Modular Rain Nozzle Assembly for Uniform Vertical Rain Testing
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Solution Overview
Problem
Existing rain simulation systems fail to produce realistic and reproducible vertical rain conditions, lack modularity, and cannot control all realistic characteristics simultaneously, making them unsuitable for controlled testing of autonomous vehicle sensors in adverse weather.
Innovation Solution
A modular and portable rain simulation system with adjustable nozzle assemblies, reservoirs, and flow control components that simulate vertical rain patterns, allowing precise control over droplet size, intensity, and impact angle, suitable for both stationary and moving objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If existing rain simulation systems use spray nozzles to produce droplets, then rain coverage area is increased, but droplet size distribution becomes uneven and intensity distribution is non-uniform
Solution Approach 1:
The system divides the rain simulation into multiple independent nozzle assemblies, each responsible for a specific zone. This segmentation allows each nozzle to maintain precise droplet size control while collectively covering a large area, resolving the contradiction between coverage area and droplet uniformity.
Solution Approach 2:
Each nozzle assembly is equipped with independent flow control mechanisms to adjust droplet characteristics locally. This enables different regions to have optimized droplet sizes and intensities according to specific testing requirements, maintaining uniformity within each zone while achieving overall area coverage.
2Adaptability or versatility
If existing systems use fixed nozzle configurations, then system complexity is reduced, but the system cannot adapt to different testing conditions and object sizes
Solution Approach 1:
The nozzle assemblies are designed to be movable and reconfigurable along the support structure, allowing dynamic adjustment of nozzle positions, angles, and spacing. This enables the system to adapt to different object sizes and testing conditions without requiring complete system replacement, balancing versatility with manageable complexity.
Solution Approach 2:
The standardized nozzle assembly design serves multiple functions: it can be positioned at different locations, adjusted to various angles, and configured for different droplet patterns. This multi-functionality allows a single modular component to handle diverse testing scenarios, increasing adaptability without proportionally increasing overall system complexity.
3Reliability
If outdoor testing is used for realistic rain conditions, then test realism is improved, but control over test conditions is lost and reproducibility decreases
Solution Approach 1:
The system incorporates integrated flow control mechanisms that automatically regulate water delivery to each nozzle, ensuring consistent droplet production without manual intervention. This self-regulating capability maintains reproducible test conditions while simplifying operation, resolving the contradiction between reproducibility and ease of control.
Solution Approach 2:
The system includes sensors and control mechanisms that monitor droplet production and flow rates, providing feedback to maintain consistent rain simulation parameters. This closed-loop control ensures reproducible conditions while allowing operators to easily adjust settings without losing control, balancing reliability with operational ease.
4Ease of operation
If modular design is implemented for portability, then system mobility is improved, but connection and setup complexity increases
Solution Approach 1:
The system is divided into standardized modular components (nozzle assemblies, reservoirs, support sections) that can be independently handled and transported. This segmentation improves portability by allowing selective assembly of required components while reducing overall setup complexity through standardized interfaces and consistent connection protocols across all modules.
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
Enables realistic and reproducible simulation of rain conditions for evaluating Advanced Driver Assistance Sensors (ADAS) in various weather scenarios, ensuring consistent testing across different conditions.
Implementation Method 1
a series of nozzle assemblies for providing a vertical pattern of rain droplets by reducing pressure of water flowing through the nozzle assemblies at an outlet of the nozzle assemblies
Implementation Method 2
Connected to the nozzle assemblies is reservoir assembly for feeding liquid to the nozzle assemblies
Data Source
AI summary
A rain simulation system that replicates realistic raindrop characteristics for controlled testing is invented. The rain simulation system can be used as a stand-alone system with wind using a blower fan or in a wind tunnel, and without wind to create wind-driven and vertically falling rain droplets, respectively. In addition, methods to simulate rainfall for stationary and moving objects such as a road passenger vehicle are proposed. The rain simulation system is fully adjustable for a range of droplet size, impact velocity, rain intensity, rain coverage via the use of dripping nozzle devices and positioning of system components. The rain simulation system dispenses distinct droplets or continuous streams that can be broken down into droplets by wind. A rain nozzle device is coupled with a rain reservoir, and multiple nozzles are used to create a rain matrix, the full matrix is integrated with a rain rack and rainwater flow control strategy.