Jerzy Manerowski

SUPPORT OF AIRCRAFT TAXIING OPERATIONS ON THE APRON

The paper presents an approach to this type of problem. Was submitted the general approach to construct the model and presented selected aspects of the application AIRS enabling decision making support on minimizing taxiing aircraft at take-off and landing operations. Taxiing operations of aircraft on the apron are the binding part of planning and air traffic control phase including the sequencing of arrivals and departures, planning of air traffic in the immediate vicinity of the airport and issues of passenger traffic in the terminals and ground handling of aircraft. The airport is presented as a model which was implemented in the form of a computer application AIRS. Application AIRS is suported to determine the optimal taxiways on schedule. The procedure for decision support in carrying out the operation of aircraft consists of: data on the types of aircraft, data staging aircraft, data about the time of use of the types of aircraft, technical and organizational parameters of the process taxiing, the structure of the apron to the process of taxiing, routing algorithms of landing aircraft, routing algorithms of taking off aircraft, algorithms for taxiing in other cases.

The Concept of Monitoring Blades of Rotor Machines with the Identification of their Vibration Frequency

Abstract The paper presents the basis of a new method for monitoring the technical condition of rotating blades during their operation. Utilizing the measurement of blade tip instantaneous speed under subsequent sensors, enables direct determination of the blade vibration frequency. The method utilizes a diagnostic model in the form of amplitude amplification W2ij and phase shift φij of a diagnostic signal y(t) resulting from the operation of the blade and the signal from its environment, when the blade tip passes under a cascade of blade tip instantaneous speed sensors. The adopted diagnostic model, indirectly takes into account the current surrounding of a blade without the need to measure it [12, 14]. Evaluation of the blade technical condition in real time and static analysis shall be performed on the basis of the vibration process parameter analysis. The suggested method may play an important role in the diagnostics of rotor machine blades during their operation.

THE TECHNICAL OBJECT RELIABILITY EVALUATION BASED ON THE PARAMETRIC AND MOMENTARY FAILURES

The presented paper concerns with the technical object reliability evaluation based on the parametric and momentary failures during the process of object operating. The real world data observation shows that in the case of high quality technical objects the catastrophic failure events are too rare to the credible evaluation of the object’s reliability. For that reason, the parametric and momentary failures are in the centre of attention in this paper. The set of analysed failures was obtained with the classifiers of the field data provided by the monitoring system (the failure alarms) and the diagnostic system (the functional and technical condition parameters deviation). The changes of the functioning condition potential are used to determine the symptoms of momentary failures and the changes in the potential of the technical condition to determine the symptoms of parametric failures (non-total). The assumed reliability characteristics model has the form R(t) = f(_, Rb(t), Rc(t)), (where: Rb(t) and Rc(t) – the estimators of reliability for parametric and momentary failures, symbol ‘_’ denotes catastrophic failures not covered). For the identification of R (t) as an analytical function, the estimators are computed with the field data. The Weibull distribution function due to its flexibility is often used. Such is the case in this paper. Two parameters a and b known as the scale and the shape parameters are estimated with the computerized procedure realizing least-square method. The presented examples show good fit quality even for small set of data.