Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (5): 50-55.doi: 10.6040/j.issn.1672-3961.0.2020.009

• Mechanical, Energy and Power Engineering • Previous Articles     Next Articles

Vibration characteristics of flexible-blade Rushton impeller

Xin LIU1(),Fengling YANG1,2,3,*()   

  1. 1. School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Key Lab of High-Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061, Shandong, China
    3. National Experimental Teaching Demonstration Center of Mechanical Engineering(Shandong University), Jinan 250061, Shandong, China
  • Received:2020-01-10 Online:2020-10-20 Published:2020-10-19
  • Contact: Fengling YANG E-mail:LiuxinToDo@163.com;fly@sdu.edu.cn

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Abstract:

A natural frequency of a new type of flexible-blade Rushton impeller was studied to avoid a resonance phenomenon. The vibration characteristics of this impeller under stationary and rotating working conditions were experimentally investigated. Frequency domain characteristics were obtained by making Fast Fourier Transformation (FFT) of time domain characteristics. The results showed that a vibration energy of the impeller was mainly concentrated in a frequency band of 1-7Hz under the stationary state. A vibration energy of a rotating impeller with different speeds was mainly concentrated in a frequency bands corresponding to their respective peaks. Specifically, a peak acceleration distribution of acceleration data was shown in a frequency band of 47-52Hz. The acceleration amplitude increased significantly at 2.5r/s, and a main vibration frequency was equal to the natural frequency, which was 2.5Hz. So it was judged that resonance occured at this time. Therefore, the method of obtaining the resonance rotational speed through the test provided a basis for a reasonable selection of the rotational speed of the flexible-blade impeller.

Key words: stirred vessel, flexible-blade Rushton impeller, vibration characteristics, experimental measurement, resonance

CLC Number: 

  • TQ051

Fig.1

The stirred vessel and impeller"

Fig.2

The test device schematic and equipments"

Fig.3

The vibration characteristic curve of the flexible impeller blade at n=0 r/min"

Fig.4

The vibration characteristic curve of the flexible impeller blade at n=120r/min"

Fig.5

The vibration characteristic curve of the flexible impeller blade at n=150r/min"

Fig.6

The vibration characteristic curve of the flexible impeller blade at n=180r/min"

Fig.7

The vibration characteristic curve of the flexible impeller blade at n=240r/min"

Table 1

Measurement data of blade vibration characteristics"

转速/(r·min-1) 加速度幅值/(m·s-2) 主振频率/Hz
0 537.376 2.500
120 9.946 49.805
150 34.906 2.500
180 18.215 196.250
240 19.768 251.250
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