scholarly journals RELIABILITY OF AIR SEPARATION MODULE COMPONENTS ON THE NITROGEN GENERATION SYSTEM OF BOEING AIRCRAFT

Vortex ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 78
Author(s):  
Wahyu Kurniawan
Keyword(s):  
Failure Rate ◽  
Air Separation ◽  
Aircraft Maintenance ◽  
Original Condition ◽  
Generation System ◽  
Aircraft Systems ◽  
Short Time ◽  
Type Of Failure ◽  
Rate Type

Aircraft is a type of transportation that can reach a certain area in a short time compared to other types of transportation. Every aircraft used will experience a decrease in performance along with the use of flight hours, to maintain and restore the aircraft condition to its original condition, maintenance effectiveness is needed. Aircraft maintenance carried out to keep the aircraft systems or components working properly, one of the components that need maintenance is the Air Separation Module. The purpose of this study to determine the reliability, failure rate, type of failure, and effectiveness of maintenance of the Air Separation Module.

scholarly journals Effect of Grid Instability on Power Generation System's Reliability

2020 ◽  
pp. 27-37
Author(s):  
Joseph Benedict Bassey ◽  
Isaac F. Odesola
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Failure Rate ◽  
System Reliability ◽  
Power Distribution ◽  
Power Plants ◽  
Time To Failure ◽  
Generation System ◽  
Reliability Indices ◽  
Mean Time

Aims: Reliability assessment of power generation system may be performed with the concept of system adequacy, security or both. Grid being a major component in the power distribution chain is seen to have some influence on the state of the generation system reliability because of the perturbation that may arise from it. In this study, the generation system reliability is evaluated using both the system adequacy and security concept. Study Design: To capture the system security problems attributed to grid disturbance, the generation system is structured into two component systems (1 - generation component and 2 - transmission component) with a series arrangement. Methodology: The reliability indices such as, mean time to failure, mean time to repair, failure rate and repair rate are assessed on component bases and with respect to the entire generation system. Results: The effect of failure rate of the transmission component on the entire generation system failure rate was evaluated as 66.25%, 55.55%, 33.33%, 55.00% and 35.72% in year 2013, 2014, 2017 2018 and 2019 respectively for FIPL Power Plant and 52.94%, 82.35%, 61.38% and 100% effect was evaluated in the year 2016, 2017, 2018 and 2019 respectively for GT5 of Omoku Power Plant. Conclusion: These results showed that there is a significant influence of grid disturbances on the reliability state of the two gas turbine power plants in Nigeria. Measures on possible reliability state improvement of the power generation systems were suggested to include training and retraining of technical personnel on the management of major equipment in the generation and transmission stations. 

Evaluation of VDMOS Storage Failure Rate Based on Accelerated Factor

2011 ◽  
Vol 317-319 ◽  
pp. 1149-1152
Author(s):  
Ning Wan ◽  
Chun Sheng Guo ◽  
Shi Wei Feng ◽  
Guang Chen Zhang ◽  
Zhou Zhou
Keyword(s):  
Failure Rate ◽  
Storage Time ◽  
Working Hours ◽  
Test Time ◽  
Rate Test ◽  
Method Of Evaluation ◽  
Short Time

The method of evaluation of VDMOS storage failure rate is presented and explained in this paper. To obtain a large number of devices working hours in a short time, the accelerated factor k is brought into the failure rate test, from which the test time can be reduced to 1/k. In this paper, the failure rate test of VDMOS is carried out at 270 °C about 1500 hours with the accelerator factor k=21.73079. The storage lifetime of VDMOS was calculated over 10 years. The key parameters have been measured and reliability of VDMOS in ten years storage time has been evaluated.

Performance analysis of aircraft fuel tank inerting system with turbocharger

2019 ◽  
Vol 233 (14) ◽  
pp. 5217-5226
Author(s):  
Chaoyue Li ◽  
Shiyu Feng ◽  
Chen Chen ◽  
Xiaotian Peng ◽  
Weihua Liu
Keyword(s):  
Hollow Fiber Membrane ◽  
Fuel Tank ◽  
Air Separation ◽  
Inert Gas ◽  
Generation System ◽  
Gas Generation ◽  
Traditional System ◽  
Aircraft Fuel ◽  
The Mathematical Model ◽  
Inerting System

The onboard inert gas generation system with turbocharger (OBIGGSTC) was proposed for better inerting performance of an aircraft fuel tank. The operating principle and method of the system were introduced, and the mathematical model of the major component was deduced. Then, the characteristic of the system was simulated based on the software AMESim. Compared with the traditional onboard inert gas generation system (OBIGGS), the proposed system has the potential advantages of reducing the weight and volume of the air separation system by decreasing the number of hollow fiber membrane modules (HFMMs) from a maximum number of eight to one at 0.3 MPa of the bleed air from the engine. When both inerting systems have a single HFMM configuration, the OBIGGSTC can substantially reduce the inerting time by 66.6% compared with the OBIGGS at 0.3 MPa of the bleed air. Due to the turbine applied, the mass flow rate of the bleed air of the inerting system with turbine is greater than the traditional system. The compensatory loss of the proposed system is less than the OBIGGS by a maximum of 57.39% when the bleed air pressure varies from 0.3 to 0.8 MPa with a range in flight time from 4 h to 10 h. By analyzing the two inerting system, the OBIGGSTC has better performance than the OBIGGS.

