Examination of Methods to Separate Gust and Maneuver Load Factors

2016 ◽  
Author(s):  
Linda K. Kliment ◽  
Kamran Rokhsaz
Keyword(s):  
Load Factors ◽  
Maneuver Load

scholarly journals Comparison of the Flight Loads Spectra of Two Business Jets

2014 ◽  
Vol 2014 (6) ◽  
pp. 5-20 ◽  
Author(s):  
Linda K. Kliment ◽  
Kamran Rokhsaz
Keyword(s):  
Combined Loads ◽  
Load Factors ◽  
Turbulence Data ◽  
Flight Loads ◽  
Maneuver Load ◽  
Range Of Values

Abstract Operational flight loads have been analyzed from two business jets, a Global 5000 and a Global Express XRS. It is shown that both airframes were subjected to nearly the same number of ground-air-ground cycles, even though the flight times were much different. Flights have been divided into various phases, and loads and turbulence data have been categorized by altitude bands within each phase. Cumulative occurrences of incremental vertical gust load factors have been compared and shown to be comparable for the two airframes. Maneuver load factors have been shown to spread over a wider range of values for the 5000 in every phase. This has been confirmed through comparison of combined loads with those from a CRJ100 and an ERJ-145XR. Derived gust velocities, obtained from the load factors are presented in the form of exceedance spectra. These results from both aircraft are shown to agree well

scholarly journals Code Calibration of the Eurocodes

2021 ◽  
Vol 11 (12) ◽  
pp. 5474
Author(s):  
Tuomo Poutanen
Keyword(s):  
High Reliability ◽  
High Accuracy ◽  
Variable Load ◽  
Reliability Model ◽  
Safety Factors ◽  
Rounding Errors ◽  
Code Calibration ◽  
Load Factors ◽  
Characteristic Values

This article addresses the process to optimally select safety factors and characteristic values for the Eurocodes. Five amendments to the present codes are proposed: (1) The load factors are fixed, γG = γQ, by making the characteristic load of the variable load changeable, it simplifies the codes and lessens the calculation work. (2) Currently, the characteristic load of the variable load is the same for all variable loads. It creates excess safety and material waste for the variable loads with low variation. This deficiency can be avoided by applying the same amendment as above. (3) Various materials fit with different accuracy in the reliability model. This article explains two options to reduce this difficulty. (4) A method to avoid rounding errors in the safety factors is explained. (5) The current safety factors are usually set by minimizing the reliability indexes regarding the target when the obtained codes include considerable safe and unsafe design cases with the variability ratio (high reliability/low) of about 1.4. The proposed three code models match the target β50 = 3.2 with high accuracy, no unsafe design cases and insignificant safe design cases with the variability ratio 1.07, 1.03 and 1.04.

Reliability Analysis of Prestressed Concrete Bridges in Mexico: Assessment and Live Load Factors Proposal

2021 ◽  
Author(s):  
Rolando Salgado-Estrada ◽  
Sergio A. Zamora-Castro ◽  
Agustín L. Herrera-May ◽  
Yessica A. Sánchez-Moreno ◽  
Yair S. Sánchez-Moreno
Keyword(s):  
Reliability Analysis ◽  
Prestressed Concrete ◽  
Concrete Bridges ◽  
Live Load ◽  
Prestressed Concrete Bridges ◽  
Load Factors

The operational efficiency of passenger aircraft

2006 ◽  
Vol 78 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Donald McLean
Keyword(s):  
Design Methodology ◽  
Operational Efficiency ◽  
Civil Aviation ◽  
Content Type ◽  
Transport Economics ◽  
Load Factors ◽  
Consistent Assessment ◽  
Definition Of ◽  
Passenger Aircraft ◽  
Practical Implications

PurposeTo provide for the use of airlines and other civil aviation organizations a practical definition of operational efficiency and to show how it can be determined.Design/methodology/approachA brief account of air transport economics is used to demonstrate how bom load factors and aircraft utilization need to be considered in assessing operational efficiency. Then other efficiencies are treated briefly before an example is given of how the better of two fictitious aircraft can be chosen for a particular route. A second example involving the calculation of the operational efficiency achieved by an imaginary airline is also given to show that the typical value is lower than might be expected, particularly in view of the relatively high load factors involved.FindingsProvides performance values and economic figures which are typical of current airline operations.Practical implicationsUse of the proposed definition will allow the consistent assessment of the economic performance of airlines.Originality/valueAt present there is no definition of operational efficiency in general use although it is greatly needed by airlines. The definition proposed in this paper is practical and easy to use.

