Reliability a 2-way linear consecutively connected system with multistate components

A 2-way linear consecutively-connected system with multistate components (2-way LCCSMC) consists of linearly ordered components e_i, iε[0,n+1]. e₀, can send a signal only in forward direction, each e_i, iε[1,n], is capable to send it in both directions, e_n+1, can send it only in backward direction. All components are capable to receive a signal.The component e_i is in state (h,k), hε[0,i], kε[0,n+1−i], iε[0,n+1], if it sends a signal directly to h components immediately preceding e_i and k components immediately following e_i. e₀ and e_n+1 can only be in states (0,·) and (·,0), respectively. The probability that e_i is in state (h,k) is assumed to be known for each admissible h and k. The states of all components are mutually s-independent. The 2-way LCCSMC is operating iff a signal is transmitted forward, from e₀ to e_n+1, and backward, from e_n+1 to e₀, possibly indirectly via intermediate components e₁, … ,e_n. The paper gives an algorithm for determining the 2-way LCCSMC reliability.     

Reliability theory for multistate systems with multistate components

An important problem in reliability theory is to determine the reliability of a complex system given the reliabilities of its components. In real life the system and its components are capable of being in a whole range of states, varying from a perfect functioning state to states related to various levels of performance degradation to complete failure. Thus, the binary models are an oversimplification of the actual reality. This paper presents models and their applications in terms of reliability analysis to situations where the system can have whole range of states and all its components can also have whole range of multiple states. The system generally has various levels of operational performance and hence the total system effectiveness measures should reflect all of these performance levels and their reliabilities. The methodology presented is illustrated by a simple example.     

Reliability evaluation for tree-structured systems with multistate components

A tree-structured system with multistate components consists of a certain number of components which are arranged in a tree structure and are capable of receiving and sending a signal. The signal source is located in the root node, the components located in the leaf nodes can only receive a signal. Each component located in neither a root nor a leaf node is capable of transmitting the received signal directly to a number of components located below it, where this transmission is possible only along arcs linking the nodes, in the direction from upper to lower nodes. A component x is considered to be failed if it cannot transmit a signal to any other component, otherwise it is in the working condition and its state is determined by a set of components receiving a signal directly from x. The whole system is in working condition if each leaf node (which is assumed to be always in working condition) receives the signal from the root node.     

Reliability evaluation of a communication system considering a multistate model

The methods most often suggested for reliability evaluation of communication systems/flow networks consider two states, namely the good state and the bad state. This paper considers multistate modelling of the network elements. The states which permit a flow less than the maximum assigned capacity are assumed as parallel and mutually exclusive elements in the network. A method is proposed for reliability evaluation of a communication network considering multistate modelling of the network elements. The proposed method has been implemented on a computer and results obtained using the proposed method are compared with the existing methods for the two state model conditions.     

Reliability analysis of a multicomponent system in a multistate Markovian environment

Consider a system which operates in a randomly changing environment. The changes of environmental levels are described by a Markov process with finite states. The system consists of several units and one repair facility, the repair time of a failed unit has an arbitrary distribution. We obtain the system reliability functions, availabilities and failure frequencies.     

Reliability of circular consecutively-connected systems withmultistate components

A circular consecutively-connected system with multistate components (CCCSMC) consists of a set of a components e_i, i∈[1,n] arranged in a circle. The e_i is followed by e _i+1, i∈[1,n-1]; e_n is followed by e₁ . The e_i can be in 1 of the states 0,…,k_i . If e_i is in state k∈[0,k_i], then its range is k (the k components following e_i are within its range). The system is functioning if and only if, for every component e _j, j∈[1,n] there is an e_i such that e_j is within the range of e_i. The paper gives a recursive algorithm for determining the CCCSMC reliability     

Reliability analysis of a multistate one-unit repairable system operating under a changing environment

This paper studies a multistate repairable system operating under changing environment subject to a Markov process with two states. Failure rates are constant while the repair rates are general. Regenerative technique in MRP is applied to obtain several reliability characteristics of interest to system designers.     

