Forklift Frame Resonator Layout for Intake Noise Reduction
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Solution Overview
Problem
Forklifts face challenges in noise reduction due to insufficient space for large intake resonators and the proximity of the intake port to the driver's seat, leading to uncomfortable noise levels.
Innovation Solution
A forklift noise reduction device utilizing a cavity within the frame connected by a tube to the intake pipe, with a calculated length to match the resonance frequency, and incorporating a sound absorbing member and case to reduce noise, along with an intake port positioned away from the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large volume resonator is installed to reduce noise at low target frequency, then noise reduction effectiveness is improved, but available space in the engine room is insufficient
Solution Approach 1:
The patent relocates the resonator from the traditional engine room space to the frame structure of the forklift, utilizing three-dimensional space in a different location. This dimensional relocation allows the resonator to be positioned in the frame's hollow sections rather than competing for engine room space, thereby resolving the contradiction between noise reduction effectiveness and available installation space
Solution Approach 2:
The resonator is nested within the hollow frame structure of the forklift, utilizing the existing frame's internal space. By integrating the resonator into the frame's hollow sections, the design embeds the noise reduction component within the structural framework, maximizing space utilization without requiring additional engine room volume
2Ease of manufacture
If the intake port is positioned close to the driver's seat for structural reasons, then ease of installation is improved, but noise transmission to the driver increases
Solution Approach 1:
The patent introduces the resonator as an intermediary component between the intake port and the driver's seat. This resonator absorbs and dampens noise generated by the intake port before the sound waves can propagate to the driver, thereby reducing noise transmission while allowing the intake port to remain in its structurally convenient position
Solution Approach 2:
The patent extracts the noise reduction function from the intake port assembly itself and separates it into a distinct resonator component. By taking out the noise generation source's direct path to the driver and inserting a dedicated noise treatment component, the design reduces noise transmission while maintaining the intake port's original installation position
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
Effectively reduces intake noise by utilizing Helmholtz resonance theory, minimizing noise transmission to the driver through strategic placement of the intake port and use of sound absorbing materials.
Implementation Method 1
a length of the connecting tube is calculated from a volume of the cavity that to derive the same resonance frequency as a noise frequency of the forklift
Implementation Method 2
a sound absorbing member provided on one side of the cavity
Data Source
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AI summary
Disclosed are a forklift noise reduction device and a method of reducing noise. The forklift noise reduction device according to the present embodiment includes a cavity provided inside a frame of a forklift and a connecting tube of which one end communicates with an intake pipe of an engine and the other end communicates with the cavity, wherein a length of the connecting tube may be calculated from a volume of the cavity that to derive the same resonance frequency as a noise frequency of the forklift.