Offset Spoiler Design for Semi-Rigid Wiper Blade Aerodynamics
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Solution Overview
Problem
Existing semi-rigid windscreen wiper blades face challenges in optimizing aerodynamic forces to maintain effective wiping efficiency while minimizing motor consumption, as excessive lift can lead to detachment and increased friction, while insufficient lift results in wiping faults.
Innovation Solution
The design incorporates a spoiler that extends horizontally beyond a mirrored part of the body relative to a vertical plane passing through the scraper blade's lower end, optimizing aerodynamic lift and reducing drag by modifying the aerodynamic profile and positioning of the spoiler, which enhances the intensity and direction of aerodynamic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the spoiler is extended horizontally beyond the mirrored part of the body, then aerodynamic lift is optimized and drag is reduced, but the device complexity increases
Solution Approach 1:
The spoiler is designed with asymmetric extension beyond the mirrored part of the body, creating an unbalanced aerodynamic profile that optimizes lift and drag characteristics. The spoiler extends horizontally beyond the vertical plane passing through the lower end of the scraper blade, creating asymmetric airflow patterns that reduce drag while maintaining effective lift forces.
Solution Approach 2:
The spoiler configuration adds a horizontal dimension to the aerodynamic profile by extending beyond the mirrored part of the body. This dimensional extension creates additional aerodynamic surfaces that interact with airflow, optimizing the balance between lift and drag forces without requiring vertical height increases.
2Force
If the aerodynamic profile is modified to optimize lift, then blade attachment to windshield is maintained, but drag increases
Solution Approach 1:
The aerodynamic profile employs asymmetric design where the spoiler extends horizontally beyond the mirrored part of the body, creating different airflow characteristics on each side. This asymmetry allows optimization of lift forces while managing drag through controlled airflow separation and attachment patterns.
Solution Approach 2:
The aerodynamic parameters are optimized by adjusting the spoiler's horizontal extension distance and vertical positioning. The profile shape, angle of attack, and surface area are tuned to achieve the optimal balance between generating sufficient lift for blade attachment and minimizing drag forces that would increase motor consumption.
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 reduces motor consumption by optimizing aerodynamic forces, maintaining effective blade attachment to the windshield while minimizing drag, thus improving wiping efficiency and reducing the risk of detachment.
Implementation Method 1
a spoiler, or spoiler , shaped like an airfoil that uses the wind created by the speed of the vehicle to exert a force to hold the blade against the windshield. The resultant of these aerodynamic forces breaks down into a first force, called lift, and a second force, called drag.
Data Source
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AI summary
The invention relates to a windshield wiper blade for a vehicle, particularly an automobile, comprising a scraper blade (1), a body (2) to which said scraper blade (1) is attached, and a spoiler (3) extending from said body and having an aerodynamic profile between a leading edge and a trailing edge, the boundary of the wiper blade between the body (2) and the spoiler (3) being defined by a horizontal surface extending through the leading edge of said profile, characterized in that said spoiler extends horizontally in the downstream direction beyond an optionally abstract portion defined so as to constitute the mirror image, relative to a vertical plane extending through a lower end of the scraper blade (1), of the portion of the body that is located upstream of said same vertical plane.