Analysis of a degraded multistate system with general repair-time distributions

The system in this paper has good, degraded and (N?1)-failed states. Laplace transforms of state probability for such a system are obtained by using the supplementary variable method. A particular case is considered.     

A multistate system with two repair distributions

This paper investigates the mathematical model of a reparable system with three possible states—normal, degraded and failed. We consider two types of repair facilities—overhaul and minor repair—having arbitrary pdf. Other transitions have constant rates.     

光机电一体化产品的可靠性预计

介绍了某个光机电一体化产品的可靠性预计工作，是实践中的一种尝试，并提出了几点看法。     

Pigeon: a wireless two-way messaging system

Wireless messaging is an integral component of universal personal communication services (PCSs). Its growth is likely to be further fueled by the availability of new data capabilities in the new PCS air interfaces. Our research focuses on high-level issues such as new messaging functionalities, high-layer protocols, and overall system design. Pigeon is our proposal of a wireless two-way messaging system. The novelty of our system lies in: (1) the techniques used in mitigating the wireless media and end device constraints, (2) the functionalities provided, and (3) its modular architecture. Examples of (1) include the use of asymmetric protocols and the introduction of user agents. Examples of (2) include group addressing, transaction support, and flexible messages. The modularity of Pigeon allows its individual components to be adopted by specific systems, A prototype of Pigeon has been implemented, and is operational at Bell Laboratories. We describe the motivation, design, and functionality of Pigeon. We also present, as an example, a mapping of Pigeon to a standard cellular/PCS messaging system     

Optimal allocation of multistate elements in a linear consecutively-connected system

A linear consecutively-connected system consists of N+1 linear ordered positions. M s-independent multistate elements with different characteristics are to be allocated to the first N positions. Each element can provide a connection between the position to which it is allocated and the next few positions. The reliability of the connection for any given element depends on: (1) the position to which it is allocated; and (2) the number of positions it connects. The system fails if the first position (source) is not connected with the N+1 position (sink). An algorithm based on the universal generating function method is suggested for the linear consecutively-connected system reliability determination. This algorithm can handle cases in which any number of multistate elements are allocated in the same position while some positions remain empty. In many cases, such uneven allocation provides greater system reliability than the even one. A genetic algorithm is used as an optimization tool to solve the optimal element-allocation problem.     

Reliability evaluation of flow networks considering multistate modelling of network elements

This paper presents a simple method for evaluating the reliability of a multistate flow network. A system is considered reliable only if it successfully transmits at least the required system capacity from the transmitter to the receiver station. All successful states are obtained from the knowledge of the max-flow min-cuts of the system graph. Examples are solved to demonstrate the applicability of proposed method. It is observed that the method is simple, computationally fast and efficient.     

基于PLC的双路、双向配料系统在济钢的应用

本文阐述了基于PLC的双路、双向配料系统的组成及原理分析,并简要分析了双路双向配料、皮带秤配合校称的优点。该配料系统实现的各项功能均满足工艺要求,并在生产实践中取得了良好的应用效果。     

一种新型双向光波载波传输系统设计

提出并验证了一种新型的双向多路光载波传输系统,在阐述其原理的基础上构建了一个双通道波分复用传输系统,采用16-QAM-OFDM信号成功地实现了对下行信号强度重调制,并且进行了CATV/RoF/16-QAM-OFDM多路信号双向传输仿真实验。     

Reliability of a standby system with beta-distributed componentlives

The exact distribution of the sum of 2 independent beta variables is presented. It is applied to a standby system with beta-distributed component lives and permits the calculation of its exact reliability when the exact parameters-values are known. It appreciably improves the current approximate method     

A multistate system with several failure modes and cold standby units

This paper presents a multistate system with several failure modes and N stanby units. Repair times are assumed to be general distributions. Laplace transforms of state probability for such a system are obtained by using the supplementary variable method.     

A repairable multistate system with several degraded states and common-cause failures

In this paper, we deal with a system with several degraded states and common-cause failures. Laplace transforms of state probability for such a system are obtained and a particular case is considered.