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A Method for Evaluating the Loose State of the Support of the Rotor-Bearing System

A state assessment and system dynamics technology, applied in the testing of machine/structural components, testing of mechanical components, instruments, etc., can solve problems such as the evaluation of looseness without support, to prevent catastrophic accidents, prevent large gaps from loosening, Guaranteed effect of accuracy and reliability

Active Publication Date: 2018-12-25
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] From the summary of the above brief research work, it is found that previous studies have focused on the study of the kinematic characteristics of the rotor-bearing system with loose support, while ignoring the influence of the change process of the loose clearance on the nonlinear dynamic behavior of the rotor-bearing system , and there is no research on the evaluation method for the loose state of the rotor-bearing system
At the same time, since the linear approximation method is mainly used to study the bearing looseness of the rotor-bearing system, there is no research on the evaluation of the bearing looseness of the rotor-bearing system from the perspective of the nonlinearity of the dynamic behavior of the rotor-bearing system.

Method used

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  • A Method for Evaluating the Loose State of the Support of the Rotor-Bearing System
  • A Method for Evaluating the Loose State of the Support of the Rotor-Bearing System
  • A Method for Evaluating the Loose State of the Support of the Rotor-Bearing System

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[0101] Select the rotor-sliding bearing as the calculation object, as follows:

[0102] In view of the strong nonlinear dynamic behavior that can be produced by the rotor-sliding bearing system, this paper uses the Runge-Kutta method with 4-5 step variable step size to simulate and calculate the dynamic model without loosening and the loosening dynamic model with support respectively. In order to ensure the convergence of the solution and reduce calculation errors, the integration step size and other parameters are selected in the simulation as h=π / 512; e=0.5×10 -4 m; m 1 = 32.1 kg; m 2 = 4kg; m 3 =10kg; k=2.5×10 7 N / m; k b1 =7.5×10 9 N / m; k b3 =7.5×10 7 N / m; c 1 =1050N·s / m; c 2 =2100N·s / m; c b1 =350N·s / m; c b2 =100N·s / m; c b3 =500N·s / m.

[0103] Take X=[x 1 ,y 1 ,x 2 ,y 2 ,x 3 ,y 3 ,y 4 ] is processed as follows, X'=X / c, X'=X' / (cω), X'=X' / (cω 2 ), where c is the average thickness of the lubricating film, and ω is the angular velocity of the shaft. Under ...

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Abstract

The present invention discloses a rotor-bearing system pedestal looseness state assessment method. The method comprises the following steps: 1) establishing an elastic force expression in a vertical direction generated by a gap of the rotor-bearing system caused by pedestal looseness, and establishing a non-linear dynamics model of the rotor-bearing system when there are pedestal looseness faults; 2) performing Taylor expansion of the nonlinear terms to obtain a linear approximation dynamical model, and comparing the non-linear model and the linear approximation model dynamic behavior; 3) calculating the nonlinear degree of the dynamic behavior of the rotor-bearing system with different-size looseness gaps; and 4) performing nonlinear fitting of the discretization result of the nonlinearity degree value, and establishing the corresponding relation between the pedestal looseness degree and the nonlinearity degree assessment value to realize the assessment of the rotor-bearing system pedestal looseness state. The rotor-bearing system pedestal looseness state assessment method can assess the rotor-bearing system pedestal looseness state to effectively avoid the occurrence of big gap looseness condition of the rotor-bearing system and avoid the occurrence of the disastrous accidents.

Description

technical field [0001] The invention relates to a method for evaluating the support loose state of a rotor-bearing system based on the nonlinear degree of system dynamic behavior. Background technique [0002] The rotor-bearing system is the core component of manufacturing systems such as machine tools in modern manufacturing technology. Looseness is caused by various reasons such as low installation quality and long-term periodic work. The rotor, support, and foundation of its components may become loose. It is one of several types of factors that are relatively common and have the greatest impact on accuracy and reliability. More importantly, the loose support significantly reduces the anti-vibration ability of the manufacturing system, making the vibration caused by the original misalignment problem more severe, directly affecting the accuracy and reliability of manufacturing systems such as machine tools, and even affecting the safe and efficient operation of the system,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 蒋勉伍济钢王钢彭鑫盛宾光富李学军林京
Owner HUNAN UNIV OF SCI & TECH
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