The Measure of a ship’s character
This article, published in Navy Today, looks at DTA’s work on developing a software tool that examines patterns of normal vessel movements and highlights anomalies which can then be looked at more closely.
To read more about this work see page 29 of Navy Today – Issue 207 [PDF: 2.42 MB, 36 pages]
Polyurethane sandwich panel systems for ship hull reinforcement
The Royal New Zealand Navy (RNZN) regularly patrol the waters of the Sub-Antarctic Islands and the Southern Ocean in support of the Department of Conservation and Ministry of Primary Industries. Operation in these waters includes the potential presence and threat from ice, and RNZN Offshore Patrol Vessels are protected against ice with a belt of thicker steel about the waterline. Excessive pitch and roll of vessels can however result in thinner and more vulnerable areas of the hull being exposed to sea ice.
Defence Technology Agency were tasked by the RNZN to evaluate whether there was potential to enhance the level of ice protection on vessels through the use of a polyurethane cored steel faced sandwich panel system that has recently been offered by commercial suppliers. This report summarises mechanical testing undertaken to explore the viability of this type of sandwich panel system. Testing included shear, flexure and impact testing across the likely temperatures that the system would be operationally exposed to, as well as fatigue and corrosion testing.
Results of the tests indicate that a polyurethane cored steel faced sandwich panel system is a viable solution for hull reinforcement, and raised a number of recommended questions that should be answered by any prospective supplier of a solution to the RNZN.
Read this report [PDF: 2.58 MB, 31 pages]
Blended learning is not new but the explosion of technology enabled learning
techniques since 1990 is new and transforming the possibilities of delivering learning
solutions in the military. This paper first defines what is meant by blended learning,
then looks at the various learning options and the problems with implementing them.
It concludes that most of the difficulties can be overcome but that a top down
approach is needed to provide the impetus, infrastructure and direction to realise the
business benefits. It recommends that a strategic plan be developed to provide the
NZDF integrated learning environment necessary to achieve the Future 35 vision.
Read this report [1066 KB, 48 pages]
Learner profile survey 2015 – key facts
This report is the result of a survey of NZDF personnel, both uniformed and
civilian, during September and October 2015. It forms part of a five-year study and
follows on from surveys in 2013 and 2014.The aim of the study is to understand
how NZDF personnel use technology for training, learning and recreation both at
work and at home. The Survey was sent out by email to 2949 recipients and 1188
(40%) responded. The results provide a snapshot of the use of technology in the
NZDF and indicate that technology could be used more effectively to deliver
competent people to front line units and to provide more effective support to them
once they are there.
Read this report [PDF: 996 KB, 29 pages]
DTA Digital Image Correlation Capability
Digital Image Correlation (DIC) is a technique for optically acquiring full-field
measurements of the displacement and deformation of a surface. This is achieved
by observing the surface as it deforms, typically using one or more conventional
monochrome digital cameras, and comparing the surface’s deformed and
undeformed states using optical tracking.
The Defence Technology Agency’s Applied Vehicle Systems group has now
developed an in-house DIC system. The wide array of variables that determine the
measurement precision achievable when using DIC makes it difficult to identify a
specific metric quantifying this system’s accuracy. However, a conservative estimate
is that deformation measurements can be obtained with a precision of 1000
microstrain or better in most cases. Greater precision may be achievable in a
number of instances, particularly for cases involving smooth strain fields where
significant smoothing can be applied to the measured displacements without
detrimentally affecting the results.
This system is now available to enhance the Applied Vehicle Systems group’s
structural analysis toolset, providing a full-field strain measurement capability for
New Zealand Defence Force platforms. In contrast to commercial DIC systems, this
in-house system can be fully customised and adapted to suit individual New Zealand
Defence Force requirements.
Read this report [PDF: 1.3 MB, 34 pages]
Blast Noise of the L119 Light Gun
Blast noise measurements were carried out on the New Zealand Army L119 Light
Gun by the Defence Technology Agency in June 2015 at Exercise Brimstone. The
purpose of the assessment was to determine the sound pressure levels near the
gun crew and estimate the effectiveness of a number of hearing protectors. The
acoustic pressure was measured slightly forward of the loader’s position, approximately
three metres back from the muzzle at zero barrel elevation, one metre
from the gun centreline, and 1.6 metres from the ground. The peak sound pressure
level of the muzzle blasts was in the range 173–176 dB, the A-weighted
sound exposure level was 137–146 dB, and the A-durations were 0.65–2 milliseconds.
