Blowing Machine Modifier for Resonance Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Production machines with rotating work wheels, such as blow molding machines, experience significant vibrations due to natural frequency resonance, leading to high amplitude oscillations that conventional damping methods fail to adequately mitigate.
Innovation Solution
A modifier with variable dynamic properties is positioned on the work wheel to alter its natural vibration characteristic, shifting the frequency outside the excitation range or generating phase-shifted vibrations to reduce amplitude, thereby avoiding resonance vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional damping methods are used to reduce vibrations, then vibration amplitude is reduced to some extent, but the damping elements are subject to strong mechanical loads and cannot sufficiently calm the overall system
Solution Approach 1:
The patent changes the natural frequency parameter of the working wheel system by adding a modifier with specific mass and elastic mounting, shifting the resonance frequency away from the excitation frequency range. This prevents the system from entering resonant states where conventional damping would be overwhelmed, fundamentally changing the dynamic characteristics rather than merely dampening the vibrations.
Solution Approach 2:
The modifier acts as an intermediary element with variable dynamic properties that mediates between the excitation forces and the working wheel system. By positioning this modifier with adjustable mass and elasticity on the working wheel, it absorbs and transforms vibrational energy, reducing the mechanical loads on conventional damping elements while maintaining overall system stability.
2Productivity
If the working wheel operates at high speed to increase productivity, then production output increases, but excitation vibrations occur that can match the natural frequency causing large amplitude oscillations
Solution Approach 1:
The patent introduces a modifier with variable dynamic properties that can be adjusted during operation. This allows the natural frequency of the working wheel system to be dynamically changed to avoid resonance with excitation frequencies that occur at different operating speeds. The variable mass and elastic mounting enable the system to adapt its vibrational characteristics as speed changes, maintaining stability across the full productivity range.
3Object-affected harmful factors
If damping elements are added to reduce vibrations, then vibration amplitude is reduced, but the device complexity increases and the damping elements themselves are subjected to strong mechanical loads
Solution Approach 1:
Rather than adding more damping elements, the patent changes the fundamental parameter of the system's natural frequency by introducing a modifier with specific mass and elastic mounting characteristics. This shifts the resonance frequency away from operating excitation frequencies, reducing vibrations through parameter modification rather than through additional damping components, thereby avoiding increased device complexity.
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 effectively minimizes vibrations, resulting in quieter operation and reduced mechanical stress, even when operating at varying speeds and production processes, by changing the natural frequency or introducing compensation vibrations.
Implementation Method 1
a natural vibration characteristic of the working wheel provided with the processing stations is modified in such a way that the modified natural vibration characteristic is specified differently from a resonance vibration characteristic at an excitation frequency acting on the working wheel
Implementation Method 2
generating phase-shifted vibrations to reduce amplitude, thereby avoiding resonance vibrations
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The production machine has a rotating operating wheel and a plurality of operating units arranged on the operating wheel. Arranged in the region of the operating wheel there is at least one modifier for altering an intrinsic oscillation characteristic of the operating wheel which has the operating units. The oscillation dynamics of the modifier are such that the modified intrinsic oscillation characteristic differs from a resonance characteristic at a prescribed excitation frequency. The design of the production machine is more particularly that of a blowing machine which has a blower wheel with a plurality of blower units arranged thereon.