Download Adjunct Missile Seeker Deployment Mechanism

Adjunct Missile Seeker
Deployment Mechanism
Concept Review
University of Arizona
Raytheon Missile Systems
Team Members
• Thomas Jefferson
– Material Sciences
• Ryan Moore
– Mechanical Engineering
• Philip Pierson
– Optical Sciences
• Scott Nielsen
– Optical Sciences
• Karl Heiman
– Aerospace Engineering
• David Kraemer
– Electrical Engineering
Outline
•
•
•
•
•
•
Problem Statement
Customer Needs
Design Constraints
Design Ideas
Concept Selection
Plan of Action
Problem Statement
• Design an Adjunct Seeker Deployment
Mechanism (ASDM) that will deploy an
Infrared (IR) seeker in the final stages of
missile flight.
• Mechanism must:
– Minimize changes to existing airframe
– Minimize the drag on the missile
– Maximize the field of regard (FOR) of the
seeker
Customer Needs I
• Mitigate new threats
• Utilize existing components
– Optimized for different system
• Minimize changes to proven systems
– Autopilot
– Airframe
• Identify trades and risks of proposed
design
• Implement a reliable design
Customer Needs II
• Use an existing IR Seeker
• Minimize System Weight and Volume
• Survive Thermal Environment
– Storage
– Flight
• Rapid Deployment
Design Space
Circuit Cards
Design Constraints
Functional Requirements
Category
System Sizing
IR Seeker
Specifications
Storage
Conditions
Flight
Conditions
Deployment
Characteristics
Req't
#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
Total Volume
Card Volume
System Weight w/o Cards
IR Seeker
Weight
Window / Dome
Field of Regard
Storage Life
Storage Temperature
Launch Temperature
Survive Flight Speed
Total Flight Time
Mechanical Shock
Deployment Time
Value
<8in diameter x 4in length
Half of total volume (unusable)
2 lbs
One of three off the shelf components
1 lbs
transparent for 3-6μm wavelengths
Maintain ±35° in azimuth and elevation
>10 years
-65°C - 85°C
-45°C - 60°C
Mach 3
~25s
40g for 2-3ms with 1/2 sine wave pulse
<500ms
Design Components
• Deployment method
– Must meet deployment time restrictions
• Seeker orientation
– Target must be visible until impact
• Door mechanism
– Affects previous design characteristics
Deployment Mechanism
• pivots at back of seeker
• slides into cavity
• directional hooks
• scissor drive
• lateral slide drive track system
• lateral pivot arm
• ramp
• spring
Seeker Orientation
• angled to maximize to FOR
• sits inside of enlarged nosecone
• Normal to missile circuit cards
• seeker sits inside and looks at a
prism
• nosecone / teardrop
• external to maximize FOR
• fixed seeker to series of mirrors
• lateral to longitudinal axis
• angled to longitudinal axis
Door Mechanism
•
explodes
•
angles up w/ a foldable seal
•
domed cover that stores within missile depression
•
split door slides to sides
•
single door slides to side
•
single door slides to back
•
shaped door to facilitate tear drop
•
material that shatters with voltage or force
•
shot gun closure
•
slowly introduce into airstream to reduce shock
•
push up protective dome
•
bottom seal gasket
Concept Selection
Concept
Pros
Cons
angled to maximize to FOR
-Maximizes use of FOR
-Does maximum FOR allow
best Aero profile?
sits inside of enlarged nosecone
-Maximizes use of FOR
-Mechanical shocks from
nosecone?
-Interfere with RF Patterns.
-Change to current design
autopilot to compensate.
Normal to missile circuit cards
-Minimal use of overall
volume
-Low motion, low
deployment time
-2 of 3 seekers potentially
useless
-Does not maximize FOR
w/o additional movement
seeker sits inside and looks at a prism
-less shock to seeker
-Difficult to maximize FOR?
Seeker Orientation
Ryan Karl Thomas Scott Phil Dave Total
angled to maximize to FOR
1
1
1
1
1
0
5
sits inside of enlarged nosecone
-1
-1
-1
-1 -1
0
-5
Normal to missile cerkit cards
0
-1
0
0 -1
0
-2
seeker sits inside and looks at a prism
0
-1
0
0
0
0
-1
nosecone / teardrop
-1
-1
0
1
0
0
-1
external to maximize FOR
1
0
0
-1
0
0
0
fixed seeker to series of mirrors
0
0
-1
-1
1
0
-1
lateral to longitudinal axis
0
-1
1
1
0
0
1
angled to longitudinal axis
0
0
1
1
0
0
2
Note: This is only an example of the Selection
Process
Concept Selection I
Slide Rail System
Pros
• One direction of
Movement
• Indexed Direction
Cons
• Lubrication
required
IR Seeker
Missile
Cross-section
Slide Drive
Track System
Circuit Card
Space
Utilizes: Slide Drive System, Any Seeker, maximum
length available
Concept Selection II
Pivot Arm
Pros
• Single Motion
• Easy to Implement
Torsional
Spring?
IR Seeker
Pivot Arm
Cons
• Large Deceleration
• Large torque for
movement
Circuit Card
Space
Missile
Cross-section
Utilizes: Pivot Arm, Any Seeker, Few moving parts
Concept Selection III
Seeker Rotation
Pros
• Simple control of
movement
Door
Cut-out
Pivot Axis
Cons
• Volume for
motion
• Torsional force
required
IR Seeker
Missile
Crosssection
Circuit
Card Space
Utilizes: Seeker Rotation, Any Seeker, Few moving
parts
Plan of Action
• Next two weeks
– Flesh out design details
– Trade analysis
– Identify risks
• Next two months
– Design analysis
– Finalize design
Summary
• Evaluated our customer’s needs
• Presented rough ideas
• Eliminated ideas based on customer
needs
• Came up with our preliminary designs
Questions
?