Design and optimisation of NiTi pressure gauge
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Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Mondragon Unibertsitatea
Abstract
This paper describes construction of NiTi pressure
gauge possible application mostly in an automotive. The aim
is to present data of an electrical properties based on multiple
input variables – the mechanical stress and the temperature of
surrounding environment. Last aim of this paper is to describe
development of the software for optimisation of the sensors shape
to reach given force range, to ensure that maximal strain wouldn’t
be crossed and to come up with a solution of compensation of
sensors resistance temperature drift and nonlinearities.
NiTi wires are very thermal dependent, but they shows
also several advantages including large recoverable strains and
higher sensitivity and smaller time constants then foil strain
gauges with on ranges linear dependence between resistance and
strain. Compensation is realised by combination of thermally
compensated quarter bridge with a look-up tables.
For realising look-up tables measuring system was equipped
by independent thermometer to be able to choose appropriate
characteristic and to judge on its limitations. Acquired data
shows that quarter bridge cannot be used by itself, namely when
subzero temperatures might be reached. This is due to material
properties of NiTi which affects maximal recoverable stress of
the wire and which is dependent on temperature.
We did several measurements of thermal characteristics,
stress-strain and resistance-strain characteristics. It was used for
software development. The used model allowed to skip some of
the model creation processes, resulting model has been validated
by measurement.
Description
Subject(s)
Gauge design, NiTi, Pressure gauge, Thermal compensation, Binary alloys, Titanium alloys
Citation
ISSN
ISBN
978-1-5090-5582-1