Blowing Duct Windows for Chassis Dynamometer Air Leakage
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Solution Overview
Problem
In chassis dynamometer vehicle running tests, vehicle restraint members like chains and belts interfere with blowing ducts, causing air leakage and uneven wind speed distribution due to the inability to position the discharge port close to the vehicle front surface, leading to inaccuracies in testing.
Innovation Solution
A blowing duct design featuring vertically elongated windows with adjustable inner and outer plates, elastic sheet members with slits, and cover plates that allow for precise alignment and vibration accommodation of vehicle restraint members, minimizing air leakage while enabling easy height adjustments for different vehicle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge port for cooling air is arranged at a position relatively close to the front surface of the vehicle, then the cooling air supply stability is improved, but the vehicle restraint members interfere with the blowing duct
Solution Approach 1:
The side wall of the blowing duct is divided into multiple sections by vertically arranged plate attachment parts, allowing the duct to be segmented and reconfigured. This segmentation enables the duct structure to adapt to different vehicle restraint member positions while maintaining the discharge port close to the vehicle front surface, thus improving cooling air supply stability without excessive structural complexity.
Solution Approach 2:
The blowing duct is designed with adjustable plates that can be detached and repositioned at different heights along the side walls. This dynamic adjustment capability allows the duct to adapt to different vehicle types and restraint member positions, resolving the conflict between maintaining close proximity to the vehicle front surface and avoiding interference with restraint members.
2Adaptability or versatility
If the size in the vertical direction of the slits is made large to accommodate vehicle restraint members, then the adaptability to different vehicle types is improved, but air leakage through the gaps increases
Solution Approach 1:
An elastic sheet member is installed within the slit opening of the blowing duct side wall. This flexible elastic sheet can deform to accommodate vehicle restraint members of different sizes and positions while maintaining a tight seal around them, preventing air leakage. The elasticity allows the sheet to conform to various restraint member configurations without requiring large fixed slit dimensions.
Solution Approach 2:
The opening size of the elastic sheet member is designed to be larger than the restraint member dimensions, and the elastic properties of the sheet allow it to dynamically adjust its effective opening size based on the restraint member inserted, thus accommodating different vehicle types while minimizing air leakage gaps.
3Loss of energy
If multiple plates are attached to close the unused slits, then the air leakage is reduced, but the ease of operation for adjusting to different vehicle types decreases
Solution Approach 1:
The plates are designed to be detachably attached to the blowing duct side walls at multiple predetermined positions. This dynamic attachment system allows operators to easily reconfigure the plate positions or remove them entirely when changing vehicle types, maintaining air leakage prevention while significantly improving ease of operation compared to fixed sealing structures.
Solution Approach 2:
The side wall closing mechanism is divided into multiple independent plate segments that can be individually adjusted. This segmentation allows selective closing of only the necessary sections while leaving other sections open for restraint member passage, reducing the overall number of plates that need to be manipulated during vehicle type changes.
4Manufacturing precision
If the discharge port is positioned close to the vehicle front surface, then the wind speed distribution uniformity is improved, but the interference with vehicle restraint members increases
Solution Approach 1:
The blowing duct is designed with adjustable plate configurations that allow the duct structure to be repositioned or reconfigured based on the specific vehicle and restraint member arrangement. This dynamic adjustment enables the discharge port to maintain its optimal position close to the vehicle front surface for uniform wind speed distribution while the plate configuration is adjusted to clear the specific restraint member paths.
Solution Approach 2:
The plate attachment parts are arranged asymmetrically at different heights and positions on the side walls, allowing customized configuration of the duct structure to accommodate specific restraint member layouts while maintaining optimal discharge port positioning for uniform wind speed distribution.
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 solution significantly reduces air leakage and ensures uniform wind speed distribution at the discharge port, improving the accuracy of vehicle running tests by accommodating various vehicle restraint member positions and vibrations.
Implementation Method 1
the vehicle restraint member such as a belt vibrates mostly vertically accompanying the acceleration or deceleration of the vehicle
Implementation Method 2
an elastic sheet member supported by being sandwiched between the inner plate and the outer plate
Data Source
AI summary
A duct body (101) of a blowing device provided in a chassis dynamometer includes a bottom wall (31), a top wall (32) and a pair of side walls (33) that form a flow passage having a rectangular cross section. In each of the side wall (33), a vertically elongated window part (42) is formed for enabling the passage of vehicle restraint member such as a chain (5). Each window part (42) is closed through the tiled arrangement of a few cover plates (53, 54), and a chain plate set (100). The chain plate set (100) is formed through the sandwiching of an elastic sheet member (61, 62) having a restraint member through hole (63) and a slit (64) between an inner plate (51) and an outer plate (52) each having an opening part (57, 58).