Sound Generator Partition Wall Directs Noise for Compact Packaging
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Solution Overview
Problem
Conventional sound generators for acoustic vehicle alerting systems emit noise in unnecessary directions, making it difficult to position vehicle components close to the sound generator due to the need for space to allow sound propagation, and they struggle with airtightness inspections.
Innovation Solution
A sound generator design that includes a base with a partition wall and an erected wall to direct sound emission in one direction, using a diaphragm and a protection wall to create a sound emission space, and a method for manufacturing that involves ensuring a pressure difference to stabilize airtightness inspections without a jig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sound generator emits sound in all directions, then sound propagation is achieved, but noise propagates in unnecessary directions making it difficult to position vehicle components close to the sound generator
Solution Approach 1:
The base is divided into a first space and a second space by a partition wall, with the sound generating body positioned in the second space. This segmentation allows the sound generator to be positioned closer to vehicle components while controlling noise propagation through the partition wall structure.
Solution Approach 2:
The partition wall is configured with a sound emission portion that has different acoustic properties from other portions. The sound emission portion allows sound to pass through while other portions block noise propagation, creating localized acoustic functionality that enables closer component positioning.
2Reliability
If conventional sound generator is used, then sound generation is achieved, but airtightness inspection is difficult
Solution Approach 1:
The partition wall is pre-configured with a through-hole that allows insertion of an inspection tool during manufacturing. This preliminary structural preparation enables easy airtightness inspection by allowing pressure differential testing through the pre-formed access point.
3Volume of stationary object
If protection wall is positioned close to partition wall, then space is saved, but airtightness inspection becomes difficult
Solution Approach 1:
The inspection access is provided through the partition wall in a direction perpendicular to the main sound emission path. This dimensional approach allows inspection tools to access the airtightness test route without requiring additional space in the sound emission direction, maintaining compact internal space while enabling inspection.
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 sound generator effectively restricts noise propagation in unnecessary directions, allowing vehicle components to be positioned closer to the sound generator, and simplifies airtightness inspections by using a pressure difference to inflate the diaphragm during testing.
Implementation Method 1
a driving portion configured to vibrate the diaphragm when energized to generate the sound
Implementation Method 2
increasing a pressure in a first space to be higher than a pressure in a second space and to inflate the diaphragm toward the first space
Data Source
AI summary
A sound generator includes a sound generating body, a base, a protection wall, and an erected wall. The sound generating body includes a diaphragm and a driving portion. The base includes a base tubular portion and a partition wall defining a sound hole. The diaphragm and the partition wall divide an inner space of the base tubular portion into a first space and a second space. The protection wall is disposed away from the partition wall and the erected wall connects between the protection wall and the base tubular portion. The protection wall, the erected wall, and the partition wall defines a sound emission space in communication with the first space through the sound hole. The protection wall and the erected wall define an emission hole through which the sound exits.