Có 60+ tài liệu thuộc chủ đề "bảo trì máy"
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Routine maintenance is the preventive action in maintenance that cares for the operational condition of equipment through inspection, adjustment, recording, monitoring, servicing and lubrication, to ensure that the equipment’s operational functions conform to the required limits of performance.. Evidently, this type of preventive action can only be directed towards the operational condition of equipment.. Thus, the way in which corrective...
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From the three fundamental principles of a maintenance strategy, it is evident that all required maintenance work is made up of one or more types of maintenance that accomplish specific technical benefits. As stated previously, it is the combination of these different types of maintenance that constitutes a maintenance strategy.. From an engineering design perspective, a maintenance strategy is the...
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Failure occurrence in the equipment.. Failure mode of the failed component.. Number of similar parts or components.. Although seemingly problematic from the perspective of complexity, the multiplic- ity of similar parts in each component, with usually a large number of similar com- ponents within each system, is in fact beneficial in characterising the demand for different kinds of spares. Furthermore,...
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However, because of the peculiar nature of these parameters, none are considered in this research, although it is essential to have a complete set of on-system and off-system indices to adequately assess system maintainability and the total mainte- nance burden.. Because BIT is applied within a system’s function, and at the same functioning speed, it affords the capability to detect...
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Operational Time. Time Period × Process Output MDC. Operational time. MDC = maximum dependable capacity. MDC = 1 × (constant representing capacity, C) Process output. Process output = 0 . Process output = 90% of MDC.. It is necessary to consider mean downtime (MDT) compared to the mean time to repair (MTTR). There is frequently confusion between the two and...
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It must be noted that this average output rate is expressed as a percentage of the pos- sible output that can be achieved at maximum design capacity and 100% utilisation.. It is thus an expression of the output capability of the plant as a whole, depending on the percentage capacity for each state of the plant, as a result of...
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Will catastrophic failure be evident in the control room?. Does other equipment need to be removed before access can be gained?. 4.3.1.2 System Performance Analysis and Simulation Modelling. Section 3.3.1.2 considered system performance within the context of designing for availability, which can be perceived as the combination of:. All these characteristics may serve as useful indicators in designing for availabil-...
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4.16 Flowchart of the Monte Carlo simulation pro- cedure (Law et al. The Monte Carlo simulation approach generates statistical estimates of the sys- tem output based on the given distributions of the inputs and error models. More effective sampling techniques such as the Latin hypercube and fractional fac- torial design can be used to reduce the amount of simulations (Hicks...
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Transition t g is pri—under this policy, each time t g is disabled, its age variable a g is reset but its indicator re-sampling variable r g remains equal to 1, and the firing time value γ 1 remains active, so that in the next enabling period an identical firing will result. The same value is maintained over different enabling...
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Returning to the initial quantitative example of designing for availability with the inclusion of preventive maintenance, Fig. 4.24 illustrates the MRSPN representation of the system (Bobbio et al. The generally distributed transition t f models the failure distribution of which the firing results in the system moving to place P down . Upon system failure, the preventive maintenance activity is...
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It is extremely important to examine critically whether the statement of the problem expresses the reality of the problem. Systems configuration: two coal slurry preparation, gasifier and gas cleaner (scrubber) lines in parallel, each with separate oxygen inputs into the gasifier.. (1) A coal plant feeds coal to two coal slurry preparation mills.. Problem definition: determine the reduction in plant...
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Table 4.5 Process capacities per subgroup. Sub-system group No. Each state in the simple power plant example has only one subgroup that is the limiting factor, or bottleneck, for the plant’s power output capability in that state.. The single A subgroup (consisting of two coal bin sub-systems) is wide enough to handle 100% of the flow;. Each of the two...
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Complicatedness is the degree to which any control over the system is able to manage the level of complexity presented by the system. The means of control can be another system or a person. Inevitably, there is a level of complex- ity at which any means of system control simply cannot cope with the system as a whole. The system...
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4.45 Dynamic systems simulation in the blackboard model. To take full advantage of virtual prototyping, it is necessary to develop a mod- elling paradigm that supports model reuse, that is integrated with the design environ- ment, and that provides a simple and intuitive user interface that requires a minimum of analysis expertise, as shown in Fig. General configuration of process...
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4.4 Application Modelling of Availability and Maintainability in Engineering Design 503. Table 4.14 Preliminary design data for simulation model sector 1. Storage bin 1 U . Storage bin 2 U . Storage bin 3 U . a) Evaluation of Simulation Model Sector 1. A major characteristic of the process flow diagram (PFD) of sector 1 is that it depicts material...
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Table 4.18 Comparative analysis of preliminary design data and simulation output data for simu- lation model sector 2. e) Evaluation of Simulation Model Sector 3. A major characteristic of the process flow diagram (PFD) of sector 3 is that it depicts continuous fluid flow and indicates how inputs are transformed by each assembly into outputs that, in turn, become modified...
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Consider the application and significance of systems engineering in engineering design.. Briefly discuss complexity in engineering design and its significance in systems engineering.. Give a brief account of the functions of systems engineering analysis.. Consider effectiveness measures in systems engineering and their significance in engineering design.. Give a brief account of evaluating complexity in engineering design.. Describe various system state...
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534 5 Safety and Risk in Engineering Design whom died within weeks from radiation exposure. It is estimated that at least 5% of the total radioactive material in the Chernobyl-4 reactor core was released from the plant, due to the lack of any containment structure. About 800 cases of thyroid cancer in children have been linked to the accident. An...
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Fault tree. Fault tree Yes. 1999) have emerged to reconcile deficiencies in the tree-based analysis techniques.. DA is an extension of the technique to system control hardware. Deviation analysis determines whether hazardous systems behaviour can result from a class of input deviations inclusive in the broad range of process characteristics such as ca- pacity, input, throughput, output and quality. Hazardous...
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In the following Figs. 5.6 and 5.7, a graphic example is given of a potential outage in a power generation unit due to root cause failure in the boiler feed water pump, expanded to the potential root cause areas of equipment design, manufacture and maintenance. Figure 5.8 gives a layout of the factor tree for the origin of design criteria.....