Roll Support Arrangement Vibration Damping
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Solution Overview
Problem
Current support arrangements for rolls in fibrous-web machines face challenges in effectively damping vibrations without compromising static rigidity, particularly in directions that require rigidity, leading to issues like weakened support and inaccurate settings in nip contacts and web reel interactions.
Innovation Solution
A support arrangement with a motion direction control mechanism that utilizes a thin, deformable support part fastened perpendicular to the direction of allowed elasticity, combined with a pivot system allowing rotational motion in specific directions, to isolate and control the direction of elastic motion, ensuring effective damping without compromising static rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the roll support is made elastic to damp vibrations, then vibration damping is improved, but static rigidity deteriorates causing inaccurate positioning
Solution Approach 1:
The support structure is segmented into multiple independent elastic support elements (such as elastic pieces, rubber elements, or spring mechanisms) distributed at different locations. Each element provides localized vibration damping while the collective arrangement maintains overall structural rigidity. This segmentation allows the system to damp vibrations effectively without sacrificing the static rigidity needed for accurate roll positioning.
Solution Approach 2:
Different parts of the support structure have different elastic properties tailored to their specific functions. Critical positioning areas use stiffer support elements to maintain accuracy, while areas prone to vibration use more compliant elements for damping. This local differentiation of support characteristics allows simultaneous achievement of vibration damping and positioning precision.
2Manufacturing precision
If the support is made more rigid to maintain positioning accuracy, then manufacturing precision is improved, but vibration damping deteriorates
Solution Approach 1:
The support system transitions from a purely static rigid structure to a dynamic system with controlled elastic properties. The elastic support elements are designed to provide stiffness at low frequencies (maintaining positioning accuracy) while allowing controlled deformation at vibration frequencies (damping vibrations). This dynamic characterization of the support structure resolves the contradiction between rigidity and vibration damping.
Solution Approach 2:
The elastic properties of the support elements are carefully selected and tuned to achieve optimal performance. By adjusting parameters such as material composition, geometry, and pre-load of elastic elements, the support system is optimized to provide adequate stiffness for positioning while maintaining vibration damping capabilities across the operating frequency range.
3Adaptability or versatility
If elastic intermediate pieces are used to adjust critical speed, then adaptability is improved, but static rigidity deteriorates in unwanted directions
Solution Approach 1:
The elastic support elements are arranged asymmetrically or with different stiffness characteristics in different directions. This asymmetric configuration allows the system to be compliant in directions where vibration damping is needed while maintaining rigidity in directions where positioning stability is critical. The asymmetric design enables independent control of support characteristics in different spatial directions.
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 solution provides effective vibration damping while maintaining the necessary static rigidity in critical directions, ensuring accurate positioning and operation of rolls in fibrous-web machines, particularly in high-speed applications.
Implementation Method 1
a first frame part (12) in which the roll (20) of the fibrous-web machine is supportable from its end and a second frame part (22) in which the first frame part (12) is fastened by means of an elastic fastening
Implementation Method 2
The support part (36) is thin in the direction of the direction control arrangement (34) and it is deformable in a direction perpendicular to its plane
Implementation Method 3
a pivot system allowing rotational motion in specific directions
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a support arrangement (10) of a roll of a fibrous-web machine, which comprises a first frame part (12) in which the roll (20) of the fibrous-web machine is supportable from its end when in use and a second frame part (22) in which the first frame part (12) is fastened by means of an elastic fastening. The arrangement comprises a motion direction control arrangement (34) for controlling the direction of the motion allowed by the elastic fastening in a way determined by the direction control arrangement (34).