Dynamic interaction between clustered liquid propellant rocket engines under their asynchronous start-ups

Sparsity-Constrained Vector Autoregressive Moving Average Models for Anomaly Detection of Complex Systems with Multisensory Signals

“…The operational conditions of LREs are typically categorized into three stages: the startup phase, the main stage, and the shutdown phase. A majority of studies indicate that during the startup and shutdown phases, the data measured by sensors exhibit highly non-stationary and transient characteristics [35][36][37][38]. Conversely, during the main stage, the engine operates stably, and the sensor measurements are either inherently stationary or can be rendered stationary through normalization, differencing, and similar procedures.…”

Узагальнення Експериментальної Пружності Кавітаційних Каверн У Насосах Ррд, Які Істотно Відрізняються За Розмірами Та Продуктивністю

“…For solving the problems of low-frequency dynamics of LRPS and liquid rockets, the hydrodynamic model of LRE cavitating pumps [1,4,5,[11][12][13][14][15][16] includes elasticity of cavitation caverns B ~1(k*, q), volume V ~C(k*, q), and negative cavitation resistance B ~2(k*, q). These parameters of cavitation flow in pumps may be determined based on the dependencies of the experimental frequencies of cavitation bubble oscillations on pressure at the pump inlet p 1 and flow rate through pump G. According to the definition of elasticity of cavitation bubbles:…”

“…With the help of semi-empirical coefficients obtained in [10], some important problems of low-frequency dynamics of LRPS and liquid rockets have been solved. They include the analysis of stability of longitudinal oscillations and the selection of parameters of dampers of longitudinal oscillations [5], the prediction of amplitudes of longitudinal oscillations while upgrading LVs [11,12 ], the study of the stability of the propulsion system [13], the determination of transi ent processes during the start and stop of the LRPS [4], the study of the influence of staggered start on the parameters of propulsion system launch [14], the influence of external and internal factors on the thrust misalignment at the LRE start [15], the simulation of engine start during fire tests in the throttle mode [16], etc.…”