scholarly journals Reliability tests in the operation of military vehicles

2021 ◽  
pp. 7-11
Author(s):  
Kamil PRZYBYSZ
Keyword(s):  
Test Sample ◽  
Reliability Function ◽  
Second Phase ◽  
Military Vehicles ◽  
Logarithmic Distribution ◽  
Military Units ◽  
Operational Data ◽  
Observation Period

Reliability studies in the operation of military vehicles are not carried out extensively. This is due to the guidelines of superiors regarding the keeping of operational records in military units. As a result, this work attempts to determine the reliability of military vehicles. This work includes reliability tests of military vehicles operated in military units in the second phase of operation, i.e. in the operation interval, where the extent of change in the intensity of damage is the least in the function of mileage. The study used a sample of 37 vehicles for which all operational events relevant to reliability determination were recorded during a two-year observation period. Using recorded operational data, an empirical reliability function of the vehicles included in the test sample was determined. Based on reliability tests of the reliability function as a function of mileage to damage, they show that second-phase vehicles used in military units have a logarithmic distribution of reliability as a function of mileage.

scholarly journals A Collaborative Neighbor Representation Based Face Recognition Algorithm

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Zhengming Li ◽  
Qi Zhu ◽  
Binglei Xie ◽  
Jian Cao ◽  
Jin Zhang
Keyword(s):  
Face Recognition ◽  
Linear Combination ◽  
Test Sample ◽  
Reconstruction Error ◽  
Recognition Algorithm ◽  
Second Phase ◽  
Two Phase ◽  
Alternative Scheme ◽  
Training Samples ◽  
Discrimination Information

We propose a new collaborative neighbor representation algorithm for face recognition based on a revised regularized reconstruction error (RRRE), called the two-phase collaborative neighbor representation algorithm (TCNR). Specifically, the RRRE is the division of  l2-norm of reconstruction error of each class into a linear combination of  l2-norm of reconstruction coefficients of each class, which can be used to increase the discrimination information for classification. The algorithm is as follows: in the first phase, the test sample is represented as a linear combination of all the training samples by incorporating the neighbor information into the objective function. In the second phase, we use thekclasses to represent the test sample and calculate the collaborative neighbor representation coefficients. TCNR not only can preserve locality and similarity information of sparse coding but also can eliminate the side effect on the classification decision of the class that is far from the test sample. Moreover, the rationale and alternative scheme of TCNR are given. The experimental results show that TCNR algorithm achieves better performance than seven previous algorithms.

scholarly journals An Analysis of Reliability of Military Vehicles

2019 ◽  
Vol 49 (3) ◽  
pp. 527-546
Author(s):  
Kamil Przybysz ◽  
Sławomir Dygnatowski ◽  
Norbert Grzesik
Keyword(s):  
Process Optimization ◽  
Decision Process ◽  
Reliability Level ◽  
Military Vehicles ◽  
Extensive Analysis ◽  
Peculiar Character ◽  
Military Units ◽  
Exploitation System

Abstract The paper describes issues related to reliability of military vehicles based on recorded operational events. Seeking the quantification of reliability for exploiting vehicles in military units, an extensive analysis of factors shaping the reliability level was made, taking into consideration all phases of military vehicles existence and a peculiar character of the exploitation process of military vehicles. The importance of reliability research in the decision process optimization was emphasized, controlling the efficiency and availability of the exploitation system.

scholarly journals Research On Improving The Maintenance Activities For Military Vehicles

2015 ◽  
Vol 21 (3) ◽  
pp. 896-903
Author(s):  
Ioan Virca ◽  
Viorel Dascălu ◽  
Constantin Grigoraş
Keyword(s):  
Operational Reliability ◽  
Efficient Solutions ◽  
Maintenance Strategies ◽  
Military Equipment ◽  
Maintenance System ◽  
Military Vehicles ◽  
Good Account ◽  
Maintenance Activities ◽  
The Military ◽  
Military Units

Abstract The current maintenance system, preventively planned and applied to the military equipment according to the necessities, involves the rigorous execution of maintenance operations, which results in high costs and volume of work. These causes generally determine the formality of planned repairs and maintenance, with detrimental effects for the availability of vehicles. Moreover, the constructive-functional level of the current technical systems leads to the reorientation of adopting maintenance strategies that correspond to the availability level of the constructive kits to computerized diagnosis operations, such as the maintenance based on operational reliability. For some types of vehicles, the periodical technical inspection, besides allowing for regular traffic on public roads, can offer significant data for the managerial and technical implementation of the maintenance based on operational reliability within the military units. The paper aims at offering viable and efficient solutions for executing maintenance activities and for making vehicles available by turning to good account the data resulting from the technical diagnosis process, correlated with an optimal management of maintenance.

