Research on Vibration Characteristics of the Three-Bearings Supporting Structure with Cracks in the Rotor of the 25Cr2Ni4MoV Exciter

2019 ◽  
Vol 893 ◽  
pp. 33-38
Author(s):  
Qing Meng Zeng ◽  
Zhi Min Liu ◽  
You Liang Chen ◽  
Fan Yang Meng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Critical Speed ◽  
Case Analysis ◽  
Element Model ◽  
Vibration Characteristics ◽  
Supporting Structure ◽  
Response Characteristics ◽  
Model Based ◽  
Set Up

Finite element model based on a unit with cracks in the rotor of the exciter is set up. Andthen critical speed is calculated that compared to actual measured value to verify the rationality of themodel. Lastly response characteristics of the three-bearings supporting structure are studied when thefirst critical speed of the exciter with cracks is closed to the working speed. And the reliability ofconclusions is further verified by case analysis.

Finite Element Model of Human Cochlea Considering of the Helicotrema Size

2013 ◽  
Vol 456 ◽  
pp. 576-581 ◽  
Author(s):  
Li Fu Xu ◽  
Na Ta ◽  
Zhu Shi Rao ◽  
Jia Bin Tian
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Basilar Membrane ◽  
Round Window ◽  
Element Model ◽  
Oval Window ◽  
Fe Model ◽  
Cochlear Duct ◽  
Human Cochlea ◽  
Set Up

A 2-D finite element model of human cochlea is established in this paper. This model includes the structure of oval window, round window, basilar membrane and cochlear duct which is filled with fluid. The basilar membrane responses are calculated with sound input on the oval window membrane. In order to study the effects of helicotrema on basilar membrane response, three different helicotrema dimensions are set up in the FE model. A two-way fluid-structure interaction numerical method is used to compute the responses in the cochlea. The influence of the helicotrema is acquired and the frequency selectivity of the basilar membrane motion along the cochlear duct is predicted. These results agree with the experiments and indicate much better results are obtained with appropriate helicotrema size.

Study on the Prediction of Drilling Forces on Cortical Bone Based on Finite Element Simulation

2013 ◽  
Vol 589-590 ◽  
pp. 157-162
Author(s):  
Ya Hui Hu ◽  
Qing Yun Zhang ◽  
Xiao Yu Yue
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Feed Rate ◽  
Orthogonal Experiment ◽  
Element Model ◽  
Drilling Speed ◽  
Drilling Force ◽  
Drill Diameter ◽  
Potential Damage ◽  
Set Up

The changes of drilling forces during bone drilling provide a useful index for evaluating the risk of potential damage to the bone. The aim of the work is that an elastic-plastic dynamic finite element model is used to simulate the process of a drill bit drilling through the bone. The finite element model was set up in the Abaqus6.11; the prediction model of the drilling force was gotten by using the regression orthogonal experiment and data processing software Matlab7.0. Diverse values of drilling speed, feed rate and drill diameter are important factors which will lead to changes in the drilling forces. By controlling the drilling parameters can obtain the optimal drilling force. The results show that the diameter has the greatest influence on the drilling force, the drilling speed the second, the feed rate the last.

Rotordynamics Analysis: Experimental and Numerical Investigations

2003 ◽  
Author(s):  
Jean-Jacques Sinou ◽  
David Demailly ◽  
Cristiano Villa ◽  
Fabrice Thouverez ◽  
Michel Massenzio ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Critical Speed ◽  
Experimental Tests ◽  
Element Model ◽  
Test Rig ◽  
Turbofan Engine ◽  
Rotating Structure ◽  
Vibration Problems ◽  
The Finite Element Model

This paper presents a research devoted to the study of vibration problems in turbofan application. Several numerical and experimental tools have been developed. An experimental test rig that simulates the vibrational behavior of a turbofan engine is presented. Moreover, a finite element model is used in order to predict the non-linear dynamic behavior of rotating machines and to predict the first critical speed of engineering machine. A comparison between the experimental tests and the numerical model is conducted in order to evaluate the critical speed of the rotating structure and to update the finite element model.

Dynamics Research of Ultrasonic Peristaltic Micro-Fluid Driving Model

2011 ◽  
Vol 199-200 ◽  
pp. 1391-1396
Author(s):  
Dan Dan Zhang ◽  
Shou Shui Wei ◽  
Guo Lei Wang ◽  
Chang Zhi Wei
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Traveling Wave ◽  
Element Model ◽  
Transient Dynamics ◽  
Dynamics Analysis ◽  
Response Characteristics ◽  
Amplitude Frequency Response ◽  
Driving Model ◽  
Frequency Response Characteristics

A new ultrasonic peristaltic micro-fluid driving model was presented on the principle of ultrasonic traveling wave and volume displacing mechanism. First, driving principle of the model was introduced and finite element model was developed. Second, the transient dynamics analysis was performed to observe the chambers traveling and the fluid flowing. What’s more, harmonic analysis was done to get its amplitude-frequency response characteristics. Third,the coupling modes filled with fluid was performed to prove its drivng effect. This can provide a guidance for furture fluid structure analysis to get better performance and efficiency.

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