Off-Highway Engineering - February 6, 2014 - 8

TecHnical
INNOVATIONS
Hydraulics

identifying operating states for equipment
and system diagnostics

The GIM research platform for the
recognition of operating states of a wheel
loader for diagnostic purposes. The
telescope and the bucket have been left
off the figure for purposes of clarity.

Machinery diagnostics require analysis of the time
series of sensor and control signals. To analyze the
time series data, different operating states that describe the transients of the measured variables
need first be detected. After that, some higher level
description should be used to further analyze these
operating states.
Finding operating states from the measured time
series data requires segmentation of the time series
data. Segmentation is a method that allows the
dividing of time series data into smaller groups of
data sets that describe the patterns of the measured variables. In segmentation, the time series
data are transformed into piecewise representation.
A segment is a contiguous subset of a time series.
Time series segmentation is often used as a preprocessing step in time series analysis applications.
Time series segmentation is exploited in a wide
range of applications such as medical diagnostics,
analysis of financial time series, speech processing,
or sensor signal analysis.
Typically, in modern machinery there is already a
lot of information available about the operation of
the machine, e.g. process and control data through
communication buses, which can be used in analysis. In addition to this, condition monitoring specific
sensors can also be added to the system.
When all this information from communication
busses and additional sensors is recorded, it leads
to the generation of a huge amount of data. High

8 February 6, 2014

dimensionality complicates the processing of time
series data, especially from the pattern recognition
point of view. After segmentation, the segments
have to be organized into groups of similar members so that data can be classified against these
groups. This grouping process is often referred to
as clustering.
A cluster is a collection of objects that are similar
between them and are dissimilar to the objects belonging to other clusters. These clusters are then
interpreted to be operating states. Diagnostics can
now be focused on these operating states or even a
single interesting operating state. Most information
in regard to the detection of anomalies is usually
obtained from operating states that have the biggest changes in the analyzed variables.
Researchers from Tempere University of
Technology studied the operating states of a wheel
loader for diagnostics purposes using a real time
simulation model of an articulated-frame-steered
wheel loader.
The wheel loader, referred to as a GIM-machine,
was designed to serve as a platform for different
types of research. The frame of the machine is original, but the control system, electronics, and hydraulics had been changed for a variety of research
purposes.
In this case, a hydrostatic transmission was implemented with an electronically actuated variable
displacement pump and fixed displacement mo-

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President
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Ronald G. Rath
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SAE Publications Board
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Off-Highway Engineering


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Off-Highway Engineering - February 6, 2014

Table of Contents for the Digital Edition of Off-Highway Engineering - February 6, 2014

Off Highway Engineering - February 6, 2014
Contents
What’s New at ConExpo/IFPE
What’s Online
Editorial
Technical Innovations
Injection strategies for improving emissions characteristics
Systems that talk together, are efficient together
Managing the deluge of data
A vision for SAE’s future
Original Equipment
Companies Mentioned
Upcoming from the Editors
Ad Index
Q&A
Off-Highway Engineering - February 6, 2014 - Off Highway Engineering - February 6, 2014
Off-Highway Engineering - February 6, 2014 - Cover2
Off-Highway Engineering - February 6, 2014 - Contents
Off-Highway Engineering - February 6, 2014 - What’s Online
Off-Highway Engineering - February 6, 2014 - 3
Off-Highway Engineering - February 6, 2014 - 4
Off-Highway Engineering - February 6, 2014 - 5
Off-Highway Engineering - February 6, 2014 - Editorial
Off-Highway Engineering - February 6, 2014 - 7
Off-Highway Engineering - February 6, 2014 - Technical Innovations
Off-Highway Engineering - February 6, 2014 - 9
Off-Highway Engineering - February 6, 2014 - 10
Off-Highway Engineering - February 6, 2014 - 11
Off-Highway Engineering - February 6, 2014 - 12
Off-Highway Engineering - February 6, 2014 - 13
Off-Highway Engineering - February 6, 2014 - 14
Off-Highway Engineering - February 6, 2014 - Injection strategies for improving emissions characteristics
Off-Highway Engineering - February 6, 2014 - 16
Off-Highway Engineering - February 6, 2014 - 17
Off-Highway Engineering - February 6, 2014 - 18
Off-Highway Engineering - February 6, 2014 - Systems that talk together, are efficient together
Off-Highway Engineering - February 6, 2014 - 20
Off-Highway Engineering - February 6, 2014 - 21
Off-Highway Engineering - February 6, 2014 - Managing the deluge of data
Off-Highway Engineering - February 6, 2014 - 23
Off-Highway Engineering - February 6, 2014 - 24
Off-Highway Engineering - February 6, 2014 - 25
Off-Highway Engineering - February 6, 2014 - A vision for SAE’s future
Off-Highway Engineering - February 6, 2014 - 27
Off-Highway Engineering - February 6, 2014 - 28
Off-Highway Engineering - February 6, 2014 - 29
Off-Highway Engineering - February 6, 2014 - Original Equipment
Off-Highway Engineering - February 6, 2014 - 31
Off-Highway Engineering - February 6, 2014 - 32
Off-Highway Engineering - February 6, 2014 - 33
Off-Highway Engineering - February 6, 2014 - 34
Off-Highway Engineering - February 6, 2014 - 35
Off-Highway Engineering - February 6, 2014 - Companies Mentioned
Off-Highway Engineering - February 6, 2014 - Ad Index
Off-Highway Engineering - February 6, 2014 - 38
Off-Highway Engineering - February 6, 2014 - 39
Off-Highway Engineering - February 6, 2014 - Q&A
Off-Highway Engineering - February 6, 2014 - Cover3
Off-Highway Engineering - February 6, 2014 - Cover4
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