control quality assurance and fault diagnosis

... tools, equipment and processes, signal interpreting, condition monitoring, fault diagnosis, machine and process control, machine design, process planning, production scheduling and system configuring ... Process Control Statistical process control (SPC) is a technique for improving the quality of processes and products through closely monitoring data collected from those processes and products and ... arms [Pham and Liu, 1999] Predicting the tensile strength of composite laminates [Teti and Caprino, 1994] Controlling a flexible assembly operation [Majors and Richards, 1995] Recognising control...

Ngày tải lên: 25/01/2014, 13:20

... Zhang, X and Norrie, D.H (1999) Holonic Control at the Production and Controller Levels, IMS’99, Leuven, Belgium, Sept 22-24 Zhang, X., Balasubramanian, S and Norrie, D.H (1999) An Intelligent Controller ... cluster controller software-components, the associated DMH, and intermediate information on the order and the related product Each cluster controller is further composed of multilayer control ... considered to be a holonic grouping The controller cluster next created is composed of three holonic parts: collaboration controller (CC), execution controller (EC), and control execution (CE) holon One...

Ngày tải lên: 17/10/2013, 11:15

... • The shop has no control over due-dates, or • The shop has control over due-dates and due-dates are tight, or • The shop has control over due-dates and due-dates are loose, and there is a great ... 1965, Fuzzy sets, Information and Control, vol 8, pp 338-353 For Further Information Jamshidi, M., Vadaiee, N and Ross T J 1993, Fuzzy Logic and Control: Software and Hardware Applications, Prentice-Hall, ... in which fuzzy logic and fuzzy sets have been used, especially in simulation applications Karwowski and Evans [1986], Watanabe [1990], Raoot and Rakshit [1991], and Dweiri and Meier [1996] found...

Ngày tải lên: 19/10/2013, 18:15

... procedures in general, and to retrieve existing designs and foster standardization and variety reduction among parts Works such as Kamarthi et al [1990] and Venugopal and Narendran [1992b] have ... assumes values between zero and one Malave and Ramachandran [1991], Venugopal and Narendran [1992a, 1994] and Chu [1993] simulated the competitive learning model and reported good results on ... operation of three-layer feedforward networks and back-propagation learning rule, the reader is referred to standard works of Wasserman [1989] and McClelland and Rumelhart [1988] The net input, netpi,...

Ngày tải lên: 19/10/2013, 18:15

... Perng and Chang, 1997; Lee and Kim, 1998; and Tseng, 1999) 7.2 Characteristics of Intelligent Design Retrieval There is no doubt that design is one of the most interesting, complicated, and challenging ... integration of case-based reasoning (CBR) and computer-aided design (CAD) techniques (Maher and Balachandran, 1994) A hybrid intelligent design retrieval and packaging system is proposed utilizing ... 30(13):1019-1035 Liao, T.W and K.S Lee, (1994) Integration of a feature-based CAD system and an ART1 neural network model for GT coding and part family forming, Computers and Industrial Engineering,...

Ngày tải lên: 23/10/2013, 16:15

... incur extra handling costs and create problems with production planning and control In the presence of bottleneck machines, the system cannot be decomposed into independent cells, and some intercellular ... selected process routing for part i, and can be any number between and p for part i However, all parts not have the same number of routings and every number between and p cannot be valid for all parts ... number of cells, and MCSc(i, j) is the MCS coefficient between machines i and j in cell c Since the number of cells and the number of machines within the cells are not known beforehand, the search...

Ngày tải lên: 23/10/2013, 16:15

... randomly selected from M-c and M-e and assigned to OPT3 to replace M-a It is then found that M-a is also the current machine used by OPT1, OPT4, OPT5, and OPT2 Among these OPTs, OPT1, OPT4, and ... information (machines, tools, and all the cost indices) is described earlier and the required OPTs and their machine, tool, and TAD alternatives are shown in Table 9.2 and the PRs between the OPTs ... according to the following rule: IF AND AND THE F(X) → F(Y) OPT(i) ∈ F(X) OPT(j) ∈ F(Y) OPT(i) → OPT(j) As a result, both hard and soft PRs are identified The hard and soft PRs are compared pair-wise...

Ngày tải lên: 27/10/2013, 23:15

... locations opE(j) and opL(j) Consider the precedence tree in Figure 8.4 and a given feasible operation sequence [1 5] The earliest and latest possible locations for operations and are determined ... Nee and A.N Poo, Integrated application of expert systems and neural networks for machining operation sequencing, in Neural Networks in Manufacturing and Robotics, Y.C Shin, A.H Abodelmonem and ... machines Sections 8.5 and 8.6 detail ©2001 CRC Press LLC the computational experiments on using both the proposed genetic algorithm and tabu search procedure To compare the quality of solutions...

Ngày tải lên: 27/10/2013, 23:15

... Monitoring and Control In this chapter, we will treat the problems associated with monitoring and control of manufacturing processes but confine ourselves only to product quality monitoring and control ... monitoring and control tasks but, in this chapter, those related to product quality will be highlighted Section 12.2 reviews basic concept methodologies, and procedures of process monitoring and control ... condition, machine process condition, and fault detection and diagnosis, which are not directly related to product quality In contrast, not many studies deal with product quality monitoring This is mainly...

Ngày tải lên: 06/11/2013, 09:15

... manufacturing domain, which covers resource allocation, scheduling, process control, robotic control, and quality control Zhang and Huang [1995] provide a good overview of many manufacturing applications ... slurry to provide stability and density, and binders are added to ensure that the resulting cast is strong enough to be handled This slip is then poured into a plaster mold and stays there for a specified ... variables (the plant temperature and humidity), ten slip property variables, and the cast time are identified as significant factors for determining the cast quality and the cast efficiency These variables...

