|
|
Analysis of aviation accidents caused by incorrect maintenance
Ježek, Martin ; Weis, Martin (referee) ; Koštial, Rostislav (advisor)
This bachelor´s thesis covers the aviation accidents caused by incorrect maintenance. It is especially dedicated to the most common human errors and conditions, that can act as precursors to incidents and accidents. The thesis consists of three parts. The first part summarizes the basic statistics of accidents. The next part analyzes the most common causes of accidents due to bad maintenance and methods, that could be used to reduce them. In the last part, there are selected accidents caused by incorrect maintenance focusing on the reformation leading to safer flights.
|
|
|
Evaluation of advantages and disadvantages of aircraft automatic systems
Vrána, Michal ; Koštial, Rostislav (referee) ; Horpatzká, Michaela (advisor)
This bachelor’s thesis deals with civil airplane automatic systems. The first part analyses historical development of flight control systems and automatic system together with philosophy, which is implemented in modern airliners. In the next part, we evaluate advantages and disadvantages together with list and description of modern avionic systems, which participate on automatic flight. In the last part, selected airplane incidents and accidents are analysed, focusing on influence of automation with incidental human factor.
|
|
| |
|
| |
|
| |
|
|
Layout optimisation method for active structural health monitoring
Červenka, Miroslav ; Koštial, Rostislav
This paper describes optimisation method for designing sensoric layout for Active Structural Health Monitoring (A-SHM) by Ultrasonic Guided Waves (UGW) on metal and non-metal (composite) materials. The SHM sensors need to be placed optimally in order to detect structural damage with high probability before the damage turns critical. Configuration of used optimisation algorithm for such task is not straightforward. Differential Evolution (DE) has two configuration parameters – the mutation factor F and the crossover rate CR – whose settings largely influence the solution quality the optimisation process can yield. For that matter we describe an elaborated a method to guide this selection towards good results using visual heat maps with the intent to select best DE’s variant and particular configuration to receive the most optimal SHM sensorics layout.
|
|
|
Integrated method utilizing graph theory and fuzzy logic for safety and reliability assessment of airborne systems
Janhuba, Luboš ; Hlinka, Jiří ; Koštial, Rostislav
This paper presents integrated algorithm for airborne system safety and reliability assessment. In general aviation (mostly up to EASA CS-23) and non-military unmanned aerial vehicles industry, safety and reliability assessment process still relays almost exclusively on human judgment. Recommended practices define processes for system modelling and safety assessing are based on analyst understanding of a particular system. That is difficult and time-consuming process. Commercial computation aids are extremely expensive with restricted (or closed) access to the solution algorithms. Together with this problem, rapid development of modern airborne systems, their increasing complexity, elevates level of interconnection. Therefore, safety and reliability analyses have to continuously evolve and adapt to the extending complexity. Growing expansion brings in the field of unnamed aerial vehicles systems which consist of items without relevant reliability testing. Presented algorithm utilizes graph theory and fuzzy logic in order to develop integrated computerized mean for reliability analysis of sophisticated, highly interconnected airborne systems. Through the usage of graph theory, it is possible to create model of particular systems and its sub-systems in the form of universal data structure. Algorithm is conceived as fuzzy expert system, that emulates decision making of a human expert. That brings opportunity to partially quantify system attributes and criticality. Criticality evaluation increases level of assessment correlation with real state of system and its attributes.
|
|
|
Aircraft leading edges minor damages detection based on thermographic survey of electrical anti-icing system
Koštial, Rostislav ; Janhuba, Luboš ; Hlinka, Jiří
Aircraft leading edge is one of the most important subjects of aircraft scheduled maintenance. Leading edge as part of the slot on transport aircraft is not critical to fatigue stress in most of the cases. However, leading edge is extremely vulnerable to the accidental damage in combination with environmental damage. Maintenance is usually provided by visual inspection before every flight. Nevertheless, development of anti-icing system based on contact electrical heating opens possibility to thermographic Nondestructive Testing (NDT) methods usage. These methods could detect minor damages, which are visually undetectable especially in the case of composite materials. This paper describes possibility of thermographic methods (using anti-icing system) application as mean of leading edge minor damage detection.
|
|
|
High-lift system of the competition model aircraft
Vrba, Martin ; Koštial, Rostislav (referee) ; Koutník, Tomáš (advisor)
This Bachelor thesis is focused on compiling a summary of lift mechanization, at both the leading and the trailing edges used on plane models and unmanned means of transport. It briefly explains their principles and functions. It describes the method of calculation of the flight mode design of the competing aircraft according to the specifications of the Air Cargo Challenge competition.
|
|
|
Methodology of temperature measurement behind jet engine
Koutný, Martin ; Koštial, Rostislav (referee) ; Matějů, Jiří (advisor)
This thesis is focused on temperature measurement behind jet engine. The theoretical part introduces chosen ways of temperature measurement. The practical part is divided into design (and later assembly) of the measuring stand, methodology of measurement and the measurement itself. The main outcome are heat maps gained by measuring temperatures behind TJ – 42 jet engine.
|
guest ::
