MP4706 Load Moment Indicator Assignment

Mechanical Engg.
MP4706
LOAD MOMENT INDICATOR (LMI) SYSTEM
Name –
ID -

Contents
INTRODUCTION...................................................................................................... 3
DESIGN OF LMI SYSTEM...................................................................................... 4
SOFTWARE PROGRAM FOR LMI SYSTEM................................................................5
RESULTS AND ANALYSIS........................................................................................ 5
SIGNAL CONDITIONING ELEMENTS EVALUATION...................................................6
PROPOSAL FOR FUTURE DEVELOPMENT................................................................7
Low Cost Controller............................................................................................ 7
Data transmission Methods................................................................................7
References :........................................................................................................... 8

INTRODUCTION
The measurement of the arm’s moment value and the bearing force is carried out by the Load
Moment Indicator ( LMI ) system. If the load being lifted is above the threshold value, the
crane’s arm may not be capable of lifting it and the mechanical structure may be affected. A
failure may occur in such a case. The operator must be given proper and timely signal if the
crane’s load capacity is increased. The 2 types of sensors which can be used are : Pressure
sensor and angle sensor. The system can help to increase the safety of the crane system. In
case of an overload , an LED can be blinked to denote the overload condition.
The work done by a crane can impose a danger at any time during its operation. A dynamic
system must be employed to ensure the safety of the operation being carried out. The
threshold limits can be set for various parameters and then if these threshold values are
crossed, then the operator must be informed about the same so that timely action by the
operator can prevent any type of mishappening.
A load moment indicator ( LMI ) system is a type of controller which can be employed in the
monitor as well as control of the various operations that a crane performs. The various inputs
and output values have been considered here. The crane helps to move an object and lift it
from one position to the other. The operator performing these operations must be able to see
the real time values of various parameters on an LCD display screen in his cabin. This
prevents any accident and makes the system safe. The various parameters are – the carrying
capacity of the lift, output at boom etc.