Soundproof Wheel With Dynamic Vibration Absorbers
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Solution Overview
Problem
Existing soundproof wheels for railway vehicles fail to effectively reduce wheel vibration noise and are not durable, as the soundproofing devices can detach during high-speed travel and cause wear on the wheel components.
Innovation Solution
A soundproof wheel design featuring a fixing ring attached to the rim section with an elastic body and additional mass sections disposed in a groove, where the elastic body and additional mass pieces are adhered to the fixing ring, and multiple dynamic vibration absorbers with different resonance frequencies are used to concurrently reduce noise across multiple natural frequencies, ensuring the components remain securely attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a soundproofing device is attached to the inner peripheral surface of the rim section to reduce wheel vibration noise, then noise reduction effect is improved, but the soundproofing device may detach during high-speed travel, reducing reliability
Solution Approach 1:
The soundproofing device is divided into multiple independent dynamic vibration absorbers arranged along the circumferential direction. Each absorber consists of an elastic body and additional mass, creating segmented structures that independently function to reduce vibrations at different frequencies while being separately secured to the rim section
Solution Approach 2:
The elastic bodies are pre-mounted to the rim section before the additional masses are attached. This preliminary action ensures that the mounting structure is already in place and properly secured to the wheel, preventing detachment during high-speed travel while maintaining the noise reduction function
2Object-generated harmful factors
If multiple dynamic vibration absorbers with different resonance frequencies are used to reduce noise at multiple natural frequencies, then noise reduction effectiveness is improved, but device complexity increases
Solution Approach 1:
The soundproofing device is segmented into multiple dynamic vibration absorbers, each with different resonance frequencies tailored to target specific natural frequencies of the wheel. This segmentation allows concurrent reduction of noise at multiple frequency levels while maintaining a relatively simple overall structure that follows the circumferential direction of the wheel
Solution Approach 2:
Each dynamic vibration absorber is designed with local quality - specific elastic body dimensions and additional mass values - to achieve different resonance frequencies. This allows each segment to be optimized for a particular frequency range, enabling multi-frequency noise reduction through a systematic arrangement of varied but standardized components
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 design significantly reduces wheel vibration noise across multiple frequency levels and enhances durability by preventing the soundproofing device from detaching and minimizing wear on wheel components.
Implementation Method 1
an elastic body section which is adhered to an outer peripheral surface of the fixing ring
Implementation Method 2
A dynamic vibration absorber has a resonance frequency, which coincides with a natural frequency of a structure, and can absorb (reduce) the vibration of the structure through resonance
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
This soundproof wheel includes a soundproofing device (3) which is mounted to an inner peripheral surface (6) of a rim section (5) of the wheel. The soundproofing device (3) is provided with: a fixing ring (10) which is fitted in and fixed to a groove (8) formed in the inner peripheral surface (6) of the rim section (5); an elastic body section (11) which is adhered to an outer peripheral surface (10a) of the fixing ring (10), is disposed within the groove (8), and has a plurality of elastic body pieces; and an additional mass section (12) which is adhered to an opposite side of the elastic body section (11) with respect to the fixing ring (10), is disposed within the groove (8), and has a plurality of additional mass pieces. The soundproofing device (3) includes a plurality of dynamic vibration absorbers. Each of the dynamic vibration absorbers has an elastic body piece and an additional mass piece. This soundproof wheel allows for reduction in wheel vibration noise and is highly durable.