Master of Defence Technology and Systems Seminar

Master of Defence Technology and Systems
Seminar
Presented by MDTS 2013 Graduates
30 October 2014
Thursday
1.00 – 6.00 pm
Blk EA, Engineering Auditorium
National University of Singapore
RSVP: Ms Wong Hsiao-Szu ([email protected]) by 15 October 2014
Dress code: Office attire
Thesis Project
AFIT
Image-aided Inertial Navigation System
Presented by: Jason Png
Cranfield University
Design of Single Wheel Tester
Presented by: Elton Teo
Integrated Project Presentation
NPS
Distributed Surface Force
Presented by: MAJ Foo Ceying, Mr Eldine Ling, Mr Daniel Ng
The Distributed Air Wing
Presented by: ME5 Lee Joong Yang, Mr Vens Ong, Mr Martin Tan
AFIT
Radio Frequency Geo-location using Small Unmanned Airborne System
Presented by: ME5 Jason Png
Cranfield University
Systems Engineering Approach to Helicopter Main Gear Box Reliability Improvement
Presented by: ME5 Tee Shy Chuan
Investigation of Drawbar Pull Performance in Littoral Zones
Presented by: Elton Teo
Refreshments & Viewing of posters on graduates’ projects
Distributed Surface Force
MAJ Foo Ceying, Eldine Ling, Daniel Ng, Tan Min Yan, Serene Teo, CPT Edwin Toh,
Presented by: MAJ Foo Ceying, Mr Eldine Ling, Mr Daniel Ng
Large naval surface combatants are potentially held at risk by adversarial antiaccess aerial denial (A2AD) weapon systems. To mitigate that risk we propose
a distributed surface force concept, which relies on a cost effective small surface combatant (SSC) capable of augmenting current forces in the 2025-2030
timeframe. We show that dispensing offensive and defensive power onto numerous smaller platforms has several advantages, including a more resilient
force structure, greater number of ships, and fiscal cost savings.
After employing the systems engineering process tailored to the problem to
understand requirements and alternatives, a single mission SSC adapted to anti-surface warfare (ASUW) emerged as the solution. The SSC is conceptually
employed in an armada composed of existing naval forces, which provide a
protective shield against a multi-threat enemy force. The Armada is nominally
composed of Arleigh Burke-class destroyers, Littoral Combat Ships and SSCs.
The SSC’As capabilities include eight anti-ship cruise missiles with a range of 90
nautical miles, speed greater than 25 knots, and organic detection and classification range of at least 60 nautical miles.
The Distributed Air Wing
Goh Wei Jun, ME5 Lee Joong Yang, Candy Loo, Matt Ng Kok Wah, Vens Ong Chee Siong, Tan Hock
Woo, Martin Tan, Tng Chung Siong, Roy Yang
Presented by: ME5 Lee Joong Yang, Mr Vens Ong, Mr Martin Tan
The development of advanced anti-access/area denial (A2AD) threats by potential
adversaries presents a significant challenge to the United States Navy. The
proliferation of these threats makes operating an aircraft carrier from contested
waters a high-risk endeavor. If a carrier must be withheld from the battle or is put
out of action, the entire capability of the air wing is lost.
The Systems Engineering process was applied to this problem by exploring a
concept called the “Distributed Air Wing” (DAW). This high-level concept includes
various methods to distribute and disperse naval air capabilities from their
centralized location on an aircraft carrier.
This study outlines the development and analysis of three conceptual designs that
fall under the concept of the DAW: a dispersed land and sea basing concept that
utilizes carrier-borne Navy and Marine Corps aircraft, a seaborne unmanned
aircraft courier system, and a carrier-based unmanned air-to-air vehicle. The
analysis within shows that a mixture of these alternatives in varying degrees
delivers the Fleet’s most critical capabilities—Intelligence, Surveillance and
Reconnaissance (ISR), Offensive/Defensive Counter Air, and Surface/Land Strike—
with less risk than the current Carrier Air Wing (CVW) force structure and
operational doctrine.
Radio Frequency Geo-location using Small Unmanned Airborne System
ME5 Jason Png
This integrated project encompasses an in-depth application of systems
engineering. It takes the student through mission area analysis, definition of
operational need, concept formulation, analysis of alternatives, requirements
refinement, architecture, preliminary design, detailed design, build, test and fly. A
current DoD mission area has been chosen (Radio Frequency Geo-location using
Small Unmanned Airborne System) as the theme for the integrated project.
Students are expected to deliver a low-cost, small-unit deployable UAS capable of
detecting, geo-locating and imaging the source of RF emissions.
Systems Engineering Approach to Helicopter Main Gear Box Reliability Improvement
ME5 Tee Shy Chuan
This project explores the reliability improvement of the helicopter main gearbox and it
covers two key aims: To adopt a system engineering approach to reliability improvement
and to investigate the performance of thioether mist lubrication against that of a
conventional oil jet lubrication system.
The project first examines the criticality of lubrication on a helicopter main gearbox and the
potential use of thioether as an emergency lubricant. The main gearbox defects associated
with inadequate lubrication are also reviewed. It next analyses, through system thinking,
the complex integration of people, purpose and processes related to the reliability
improvement of the helicopter main gearbox. The report also details the considerations for
the setup of a main gearbox test rig complete with instrumentation, the design and routing
of a thioether mist lubrication system, as well as the approach to the lubrication test plan.
Through systems thinking, the stakeholders’ interests, concerns and their levels of influence
have brought about differing management approaches. The investment in R&D of new
MGB technologies and the raising of certification standards on MGB designs provide the
best intervention options. The results of the lubrication tests show that effective routing of
thioether mist can be achieved using existing galleries within the main gearbox and that
thioether is compatible with the elastomeric seals. Results also show that thioether mist
lubrication has lower churning losses than oil lubrication in the absence of load. Under load
conditions, the high-speed input module of the main gearbox attains the highest
temperature and is a limiting factor to the gearbox operation. In the initial period following
an “oil-off” condition, the rate of temperature rise of the gearbox with thioether mist is
comparable with that of residual oil and is lower than that of dry gears. This suggests that
residual oil provides boundary lubrication during the initial period following an “oil-off”
condition. The performance of thioether mist for an extended period following an “oil-off”
condition was not determined due to a problem with the test rig. It is recommended that
the last test be reconvened to verify the true performance of thioether mist lubrication.
Investigation of Drawbar Pull Performance in Littoral Zones
Elton Teo
Terramechanics plays a significant role in designing and developing off road vehicles for
a given mission and environment. Amphibious military operations are unique as troops
would transit from the sea onto the land and are usually of an invasion nature. The
littoral zone is that part of the land surface influenced by marine processes. It extends
from the landward limit of tides, waves, and coastal dunes, and seaward to the point at
which waves interact significantly with the seabed. The most important aspect of beach
composition affecting soil strength is the grain size of the granular material comprising
the critical layer. In order to understand vehicle-terrain interaction, properties of the
soil have to be accurately measured. The soil properties depend on the nature of the
particles, their sizes and how much space the voids occupy between them particles.
Mulhearn in his report have summarised and reviewed how the CI values can be
estimated from other parameters, based on the report from Jenkins. The effect of the
waves and properties of beach materials affect the trafficability of vehicles on the
beach. The mean grain size of the sand also determine the slope of the beach which
affect the available drawbar pull of a vehicle. Thus, it is necessary for the vehicle to have
sufficient drawbar pull to overcome obstacles in littoral zones. The single wheel tester
was improved as Mk. IV and successfully used to carry out drawbar pull measurements
in the sand pit. The filter was able to improve the signal from the load cell by reducing
the noise. Damage on the wheel indicates the wheel is slipping and it will be necessary
to have wheel slip measurement to determine how the drawbar pull vary with wheel
slip. Direct shear tests and sand sieve analysis were carried to categorise the sand
samples previously collected. It is noted the sand samples were similar in grain size and
the shear strength results further indicated that. Future works are recommended to add
wheel slip measurements, select proper wheels for future similitude studies and to
carry out more soil testings of samples from beaches in other regions.
Thesis Posters

