Search academic texts

Information × Registration Number 0319U002112, 0118U006580 , R & D reports Title Dynamics and strength shells of revolution popup.stage_title Динаміка та міцність оболонок обертання Head Smetankina Natalia Volodymyrivna, Доктор технічних наук Registration Date 30-07-2019 Organization A. Podgorny's Institute of Mechanical Engeneering Problems of the National Academy of Science of Ukraine popup.description2 Mathematical models and estimation methods have been created for numerical studies of dynamic reactions, oscillations and strength of thin-walled metal elements of launch vehicles - fuel tanks, compartments and fairings in the in the form of shells of revolution at various stages of mission and during discharge and separation. The technique of the structures dynamics is based on three-dimensional finite-element models with the solution of the problem in time by the Wilson finite-difference method. The dynamic stressed and strained state of the honeycomb head fairing of the launch vehicle is investigated. The head fairing design model is represented by the composition of the base material and anisotropic layers. Its characteristics are determined by a special technique. The stresses of the launch vehicle head fairing is significantly less than the critical values, and the maximum radial displacements are significant. It must be taken into account in the estimation of the structure kinematics when it is discharged. When modeling the interstage module, a system of reinforcements in the form of stringers and frames was taken into account. According to the estimation, the maximum level of stresses in the interstage module is localized at the pneumatic pushers brackets, where additional reinforcement of the structure is advisable. The transient vibrations in the elements of the rocket fairing pyrotechnic system are investigated. The model of system presents the main structural elements - the support, the rod, the instrument compartment, and the damping element. The use of a damping element with reduced elastic stiffness characteristics made it possible to significantly reduce the vibration overloads parameters of the instrument compartment casing under pulsed stressing during separation. A new method and practical technologies are proposed to estimation of vibrations of fuel tanks that allow to consider the process at different stages of missions taking into account the variable gravity, the variable filling level, the presence of elements of damping baffles, the mutual influence of wall deformations and sloshing. Different values of overload at different stages of mission are taken into account. Realization - Yangel Yuzhnoye State Design Office. Product Description popup.authors Асайонок Олександр Вікторович Гармаш Наталія Григорівна Гнітько Василь Іванович Гонтаровський Павло Петрович Дегтярьов Кирило Георгієвич Зайцев Борис Пилипович Протасова Тетяна Володимирівна Стрельнікова Олена Олександрівна popup.nrat_date 2020-04-02 Close