Có 100+ tài liệu thuộc chủ đề "thiết kế cơ khí"
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Decision trees provide a more formal structure in which decisions and chance events are linked from left to right in the order they would occur. Probabilities of the likelihood of failure events are added to each node in the tree. Such sensitivity analysis is best conducted with the aid of specialised application software such as @RISK c , in which...
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5.49 Detail design model of the scrubber in the layout of a gas cleaning plant. structural and geometric feature of the design. A schematic design model of the gas cleaning plant is graphically illustrated in Fig. After evaluation of the design variables and constraints describing the structural and geometric feature of the design, a detail design model is prepared. In...
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sign variables also adds difficulty to the problem. A numerical scheme is therefore required that produces integer values for these variables, since it will not be appropriate to utilise a method where real numbers are rounded to the nearest whole number. Expected maintenance downtime, for example, can be represented by an explicit function of the design pa- rameters. however, the...
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Ex- amining the artificial neural network itself only shows meaningless numeric values.. The ANN model is fundamentally a black box. Artificial neural net- works have the ability to account for any functional dependency by discovering (i.e.. learning and then modelling) the nature of the dependency without needing to be prompted. The process goes straight from the data to the model...
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The problem is that the fuzzy sets F i and H i are both defined by their membership functions μ , with domain R, the set of real numbers, the input vectors of the training set having infinite elements.. Furthermore, the range of the membership functions are con- tained to the interval [0, 1]. 5.67, draw a semicircle in the...
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One neurode is present in the output layer for each category specified by the user. 5.4, an artificial intelligence-based blackboard model is used to hold shared information in a general and simple model that allows for the representa- tion of a variety of modelled system behaviours. The AIB blackboard system is prescribed for problem-solving in knowledge-intensive domains that require large....
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The simple parallel arrangement of the four blocks 1, 2, 3 and 4 in Fig. 5.88, with a vote number (number of available paths required for success) of 2, would result in the truth table given in Table 5.27.. Figure 5.89 illustrates the use of the fault-tree diagram in determining potential system failures in a parallel control valve configuration of...
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744 5 Safety and Risk in Engineering Design. A typical design problem that is ideal for ANN mod- elling is the formulation and evaluation of stream surge pressures in continuous flow processes, given in the simulation option of the AIB blackboard as illustrated in Fig. The NeuralExpert c (NeuroDimension 2001) program, imbedded in the AIB blackboard, asks specific questions and...
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754 5 Safety and Risk in Engineering Design. The knowledge base consists of facts and functions relating to all the techni- cal data pertaining to process definition, systems definition, performance assess- ment and analysis, conditions and constraints relating to equipment failure modes and effects, the level of risk and mitigating maintenance procedures, as well as an assessment of the required...
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764 5 Safety and Risk in Engineering Design. Figure 5.119 illustrates the ‘questions’ option tab of the imbedded ExSys c Ex- pert System (ExSys 2000). In the illustration, one question relates to temperature, which refers to the expert system goal and is a design criteria constraint. Another question relates to a pressure constraint, where both constraints need to be consid-...
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Plant analysis in the AIB blackboard is the working memory of the knowledge- based expert systems, consisting of a global database of facts relating to the integrity of engineering design, which are used for establishing automated continual design reviews. Deterministic knowledge, in engineering design integrity formulation, is based on a well-defined systems structure and definition of the operational and physical...
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The conditions description set d i9 can be represented by the set of input vari- ables IV 9. The conditions failure output variable set d o7 can be represented by the set of output variables OV 7. This knowledge source makes use of the six global data object inputs d i1 , d i2 , d i3 , d i4...
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In: Proc Reliability and Maintainability Symp, Philadelphia, PA, pp 76–83. In: Proc Int Conf Evolutionary Computation. Ben Brahim S, Smith A, Bidanda B (1992) Estimating product performance and quality from design parameters via neural networks. In: Proc IIE Research Conf, pp 319–323. In: Proc Annu Relia- bility and Maintainability Symp, pp 1–34. IEEE Trans Com- puters 35(8). Chryssolouris G, Lee...
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The capital and operating cost estimates will be developed into a format to be agreed by the owner. The estimates will be developed to an accuracy of ± 10%.. Development of the Project Schedule. The master schedule will be developed for the project.. The format and level of detail to be included is to be agreed by the owner.. The...
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8596Ch01Frame Page -1 Tuesday, November PM. Manufacturing Systems and Their Design Principles. Adjustments in Modern Manufacturing Systems 1.4 Critical Role of Computers in Modern. 1.5 Design Principles of Modern Manufacturing Systems. Product Design and Design for Manufacturability • Process Planning and System Design of Manufacturing Systems • Software/Hardware Architecture and Communications in Manufacturing Systems • Monitoring and Control of Manufacturing...
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Computer-Aided Process Planning for Machining. 2.2 What Is Computer-Aided Process Planning (CAPP)?. This chapter presents an overview of the research work in computer-aided process planning (CAPP) during the past 2 decades. Commercial viability of computer-based tools has occurred at either end of the product life cycle, i.e., in product design and in manufacturing. Practically, these increases are yet to be...
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at the end of the line, it becomes a finished product. The state of the manufacturing system is one of a finite set of states, rather than a collection of continuous variables. whereas, the continuous model of the gripper would contain position, velocity, and force variables to indicate how wide the gripper is open, how fast it is moving, and...
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Machine Tool Dynamics and Vibrations. The accuracy is evaluated by measuring the discrepancy between the desired part dimensions identified on a part drawing and the actual part achieved after machining operations. In general, the table is connected to the nut, and the nut houses a lead screw. The operator controls the motion of the machine from an operator panel of...
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and (2) process optimi- zation, for the purpose of improving the quality of the part or reducing operation time based on feedback from the process.. Expected values of measurements are either determined according to an analytical model of the process 1 or established empirically. 5.2.1 Tool Wear Estimation. Flank wear directly influences the size and quality of the surface. 3...
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In this chapter, we present techniques for monitoring and controlling the process phenomena that arise due to the interaction of the cutting tool and the workpiece (e.g., force generation, chatter, tool failure, chip formation).. Process monitoring is the manipulation of sensor measurements (e.g., force, vision, temperature) to determine the state of the processes. Sensor measurements of the process are then...