Prediction method for inherent frequency of rotating blade
A technology of rotating blades and natural frequency, which is applied in the field of prediction of the natural frequency of rotating blades, and can solve problems such as unqualified quality of rotating blades and inaccurate prediction of rotating blades
Active Publication Date: 2019-10-08
NORTHEASTERN UNIV LIAONING
View PDF3 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The present invention aims at the inaccurate prediction of the natural frequency of the rotating blade due to ignoring the influence of the flexibility of the turntable on the natural frequency of the rotating blade in the prior art, Finally, after the actual production of the designed rotating blades, the quality of the rotating blades is unqualified, and a method for predicting the natural frequency of the rotating blades is provided
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
[0074] In order to explain the present invention better, so that understand, below in conjunction with appendix Figure 1-4 , the present invention will be described in detail through specific embodiments.
[0075] In this specific embodiment, it is assumed that in the turntable-blade coupling system, three identical rotating blades are evenly distributed on the outer edge of the turntable, namely: the first rotating blade, the second rotating blade and the third rotating blade; The blades are fixedly connected.
[0076] Select the geometric parameters and simulation parameters of the turntable-blade coupling system as follows:
[0077] Table 1 Material parameters and geometric parameters of the turntable-blade coupling system.
[0078]
[0079] According to the parameters given in Table 1, a method for predicting the natural frequency of a rotating blade of the present invention, the specific method is as follows:
[0080] Step Q1, establishing the coordinate system of ...
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 provides a prediction method for inherent frequency of a rotating blade. The prediction method comprises the following steps: obtaining a mass matrix M of a turntable-blade coupling system, the stiffness matrix Ke, a rotational stiffness matrix K Omega, and a gyro matrix G; obtaining natural frequency of the rotating blade in the turntable-blade coupling system based on the acquireddata information and a preset rotational speed Omega of the turntable-blade coupling system; determining whether the natural frequency of the rotating blade falls within the range of the excitation frequency to which the turntable-blade coupling system belongs, and determining whether the turntable-blade coupling system satisfies the production condition according to a judgment result. According to the data parameter obtained by the invention, according to the calculation formula of the natural frequency of the rotating blade, the natural frequency of the rotating blade can be predicted, and the natural frequency of the rotating blade is compared with the excitation frequency, so that the rotating blade conforming to the actual production condition can be determined. Production is carriedout to pass the quality of the designed rotating blades and to reduce the production cost.
Description
technical field [0001] The invention belongs to the technical field of mechanical dynamics, in particular to a method for predicting the natural frequency of a rotating blade. Background technique [0002] At present, before the actual production of the turntable-blade coupling system, it is necessary to design the rotating blades. In the actual engineering design, it is considered that the natural frequencies of all the rotating blades on the turntable are the same, ignoring the effect of the turntable flexibility on the rotation. Therefore, the predicted natural frequency of the rotating blade does not match the actual natural frequency of the rotating blade. As a result, after the actual production of the designed rotating blade, the quality of the rotating blade is unqualified, and it is easy to be consistent with the external excitation frequency. Resonance causes high cycle fatigue failure of the blade. Contents of the invention [0003] (1) Technical problems to be...
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 Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/11G06F17/16G06Q10/04G06Q50/04
CPCG06Q10/04G06Q50/04G06F17/11G06F17/16G06F30/17G06F2119/06G06F30/20Y02P90/30
Inventor 李朝峰佘厚鑫唐千升刘晓文程昊
Owner NORTHEASTERN UNIV LIAONING