Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Logistics Management > WAREHOUSES OVERVIEW > Flashcards

WAREHOUSES OVERVIEW Flashcards

1
Q

A distribution network is conformed by:

A
  1. transport
  2. warehouses
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Warehouses, part of a DN, have 3 characteristics:

A
  1. Functions
  2. Types
  3. Functional areas
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. Functions
    What are they?
A

a) Storage: static.

Decoupling point, leverage of unpredictability of demand and LT.

b) Transformation and sort the flows: dynamic

Flows management

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. Types
    What are the main types of nodes?
A

a) Warehouses:
Inventories are present.
Safety and Cycle stocks
Materials planning and management needed. down and upstream flows.
Static +Dynamic functions

b) Transit points
Inventories absent, goods stored only to sort them.
In transit stocks.
Re-packing, cross docking, delivery
Dynamic functions only

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. Activities:
    What are the main activities (5)
A
  1. Receiving
  2. Put-Away
  3. Storage
  4. Picking
  5. Shipping

1-3 Inbound
3-5 outbound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What warehousing activity is characterised by:

Schedule carrier
Unload vehicle
Inspect for damage
Compare to P/O

A
  1. Receiving
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What warehousing activity is characterised by:

Identify the product
Identify the storage location
Move products
Update records

A
  1. Put-away
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What warehousing activity is characterised by:

physically maintaining the products in the designated or random area of the WH

A
  1. Storing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What warehousing activity is characterised by:

Managing order info
Picking goods
Moving goods
Labelling package

A
  1. Picking
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What warehousing activity is characterised by:

Scheduling carrier
Loading vehicle
Bill of landing
Recording update

A
  1. Shipping
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When we talk about designing a WH, what are we defining? (2)

A

Handling system & layout

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

3 Handling storage parameters:

A
  1. Design parameters
  2. Descriptive parameters
  3. Cost Parameters
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Handling storage parameter,
Design 1/2 :

Number of UL locations (UL)

A

SC: Storage Capacity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Handling storage parameter,
Design 2/2 :

Flow of UL. (UL/h)
Input Capacity
Output Capacity

A

TC: Throughput capacity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Handling storage parameter,
Descriptive 1/3 :

Number of units I can store per m2 (UL/m2)
SC / WH Area

A

AUR: Area Utilisation Rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Handling storage parameter,
Descriptive 2 /3 :

Directly accessible UL locations / SC
Ratio <= 1

A

Selectivity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Handling storage parameter,
Descriptive 3 /3 :

UL stored / SC
Ratio <= 1

A

Saturation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Handling storage parameter
What are the 2 Cost parameters

A

Storage cost per UL
[ € / UL*year ]

Handling Cost per UL handled
[ € / UL]

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are:

Block stacking
Rail Racks
Selective pallet racks
Flow racks

A

Storage Systems for big size UL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are:

Miniload
Carousels
Vertical AS/RA

A

Systems for small size UL

OR

Picking Systems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Mainly used to move pallets both horizontally and vertically

A
  1. Counterbalance forklift (sit)
  2. Straddle reach (standing)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Mainly used to move pallets both horizontally and vertically usually in the aisles
Expensive

A
  1. side loaders
  2. turret trucks
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Used to move horizontally and unload trucks

A

walkie stackers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

You storage in the floor
No racks
UL must be stackable (3/4)
Low selectivity
LIFO
Low AUR
High Inventory level

A

Block stacking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Racks
UL non or stackable
better selectivity
Special trucks 1m
LIFO
High AUR
High Inventory level

A

Drive in/through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Storage system that enables gravity-based moving with inclined roll conveyors
Low selectivity
Low retrieval
Medium to high stock level
High cost

A

Paet/case flow rack system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

amount of time it takes to locate, pick, and retrieve a specific item from the warehouse once it has been requested.

A

retrieval time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Couple of racks separated by working aisles
uprights and beams
High selectivity (1 if 1 dept)
Cost is low 20 € / UL

A

Selective Pallet Rack system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

2 solution we could distinguish when designing a storage system with trucks:

A
  1. Traditional + truck
  2. Storage system + AS/RS
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What are:
1. Management of Operative cycles
2. Space Allocation

A

Warehouses Management policies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q
  1. Management of Operative cycles:
A
  1. Single Command Cycle to store or retrieve. 1UL
  2. Dual Command cycle to store or retrieve. 2UL
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

How Single Command Cycles time is conformed:

A

Variable time:
Related to distances horizontal (transfer) & vertical (lifting).
With or without the load.

