of rotation of the pendulum flange fall from a radially outer track caused by centrifugal force inwards against a stop
Data Source
Figure 1~2
Figure 3~6
Figure 4~5
AI summary
The invention relates to a centrifugal force pendulum (1, 1a) having a pendulum flange (3, 3a) which is arranged so as to be rotatable about an axis of rotation (2) and having a plurality of pendulum masses (4, 4a) which, for rotational-speed-adaptive absorption of rotary oscillations introduced into the pendulum flange (3, 3a), are held so as to be pitovable with a centre of mass (M) about at least one pendulum point (P) with a predefined pendulum radius (r) and a predefined swing angle (a). In order, at low rotational speeds of the pendulum flange (3, 3a), to reduce a generation of noise caused by pendulum masses arranged with the centre of masses thereof above the axis of rotation being accelerated in the direction of the axis of rotation owing to gravitational force, the predefined swing angle (a) is changed by a pendulum angle (ß) with a pendulum radius (rp) which is reduced in relation to the pendulum radius (r).