# Reliability Analysis of Technical Means of Transport
## 1 Introduction  
The basic components of a logistics system's potential include the technical measures enabling the storage, displacement and handling of cargo units, integrated computer networks and decision-making services managing the physical movement of goods. The individual elements of a logistics system, along with the methods of their utilization and operation, form an infrastructure of logistic processes [1; 2; 3; 4]. Due to the structure of the technical objects, the following infrastructural elements can be distinguished:  
* Linear, understood as a grid of specified strips of land, intended for parking or traffic of means of transport;
* Point, comprising objects intended for the stationary handling of cargo and means of transport;
* Informative, consisting of media, telecommunication lines and measures ensuring data transfer [5; 6; 7; 8; 9]. A logistics system shall also ensure the obtaining of a required level and quality of logistics support and be characterized by appropriate efficiency. The reliability of technical objects, in technical terms, shall be understood as a set of properties determining the readiness of an object and impacting such readiness:  
* Operability--the ability of an object to maintain or restore, under specific operating conditions, a state enabling the execution of required functions;Indestructibility--the ability of an object to function properly and be uninterrupted by failure under specific conditions within a given time interval [10];
* Ensuring the necessary operating measures [11; 12]. The literature often equates reliability, in terms of meaning (and as a measure), to operational readiness. If a given object is composed of multiple subassemblies, then it is important to determine not only its reliability characteristics but also the impact of the reliability of individual subassemblies on the reliability of this specific object. The theory of reliability defines a system as an organized set of objects intended for the execution of specific tasks. The method of system element interconnections, which determines the impact of system failure depending on the failure of individual elements, is called the reliability structure of a system [13; 14; 15]. The objective of this research paper is to define reliability in relation to technical means of transport and to propose an original solution leading to the determination of the expected fitness time of the available vehicle fleet, using the example of a selected military unit (MU). The literature of the subject is often related to the issue of transport system reliability, whereas less focus is placed on the reliability analysis of means of transport, which are the components of the entire system. Therefore, this publication focuses on issues associated with the reliability analysis covering technical means of transport and the determination of further research directions. The most frequently estimated measures of transport system efficiency are:  
* Operational readiness or availability;
* Safety;
* Reliability [16; 17]. A transport process implemented by a transport system is complex and involves a set of activities that enable the execution of a specific transport task. Figure 1 shows the components of a transport system. The reliability of a transport system depends on both its structure and the method of management at the engineering and operation stages. As a result, the analysis of a transport system reliability process shall take into account the possible occurrence of issues associated, among others, with:  
* Possible vehicle unreliability;
* Unreliable infrastructure;
* Lack of information exchange;
* Erroneous operator decisions;
* Random events. Figure 1: Components of a transport process  
The indicated problems may adversely impact the efficiency of the entire transport process. Transport process reliability can be understood as the ability of a system to operate correctly over a planned time period.