Fixed time:
Wait for data transfer
Curves
Positioning
Load / Unload

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Compare Dual vs Single cycles in terms of:
Efficiency
Cycle length
Fixed time incidences
Requirements

A

Efficiency:
2 instead of 1 UL per cycle.

Cycle length:
Longer but in proportion to 1UL shorter.

Fixed time incidences:
Lower

Requirements:
The UL has to be ready for storage and retrieval.

34
Q
  1. Space allocation
    What is it?
A

Criteria to decide where to placate UL of an article and the space subdivision criteria

35
Q

Number of ULi RETRIEVED from the storage system during a time window T

A

Retrieval Index

36
Q

Retrieval Index of i,T divided the number of locations assigned to I during T.

A

Access Index
(how visited is a location)

37
Q

What happens when I have different items with different Access index

A

I wan to place the items that I visit most (higher AI) closer to the I/O to decrease operative cycles.
Dedicated space or classes needed for this approach.

38
Q

What are the main allocation policies?

A

a) Random storage:
location shared

b) class based storage:
Locations assigned to class of Items

c) Dedicated storage
Locations are assigned to specific Items

39
Q

Rank the three allocation policies in terms of:

Efficiency of cycle time, complexity and storage capacity.

0 is low
1 is high

A

0 Random storage
.5 class based storage
1 Dedicated storage

40
Q

If I take a Dedicated storage policy, how do I calculate the capacity of the system?

A

As it is dedicated I need to make sure that the max qty of each of the scheduled items, in a year for example, will have a place in the WH.

Take the highest qty among items and sum it up.

41
Q

If I take a Random storage policy, how do I calculate the capacity of the system?

A

Random the location is shared, so I need to make sure that the highest period qty will fit in the WH.

monthly sum and I take the max as the capacity needed.

42
Q

Class based storage,
How do I know how to place the zones.

A

In a selective storage system served by counterbalance lift there are two arrangements that follow ISO-TIME-CURVES.
In triangle if the II/= is only located in the middle or rectangular if I/O is all along the side.

Always A closer to I/O and normally 2 or 3 classes.

43
Q

Class based storage:
How do I define the classes

A
  1. AVG of all AI
  2. AI A > AI avg
  3. AVG remaining AI
  4. AI B > AI remaining avg
  5. C remaining (or again)
44
Q

True or false

The higher the # of classes the higher the managerial complexity of the system

A

True

45
Q

Explain the ABC curve:
Access / occupied space

A

x: occupied space in terms of % UL locations

y: % access

Curves represent the relationship of how the behave when one of them changes.

46
Q

If I manage to concentrate as much as possible my access in 20 % of my sace…

A

I get benefits as reduction of the operative cicle VARIABLE time with respect to random storage.

And having +1 class reduces it even more! But increases complexity managerial.

47
Q
  1. Clustering the items by storage system
  2. Required performances (SC-TC)
  3. Constrains
  4. Storage system selection
  5. Area PRE-design
  6. Modeling and simulation
  7. Technical - Economical checks
  8. Design
A

Main Design Principles

48
Q

Criteria to cluster items:

A

Technical features:
dimensions, weight, fragility

Environmental req:
Temperature, humidity

Safety req:}Fire prevention, hazardous, non compatibility

49
Q

Design constrains:

A

Urban:
heights, distances

Technical:
Surface and shape of the ground

Safety:
Escape routs

Economical:
Available resources

50
Q

If we divide the design framework into 3 phases wha are those:

A
  1. Identify design parameters SC-TC
  2. Layout design to cover SC
  3. Throughput capacity assessment TC
51
Q

What are the assumptions we make for a conventional manual storage system?

A

trucks not connected to # aisles

Data exist
Singledeep selective racks
Full pallet loads not mixed
counterweight forklift trucks
No picking activities

52
Q

Is the analysist that:

Takes into account the values of the flows (hr/day) from storical data

A

Analysis of phisical flows

Throughput capacity

53
Q

Throughput Capacity TC

How is TC assesed in terms of handling system for storing and retrieving

A

If same system:
TC= Fin+Fout

If diferent:
TCin= Fin
TCout=Fout

54
Q

How can I chose a best storage solution?

