科研之友
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摘要
Background Vibratory compactor that depends on the principle of vibration is important in earthwork and pavement building. The compactor is an important technical equipment in transportation and energy development. However, in the practical application of vibratory engineering, shortage of traditional construction design and the effects of nonlinear chaos vibration on human health are ignored. @@@ Objective Our objective was to explore a simple non-smooth collision model that could effectively represent the dynamic properties of practical system during compaction to eliminate the nonlinear chaotic responses of mechanical structure and to reduce irregular vibration that is harmful to the physical and mental health of operators. @@@ Methods An advisable construction method for pavement material compaction based on chaotic identification is proposed. A simple non-smooth dynamic model that supposes generalized restoring force was established for a compacting system by introducing dimensionless variables. The dynamic responses of an excitation system were analyzed by time domain, phase diagram, Poincare section, power spectrum, and bifurcation diagram methods. Moreover, the advisable construction method based on chaotic identification was applied to field tests on asphalt construction by using a YZC12 vibratory roller compactor on the Beijing-Fuzhou highway. @@@ Results Research showed that the dynamic characteristics of excitation system were experienced from a single cycle, single periodic bifurcation, a double cycle, and double periodic bifurcation until chaos evolution because of different model parameters that represented all types of working conditions. Results also showed that for the earlier stage of compacted material, dimensionless angular frequency might be reasonably selected within the range of 1.69 to 2.21 under large exciting forces. For the later stage of compacted material, dimensionless angular frequency might be selected within the range of 1.75 to 2.13 under large exciting forces or within the range from 1.64 to 2.25 under small exciting forces. Such a situation could weaken the nonlinear characteristics of a dynamic system to avoid chaotic vibration. Test results showed that the higher density compacting construction, the smaller exciting force with higher vibration frequency were suitable for eliminating the nonlinear chaos of a dynamic system. @@@ Conclusions Such dynamic nonlinearity elimination could improve the driver's comfort and extend the service life of vibratory machinery equipment. The results obtained using the non-smooth model and the construction method based on chaotic identification were appropriate for engineering applications.
- 出版日期2018-2
- 单位福州大学
