Có 20+ tài liệu thuộc chủ đề "cấu trúc chế tạo máy"
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equivalent maintainability measures downtime and outage 403 equivalent mean time to outage 405 equivalent mean time to restore 406, 407 equivalent operational time 401 ergonomics 304. error back propagation 709 error-prone automation feature 535 establishment costs 319. estimated degree of safety 653 estimating failure rate 198 estimation 502. event tree. event tree analysis (ETA evolutionary algorithm (EA evolutionary computing 681....
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Maintainability and Safety in Engineering Design. Availability, Maintainability and Safety in Engineering Design. Handbook of reliability, availability, maintainability and safety in engineering design. Apart from any fair dealing for the purposes of research or private study, or criticism or review, as per- mitted under the Copyright, Designs and Patents Act 1988, this publication may only be reproduced, stored or transmitted,...
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5 Safety and Risk in Engineering Design. 5.2 Theoretical Overview of Safety and Risk in Engineering Design. 5.2.2 Theoretical Overview of Safety and Risk Prediction in Conceptual Design. 5.2.3 Theoretical Overview of Safety and Risk Assessment in Preliminary Design. 5.2.4 Theoretical Overview of Safety and Risk Evaluation in Detail Design. 5.3 Analytic Development of Safety and Risk in Engineering Design....
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3.27 Total downtime of the environmental plant critical systems. 4.3 Distribution of the tokens in the reachable markings. 4.9 Unavailable sub-systems and flow capacities per sub-system group. 4.10 Unavailable sub-systems and flow capacities per sub-system group: final summary. 4.12 Probability of incidence of unavailable systems and flow capacities. 480 4.14 Preliminary design data for simulation model sector 1. 4.15 Comparative...
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following models have been developed, each for a specific purpose and with spe- cific expected results, either to validate the developed theory on engineering design integrity or to evaluate and verify the design integrity of critical combinations and complex integrations of systems and equipment.. RAMS analysis modelling This was applied to validate the developed theory on the determination of the...
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Designing for maintainability, as it is applied to an item of equipment, includes the aspects of testability, repairability and inter-changeability of an assembly’s inherent components. Thus, besides providing for visibility, accessibility, testability, repairability and inter-changeability, designing for maintainability also incorporates an assessment of expected performance in terms of the measure of MTTR in relation to the per- formance capabilities of...
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The blackboard can be seen as a global database, or working memory in which distinct representations of knowledge and intermediate results are integrated uniformly.. Finally, it can be seen as a common display, review, and performance evaluation area. It may be structured so as to represent different levels of abstraction and also distinct and/or overlapping phases in the design process....
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Reliability and Performance in Engineering Design. Abstract This chapter considers in detail the concepts of reliability and performance in engineering design, as well as the various criteria essential to designing for re- liability. Reliability in engineering design may be considered from the points of view of whether a design has inherently obtained certain attributes of functionality, brought about by the...
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3.6 Power train system reliability of a haul truck (Komatsu Corp., Japan). 3.7 Power train system diagram of a haul truck. 99995 Transmission sub-system reliability. 99950 Power train system reliability. components are considered to have the same reliability of 0.99999. The reliability calculations are given in Table 3.2.. The series formula of reliability implies that the reliability of a group...
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A typical recurring cost would be the construction, fabrication or installation costs for the system during its construction/installation phase.. Estimating non-recurring costs In making cost estimates for non-recurring costs such as the engineering design of a system from its conceptual design through to final detail design, inclusive of first costs and risk costs, the project manager may assign the task...
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the reliability of relatively simple systems with series and parallel assemblies, to estimations of the reliability of multi-state systems with random failure occurrences and repair times (i.e. Reliability assessment in this context is considered during the preliminary or schematic design phase of the engineering design process, with an estimation of the probability that items of equipment will perform their intended...
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Table 3.7 Failure mode effect severity classifications. 1 Catastrophic The occurrence of failure may result in death or equipment loss. A 2 Critical The occurrence of failure may result in severe injury. B 3 Marginal The occurrence of failure may result in minor injury. C 4 Minor The failure is not serious enough to lead to injury. 1 I Frequent...
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The last part of the curve, the increasing hazard rate region, is designated the. ‘wear-out phase’ of the equipment. In the calculations for reliability, it is important to note that reliability is an indirect function of the probability of the occurrence of failure.. The probability of the occurrence of failure is given by the failure distribution, or failure probability (FP)...
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α 0 = the total number of items put on test at time t = 0, α S = the number of items surviving at time t or at t + Δt.. A more common notation for the ith component reliability is expressed in terms of the mathematical constant e. The mathematical constant e is the unique real number, such...
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This constitutes an analysis of the rows of the matrix, in which. This constitutes an analysis of the columns of the matrix, in which. where m is the number of performance parameters, n is the number of design alternatives, and OPI lies in the range 0–100 and can thus be indicated as a per- centage value.. 3.3.1.5 Labelled Interval Calculus....
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all-parts only flow 2 . With the labelled interval of displacement between 0 . 5 × 10 −3 and 6 × 10 −3 cu- bic metre per revolution and the labelled interval of RPM in the interval of 75 to 150 RPM, the pumps can produce flows only in the interval of 2 . The elimination condition is true in...
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The overall performance index, OPI, can be calculated as. The overall performance index, OPI, is a combination of the parameter perfor- mance index, PPI, and the system performance index, SPI, and indicates the over- all performance of the operational parameters (PPI), and the overall contribution of the system’s items on the system (SPI) itself.. However, as the main use of...
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presence of non-linear properties (for example, in the modelling of performance characteristics of relief valves, non-return valves, end stops, etc.).. In engineering design, and in particular in the FMEA, it is common not to know the precise values of quantities, especially in the early design stages. It would thus be more intuitive to be able to relate design criteria in...
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These modifiers change the shape of a fuzzy set using mathematical operations on each point of the set. In the above table, the variable y represents each member- ship value in the fuzzy set, and A represents the entire fuzzy set (i.e. When a modifier is used in descriptive expressions, it can be used in upper or lower case (i.e....
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In traditional propositional logic, there are two very important inference rules as- sociated with implication and proposition, specifically the inferences modus ponens and modus tollens.. Modus ponens:. Premise 1: ‘x is A’;. Premise 2: ‘IF x is A THEN y is B’;. Consequence: ‘y is B’.. Modus ponens is associated with the implication ‘A implies B’. In terms of propo-...