Double hearing protection (earmuffs and earplugs) should reduce the
peak sound pressure level to 138 dB, which is compliant with the Health and
Safety in Employment Act.
Read this report [PDF: 1.58 MB. 39 pages]
Colour vision requirements for aircrew
Colour Vision Deficiency (CVD) is a condition that results in individuals being unable to distinguish differences between certain colours. The condition is most commonly inherited, affecting approximately 8% of men and a smaller proportion (0.5%) of women. Exclusion of applicants with CVD reduces the number of potential candidates available for selection as aircrew.
This report presents and discusses available literature which indicates that aircrew with CVD are able to operate safely and effectively. The evidence raises questions about the suitability of current clinical test regimes as a means of restricting or disqualifying applicants. Consistent with the findings of NATO and the practice of some regulators, it is instead recommended that a practical or operational check, to identify practical handicaps as a result of CVD, is a more relevant and fair method by which to determine whether an applicant can safely crew an aircraft.
Read this report [PDF: 936 KB, 52 pages]
Trial Firefly – Building a Space Situational Awareness Capability
The aim of Trial Firefly was to observe a number of satellites in low Earth orbit using widefield imaging from two different locations, in order to determine the space trajectory and compare the measurements with the predictions based on the standard two-line element sets.
The trial was originally planned to cover the shallow atmospheric re-entry of the Automated Transfer Vehicle 5, but that had to be changed as the re-entry
plan was subsequently altered by the European Space Agency. The entire activity was proposed as an initial step in building a new Space Situational Awareness capability at the Defence Technology Agency.
A preliminary analysis of the trial data has shown that relatively inexpensive equipment can be used to detect satellites at moderate altitudes and the results confirm that this type of observation can be used to improve the current orbital models
Read this report [PDF: 3.89 MB, 69 pages]
DTA Research, Science and Technology Strategic Plan
This strategy has been developed with the aim of better supporting capability delivery through an approach that aligns research, science and technology with Defence priorities, and targets capability development and acquisition where there is potential to realise significant research, science and technology value.
Read this report [PDF: 1.95MB, 20 pages]
Review of NZDF research into fastener hole cold working
The New Zealand Defence Force has undertaken a number of research activities in the area of Hole Cold Working. Some of this work was undertaken as a result of the C-130 upgrade programme, while others were undertaken as student projects at local Universities. In addition the Defence Technology completed a significant internal NZDF programme. The NZDF has been able to demonstrate a signifiant durability improvment as a result of the Hole Cold Working which will likely reduce the occurrence of unscheduled repairs of fatigue cracking in the C-130 fleet.
Read this report [PDF: 728kb, 26 pages]
New Zealand Army dismounted soldier power requirements
This report investigates the power requirements of electronic equipment that New Zealand soldiers carry into theatre. It analyses different soldier roles and units and evaluates foreign soldier power requirements to estimate possible future NZ Army dismounted energy requirements.
Read this report[PDF: 268kb, 30 pages]
The challenge of maritime domain awareness for New Zealand
This presentation, by DTA’s Director, Brian Young, was given at the ‘Global Challenge, Global Collaboration’ conference in Brussels.
The discussion topic was ‘Maritime surveillance – the benefits of global collaboration to promote good stewardship and safe conduct in the world’s oceans.’
View this presentation [PDF: 1.2MB, 16 pages]
Learner profiles: RNZN personnel, their use of technology and the potential for self-directed learning – a pilot study
Report on a pilot study conducted with Royal New Zealand Navy (RNZN) uniformed personnel to understand how they access and use technology for training and recreation, at work and at home. The study also assesses the potential of RNZN personnel to undertake self-directed learning.
Read this report [PDF: 1.3MB, 57 pages]
Learner profiles – detailed results [PDF: 544kb, 152 pages]
Initial study on expendable acoustic countermeasures for torpedo defence
Report on the initial study into the effectiveness of expendable acoustic countermeasures on passive acoustic homing torpedoes.
Read this report [PDF: 1.3MB, 57 pages]
Bamiyan Province climatology and temperature extremes in Afghanistan
Report on the temperature extremes encountered in Afghanistan and an assessment of how climatic conditions may affect Kahu UAS operations.
Read this report [PDF: 1.48Mb, 37 pages]
Wake up to helicopter wake
This article describes the issue of helicopter wake turbulence, especially in respect to the NH90 helicopter. From DTA’s research, the risks are now better understood, including how aircraft can avoid wake upsets.
Wake up to Helicopter Wake [PDF: 512Kb, 1 page]