Ngày tải lên: 06/11/2013, 09:15

... random and inserts it in a random position Displacement mutation selects a substring at random and inserts it in a random position Reciprocal exchange mutation selects two positions at random and ... weight and processing time For given two jobs i and j, there are four basic patterns of ordering relations of them wi Ն wj and pi Ն pj wi Ն wj and pi Ͻ pj wi Ͻ wj and pi Ն pj wi Ͻ wj and pi Ͻ ... simple example of three machines and nine jobs In this example, jobs 2, 3, and are processed by machine 1, jobs and are processed by machine 2, and jobs 1, 4, 5, and are processed by machine ©2001...

Ngày tải lên: 06/11/2013, 09:15

... amplitudes in bands less than ‘1X’ and ‘1X’ A1: the ratio of peak amplitudes in band ‘1X’ and its initial record (in good condition) A2: the ratio of peak amplitudes in bands ‘2X’ and ‘1X’ A3: ... consists of ten objects and can be described using two concepts, namely “d = 0” and “d = 1.” As already mentioned, two conflicts, namely objects x5 and x7, and objects x6 and x8, exist in the data ... following advantages: • Easy to understand • Easy to interpret and analyse • Easy to validate and cross-check 19.5 Application of RClass* to Manufacturing Diagnosis The diagnosis of critical equipment...

Ngày tải lên: 13/12/2013, 01:15

... mean, and plot it against a control chart with three lines If both µ and σ are known, the centerline is µ with lower control limit µ – σ and upper control limit µ +3 σ If CLT n n holds and the ... > µ0 σ0 USL Process quality characteristic, x FIGURE 18.1 In -control and out-of -control scenarios in SPC (From Montgomery, D.C., 1996, Introduction to Statistical Quality Control, 2nd ed p 131 ... µo = and σo = and δ = 0, ±1, ±2, ±3, and ±4 These observations were fed directly to the network and trained by a standard backpropagation algorithm to achieve a desired output between –1 and The...

Ngày tải lên: 13/12/2013, 01:15

... distinct control loops The process control loop “maintains” the controllable variables at the optimal levels, and will involve schemes such as feedback control, feedforward control, and adaptive control ... nature of the relationship between the different controllable and uncontrollable variables and the quality response characteristics, and allow multiple quality response characteristics In particular, ... the quality controller in the quality control loop that “determines” these optimal levels, i.e., performs parameter design The quality controller includes both a model of the product/process quality...

Ngày tải lên: 13/12/2013, 01:15

... produced by end milling Armarego and Deshpande [1989] presented one more milling process geometry model that incorporates cutter runout to predict cutting forces Sutherland and Babin [1985] demonstrated ... surfaces exhibit interrelated characteristics of both random and deterministic components Zhang and Kapoor [1991] demonstrated the effect of random vibrations on surface roughness in the turning ... parameters Step 2: Read the weight matrix W_xh and W_hy, and the bias vector θ_h and θ_y Step 3: Load the input vector X of a testing example Step 4: Calculate and infer the actual output Y (a) Calculate...

Ngày tải lên: 13/12/2013, 01:15

... < ∨ ( ∧ ( x , w ) ) then ∆ = w if x s < w sj and x s ≥ ∨ ∧ x i , w ij s if x s < w sj and x s s i≠ s if x s ≥ w sj and w sj if x s ≥ w sj and w sj and ©2001 CRC Press LLC i≠ s i ij i≠ s i i≠ s ... feasibility of motor power and current sensing for adaptive control and tool condition monitoring has been described [29] Mannan and colleagues recommend using the spindle and feed current measured ... 15.33, and the estimated value of the spindle and feed current, namely, Si and Fi (i = 1, 2, , 6) are outputted Second, the spindle and feed current detected are put into the logarithm, and are...

Ngày tải lên: 13/12/2013, 01:15

... are many commercial monitoring and diagnosis systems available In general, monitoring and diagnosis methods can be divided into two categories: a model-based method and a feature-based method The ... method, and the fuzzy transition method For the faults such as wear and fatigue, the fuzzy transition method takes the effect of time into consideration, and hence, provides more effective and reliable ... on a complete understanding of the process, the sensors, and the sensor signals Use of effective sensors is often the most effective and costeffective way for monitoring and diagnosis Also, signal...

Ngày tải lên: 13/12/2013, 01:15

... concentration and permittivity 13.5 Process Monitoring and Control Due to demands to produce ICs with increased density and complexity, process control is an issue of growing importance Robust process control ... Monitoring and Control Process Diagnosis Summary 13.1 Introduction New knowledge and tools are constantly expanding the range of applications for semiconductor devices, integrated circuits, and electronic ... process control scheme using two backpropagation neural networks: a plant emulator (PE) and a neural controller (NC) This control architecture allows simultaneous training of the emulator and controller...

Ngày tải lên: 13/12/2013, 01:16

... process patterns, and initiate control actions in real-time manufacturing environment 2.5 Quality Control, Quality Assurance, and Fault Diagnosis Quality control and quality assurance aim at identifying ... Networks Quality Control, Quality Assurance, and Fault Diagnosis Quality Control Quality Assurance Comosite Flaw Detection Surface Roughness Inspection Sampling Plan Determination Thomsen and Lung ... Modeling and Design of Manufacturing Systems Modeling, Planning, and Scheduling of Manufacturing Processes Monitoring and Control of Manufacturing Processes Quality Control, Quality Assurance, and Fault...

Ngày tải lên: 25/01/2014, 13:20