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A Method for Predicting Fundamental Frequency of Coupled Vibration of Equipment and Open Stiffened Plate Based on Spring-mass String Model

A technology of open stiffened plate and string model, applied in design optimization/simulation, instrumentation, calculation, etc., can solve the problems of large amount of calculation, inapplicability, time-consuming, etc., and achieve simple calculation, simplified solid model, and reduced complexity Effect

Active Publication Date: 2018-10-16
BEIHANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, if the finite element method is used for dynamic analysis of the overall structure composed of equipment and open stiffened plates, the overall structure must be remodeled and calculated every time the parameters are adjusted. The matching of elements and the simulation of connection sections are time-consuming during the modeling process, therefore, the finite element method is not suitable for the scheme design stage

Method used

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  • A Method for Predicting Fundamental Frequency of Coupled Vibration of Equipment and Open Stiffened Plate Based on Spring-mass String Model
  • A Method for Predicting Fundamental Frequency of Coupled Vibration of Equipment and Open Stiffened Plate Based on Spring-mass String Model
  • A Method for Predicting Fundamental Frequency of Coupled Vibration of Equipment and Open Stiffened Plate Based on Spring-mass String Model

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Embodiment

[0088] In order to understand more fully the characteristics of this invention and its applicability to engineering practice, the present invention uses image 3 The coupling system of local equipment racks and open-stiffened panels of the ship superstructure shown in the figure is taken as an example to verify the fundamental frequency prediction. The equipment frame and the open stiffened plate are connected by bolts, the connection form is as follows Figure 4 shown. Divide the coupling system into two substructures at the connection section, the equipment frame and the open stiffened plate, such as Figure 5 shown. The open stiffened panel is a panel frame structure composed of a panel with a rectangular opening in the center, a T-shaped reinforcing frame at the edge of the mouth, and a one-way T-shaped reinforcing rib. The dimensions are shown in Table 1; the equipment panel frame is composed of panels and L-shaped angle steel around The dimensions of the frame structure...

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Abstract

The invention discloses a method for predicting equipment and opening stiffened plate coupled vibration base frequency based on a spring-mass block string submodel. The method comprises the following steps of firstly separating an integral structure into two sub structures including equipment and an opening stiffened plate; then, performing modal analysis on the sub structures; calculating the modal mass and the modal stiffness of the first-order natural vibration of each sub structure through displacement normalization processing; by aiming the integral structure, building a two-freedom spring-mass block string submodel, and building a free vibration kinetic equation of a mechanical model; calculating the first-order natural vibration frequency by combining the modal parameter of the sub structures; and using the first-odor natural vibration frequency as a prediction value of the equipment and opening stiffened plate coupled vibration base frequency.

Description

technical field [0001] The invention relates to the technical field of prediction of coupling vibration characteristics of equipment and an opening structure, in particular to a method for predicting fundamental frequency of equipment and opening stiffened plate coupling vibration based on a spring-mass string model. Background technique [0002] Structures with openings are widely found in ships, aerospace, automobiles and many other engineering structures. Openings not only provide convenience for equipment installation, process construction, inspection and maintenance, pipeline passage, etc., but also reduce the weight of the structure. Especially in ship engineering, due to the need for stealth performance, the integrated superstructure has become a hot spot in the development of navies in various countries. The destroyer DDG-1000 developed by the United States adopts the integrated superstructure joint aperture antenna layout. To adopt an integrated superstructure, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 邱志平朱静静王晓军吕峥王鹏博王冲陈贤佳
Owner BEIHANG UNIV
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