scholarly journals The algorithm of parry failures in the onboard digital computer complexes with the structural and time redundancy

2018 ◽  
Vol 2 (1) ◽  
pp. 22-29
Author(s):  
D. S. Viktorov ◽  
◽  
E. V. Samovolina ◽  
Keyword(s):  
Failure Rate ◽  
High Performance ◽  
Diagnostic Tools ◽  
Structural Redundancy ◽  
Computing Systems ◽  
Energy Characteristics ◽  
Mass Size ◽  
Minimal Mass ◽  
Type Of Failure ◽  
Test Control

Currently, the problem of ensuring reliable operation of onboard digital computing systems is becoming increasingly important. When designing on-Board digital computing systems of spacecraft, it is necessary to provide a combination of a number of indicators: high performance, minimal mass-size and energy characteristics, availability of diagnostic tools and parry the consequences of failures. In addition, one of the main requirements for the onboard digital computing complex of spacecraft is the high total reliability of the system, the minimum time for detection and parry of failures. To improve the reliability of control systems, there are many ways, the main of which is structural redundancy. The use of reservations makes it possible, through the introduction of redundancy, by voting to identify the failed system and exclude it from the configuration. However, in onboard digital computing complexes the failure rate is much lower than the failure rate. This can cause the failure to be perceived by the system as a failure and cause the system to exit the configuration of a healthy channel. By returning the program to the previous recovery point and passing the program fragment again, you can classify the type of failure/failure. Under this approach, the reconfiguration of the system will occur only after unsuccessful attempts to pass a fragment of the program n times (as a rule, the technique is used repeat 7–8 times). The aim of the work is to develop an algorithm for parrying failures in onboard computing systems with three-channel architecture, which involves the complex application of test control and recovery points with different dominance depending on the number of serviceable channels.

scholarly journals Leased Aircraft Maintenance Reserves: Comprehensive Framework to Unsolved Issues under IFRS 16 and Topic 842

2019 ◽  
Vol 14 (11) ◽  
pp. 27
Author(s):  
Francesco Bellandi
Keyword(s):  
Financial Statements ◽  
Aircraft Maintenance ◽  
Original Condition ◽  
The Subject ◽  
The Right ◽  
Comprehensive Framework ◽  
First Time

Aircraft operating lease agreements typically require a lessee to perform certain activities to maintain the leased aircraft and return it to the original condition. Company practice of accounting for maintenance reserves is diverse, challenging and conflicting. The new lease standards often diverge, as FASB, 2019, Topic 842 (U.S. GAAP) rarely, if ever, capitalizes those costs as part of the right-of-use asset, while IASB, 2016, IFRS 16 generally does so. This article builds a comprehensive framework that reconciles IFRS and U.S. GAAP and finally solves issues that the IATA has so far characterized as problematic, but unfortunately academics have failed to adequately address. It also finds out that U.S. GAAP and IFRS may lead to unlike accounting for lease maintenance arrangements of different form but equivalent substance, and that there is an asymmetry between the original asset and the object of capitalization of decommissioning costs. Finally, after a thorough review of financial statements of 53 sampled airlines on the accounting for decommissioning costs and maintenance reserves, for the first time in a public document this article fully reveals the detailed findings and codifies them within an unprecedented precise comparison of U.S. GAAP and IFRS on the subject. Certain inconsistencies in accounting differently for unlike form but like substance are also noted.

Failure Analysis of Axle Sleeve Made from 2Cr13 Steel

2012 ◽  
Vol 591-593 ◽  
pp. 904-907
Author(s):  
De Wei Deng ◽  
Jun Lu ◽  
Xin Tian ◽  
Cui Ping Zhang
Keyword(s):  
Electron Microscopy ◽  
High Frequency ◽  
Rotor Vibration ◽  
Technological Parameters ◽  
Hardness Tester ◽  
Water Pumps ◽  
Short Time ◽  
Type Of Failure ◽  
Scanning Electron ◽  
High Frequency Induction

The 2Cr13 axle sleeve, used in N52 water pumps, suffered wear after being tested for a relatively short time and fractured when it was beat under the dynamic load. Optical metallographic microscopy, scanning electron microscopy (SEM) and Vickers hardness tester for the fractured 2Cr13 axle sleeve were used to determine the most probable causes of the failure. The results showed that the failure was mainly due to the inappropriate technological parameters of high frequency induction heating and a large amplitude rotor vibration. Meantime, cracks were easily found not only close to the frayed surface but also in the inner part contributed to the inappropriate parameters. Finally, the proper protections were advised to be used for preventing this type of failure for the axle sleeve from happening again in the further.

Sign in / Sign up

Export Citation Format

Share Document