4F optical readout system for THz MEMS sensors Toh Wei Quan Edwin (Army)

Agent and System Dynamics Modeling of Peace Keeping Operations Tan
Hock Woo (ST Electronics)

Allocation of Resources between Protection and Sensors for Land Systems
for Offensive Operations in an Urban Environment Foo Ceying (Army)

Design of Single Wheel Tester Teo Wen Bin Elton (ST Kinetics)

Effects of Sensing Capability on Ground Platforms' Survivability during
Ground Force Maneuver Operations Tng Chung Siong (DSTA)

Expanded Kill Chain Analysis of Manned Unmanned Teaming for Future
Strike Operations Lee Joong Yang (Air Force)

Image-aided Inertial Navigation System Png Gek Chye Jason (Air Force)

Limitations of sole Passive Armour protection on survivability of Land
Systems for Defensive Operations in an Urban Scenario Goh Wei Jun (DSTA)

Logistics Supply of a Distributed Air Wing Ong Chee Siong (DSTA)

Making a good group decision (low Risk) in Singapore under an
environment that has time and cost constraints Loo Sok Hiang Candy
(ST Kinetics)

Mobility and Cloud – Operating in Intermittent, Austere Network
Conditions Wee Toon Joo (DSO) & Eldine Ling Yu Xian (DSTA)

Radiowave propagation in foliage Ng Yeow Chong Daniel (ST Electronics)

Shipboard Calibration Enhancements Tan Min Yan (ST Electronics)

Suitability of adding composite liner to fuel tanks as a damage reduction
technique to hydrodynamic ram effect Yang Kangjie Roy (ST Aerospace)

The effects of munitions on target Tan Choon Ming Martin (ST Aerospace)

Transient dynamic response and failure analysis of sandwich composite
structures under cyclic loading with fluid stucture interaction Teo Hui Fen
(ST Marine)

Using Twitter to predict the level of Influenze activity in the United States
Ng Kok Wah (ST Electronics)

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