scholarly journals ANÁLISE DA VIABILIDADE DE PRODUÇÃO DE BIODIESEL DE ÓLEO RESIDUAL DE FRITURA NA MARINHA

2012 ◽  
Author(s):  
Aurelio Lamare Soares Murta ◽  
Marcos Aurelio Vasconcelos De Freitas
Keyword(s):  
Rio De Janeiro ◽  
Geographic Location ◽  
Production Costs ◽  
Biofuel Production ◽  
Unit Price ◽  
Metropolitan Region ◽  
Residual Oil ◽  
The Road ◽  
Military Vehicles ◽  
Military Units

Resumo Este trabalho tem por objetivo analisar a possibilidade de produção de biodiesel para uso em veículos de frota cativa em unidades militares da Marinha, a partir do óleo residual de fritura utilizado nas cozinhas das unidades militares. Para tanto, foi realizado um levantamento acerca da disponibilidade de óleo nas principais unidades militares da Região Metropolitana do Rio de Janeiro e modelada uma rede de coleta deste material para encaminhamento a um centro de armazenagem e produção do biocombustível definido pelo próprio estudo. Para tanto foram levados em consideração aspectos de localização geográfica, bem como a malha viária disponível. Foram realizados, também, cálculos de custos de produção do biodiesel e dos insumos industrializados necessários ao processo. Ao final, foi possível calcular o preço final por litro (preço unitário) de biodiesel produzido e a economia resultante deste processo, bem como as possibilidades do uso deste biocombustível numa frota cativa experimental de veículos militares.   Abstract This study aims to examine the possibility of producing biodiesel for use in fleet vehicles captive in military units of the Navy, from the residual oil used for frying in the kitchens of military units. For this, we conducted a survey on the availability of oil in the major military units in the metropolitan region of Rio de Janeiro and modeled a network of collecting this material for referral to a storage center and biofuel production set by the study itself. For both aspects were taken into account geographic location and the road network available. Were performed also calculations of the production costs of biodiesel and industrial inputs needed for the procedure. In the end, it was possible to calculate the final price per liter (unit price) of biodiesel and economy resulting from this process and the possibilities of using this biofuel in a captive fleet of military vehicles.

scholarly journals THE QUANTIFICATION METHOD OF FUNCTIONAL AVAILABILITY MILITARY VEHICLES

2020 ◽  
Author(s):  
Kamil Przybysz
Keyword(s):  
Mathematical Model ◽  
Markov Process ◽  
Accurate Estimation ◽  
Technical Object ◽  
Quantification Method ◽  
Model Based ◽  
Military Vehicles ◽  
Operational Quality ◽  
Operational Data ◽  
Exploitation System

The availability is one of the most important feature of a technical object which shapes its operational quality. The paper undertakes the issue related to the quantification of functional availability of vehicles, with reference to reliability aspects. The conducted exploitation research paved the way for elaborating methods of determining functional availability for vehicles, in particular focusing on reliability. The essential research was conducted using the developed mathematical model based on the probabilistic, stochastic Markov process, which allowed modelling the process of changes in the exploitation states of vehicles. In view of the above, it is essential to develop methods that enable the most accurate estimation of the functional availability of vehicles. Knowing the values of functional availability, we can estimate the probability of performing assigned tasks and precisely control the vehicle exploitation system, especially in terms of availability, which is important for vehicles. This work presents a method for determining the functional availability of vehicles, taking into account the limitations introduced by the vehicle exploitation system.  Particular attention was paid to the possibility of using probabilistic, stochastic semiMarkov models, whose rules and method of creation were generally described, with regard to the ability to acquire operational data in the vehicle exploitation system.

