characteristic of centrifugal pump with load with and without vfd

... weight of O and the natural frequencies of vibration of the dynamic system comprising O, P, and C are measured and processed using a mathematical model of the system to determine xG, yG, and γ ... 0.8, and 1.0 are the grades of membership to the given fuzzy set of temperature ranges below 10°C (above 30°C), between 10°C and 16°C (24°C to 30°C), between 16°C and 18°C (22°C to 24°C), and ... set of examples Each example is characterised by the values of a number of attributes and the class to which it belongs In one approach to inductive learning, through a process of “dividing and...

Ngày tải lên: 25/01/2014, 13:20

... 1998), and Agent-Based Manufacturing Scheduling (Shen and Norrie 1998) An overview of these projects with a summary of techniques and mechanisms developed during these projects and a discussion of ... the agents a4 and a5 share the same cluster with the degree of occurrence 0.25, whereas a2 and a5 share the same cluster with the degree of 0.7 We have chosen a set of partitions and corresponding ... these characteristics can be observed in biological and social systems The stability of holons and holarchies stems from holons being self-reliant units, which have a degree of independence and handle...

Ngày tải lên: 17/10/2013, 11:15

... importance of i and j Between equal and weak importance of i over j Weak importance of i over j Between weak and strong importance of i over j Strong importance of i over j Between strong and demonstrated ... capacity of queue j NIQj = number of jobs in queue j  if workstation j is idle SR j =  1 if workstation j is busy Assume two queues, say q1 with jobs and q2 with jobs, with capacity of 10 and 15 ... utilization level of workstation j For example, if the utilization of workstation is 60% and that of workstation is 78%, then µ4(1) and µ4(2) are 0.4 and 0.22, respectively This shows preference of q1 to...

Ngày tải lên: 19/10/2013, 18:15

... Elements of GT/CM (From Suresh, N.C and Kay, J.M (Eds.), 1998, Group Technology and Cellular Manufacturing: State -of- the-Art Synthesis of Research and Practice, Kluwer Academic Publishers, Boston With ... on the basic 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 ... procedure consists of three phases: (1) formation of feature families, (2) identification of machine resources (cells), and (3) determination of a set of features required The number of neurons in...

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 ... part/machine classification and coding can be found in Part B of Group Technology and Cellular Manufacturing: State -of- the-Art Synthesis of Research and Practice, edited by Nallan C Suresh and John M Kay ... process of generating a description of a set of methods that satisfy all requirements Generally speaking, a design process model consists of the following four major activities: analysis of a problem,...

Ngày tải lên: 23/10/2013, 16:15

... number of machines in each cell, C is the 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 ... 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 ... such as minimum and/ or maximum cell size, minimum and/ or maximum number of cells, and maximum number of each machine type In design optimization, there are many design objectives with regard to...

Ngày tải lên: 23/10/2013, 16:15

... order of these OPTs in string-2 Copy the left side of string-2 to form the left side of offspring-2 The right side of offspring-2 is constructed by the OPTs in the right side of string-2 and their ... cut point Copy the left side of string-1 to form the left side of offspring-1 The right side of offspring-1 is constructed by the OPTs in the right side of string-1 and their sequence is reorganized ... Output: string-1 and string-2 offspring-1 and offspring-2 Determine a cut point randomly from all the positions of a string Each string is divided into two parts, the left side and the right side,...

Ngày tải lên: 27/10/2013, 23:15

... seeds (two) ended up with a cycle time of 5410 and the worst seed (one) with 5660 For the runs with 200 and 400 iterations, the best seeds (seven) ended with a cycle time of 5410 Although the ... run with two different population sizes of 50 and 100, respectively The results with different mutation and crossover parameters are shown in Figure 8.18(b) Seven out of eight runs ended with ... quality of the proposed tabu search, a random problem generator is needed to produce a set of representative test problems The design of such a random problem generator and a comparison of the...

Ngày tải lên: 27/10/2013, 23:15

... variance of torque, x4 = mean of torque in retraction stroke, x5 = mean of thrust force, x6 = covariance of torque and force, x7 = correlation of torque and thrust force, x8 = correlation of torque and ... or estimation of the characteristic changes of a manufacturing process based on the evaluation of a process signature without interrupting normal operations In doing so, a series of tasks is performed, ... control and discusses the architecture of the control system and the role of the network within the system Various manufacturing processes including machining, arc welding, semiconductor, and hydroforming...

Ngày tải lên: 06/11/2013, 09:15

... Approximation of the cast rate without considering a mold Moisture content of the cake See slip cake weight The temperature of the slip Source: Lam, S S Y., Petri, K L and Smith, A E., Prediction and Optimization ... hydraulic extrusion pressure Median of media flow rate Range of media temperature Range of part temperature Standard deviation of volume of media extruded Number of parts machined prior to the current ... Number of cycles of the AFM machine piston Media conditions: • Temperature of the media • Temperature of the manifold • Number of parts machined prior to the current part in a work day • Sequence of...

