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EXPERIMENTAL STUDY ON
VERTICAL STATIC STIFFNESS OF
POLYCAL WIRE ROPE ISOLATORS
AAQIB HUSSAIN
RA1612003010003
MTech-CAD

Introduction.
Wire rope isolators.
Polycal wire rope isolator.
Methodolgy.
Experimental set up.
Results and discussions.
Conclusions.
References.
CONTENTS

VIBRATION: Its one of the most destructive
means for industrial equipment or structures.
 These vibrational disturbances can gradually reduce the life
of machines or structural elements in the industry.
SOURCES:
Natural.
• e.g (earthquake,wind…)
Man-made.
• e.g (operations of heavy machines)
INTRODUCTION

 Wire rope isolator is one of the most effective isolation system that can
be used to attenuate the vibration disturbances and shocks during the
operation of machineries.
 TYPES:
WIRE ROPE ISOLATOR
Helical type Polycal type

Experimental study on vertical static stiffness of Polycal Wire rope Isolator (PWRI) .

POLYCAL WIRE ROPE ISLOLATOR
Polycal wire rope isolator (PWRI)
is effective in isolating the system
from vibrational environment.
 PWRI possess high damping
capabilities which can help in
vibrational energy dissipation.
Low maintenance.
Durability.
Flexibility.

METHODOLOGY
Loading directions of PWRI PWRI for Experimental work
• The experimental work was conducted to understand the behaviour
of PWRI with different geometric dimensions under vertical loading.
• Each isolator has its own individual geometric dimensions varying
with wire rope diameter , height and width.

EXPERIMENTAL SET-UP
• All experimental tests were
conducted in Curtin University,
using the INSTRON Machine
• 5982 available in the laboratory
as shown in Figure 4.
• It can produce up to 100kN of
loading which is sufficient for
the test. It provides high
accuracy data acquisition
facilitated by Bluehill Software.
• the load-displacement graph is
displayed in the computer during
the test.

RESULTS AND DISCUSSIONS
• This section presents the
result of the monotonic
loading tests.
• The static elastic stiffness
of WRI was determined
from the behaviour in
monotonic loading
condition.
• The slope of the load-
displacement graph
represents the static
stiffness of WRI

 This section discusses the influence of height to width ratio of
wire rope isolator diameter on their compressive static
stiffness.
 The geometry of PWRI depends on its height and width.
Therefore, the changing of height and width of PWRI affects
the static stiffness value.
 The comparison among Isolator 1, 2 and 3 was made to
highlight the influence of height to width ratio on the static
compressive stiffness since they differ only in their height to
width ratio.
 An increase in height to width ratio by 20% decrease the
compressive static stiffness by 55%.
INFLUENCE OF HEIGHT TO
WIDTH RATIO

 In this work, monotonic loading tests were
performed to study the static stiffnesses of the
polycal wire rope isolators.
 The stiffness of PWRI was observed to be less stiff
due to compressive loading as compared to the
tensile loading , which can be caused due to the
hardening and softening behavior of the wire rope
material.
 High stiffness can be obtained by lowering the
height to width ratio and vice versa is applicable.
CONCLUSIONS

P.S. Balaji , Leblouba Moussa, Noman khandoker, Ting Yuk
Shyh, M.E Rahman, Lau Hieng Ho, “Experimental study on
vertical static stiffness of polycal wire rope isolators”,
217(2017)012032.
ML Tinker, MA Cutchins 1992 Damping phenomenon in a wire
rope vibration isolation system. Journal of sound and vibration
157 7-18.
REFERENCES

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Experimental study on vertical static stiffness of Polycal Wire rope Isolator (PWRI) .

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Experimental study on vertical static stiffness of Polycal Wire rope Isolator (PWRI) .