Vehicle Aerodynamic Drag Reduction via Controlled Surface Vibration
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Solution Overview
Problem
Current methods fail to effectively reduce aerodynamic drag in unoccupied vehicles, which limits fuel efficiency and increases fuel costs and emissions.
Innovation Solution
A method and system that apply controlled vibrations to external surfaces of unoccupied vehicles at specific frequencies and amplitudes, determined by sensors and processors, to minimize drag and optimize energy savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If aerodynamic drag reduction methods are applied to occupied vehicles, then fuel efficiency is improved, but the methods may cause discomfort or safety issues for occupants
Solution Approach 1:
The patent applies different vibration characteristics to different regions of the vehicle exterior surface. Specifically, high-frequency vibrations are applied to regions where they reduce drag effectively without affecting occupants, while avoiding application to surfaces near occupants. This localized differentiation resolves the contradiction by maintaining fuel efficiency benefits while eliminating harmful effects to occupants.
Solution Approach 2:
The system dynamically adjusts vibration parameters (frequency, amplitude, duration, and location) based on real-time detection of vehicle occupancy status and driving conditions. When occupants are detected, the system modifies or discontinues vibration application to those areas. This dynamic adaptation allows the system to maximize drag reduction during unoccupied periods while ensuring occupant comfort and safety during occupied periods.
2Force
If high amplitude vibrations are applied to reduce aerodynamic drag, then drag reduction effectiveness is improved, but energy consumption of the vibration system increases
Solution Approach 1:
The patent applies partial vibration action by selecting specific exterior surfaces and frequency ranges that provide sufficient drag reduction without requiring maximum amplitude vibrations across the entire vehicle. The system identifies optimal vibration parameters that achieve the minimum effective drag reduction threshold while consuming less energy, rather than applying excessive vibration energy that would yield diminishing returns.
Solution Approach 2:
The system continuously optimizes vibration parameters (frequency, amplitude, pulse duration, and duty cycle) to achieve the most efficient drag reduction. By adjusting these parameters in real-time based on vehicle speed, atmospheric conditions, and drag measurements, the system finds the optimal balance between drag reduction effectiveness and energy consumption, avoiding both insufficient and excessive vibration application.
3Use of energy by moving object
If continuous vibration is applied to external surfaces, then aerodynamic drag is continuously reduced, but device complexity and control requirements increase
Solution Approach 1:
The patent employs periodic vibration pulses rather than continuous vibration. The system applies vibrations in controlled cycles with specific duty cycles (on-time versus off-time periods), allowing the boundary layer to reset and preventing diminishing returns from continuous vibration. This periodic approach maintains effective drag reduction while simplifying control requirements compared to continuous vibration systems.
Solution Approach 2:
The system incorporates sensors that automatically detect vehicle occupancy, atmospheric conditions, and drag characteristics, enabling the vibration system to self-regulate its operation. The control system automatically adjusts vibration parameters based on sensor feedback without requiring complex external control, allowing the system to optimize its own operation and reduce overall system complexity.
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 controlled vibrations significantly reduce aerodynamic drag, leading to improved fuel efficiency and energy savings by analyzing vehicle parameters and adjusting the vibration parameters in real-time to optimize aerodynamic performance.
Implementation Method 1
applying a controlled vibration with a selected amplitude and a selected frequency to a external surface of the vehicle
Data Source
AI summary
Vehicles and methods for controlling operation of a vehicle and/or reducing aerodynamic drag of a vehicle are provided. A method for controlling operation of an unoccupied vehicle includes determining that the vehicle is unoccupied. The method further includes identifying an energy savings resulting from a reduction of aerodynamic drag of the vehicle due to a controlled vibration of a component of the vehicle. Also, the method includes applying the controlled vibration to the component of the vehicle.