Ngày tải lên: 06/11/2013, 09:15

... automatic options: (i) part loading, (ii) chuck rotation and horizontal movement, (iii) tool magazine rotation and oscillation, and (iv) part loading and unloading Reduction of changeover costs is ... encoding method with a 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 ... tested on randomly generated problems A total of 14 test problems were randomly generated with sizes ranging from 30 jobs and machines to 100 jobs and 20 machines The basic setting of parameters...

Ngày tải lên: 06/11/2013, 09:15

... the ratio of peak amplitudes in bands ‘2X’ and ‘1X’ A3: the ratio of peak amplitudes in bands ‘3X’ and ‘1X’ A4: the ratio of peak amplitudes in bands more than ‘4X’ and ‘1X’ A5: mode of vibration ... condition of the targeted equipment These attributes are defined as follows A0: the ratio of peak amplitudes in bands less than ‘1X’ and ‘1X’ A1: the ratio of peak amplitudes in band ‘1X’ and its ... chromosomes Computation of the fitness of individual chromosome Selection of chromosomes with good fitness Reproduction of next generation of chromosomes/population No Limit on number of generation reached?...

Ngày tải lên: 13/12/2013, 01:15

... the sample mean of x, x, is approximately normal distributed, i.e., N(µ, σ2/n) where µ and σ are the mean and standard deviation of x, respectively, we can collect n observations of a QC, calculate ... 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 ... Performances of Chang and Gan’s (1995) CUSUM and Crowder and Hamilton’s (1992) EWMA are not significantly better than Page’s (1963) CUSUM; however, their development of design strategies and procedures...

Ngày tải lên: 13/12/2013, 01:15

... Equation (17.19) where t denotes time, and the εt’s are iid normal with zero mean and variance of σ ε The value of φ has to be restricted within the open interval of (–1, 1) for the AR(1) process ... possible variants of the basic GA, the fundamental underlying mechanism operates on a population of individuals, is relatively standard, and consists of three operations [Liepins and Hilliard, 1989]: ... on the nature of the relationship between the different controllable and uncontrollable variables and the quality response characteristics, and allow multiple quality response characteristics...

Ngày tải lên: 13/12/2013, 01:15

... combination of cutting parameters: four levels of spindle speed (S = 750, 1000, 1250, and 1500 rpm); four levels of feed rate (F = 6, 12, 18, and 24 in./min); and three levels of depth of cut (D ... 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 the output vector H of hidden ... machined surfaces exhibit interrelated characteristics of both random and deterministic components Zhang and Kapoor [1991] demonstrated the effect of random vibrations on surface roughness in...

Ngày tải lên: 13/12/2013, 01:15

... combination of FS and NN where the output of the FS or NN becomes the input of another NN or FS The models in Figures 15.1(b) and 15.1(c) are referred to as a combination model with net learning and ... constituent part of the AE signal at the frequency band The mean values of the constituent parts of the AE signal of each frequency band can be represented by the energy level of the AE signal ... S and Lindustrom, B., 1989, Monitoring and Adaptive Control of Cutting Process by Means of Motor Power and Current Measurements, Annals of the CIRP, vol 38, no 1, pp 347-350 30 Mannan, M A and...

Ngày tải lên: 13/12/2013, 01:15

... Randomly pick 2/3 of the samples Sequentially pick 1/2 of the samples Sequentially pick 2/3 of the samples All samples The other 1/2 of the samples The other 1/3 of the samples The other 1/2 of ... 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 ... in the frequency band [265–512] Hz The energy of the vibration Vz in the frequency band [64–128] Hz The energy of the vibration Vz in the frequency band [129–264] Hz The energy of the vibration...

Ngày tải lên: 13/12/2013, 01:15

... model of time to failure in electrical and mechanical components and systems When a system is composed of a number of components and failure is due to the most serious of a large number of possible ... cell of the table contains the intersection of the corresponding propositions from m1 and m2 along with the product of their individual beliefs Note that the intersection of any proposition with ... hybrid combination of genetic algorithms and Powell’s method; and (v) a hybrid combination of genetic algorithms and the simplex algorithm The desired output characteristics of the PECVD SiO2...

Ngày tải lên: 13/12/2013, 01:16

... incidence matrix and other manufacturing criteria such as processing time and demand of the parts, FACT could cluster machines and parts with multiple objectives The FACT was tested with 17 examples ... deal with uncertainty and dynamic behavior The ability of neural networks to understand temporal patterns is essential for efficient modeling, planning, and scheduling of manufacturing processes Andersen ... to billet and die material The predictions of both neural networks were very reliable with accuracies of 99% for die fracture and 99% for surface defect, in contrast to 90 and 95% with statistical...

Ngày tải lên: 25/01/2014, 13:20