Rotatable Machining Bar Assembly With Multi-Mode Vibration Damping
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Solution Overview
Problem
Existing rotatable assemblies, such as machining tools, face challenges in effectively damping vibrations across multiple modes, leading to reduced tool life and performance due to the limitations of traditional tuned mass dampers, which often require complex tuning and maintenance, are costly, and fail to efficiently manage vibrations beyond the first mode.
Innovation Solution
A rotatable assembly featuring a damping structure with a plurality of spring elements, where the spring elements are arranged in a lamellate configuration with varying extensions and materials having frequency-dependent elastic moduli, allowing for self-tuning and efficient damping across multiple vibration modes by adjusting stiffness and resonant frequency to match the assembly's vibration frequencies, and utilizing a coolant supply for temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tuned mass dampers are used, then vibrations in the first mode can be damped, but vibrations in second and higher modes are not effectively damped
Solution Approach 1:
The damping structure is segmented into multiple independent spring elements (first, second, third spring elements) with different stiffness values. Each spring element is tuned to damp a specific vibration mode of the rotatable assembly, allowing simultaneous damping of multiple modes including first mode, second mode, and higher modes through the segmented spring element arrangement.
2Reliability
If complex tuning mechanisms are added to achieve multi-mode damping, then damping performance improves, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention changes the stiffness parameter of spring elements to achieve different damping effects. By selecting spring elements with specifically designed stiffness values (different stiffness values for different spring elements), the system achieves multi-mode damping without complex tuning mechanisms. The stiffness parameter variation alone enables the damping structure to effectively damp multiple vibration modes.
Solution Approach 2:
The damping structure is designed to be self-tuning through the inherent properties of the spring elements. The spring elements with different stiffness values automatically damp different vibration modes based on their natural frequencies, eliminating the need for external tuning mechanisms or adjustments. The system self-regulates to provide optimal damping across multiple modes.
3Reliability
If multiple damping masses are added to damp higher modes, then damping effectiveness improves, but device complexity and cost increase
Solution Approach 1:
The invention applies local quality by making each spring element have a different stiffness value tailored to specific vibration modes. Instead of adding multiple damping masses, the local variation in spring element stiffness (first spring element with first stiffness, second spring element with second stiffness, etc.) creates targeted damping zones for different vibration modes, achieving multi-mode damping with a single integrated structure.
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 provides reliable, long-lasting, and cost-effective vibrational damping across multiple vibration modes, reducing maintenance needs and improving tool life by automatically adjusting resonant frequencies and stiffness to match the assembly's vibration frequencies, while also using a coolant for temperature control to optimize damping performance.
Implementation Method 1
a damping structure arranged to support the damping mass relative to the main body and arranged to damp vibrational movements of the damping mass relative to the main body in the radial directions; wherein the damping structure comprises a plurality of spring elements
Implementation Method 2
damp vibrational movements of the damping mass relative to the main body in the radial directions
Implementation Method 3
a coolant supply structure
Implementation Method 4
utilizing a coolant supply for temperature control
Data Source
AI summary
Rotatable assembly (10) having one end (12) adapted to be secured to a rotatable support for rotating the rotatable assembly (10) about a rotational axis (28), the rotatable assembly (10) comprising: a main body (18) having a cavity (56); a damping mass (38) arranged within the cavity (56) and movable in radial directions (30), substantially perpendicular to the rotational axis (28), relative to the main body (18); a damping structure (36) arranged to support the damping mass (38) relative to the main body (18) and arranged to damp vibrational movements of the damping mass (38) relative to the main body (18) in the radial directions (30); wherein the damping structure (36) comprises a plurality of spring elements (40); and wherein each spring element (40) has a flat appearance.