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this paper proposed a method to monitor the quality of Fused Deposition Modeling (FDM) products using Statistical Process Control (SPC) based on profile data. Profile data is extracted from product surface image of each layer. Tanimoto similarity between the current profile data and the ideal one is calculated, then used to monitor the manufacturing process. Simulation study is presented to show the...
The development and evolution of complex system usually contains concurrent, iterative and coupling processes. Based on multi-resolution modeling, this paper presents a new approach on modeling and analysis for complex system development and its risk assessment. Firstly, discuss the requirement and function of introducing multi-resolution modeling into complex system research. Define and present the...
Cable layout is an important part in the design of aviation equipment. Most of the cables are set within the narrow space of fuselage, the electrical environment and the spatial structure are complex, however, the traditional design process mainly focus on the physical properties of the cable itself without taking the maintainability especially the accessibility into consideration. In order to solve...
Resource competition, a serious problem in many actual networks, largely influence the network performance and may lead to network congestion. The allocation of link's bandwidth resource is a key process to relieve the situation. Researchers have put forward some strategies to improve the network capacity. They thought that the allocation strategies were determined by the importance of each link which...
In view of the fact that there is no comprehensive evaluation parameter of support equipment allocation efficiency, in this paper, we had a comprehensive consideration of the mean logistic delay time and the annual consumption cost of support equipment, and analyzed and constructed the optimization model of allocation efficiency from the perspective of cost-effectiveness with the constraint of satisfaction...
Because of the phenomenon that various support equipment reduce the security system deployment and economy, this paper analyzed the cost and efficiency of intensive security equipment that made by some similar function equipment. The measurement costs were taken into account in the cost model. To sort out the parameter values of the initial support devices, make them dimensionless, and select parameters...
Phased-mission system (PMS) usually has the characteristic of high complexity and integration and operates under a complex condition, so system reliability plays an important role during its mission. The common cause failure (CCF) in system which can destroy the hypothesis that the failures are independent, especially in the PMS. Based on their impacts on the components, CCFs can be classified into...
determining the failure propagation paths is always an important content of safety analysis. The traditional safety analysis methods are hard to deal with large complex systems. Therefore, model-based safety analysis (MBSA) becomes increasingly popular. However, the existing modeling methodologies are mainly modeled from one of the following three aspects, function, structure and state. This lacking...
This paper considers the up-to-date railway RAMS (Reliability, Availability, Maintainability, and Safety) standards, i.e. EN 5012X series and FprEN 50657, and provides an overview of different definitions and requirements upon non-safety-related software in the context of those standards.
The system configuration is an import aspect of Integrated Modular Avionics systems. These IMA blueprints are configured based on ASSAC and ARINC653 standards by analyzing all the requirements. Application requirements, such as required memory, communication, period, deadline and execution time, are stipulated in the blueprint. Hardware resources are also described in the blueprint. Moreover, the...
The article presents a new method for predicting the reliability of the automobile starter using the AgenaRisk program and experimental research. The program allows to forecast the health status of the starter and provide service intervals of its technical condition. Simulation studies for selected faults in the electrical and mechanical circuits of the starter allowed to carry out an analysis of...
Currently, China has the fastest growing air transportation market in the world. Resilience to external events is critical to ensure an efficient and reliable transportation of passengers. This study investigates the robustness of the Chinese airline network under disruptions at their critical airports as well as the evolution of the networks' robustness from the year 2010 to 2015. Among the 24 Chinese...
Many real-world systems such as multi-processor computing and power transmission systems have load sharing attribute where the whole system workload is distributed to different system elements. In these systems, when one element fails, other remaining elements would take over the workload which will change their failure behavior and cause a dynamic dependence of failure, thus a reliability evaluation...
This paper presents a method to estimate the remaining useful life for degrading systems operating under time-varying operational conditions. This method considers a non-monotone degradation process that is significantly affected by stochastically-evolving operational conditions. The failure zone instead of the deterministic failure threshold is used to identify the failures, and different operational...
A propagated failure from a system component not only causes the component itself to malfunction, but also affects other system components. However, in systems with the functional dependence behavior, the failure propagation from a dependent component could be isolated if the corresponding trigger component fails first; otherwise the failure propagation effect still takes place causing extensive damage...
The engineering ideas of the Taguchi method have been widely recognized but the signal-to-noise ratio (S/N ratio) has drawn much criticism. Response surface methods do not use S/N ratios but it is not easy to build an adequate response surface model. In this paper, we propose a relatively simple method for analyzing the data from Taguchi experiments. The proposed approach directly uses the average...
Existing methods for the reliability and safety analysis of manned spaceflight mostly focus on the equipment failure of manned spaceflight, while there are a large number of man machine interactions which has a great influence on the system reliability and safety during the launching process of manned spaceflight. This paper firstly analyzes the task of manned spaceflight launching process, then based...
The problem which is paid attention in this paper is that existing physics-of-failure model cannot input and calculate complex multi-level stress environmental profile when making simulating calculation of microelectronic devices' using reliability. A physical model for electro-migration failure is analyzed as an example. We make cumulative calculation and improvement using theory of accelerated factor,...
Industrial robots are being widely used attributed to their flexibility, repeatability, and accuracy. The reliability of industrial robots are becoming more highlighted. Over-year evidence clearly indicates that the reliability of industrial robots has had a big improvement, not only by the more reliable hardware design, but also by collecting and analyzing the failure data in fields over a long period...
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