Investigation of complex structure systems based on spectral analysis
DOI:
https://doi.org/10.15587/2312-8372.2019.188059Keywords:
vibration spectrum, natural vibration frequencies, dynamic load, vibration diagnostics, spectral powerAbstract
The object of research is the process of processing the results of the movement of vibration-absorbing machines in the construction industry. One of the problems in the study of technological vibration machines is the determination of the parameters of the spatial motion of the working bodies of the machine and establishing their compliance with the calculated ones obtained as a result of calculations or numerical simulation. And also when establishing the state of structures under the influence of complex dynamic effects. Difficulties arising in the study of dynamic processes are caused by the determination of the nature and actual values of dissipative forces, the influence of unknown random variables, including interference and imperfections in the measuring technique.
The approach proposed in this paper is based on the hypothesis of considering a system of complex structure, has a dynamic effect as a single system with its corresponding dynamic characteristics. The implementation of this approach can be carried out by determining the dynamic parameters of the system with subsequent spectral analysis and the establishment of the main vibration frequencies that are due to external influence, as well as the identification and clear identification of higher harmonics. Recordings of continuous fixation of the vibration process with a known frequency of external influence are used to determine the necessary effective method for presenting the results. Further processing of such results on the basis of the spectral-correlation method makes it possible to determine an effective way to determine the fundamental frequency, to reveal the influence of higher harmonics and extraneous frequencies inherent in the investigated process. The vibration spectra in the linear and logarithmic scales with acceleration and spectral power are considered. According to the research results, it is found that the use of precisely the spectral power of the signal level is an effective method for determining the dynamic process and performing an integral assessment of the overall system.
The obtained research results can be used in the study of systems with complex motion with unknown parameters of external influence when performing diagnostics and evaluating the technical condition of technological machines, the vibrations of the supporting and enclosing structures of buildings.References
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Copyright (c) 2019 Ivan Nazarenko, Oleg Dedov
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