Determination method for inherent frequency of rotor-blade coupled system

A technology for coupling systems and determining methods, applied in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2014-11-26
NORTHEASTERN UNIV
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Problems solved by technology

[0009] By establishing the dynamic model of the rotor-blade coupling system, the natural frequency of the system is theoretically deduced; however, the existing rotor-blade coupling dynamic model mainly considers the influence of the torsion of the rotor shaft and the bending deformation of the blade, and the existing The dynamic model is still applicable to the ideal system structure of the optical axis, and the technology for the lateral and torsional motion of the complex stepped axis and the coupling effect of the blades is blank

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  • Determination method for inherent frequency of rotor-blade coupled system
  • Determination method for inherent frequency of rotor-blade coupled system
  • Determination method for inherent frequency of rotor-blade coupled system

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Embodiment Construction

[0143] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

[0144] In the embodiment of the present invention, the system test bench such as figure 1 As shown, 1 indicates the motor (model YVP100L2-3), 2 indicates the elastic coupling (model YLD7), 3 indicates the left bearing, 4 indicates the right bearing, 5 indicates the stepped shaft, 6 indicates the disc and 7 indicates the blade. The geometric parameters of the shaft are shown in Table 1. The radius and thickness of the disk are 140mm and 58mm, respectively. The length, width and thickness of the blades are 82mm, 44mm and 3mm, respectively. The material parameters of rotor and blade are: Young's modulus E=200GPa, density ρ=7800kg / m 3 and Poisson's ratio υ = 0.3. The two ball bearings are identical, both simulated by linear springs and dampers, ignoring cross-coupling terms, and the horizontal and vertical rigidities are assumed to be k bx1 =k by1 =k...

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Abstract

The invention belongs to the technical field of mechanical dynamics, and relates to a determination method for the inherent frequency of a rotor-blade coupled system. The determination method saves the cost of a sensor, an amplifier and a display or record instrument needed by experimental tests and can obtain the higher-order inherent frequency and the inherent frequency in a rotating state. The inherent frequency of the rotor-blade coupled system can be obtained just by modifying the structural size of the system without repeated modeling, the bending and torsion influence on a complex stepped rotating shaft of the coupled system, the gyroscopic effect of a shaft and a disc, centrifugal rigidifying, rotary softening and the Coriolis force influence on blades are considered so that a more accurate result can be obtained; in addition, imbalance responses, blade tip rub-impact and other faults of the rotor-blade coupled system can be analyzed, so that the system structure is optimized.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, and in particular relates to a method for determining the natural frequency of a rotor-blade coupling system. Background technique [0002] At present, the existing methods for determining the natural frequency of the rotor-blade coupling system mainly include the following methods: [0003] 1. Based on experimental testing [0004] The natural frequency test is to obtain the characteristic parameters such as the natural frequency through sensors, amplifying instruments, and display or recording instruments, so as to serve the dynamic design of mechanical or engineering structures. [0005] The hammer excitation method has the characteristics of convenient testing and simple equipment required, and has become the preferred method for testing the natural frequency; using the hammer excitation method, the ratio of the response signal and the wide-band force signal excited by the hammer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 马辉太兴宇吴志渊闻邦椿
Owner NORTHEASTERN UNIV
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