Vehicle Dash Panel Sound Insulation with Localized Density
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Solution Overview
Problem
Existing vehicle sound insulation systems have excessive sound insulation quality on the front passenger seat side, which is not required, leading to inefficiencies and increased complexity in noise suppression and assembly, as they are configured similarly to the driving seat side despite differing noise leakage requirements.
Innovation Solution
A vehicle sound insulation system with a dash panel and instrument panel configuration that includes a driving seat side sound insulating section with an elastically deformable material and high-density material, and a front passenger seat side sound insulating section with fewer sound absorbing materials, optimized to suppress noise leakage while minimizing material usage and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulator dash has similar configurations on the driving seat side and the front passenger seat side, then sound insulation performance is uniformly high, but excessive quality is produced on the front passenger seat side where high sound insulation is not required
Solution Approach 1:
The insulator dash is divided into a driving seat side insulator section and a front passenger seat side insulator section with different configurations. The driving seat side uses multiple layers including sound absorbing material and sound insulating material to achieve high sound insulation performance, while the front passenger seat side uses fewer layers since high sound insulation is not required there. This local differentiation eliminates excessive quality on the front passenger side while maintaining necessary performance on the driving side.
2Reliability
If high density material is added to the driving seat side sound insulating section, then sound insulation performance is improved, but device complexity and material usage increase
Solution Approach 1:
The high density sound insulating material is selectively placed only in the driving seat side insulator section where high sound insulation performance is required due to the opening section. The front passenger seat side insulator section uses a simpler configuration without this additional material. This localized application improves sound insulation where needed while avoiding unnecessary complexity and material usage elsewhere.
3Reliability
If multiple sheets of sound absorbing materials are arranged in the plate thickness direction, then sound insulation performance is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
Multiple sheets of sound absorbing materials are arranged in the plate thickness direction specifically in the driving seat side insulator section to achieve high sound insulation performance. In contrast, the front passenger seat side insulator section uses fewer sheets since high sound insulation is not required there. This differentiated approach maintains necessary performance while reducing assembly complexity and manufacturing cost overall.
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 system effectively suppresses noise from the power unit room into the vehicle interior by varying sound insulation performance between the driving seat and front passenger seat sides, reducing excessive material usage and simplifying assembly, while maintaining adequate noise absorption across a wide frequency range.
Implementation Method 1
a driving seat side sound absorbing material that is arranged along a portion on the driving seat side of the dash panel and is made of an elastically deformable material
Implementation Method 2
a high density material that is arranged along and closely attached to a surface on the vehicle rear side of the driving seat side sound absorbing material and is made of a material that has a higher density than the material of the driving seat side sound absorbing material
Implementation Method 3
configured with one or more sound absorbing materials that are arranged along a portion on a front passenger seat side of the dash panel
Data Source
AI summary
A vehicle is provided that includes a dash panel that partitions a power unit room, arranged on a vehicle front side and a vehicle interior from each other, an instrument panel that covers the dash panel from a vehicle rear side and at a portion of which, on a driving seat side and a vehicle lower side an opening section through which an arm section of a pedal is insertable is formed, and a sound insulating section that is installed along a surface on the vehicle rear side of the dash panel, in which the sound insulating section includes a driving seat side sound insulating section that is configured including a driving seat side sound absorbing material that is arranged along a portion on the driving seat side of the dash panel and is made of an elastically deformable material and a high density material that is arranged along and closely attached to a surface on the vehicle rear side of the driving seat side sound absorbing material and is made of a material that has a higher density than the material of the driving seat side sound absorbing material, and a front passenger seat side sound insulating section that is configured with one or more sound absorbing materials that are arranged along a portion on a front passenger seat side of the dash panel, in which a number of sheets of the sound absorbing materials arranged in a plate thickness direction of the dash panel is set at a number less than or equal to a number of sheets of sound absorbing materials included in the driving seat side sound insulating section.