Generator Set Casing with Thick Sound-Absorbing Panels
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Solution Overview
Problem
Generator sets have high noise levels due to inadequate acoustic insulation, particularly because the slots in the casing for air intake and cooling are not covered with sound-absorbing material, which impairs sound insulation.
Innovation Solution
The generator set features a casing internally covered with sound-absorbing panels of thickness 6 cm or more and includes partitions made of sound-absorbing material disposed in parallel adjacent positions near air slots to reduce external noise, optimizing air flow and acoustic insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the casing is provided with slots for air intake and cooling, then the engine operation is guaranteed, but the acoustic insulation is impaired
Solution Approach 1:
The patent applies local quality by making different parts of the casing have different properties: the main casing walls are solid for acoustic insulation, while specific localized areas have slots for air intake. The sound-absorbing panels are then applied specifically around these slots to address the acoustic issue locally without compromising the air intake function.
Solution Approach 2:
The sound-absorbing panels act as an intermediary element between the slots (which are necessary for engine operation) and the external environment (where noise is generated). These panels allow air to pass through while absorbing sound waves, thus mediating between the conflicting requirements of air flow and acoustic insulation.
2Object-affected harmful factors
If the casing is fully covered with sound-absorbing panels, then the acoustic insulation is improved, but the air flow from exterior to interior is restricted
Solution Approach 1:
Instead of uniformly covering the entire casing, the sound-absorbing panels are applied locally around the slots and in areas where acoustic insulation is most needed. This localized approach maintains acoustic benefits while preserving adequate air flow paths to the engine.
Solution Approach 2:
The sound-absorbing panels are made of porous or permeable material that allows air to pass through while absorbing sound. This enables the panels to provide acoustic insulation without completely blocking the air flow necessary for engine operation and cooling.
3Ease of manufacture
If thin sound-absorbing panels are used, then the manufacturing cost is reduced, but the acoustic impact remains high
Solution Approach 1:
The patent specifies a minimum thickness parameter for the sound-absorbing panels (at least 5 cm) to achieve the required acoustic performance. This parameter change from thin to thick panels significantly reduces the acoustic impact from 74 dB to 56 dB at 7 meters, while still being manufacturable and installable.
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 significantly reduces noise emissions, achieving a sound impact of 56 dB at 7 meters, allowing the generator set to meet strict acoustic pollution standards for both industrial and residential areas.
Implementation Method 1
an internal covering obtained with sound-absorbing panels having a thickness that is equal to or higher than 6 cm
Data Source
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AI summary
A generator set (100; 200) comprises a casing (1) that comprises a bottom wall (13) and at least one lateral wall (10, 11) that define a compartment (V) that houses an internal combustion engine and an alternator; said casing (1) comprising slots (2) obtained in said at least one lateral wall (10, 11) to put the compartment (V) of the casing in communication with the exterior; said bottom wall (13) and said at least one lateral wall (10, 11) of the casing comprising an internal surface directed towards the compartment (V) of the casing (1) and covered with sound-absorbing panels with thickness higher than or equal to 6 cm.