Part contact states, Mechanical Engineering

Assignment Help:

Part Contact States

The loading, movement and unloading of parts via the manufacturing system should be scheduled through supervisory computer. In contrast along with classical scheduling, one can no longer  suppose  that  the  parts  will  move  to  subsequently  machine  immediately  after  this  has finished processing. Comparatively, the part will wait on the machine till the material handler unloads this. Obviously, no part can be scheduled upon the machine under consideration till the earlier part has been unloaded.

In  order  to  model  this  condition,  this  is  essential  to  explicitly  consider  loading  and unloading activities, additionally to machining activity. Assume Ci and Di signify the load and unload operations related along with the processing operation i. the technological relationships among these operations can be presented via the pairs (Ci, i) and (i, Di). Thus, the set of operations contains 2 | N | additional operations, and all arc set (i, j) ∈ Ak is changed into (Ci, i), (i, Di), (Cj, j), ( j, Dj). The material handling resource V  can  be  modeled  like  the  set,  Sv,  consisting  of  operations  that  require  source  v.

Accordingly, in CCS Mr ∩ Sv > 0 , containing that three existing operations in set N which need both machine r and the handling resource v for execution, that is loading and unloading operations.

Specified that operation I has been loaded upon machine r, part contact constraints should make sure that no other operation is scheduled upon this machine till the unloading operation, Di has been finished. Mathematically, the part contact constraints can be illustrated by the given set of constraints as:

ti  - tCi ≥ pCi, Λ tDi - ti ≥ pi,                n i n Mk , k = 1, 2, 3, ... , m . . . (4)

tCj  - tDi ≥ pDi V tCi - tDj  ≥ pDj           n i, j n Mk , i n  j, k = 1, 2, 3, . . . , m. . . (5)

 tw - ts  ≥ ps, V ts - tw  ≥ pw             n i, j n H v , v = 1, . . . , h . . (6)

here the constraint in Eq. (4) implies the technological relations and which no operation can be scheduled among Ci, i and Di,, the constraint in Eq. (5) shows the capacity constraints  for  the  machine  and  the  constraint  in  Eq.  (6)  Shows the capability constraints for the material handling resources. This is assumed that all resource processes one operation at a time.


Related Discussions:- Part contact states

Working of gasifier combined cycle power plant, With the help of a neat dia...

With the help of a neat diagram illustrate the working of Gasifier combined cycle power plant. Describe with the help of neat diagram the working of Pressurised water reactor nu

Force - mechanics, Force - Mechanics: Sometime we push the wall, then ...

Force - Mechanics: Sometime we push the wall, then there are no changes in position of wall, but no doubt we apply a force, as the applied force is not sufficient to move the

Spot welding-resistance welding processes, SPOT WELDING In this type of...

SPOT WELDING In this type of welding, after proper cleaning of the surfaces, the metals to be welded are kept one above the other and two copper electrodes are kept on both sid

Physical properties of materials, why is physical properties of materials i...

why is physical properties of materials important in design and for industrial application?

Determining the largest eigenvalue, The Power Method is a classic numerical...

The Power Method is a classic numerical algorithm for determining the largest eigenvalue and eigenvector associated with a matrix A. Write a matlab function that returns the larges

Belt friction, Ask question # how to derive a expression for the centifugal...

Ask question # how to derive a expression for the centifugal tension in belt driver

Explain the importance of value engineering, Explain the Importance of Valu...

Explain the Importance of Value engineering Improve your career skills Separate "Symptoms" from "problems" Solve "root cause" problems and capture opportunities

Describe dry and wet parting materials, Q. Describe Dry and wet parting mat...

Q. Describe Dry and wet parting materials? Dry parting materials: These are applied by dusting. These include : charcoal, ground bone and limestone, lycopodium(a yellow veget

Carnot cycle, matlab programme for carnot cycle

matlab programme for carnot cycle

Describe about chain-wire and tape gauges, Q. Describe about Chain-wire and...

Q. Describe about Chain-wire and tape gauges? Chain, wire and tape gauges are fixed on structures like bridges and the weight is lowered to touch the water surface. Movable sti

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd