Coaxial rotor blade tip distance real-time estimation method
A technology of rotor blades and rotor blades, which is applied in the field of motion monitoring of helicopter hingeless rotor blades, can solve problems such as complex processing technology, inability to calculate blade tip spacing in real time, increase blade production costs, etc., and achieve low delay , high precision, low cost effect
Active Publication Date: 2021-07-09
CHINA HELICOPTER RES & DEV INST
View PDF18 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] There are two methods for measuring the pitch of the existing coaxial rotor blade tips. It can be directly measured by contact, such as a radar ranging system arranged at the blade tip, but the radar ranging system needs to arrange a transmitter and a receiver at the blade tip. The production cost of the propeller is increased, and the processing technology is also much more complicated; it can also be estimated by non-contact measurement, such as a high-speed camera system. The non-contact high-speed camera system cannot calculate the tip distance in real time, so it cannot meet the requirements of real-time monitoring. requirements, and the high-speed camera system is not suitable for field test flight scenarios
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0043] Such as figure 1 As shown, a method for real-time estimation of the coaxial rotor blade tip spacing, the coaxial rotor includes an upper rotor blade and a lower rotor blade, and the upper rotor blade and the lower rotor blade will be in the forward flight process The lift bias is generated, resulting in the tip distance reaching the minimum value in a specific orientation, and there is a risk of collision. The present invention provides ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of helicopter hinge-free rotor blade motion monitoring, and relates to a coaxial rotor blade tip distance real-time estimation method. The method has good coupling property based on the flapping strain, and can eliminate the influence of blade shimmy, torsion and centrifugal load in an actual test, thereby obtaining accurate flapping displacement parameters. Based on the good coupling property of the flapping strain, the influence of the blade shimmy, torsion and centrifugal load can be eliminated in the actual test, so that the accurate flapping displacement parameters are obtained. Compared with non-contact measurement methods such as high-speed camera shooting, the method for estimating the tip displacement through flapping displacement fitting has the advantages of low time delay, low cost, high precision and the like.
Description
technical field [0001] The invention belongs to the technical field of motion monitoring of helicopter hingeless rotor blades, and in particular relates to a method for real-time estimation of the distance between coaxial rotor blade tips. Background technique [0002] For the new helicopter rotor system, under the premise of maintaining flight safety and no redundant design, the premise of maximizing maneuverability is to be able to monitor the distance between the rotor tips in real time. Especially for coaxial multi-rotors, when the upper and lower rotors are introduced, the tip spacing becomes an important design constraint and flight monitoring requirement. Therefore, how to evaluate the tip spacing between the upper and lower rotors is very important for ensuring test and flight safety. [0003] There are two methods for measuring the pitch of the existing coaxial rotor blade tips. It can be directly measured by contact, such as a radar ranging system arranged at the b...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): B64F5/60
CPCB64F5/60
Inventor 陈焕余莹汪文涛刘正江陈垚峰
Owner CHINA HELICOPTER RES & DEV INST