THE RUNNING CAR WITH THE LETTERED REACTIVE POINT IN THE ZONI BEACH CONTACT THE WHEEL ROOM WITH THE SUPPORT SURFACE

2019 ◽  
Vol 1 (12) ◽  
pp. 120-132
Author(s):  
L. Petrov ◽  
A. Skorichenko ◽  
M. Shimonets ◽  
S. Verpivsky
Keyword(s):  
Scientific Work ◽  
Support Surface ◽  
Acceleration Time ◽  
Military Vehicles ◽  
Military Vehicle ◽  
Wheel Drive ◽  
The Military ◽  
Thrust And Torque ◽  
Military Units ◽  
Flexible Member

Conclusion. As a result of the studies of the car with upgraded wheel drive: 1. The patent search of directions of modernization of wheel directions in modernization of wheel drives of the car allowed to identify possible directions of modernization of a wheel drive. 2. To modernize the wheel propulsion, it is proposed to include a movable weight acting on the flexible member in the area of contact and exit area. 3. Conducted experiments at the landfill of NATO NATI revealed the advantage of upgraded wheel propellers over the existing traction by 15-20% 4. Based on the results of the experiments graphical dependencies were constructed: - traction balance of the car; - ways of acceleration of the car; - the acceleration time of the car. 5. The model of the car with modernized wheel motors has been developed. Increasing the patency of military vehicles in difficult conditions close to combat ensures the success of the task. Therefore, the study of the modernization of the wheel drives of a military vehicle and their implementation in military units is an important scientific work. Purpose of the study: improving the patency of the military vehicle, the dynamics of its acceleration and wheel drive efficiency Objectives of the scientific work: is to improve the design of the wheel drive of a military vehicle, determine the parameters of traction balance, path and acceleration time. In the scientific work the researches of the military car with the modernized wheel propulsion, which are all leading, when using the car in difficult conditions close to combat, are carried out. Upgraded wheel drives allow the use of variable thrust and torque realization on the drives. During the work the tensometric laboratory was used for traction tests on the basis of MAZ-543 at the landfill of NAT NATI in Odessa. The main devices are a mobile measuring complex and an electronic dynamometer.

scholarly journals Investigation on the Microstructure and Mechanical Properties of CNTs-AlSi10Mg Composites Fabricated by Selective Laser Melting

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 838
Author(s):  
Shixuan Luo ◽  
Ruifeng Li ◽  
Peiyuan He ◽  
Hangyu Yue ◽  
Jiayang Gu
Keyword(s):  
Mechanical Properties ◽  
Selective Laser Melting ◽  
Load Transfer ◽  
Test Sample ◽  
Second Phase ◽  
Laser Melting ◽  
Fine Grain ◽  
Microstructure And Mechanical Properties ◽  
Milling Method ◽  
Scan Speed

CNT-AlSi10Mg composites fabricated by SLM have drawn a lot attention in structural application due to its excellent strength, elasticity and thermal conductivities. A planetary ball milling method was used to prepare the carbon nanotube (CNT)-AlSi10Mg powders, and the CNT-AlSi10Mg composites were fabricated by selective laser melting (SLM). The density, microstructure and mechanical properties of CNT-AlSi10Mg composites were studied. The density of the test samples increased at first and then decreased with increasing scan speed. When the laser scan speed was 800 mm/s, the test sample exhibited the highest density. The hardness increased by approximately 26%, and the tensile strength increased by approximately 13% compared to those values exhibited by the unreinforced AlSi10Mg. The grains of CNT-AlSi10Mg composite are finer than that in the AlSi10Mg. The CNTs were distributed along the grain boundaries of AlSi10Mg. Some of the CNTs reacted with Al element and transformed into Al4C3 during SLM, while some of the CNTs still maintained their tubular structure. The combination of CNTs and Al4C3 has a significant improvement in mechanical properties of the composites through fine grain strengthening, second phase strengthening, and load transfer strengthening.

scholarly journals Analysis Abnormal Return Eid Al-Fitr on Food and Beverages Company Listed In Indonesia Stock Exchange Year 2013 – 2017

2019 ◽  
Vol 2 (1) ◽  
pp. 79-85
Author(s):  
Ranny Rizky Ananda
Keyword(s):  
Abnormal Return ◽  
Stock Exchange ◽  
Abnormal Returns ◽  
Sampling Technique ◽  
Test Sample ◽  
Significance Level ◽  
Food And Beverages ◽  
Before And After ◽  
Paired T Test ◽  
Observation Period

