Port Plate Geometry for Stable Integrated Drive Generator Output
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Solution Overview
Problem
Integrated drive generators in aircraft face challenges in maintaining a constant frequency of generated electric power due to varying input shaft speeds, which affects the design of port plates in their hydraulic units.
Innovation Solution
A port plate design with a semi-cylindrical charge port and diametrically opposed working pressure ports, featuring specific angular orientations and drainage passages, is introduced to stabilize fluid flow and pressure distribution within the hydraulic units, ensuring consistent speed and frequency output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional port plate design is used, then the structure is simple, but the fluid flow and pressure distribution are unstable leading to variable output speed and frequency
Solution Approach 1:
The port plate design applies local quality by creating specific geometric features at particular locations: semi-cylindrical charge ports with optimized angles (15-25 degrees) relative to the center plane, and specifically positioned working pressure ports. These localized geometric modifications improve fluid flow stability and pressure distribution in critical areas without redesigning the entire port plate structure.
Solution Approach 2:
The invention changes geometric parameters of the port plate to optimize performance. The charge ports are designed with specific angular orientations (15-25 degrees from the center plane) and semi-cylindrical shapes, while working pressure ports are positioned at specific locations. These parameter changes stabilize fluid flow characteristics and pressure distribution, enabling constant output speed and frequency despite varying input shaft speeds.
2Adaptability or versatility
If the input shaft speed varies, then the generator can adapt to different operating conditions, but the generated electric power frequency becomes variable
Solution Approach 1:
The port plate design works in conjunction with the hydraulic units to create a feedback mechanism. The optimized port geometry stabilizes fluid flow and pressure distribution, which improves the responsiveness and accuracy of the hydraulic control system in regulating the differential output speed to maintain constant frequency electric power generation across varying operating conditions.
Data Source
AI summary
A port plate for use in an integrated drive generator has a body defining a semi-cylindrical charge port communicating with two circumferentially smaller charge port portions. A diametrically opposed working pressure port has three smaller working pressure ports. A center plane is defined extending through a center axis of a bore within the body and equidistance between circumferential ends of the charge port and the working fluid port. A first angle is defined between the plane and a circumferential end of the smaller charge port. The first angle is between 15 and 25 degrees. An integrated drive generator and a method are also disclosed.