A

Calculating the NPV
NPV=-Io-OCt+TV

55
Q

Io in NPV

A

Initial invertion:
Storage (racks)
Land (area)
Handling system (trucks)

The price I pay to get them

56
Q

TV in NPV

A

Terminal Values after T period:
Storage (racks)
Land (area)
Handling system (trucks)

What they will value as assets

57
Q

OCt in NPV

A

Operative cost:
How much i will pay to handle the pieces of one year during the period T and considering the increase of annual cost capital (K).

58
Q

True or false

In a Drive in and in a sigle deep rack the pallets are places in the same way the diference is the truck where it take them from

A

True

59
Q

U side of my warehouse divided the dimension U side of the UM

Uum= 2*DeepUL+aisle width

A

Number of aisles
NA

I use dimentions

60
Q

SC divided how many PL I storage in 1 column

UL per column = 2BayULNA*NL

A

Number of Columns
NC

I use capacity

61
Q

The I/O point is in the corner

A

U=V
P=2*( U/2 + V/2)
a=2

62
Q

The I/O point is in the midle

A

U=2V
P=2*( U/4 + V/2)
a=4

63
Q

The I/O point is all along

A

U=1.5V
P=2*( U/3 + V/2)
a=3

64
Q

How to calculate the Time of a single comand cycle

A

TSCC= FT + VT
FT given
VT=P/Vh + S/Vv

If Access aisle, sum it to P

65
Q

How you calculate the TC by truck

A

TCtruck= UF*3600/TSCC

66
Q

How you calculate needed trucks

A

SC/SCtruck

67
Q

Automated Storage Systems

Compare an automated storage system against a standard one on terms of layout:
Height
Aisle Width
Lenght
AUR

A

Height: higher
Aisle Width: narrower
Lenght: higher

AUR: Strong impact

68
Q

Automated Storage Systems

Compare an automated storage system against a standard one on terms of Handing system:

A

AS/RS machines
Automated I/Osystem

Positive impact in TC

69
Q

Automated Storage Systems

Main choices about system configuration regarding:
Structure

A
  1. Standard
  2. Sunk
  3. Rack supported
70
Q

Automated Storage Systems

Main choices about system configuration regarding:
S/R macines / #aisles

A

=1
diff 1

71
Q

Automated Storage Systems

Main choices about system configuration regarding:
Rack Depth

A
  1. Single Deep
  2. Double Deep
72
Q

Automated Storage Systems

Main choices about system configuration regarding:
Telescopic Forks per machine

A

1
2

73
Q

Automated Storage Systems

When to select this type of solution

A

Low vailability / high cost area
High storage capacity
High TC
Specific conditions of the product

74
Q

Automated Storage Systems

Drawbacks

A

Low flexibility
Investment
Reliability

75
Q

Automated Storage Systems

Which type of coordinates can we use?

A

Spatial or Time

76
Q

Automated Storage Systems

How can I calculate time coordinates:

A

Tx=X/Vx
Ty=Y/Vy

The time is the one from the highest between X or Y

77
Q

Automated Storage Systems

Management policies
1. Operative Cycle types
2. Optimization of dual command

A
  1. Operative Cycle types
    Single
    Dual
  2. Optimization of dual command
    NCZ No Cost Zone
    MTB Minimum travel between
78
Q

Automated Storage Systems

VT Variable time depends on pallet location

FT does not

T or F

A

True

79
Q

Automated Storage Systems

Why are Dual Command Cycles more efficient than Single Command Cycles?

A

They can move 2 UL in less than 2 single cycles

80
Q

Automated Storage Systems

The idea is to couple a storage/retrival in a specific paallet location with a retrival/storage in the closest pallet location.

Minimize the interleave without the load.

A

MTB
Minimum Travel Between

81
Q

Automated Storage Systems

Cople a Storage/Retrival in a specific pallet locoation with a retrival/storage withough increasing the Variable time of the cycle.

A

NCZ
No Cost Zone

82
Q

Automated Storage Systems

Autonomous Vehicle Storage and Retrieval System

A

Decouples Vertical and Horizontal movements
Increases SL and reliability

Logistics Management (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions