Wedge Water Entry Test Device with Pneumatic Acceleration
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Solution Overview
Problem
Existing water entry test devices for naval architecture and marine engineering face challenges such as larger overall size, lower water entry velocity, and inconvenient implementation due to high conditions required for testing.
Innovation Solution
A test device for acceleratory oblique water entry of a wedge, utilizing an air compressor and air cylinder to accelerate the wedge into the water at a required angle and velocity, equipped with an observation system to measure pressure, deformation, and flow field changes, ensuring stability and repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If free fall method is used for water entry test, then the test implementation is simple, but the water entry velocity is low
Solution Approach 1:
The air cylinder pre-accelerates the wedge before water entry, giving it an initial velocity. This preliminary action allows the wedge to enter water at higher speed without requiring a longer drop height, thus improving water entry velocity while keeping the device compact.
Solution Approach 2:
The patent uses an air cylinder driven by an air compressor to provide pneumatic propulsion for accelerating the wedge. This pneumatic system efficiently increases the water entry velocity without significantly increasing the overall device size or complexity.
2Volume of stationary object
If traditional water entry test device is used, then the structure is simple, but the overall size is large
Solution Approach 1:
By pre-accelerating the wedge using the air cylinder before water entry, the required drop height is reduced. This allows the test device to be more compact while still achieving high water entry velocities, effectively reducing the overall device size without sacrificing speed performance.
Solution Approach 2:
The patent introduces a horizontal acceleration dimension through the air cylinder, complementing the vertical drop motion. This multi-dimensional approach allows the wedge to gain velocity in both horizontal and vertical directions, reducing the required vertical drop distance and thus the device height.
3Speed
If high velocity water entry test is required, then the test conditions are demanding, but the implementation is inconvenient
Solution Approach 1:
The air cylinder and air compressor system provides a convenient and controllable method to achieve high water entry velocities. The pneumatic system is easy to operate and can be precisely controlled to meet different test velocity requirements, making high-speed water entry testing convenient to implement.
Solution Approach 2:
The air cylinder allows easy adjustment of the acceleration parameters (pressure, duration) to achieve different water entry velocities. This parameter controllability makes it convenient to conduct tests at various velocity levels without changing the basic test setup, improving operational flexibility and convenience.
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 device allows for accurate observation of water entry phenomena at controlled velocities and angles, providing a compact, cost-effective, and repeatable testing process with improved velocity and angle control compared to traditional methods.
Implementation Method 1
The air compressor drives the air cylinder to generate thrust to push the fastening slide block of the transverse slide rail
Implementation Method 2
By controlling different output pressure of the air compressor, the air cylinder generates different thrust to achieve different water entry velocity of the wedge
Implementation Method 3
A head of a piston rod of the air cylinder is provided with a flat plate having the same area of the top of the fastening slide block of the transverse slide rail, which is used to increase a contact area between the head and the slide block to provide more stable and uniform force
Implementation Method 4
observing the changes of local pressure, deformation quantity and flow field in the process
Implementation Method 5
observing the changes of local pressure, deformation quantity and flow field in the process
Implementation Method 6
observing the changes of local pressure, deformation quantity and flow field in the process
Data Source
AI summary
A test device suitable for acceleratory oblique water entry of a wedge has a frame, a water tank placed below the frame, an accelerator installed above the frame, an obliquing device connected to the frame, a wedge connected to the obliuqing device and an observation system. The frame is provided with vertical slide rails and a transverse slide rail. The accelerator mainly includes an air cylinder and an air compressor. The wedge is a flexible wedge or a rigid wedge. The observation system includes a pressure sensor, a strain sensor, a velocity sensor, an acceleration sensor and a particle image velocimetry device. The repeatability of the test process can be ensured by controlling the output pressure of the air cylinder.