No abstract

In this work we consider a nonlinear dynamical system which is a set of nonlinear oscillators coupled by springs with hysteretic blocks (hysteretic sine-Gordon model). The hysteretic nonlinearity is modeled using the phenomenological Bouc-Wen model). The wave processes (solitonic solutions) in such a system are investigated taking into account the hysteretic nature of the coupling.

In this article, a model of an energy harvester, the mechanical part of which is an inverted pendulum, is proposed. We investigated the stability of a linearized system. It was proven that the stabilizing control of the pendulum, based on the feedback principle, enables the stabilization of the system. We have identified the zones of stability and the amplitude–frequency characteristics. In the second part of this article, a generalization of the dynamic system for the case of the hysteresis friction in the mechanical joint is considered. The role of nonlinear effects within the design Preisach model and the phenomenological Bouc–Wen model is shown.

The current technical condition of a multi-storey frame building structures is studied. The survey is carried out for individual structural elements of the object, which makes it possible to determine the actual technical condition of the building and its constituent elements. Additional damage and defects appeared at the object under study due to the forced break in construction. Verification calculations of the non-existent capacity of structures were performed based on the results of the technical condition monitoring. The existing real operational loads and impacts were taken into account in the calculations for the actual design schemes. The results of field studies were processed to develop a reconstruction project for a frame multi-storey building. Quantitative estimates of the actual quality indicators of load-bearing building structures were used. A computer-based verification calculation based on the application of a finite element model was performed for the construction of a cinema hall located in the frame building under study. Plots of internal forces in structures are obtained. It is concluded that the object under study is in a working technical condition.

The place of rescue activities is considered, as well as the scheme for exchanging messages with services in the event of a fire. The features of preparation for localization of fires by fire departments are outlined. The organization of fire suppression by personnel prior to the arrival of fire departments is considered. As an object of protection, the object of mass stay of people is considered on the example of the cinema and concert hall "October" in Lipetsk. The calculation of the required number of forces and means for extinguishing a fire on the roof of the protected object was carried out. Schemes have been developed for deploying forces and means for extinguishing the roof and deploying to extinguish a fire on the roof of the facility. The substantiation of the application of the main fire safety systems for the object of mass stay of people is carried out. Improvement and substantiation of fire extinguishing measures using water fire extinguishing systems was carried out. A schematic diagram of the internal fire-fighting water supply of the object of protection has been developed. Substantiation and application of photoluminescent evacuation systems is carried out. It is proposed to propose to install the main elements of fire extinguishing systems, which will ensure the response time of the main forces and means for the elimination of emergencies, as well as coordinate the main measures for the evacuation of the affected population from this facility.