Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Helicopter vibration load simulation analysis method based on finite elements

A technology of vibration load and simulation analysis, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as peak acceleration and difficult simulation calculations

Inactive Publication Date: 2019-08-02
NORTHWESTERN POLYTECHNICAL UNIV
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the helicopter vibration load spectrum in the frequency domain given by GJB150.16A, the random vibration acceleration power spectral density can be directly calculated as the input load, but the peak acceleration is difficult to directly simulate and calculate

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Helicopter vibration load simulation analysis method based on finite elements
  • Helicopter vibration load simulation analysis method based on finite elements
  • Helicopter vibration load simulation analysis method based on finite elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0036] The model adopted is a certain type of helicopter tail control rod support, which is located in the tail rotor influence area of ​​the helicopter fuselage, such as Figure 4 shown. The models used in the examples can also be replaced with other models.

[0037] The specific steps of the simulation analysis method of helicopter vibration load based on finite element analysis are as follows:

[0038] Step 1: According to the overall vibration environment load spectrum and extraction method of the helicopter in GJB150.16A-Table C.4, extract the random vibration load spectrum curve, see Figure 5 ;Sure figure 1 Coordinates of each node in the load spectrum, extract the peak acceleration of each peak, see Image 6 ;

[0039] Step 2: Use the MSC.Patran finite element platform to process Image 6 Medium peak acceleration load; process each peak acceleration...

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

No PUM Login to View More

Abstract

The invention relates to a helicopter vibration load simulation analysis method based on a finite element. The helicopter vibration load simulation analysis method comprises the steps that according to the helicopter overall vibration environment load spectrum in the table C.4 of GJB150.16 A and the extraction method, the peak acceleration of each peak value is extracted; a random vibration load spectrum curve is extracted; the peak acceleration of each peak value is processed into a trapezoidal narrow-band peak load spectrum curve, the random vibration load spectrum curve and the trapezoidalnarrow-band peak load spectrum curve are taken as input loads of an MSC.Patran finite element platform, and fatigue lives T1 and T2 are obtained in two vibration environments; and the comprehensive fatigue life under the action of random vibration and peak acceleration under the broadband background is obtained. According to the method, finite element simulation can better fit the vibration durability test, and the finite element is more accurate and effective as an auxiliary tool.

Description

technical field [0001] The invention belongs to a helicopter vibration load simulation analysis method, and relates to a helicopter vibration load simulation analysis method based on finite elements, which provides a processing method for helicopter special vibration environment loads and a calculation method for the life of helicopter parts in this environment. Background technique [0002] The helicopter vibration environment is a special vibration environment. According to GJB150.16A, the helicopter vibration characteristic is a single-frequency spike superimposed on the broadband background. Spikes are sinusoidal waves generated by rotating parts or machinery such as propellers, and the broadband background is a mixture of low-level sinusoidal components and random vibration components caused by aerodynamic noise. The vibration load spectrum is as follows: figure 1 shown. This kind of vibration environment is different from military equipment such as fixed-wing aircraf...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23G06F2119/06
Inventor 苏云征樊高宇黄斌根张威刘肖汗宋亚丽
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com