Dissertation > Excellent graduate degree dissertation topics show

Effect of the nonlinear harmonic resonance

Author: ZhaoCaiFeng
Tutor: GuoJianZhong
School: Shaanxi Normal University
Course: Acoustics
Keywords: Absorb vibration Amplitude frequency response The attenuation rate Rateof desensitization
CLC: O322
Type: Master's thesis
Year: 2013
Downloads: 17
Quote: 0
Read: Download Dissertation


In a single degree-of-freedom weakly nonlinear oscillator subjected to periodic external exaction,, a small excitation amplitude changes may cause a large vibration amplitude of the entire system, and at the same time may produce a jump and hysteresis phenomena in the system, resulting in instability of the system vibration, so always introduce a linear vibration absorber to suppress the nonlinear vibration system. At present, the linear vibration absorber and nonlinear vibration absorber is widely used to suppress the linear forced vibration systems, better inhibitory effect.In nonlinear systems, when the excitation frequency is close to the natural frequency of the system, the nonlinear amplitude frequency response curve will produce the phenomenon of multi-valued, making the system unstable, so the nonlinear vibration absorber is not suitable to control the nonlinear forced vibration. In this paper, the linear vibration control nonlinear forced vibration, focusing on studying the evaluation parameters.In this paper, following work has been done:(1)In one-degree-of-freedom system with quadratic, cubic and quartic nonlinearities, the effect of the change of inherent frequency, nonlinear parameter, excitation frequency and amplitude to system is investigated. Then the change of amplitude with time and the phase diagram are analyzed.(2)Vibration system is not stable due to small changes in the parameters, so the absorber is tried to introduce. In order not to influence the main structure nature of the system, the quality of the absorbing vibration ware which is introduced into should be less than the main structure. Then the corresponding mathematical model is established, and the perturbation method has been carried on the theoretical analysis of the model, simulating the amplitude frequency response curve of the system, and summed up the system before and after the vibration of the main resonance is suppressed and jumping disappear.(3)Base on theoretical analysis, the change of amplitude of the main structure and the change of amplitude of saddle-point bifurcation before and after vibration absorb joined are investigated, the attenuation ratio of response amplitude and the desensitisation ratio of the critical amplitude of excitation are put forward to suppress the effect.

Related Dissertations

  1. Admixture cement paste the acoustic characteristics of the experimental study of the,TE256
  2. The Study on Oscillating Period and Damping Characteristics of Ship Anti-rolling Tanks,U664.73
  3. The Design and Performance Analysis of Boring Bar with2-DOF Dynamic Vibration Absorber,TG53
  4. Research on Charge Multiplication in EMCCD and It’s Application on Photon Counting Imaging,TN386.5
  5. CDMA mode modem and filters,TN929.533
  6. Structural Design and Damping Properties of Steel/Zn Composite,TB331
  7. Research on high-voltage pulse delay line,TN782
  8. Multi-band electromagnetic protective fiber,TQ342.7
  9. Study on the Preparation and Loss about Hollow Optical Fiber for Solar Energy Transmission,TN253
  10. Atmospheric radiation characteristics and application of millimeter wave,TN015
  11. A Monitoring System Research of Coal Miner Personnel Positioning Based on RFID,TP277
  12. Research Synchronism Technology of Software Radio Receiver,TN851
  13. Research on the Propagation Characteristics of Electromagnetic Wave in Limited Space of the Underground Coal Mine,TD655.3
  14. Development and Applied Research of Environmental Chamber for Air Cleaner Detection,X851
  15. Vibration Analysis of Resonant Pressure Sensor,TP212.1
  16. Multi Fideld Coupled Dynamics Research of Micro Resonant Chemical Gas Sensor,TP212.2
  17. Nonalcoholic fatty liver disease and metabolic syndrome related index of quantitative diagnosis and serological study,R589
  18. A Preliminary Study in Differentiating Breast Benign Lesions from Malignant Tumors with Attenuation Rate of ADC Value,R445.2
  19. Key Techniques of Coal Gas Monitoring and Emission System Based on Zigbee and DSP,TP274
  20. Research on Energy Efficient Routing Technologies in Mobile Ad Hoc Networks,TN929.5

CLC: > Mathematical sciences and chemical > Mechanics > Vibration theory > Nonlinear vibration
© 2012 www.DissertationTopic.Net  Mobile