Cabin Bracket Segmentation for Noise Resonance

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Solution Overview

Problem

Conventional vehicles with cabins face difficulties in preventing noise resonance due to uniform high rigidity in cabin brackets, making it challenging to match the resonance frequency of air inside the cabin with the oscillation frequency of vibrations transmitted via vibration isolation members.

Innovation Solution

A vehicle cabin configuration with a cabin bracket having a higher rigidity portion and a lower rigidity portion, along with a vibration suppressing weight at the lateral outward end, allows for adjustable vibration characteristics, ensuring the oscillation frequency of vibrations transmitted to the cabin is kept low, thereby preventing noise resonance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a damping mass or weight for vibration isolation is provided in a conventional vehicle, then the resonance frequency of air inside the cabin can be prevented from matching the oscillation frequency of vibrations, but the characteristic frequency of the cabin bracket remains uniformly high and cannot be effectively adjusted

Engineering Contradiction:

Improvevibration isolation effectivenessVSAvoidadjustability of characteristic frequency

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The cabin bracket is divided into multiple segments with different rigidity characteristics: a fixed member, a higher rigidity portion, and a lower rigidity portion. This segmentation allows different parts of the bracket to have different characteristic frequencies, enabling effective vibration isolation without requiring the entire bracket to have uniformly low rigidity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the cabin bracket are given different rigidity properties locally. The higher rigidity portion maintains structural strength where needed, while the lower rigidity portion provides flexibility and lower characteristic frequency for vibration isolation. This local differentiation allows the bracket to achieve both strength and vibration isolation effectiveness.

Inventive Principle:

Principle #3Local quality

2Strength

If the cabin bracket is configured with uniform high rigidity from fixed member to distal end, then the structural strength is maintained, but the characteristic frequency remains uniformly high making it difficult to prevent resonance with cabin air

Engineering Contradiction:

Improvecabin bracket strengthVSAvoidnoise resonance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The cabin bracket is segmented into regions of different rigidity: a higher rigidity portion for maintaining structural strength and a lower rigidity portion for reducing characteristic frequency. This segmentation allows the bracket to simultaneously achieve both high strength and low characteristic frequency, preventing resonance with cabin air while maintaining structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different local portions of the bracket have different rigidity properties tailored to their specific functions. The higher rigidity portion provides structural support where loads are highest, while the lower rigidity portion provides flexibility and lower natural frequency for vibration isolation, thus preventing noise resonance while maintaining overall bracket strength.

Inventive Principle:

Principle #3Local quality

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 configuration effectively reduces noise resonance by adjusting the characteristic frequency of the cabin bracket, ensuring the resonance frequency of air inside the cabin does not match the oscillation frequency of vibrations, thereby improving the driving environment by minimizing cacophony.

Implementation Method 1

an elastic member disposed between said cabin bracket and said cabin

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a vibration suppressing weight disposed at a lateral outward end portion of said cabin bracket

Methodology Applied

Scientific EffectInertia: Inertia

Data Source

PatentUS7677627B2Vehicle with cabin

Publication Date: 2010.03.16 KUBOTA CORP

AI summary

A vehicle with a cabin comprising:a vehicle body supported by a plurality of wheels;a cabin bracket supported by the vehicle body; andan elastic member disposed between the cabin bracket and the cabin, whereinthe cabin bracket comprises:a fixed member fixed to the vehicle body,a higher rigidity portion extended to the outward side of the body from the fixed member, anda lower rigidity portion that is extended to the outward side from the end portion of the outward side of the higher rigidity portion, and that is lower in rigidity in the vertical direction than the higher rigidity portion; anda vibration suppressing weight disposed at the end portion in the outward direction of the cabin bracket.