Study of power transformer loading in rural power supply systems

2021 ◽  
Vol 13 (4) ◽  
pp. 282-289
Author(s):  
I. V. Naumov ◽  
D. N. Karamov ◽  
A. N. Tretyakov ◽  
M. A. Yakupova ◽  
E. S. Fedorinovа
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Rural Areas ◽  
Power Transformer ◽  
Electric Energy ◽  
Power Transformers ◽  
Electric Networks ◽  
Load Factors ◽  
Optimal Load ◽  
Supply Systems

The purpose of this study is to study the effect of loading power transformers (PT) in their continuous use on their energy efficiency on a real-life example of existing rural electric networks. It is noted that the vast majority of PT in rural areas have a very low load factor, which leads to an increase in specific losses of electric energy when this is transmitted to various consumers. It is planned to optimize the existing synchronized power supply systems in rural areas by creating new power supply projects in such a way as to integrate existing power sources and ensure the most efficient loading of power transformers for the subsequent transfer of these systems to isolated ones that receive power from distributed generation facilities. As an example, we use data from an electric grid company on loading power transformers in one of the districts of the Irkutsk region. Issues related to the determination of electric energy losses in rural PT at different numerical values of their load factors are considered. A computing device was developed using modern programming tools in the MATLAB system, which has been used to calculate and plot the dependence of power losses in transformers of various capacities on the actual and recommended load factors, as well as the dependence of specific losses during the transit of 1 kVA of power through a power transformer at the actual, recommended and optimal load factors. The analysis of specific losses of electric energy at the actual, recommended and optimal load factors of PT is made. Based on the analysis, the intervals of optimal load factors for different rated power of PT of rural distribution electric networks are proposed. It is noted that to increase the energy efficiency of PT, it is necessary to reduce idling losses by increasing the load of these transformers, which can be achieved by reducing the number of transformers while changing the configuration of 0.38 kV distribution networks.

Estimation of Load Factors of Trains Using Multi-source data for Complex Metro Systems

2021 ◽  
Author(s):  
Hexiang Wu ◽  
Tong Liu ◽  
Chengfan Li ◽  
Weiqin Tong ◽  
Zhenni Feng ◽  
...  
Keyword(s):  
Load Factors ◽  
Source Data ◽  
Metro Systems

scholarly journals PERANAN PEREMPUAN DALAM PEREKONOMIAN KELUARGA DENGAN MEMANFAATKAN SUMBERDAYA PERTANIAN

2011 ◽  
Vol 10 (1) ◽  
pp. 138-153 ◽  
Author(s):  
Yudhy Harini Bertham ◽  
Dwi Wahyuni Ganefianti ◽  
Apri Andani
Keyword(s):  
Family Income ◽  
Descriptive Analysis ◽  
Farming Systems ◽  
Shared Responsibility ◽  
Know How ◽  
Family Economy ◽  
Load Factors ◽  
Total Family Income ◽  
The Family ◽  
Organic Farming Systems

This study aims to find out the reasons women decide to work as a farmer, knowing the understanding of women in the utilization of agricultural resources, and know how big the role of women in the intensification of the family economy. The method to determine the respondent used in this research is census method with numbering 100 persons. Analysis of the data used is descriptive analysis and qualitative analysis of revenue contribution. The results showed that the reasons women choose to work as farmers because of their desire to help their husbands in contributing family income which is driven by the load factors of family burden.  Looking for experiences and shared responsibility are other reasons for women to work in agricultural activities. Their knowledge and understanding of agriculture, women are only know how to grow crops and produce. Stages how sustainable farming, care for the environment with organic farming systems is not yet implemented. This is caused by the lack of knowledge of owmen. Income contribution of women to family incomes is high, with a range of contribution 40% - 59% of total family income. This condition can be a reason for  women to participate in decision-making within the household. So the presence of women within the family becomes more important and appreciated.Key words: Women role, farmer, revenue contibution

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