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  • Mathematical modelling of аero-acoustic, fiber optic complex adaptive control

    In the present article the current state and the main problems of nondestructive control methods of working shovels of turbomachines are considered, scopes of nondestructive control methods in a flowing part of turbomachines are defined. The main control methods are considered; the reasons limiting possibilities of these methods are defined; the geometry of shovels, stream parameters, the main defects are defined; are considered hot and cold start-up; gasdynamic control methods are analysed; acoustic control methods, the systems of scanning of a cut of a nozzle are defined; the analysis of systems capable to exercise control of operability of a flowing part of turbomachines is carried out; the mathematical models describing acoustic processes in a flowing part of turbomachines and a way of their improvement are designated. The current state of works on creation of the methods and control devices aimed at improvement of metrological characteristics and expansion of functionality of an acoustic method of nondestructive control of working shovels of a flowing part of turbomachines on a nozzle cut is analysed. For control of working shovels of a flowing part of turbomachines it is necessary to use informative and reliable parameters in complex structure of their understanding. Defects in working shovels of a flowing part of turbomachines are found in operation at surveys by various devices therefore development of the minimum defect to greatest possible can happen for a short time interval that will lead to an emergency. The existing means of regular control прогар shovels don't come to light because of the depth or a sektornost for the reason that defects of motionless parts is insignificant a little influence vibration characteristics of the engine in general. Whereas defects in mobile parts can be revealed also sensors of vibration.

    Keywords: distributed fiber systems, аero acoustic control, acoustic field, process simulation, recovery

  • Mathematical modeling and restoration of optico-acoustic parameters of an air-gas stream on a turbomachine nozzle cut. Results of modeling

    The present article is devoted to development and a research of the distributed fiber systems of aero acoustic control of parameters of an air-gas stream on a cut of a nozzle of turbomachines. The main emphasis is placed on development and to a research of the distributed fiber systems on the basis of control methods the using multiplexed fiber-optical sensors of control of parameters of an air-gas stream on a cut of a nozzle of the turbomachines using advantages of optical methods of information transfer and the device for his realization. The principles of creation of the complex systems of aero acoustic cartography complemented with methods and measuring instruments of gasdynamic parameters of a stream in a flowing part and on a cut of a nozzle of the turbomachines directed to increase in informational content and level of algorithmization of nondestructive control of a condition of working shovels and providing data acquisition in the conditions of parametrical and structural uncertainty of an air-gas stream as on controlled internal sections of a flowing part, and on output section on a turbomachine cut are defined. Problems of placement of points of control and restoration of spatial distribution of the field of measurements in discrete set of points separately are considered. Restoration of the acoustic field of turbomachines is implemented according to measurements at the exit of WATERS, only using statistical approach. Restoration of the field is presented in the form of continuous functions of spatial coordinates by results of measurement in discrete set of points in the presence of aprioristic information on properties of the measured fields. Statistical approaches for determination of coordinates of sensors and an error of restoration on the example of one model problem of control of the field of the radiation created by the continuous exclusive radiator are used. Results of calculations show that existence of correlation between coefficients of decomposition of the field of radiation on functions, leads to reduction, necessary for achievement of the set accuracy of restoration of number of sensors.

    Keywords: distributed fiber systems, аero acoustic control, acoustic field, process simulation, recovery