Коливання двовісної автоцистерни з урахуванням ефекту запізнення випадкового збурення

Abstract

У роботі виконується моделювання випадкових коливань напівпричепу автоцистерни при русі по дорогам загального призначення та дорогам з недосконалим покриттям. За допомогою метода скінченних елементів та методів статистичної динаміки визначені ймовірнісні характеристики поведінки системи та знайдені небезпечні точки конструкції при різних варіантах збурення, проведено дослідження впливу ефекту запізнення дії зовнішніх сил.The paper presents the results of modeling of semi-trailers random vibrations of driving on different type of roads. Damage to the tank capable appears during operation due to the accumulation and development of fatigue or corrosion, which leads to cracks and depressurization boiler tank. Therefore, development of methods for modeling settlement tank designs to assess their durability and reliability prediction as the design stage and in operation to ensure safety is important. For solving problem random vibrations of vehicle with the influence of the lag effect the mathematical model was made. Particularly was considered the mathematical model random impacts vector with lag time effect on axis of vehicle. Finite-element model of the boiler semitrailer tanker was developed. The problem of natural vibrations was solved using the FEM, obtained natural frequencies and shapes. The natural frequencies has dense spectrum which are composed from groups of close to the frequencies. These groups are measure up to forms which responsible for local vibrations neighboring breakwaters. The next step was obtained probabilistic behaviors of the system, such as spectral density and standard deviation of displacements and stresses, the influence of the lag effect of external forces using the methods of statistical dynamics. After analysis of spectral density of displacement and stress was determined that in account of time lag spectral density has a lot of bursts, in contrast simultaneous load, which reflect phase shift in load. In paper has been determined that the distribution of the standard deviation at the same time loading and time lag effect is different. The largest amplitude in the first case the edges of the tank and the second in the middle. When analyzing the standard deviation stresses determined that there are dangerous zone near the supports and hatches.