Efficient market is a price that reflects all the information available, the more efficient the market is very difficult for investors to obtain abnormal return. Abnormal return can happen the event of holiday effectEid Al-Fitr. The purpose of this study was to examine the differences of abnormal returns before and after Eid Al-Fitr and to examine the effect of one week before Eid Al-Fitr and one week after Eid Al-Fitr against abnormal return in Food and Beverages sub sector. the observation period is one week or seven days Eid Al-Fitr and one week or seven days after Eid Al-Fitr for five years (2013-2017). The results of hypothesis testing in this study used the analysis of different test paired t-test sample with SPSS program and 5% significance level (0.05) and by using Multiple Regression Analysis with Eviews program. The sampling technique in this research is purposive sampling to get the sample of 11 companies. The result of the test is obtained (1) there is difference of abnormal return before and after Eid Al-Fitr, (2) the week Eid Al-Fitr has significant effect to abnormal return, (3) a week after Eid Al-Fitr does not affect abnormal return.

scholarly journals Intelligence in Military Missions: Between Theory and Practice

2021 ◽  
pp. 1-20
Author(s):  
Sebastiaan Rietjens
Keyword(s):  
Theory And Practice ◽  
Complex Nature ◽  
Second Phase ◽  
Main Body ◽  
Operational Environment ◽  
Policy Makers ◽  
Strategic Objectives ◽  
Military Organizations ◽  
Military Commanders ◽  
Military Units

AbstractIntelligence is the primary mechanism that military organizations use to generate understanding and its main purpose is to provide information to decision-makers such as commanders that may help illuminate their decision options. This chapter assesses the role of intelligence in military missions, more specifically the counterinsurgency and stabilizations missions that took place in, for example, former Yugoslavia, Iraq, Afghanistan, and Mali.The chapter starts by addressing the changing and increasingly complex nature of many of the conflicts from the 1990s onwards. It explores how this has influenced the use of intelligence and presents two distinct schools of thought. The first school of thought, referred to as Jominian intelligence, tries to unravel the operational environment in a systematic way and regards the intelligence challenges as a series of problems with definite solutions. The second school of thought, referred to as Clausewitzian intelligence, argues that the goal of intelligence is to assess uncertainty and reach a deliberate judgment.The main body of the chapter then analyzes the intelligence process and identifies several of the main intelligence issues within military missions. The intelligence process starts with the direction phase in which policy makers, military commanders, or planners state their needs, often referred to as information requirements. Several issues complicate such direction, including (1) the comprehensive focus of many current military missions, (2) their abstract and ambiguous strategic objectives and expectations, and (3) the military’s unfamiliarity with the area of operations.In the second phase of the intelligence process, the necessary information is collected. In addition to consulting their archives and databases, military units often have a plethora of means, both technical and human, available to collect information. Cross-cultural competencies are of crucial importance, in particular, during the collection phase.The third phase of the intelligence process, labeled processing, turns raw data into intelligence. During the processing phase, the data are analyzed in order to gain understanding or insight. This exceeds the registration of events, but includes understanding the meaning of these events as well as their importance.The fourth and final phase is dissemination of intelligence. Here, the relationship between the producers and consumers of intelligence during military missions is explored. This includes the reasons why consumers sometimes do not fully accept the intelligence they receive.The chapter concludes with an agenda for research on military intelligence. It calls, for example, for a more eclectic author base; multidisciplinary as well as comparative research; increased attention to oversight, ethics, and open source intelligence; and more emphasis on intelligence within the navy, special forces, and constabulary forces.

scholarly journals INŽINJERIJSKE JEDINICE U VOJSCI KRALJEVINE SHS/JUGOSLAVIJE 1918–1941.

2021 ◽  
Vol 39 (2/2021) ◽  
pp. 279-294
Author(s):  
Dalibor Velojić
Keyword(s):  
Interwar Period ◽  
Financial Resources ◽  
Second Phase ◽  
Modern Equipment ◽  
Complex Training ◽  
Two Phases ◽  
Military Units

The formation of engineer units in the Royal Yugoslav Army during the 1920s and 1930s developed in two phases. The first was its engagement within the army divisions and in the second phase was the establishment of a unique engineering command, including pioneer, pontoon, and military traffic commands. Considering their different specialized activities, planned complex training demanded certain financial resources as well as an adequately qualified command staff. The lack of engineering officers and non-commissioned officers was one of the reasons why the recruits did not have regular lectures. Also, whole units were often sent out of their garrisons, especially for the purpose of strengthening the country’s borders, which posed a serious problem, which was not solved during the entire interwar period. Another problem was a small number of recruits, which is why they had to be taken over from other military units, plus the fact that they were mostly technically inexperienced and frequently even illiterate. In addition, modern equipment was scarce, all of which made good quality training impossible.

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