Monday, March 13, 2017

Fwd: Aviation Week Article - a New Space Paradigm is BornExplore the Connected World



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From: "Info@Launchspace.com" <info@launchspace.com>
Date: March 13, 2017 at 8:04:10 AM CDT
To: Bobbygmartin1938@gmail.com
Subject: Aviation Week Article - a New Space Paradigm is BornExplore the Connected World
Reply-To: info@launchspace.com
         
Aviation Week Article - a New Space Paradigm Is Born
By Launchspace Staff Writers
Bethesda, MD - Last week's issue of Aviation Week and Space Technology included a story on how the space debris problem is being approached from two directions. There have been dozens of suggestions, ideas and proposals that call for the removal of large debris objects such as expired upper stages and satellites, appendages such as solar arrays and other large free-floating structures that once had a purpose. Most debris removal proponents feel that the debris threat is the possible collision between operational satellites and these debris items. However, most agree that the individual removal of large objects is extremely complex and expensive. But, the history of known collisions indicates that such events rarely happen. Most debris damage occurs when small debris pieces hit satellites. We do not know exactly how often this happens, although data has been gathered over the decades based on recovered satellites and a number focused experiments designed to measure the density of untrackable objects. These data indicate that it is the small and untracked items that cause the most damage.
As it turns out, it is the small, undetectable debris that has created the major threat to satellites in low-Earth orbits. In fact, there are two distinct types of threats to satellites and constellations. First, there is the direct collision possibility that can result in a process of satellite disintegration over a period of time. In addition, the small debris items are thought to be increasing in density to the point that it could clog low orbits, preventing any satellite from operating in the near-Earth zone of space. It appears that one day soon the small debris population will have to be reduced. However, this debris is too small to be individually removed. So, the other direction for debris cleanup is the wholesale collection of small objects.
No serious approach to wholesale collection has been suggested, until now. The implications are overwhelming. If wholesale collection is possible, this approach may also change the way we use space:
Positive environmental control of near-Earth space
Improved safety for satellites and constellations
Enabled space traffic management
National security enhancements
New commercial applications      
Thus, the underlying mission of debris cleanup may well change the paradigm for space usage. Launchspace Technologies Corporation is spearheading the wholesale collection technology for low-Earth orbits. Important findings will be exposed at the 33rd Space Symposium in early April. Stay tuned.
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Special Course offering Available at Your Site
Space Vehicle Mechanisms: Elements of Successful Design
DURATION: THREE DAYS
LOCATION: AT YOUR FACILITY
LAUNCHSPACE COURSE NO.: 1135
 
COURSE SUMMARY
This course explores the technologies required for the successful design of moving mechanical assemblies in the space environment and offers a detailed look at many of the key components common to most mechanisms, such as ball bearings, motors and feedback devices. With this background, the high-performance materials required for operation in space are reviewed, emphasizing compatibility with the space environment and offering some background in the metallurgy, chemistry, and fabrication of those materials. Examples of some of the many types of mechanism will be included for illustration. In addition, the mechanisms relationship and interface with other vehicle systems will be explored, as a mechanism usually becomes an important part of the vehicles structural, thermal, contamination, survivability, and pointing subsystems. The course includes design and analysis examples to demonstrate principles involved in understanding how mechanisms should work, and how design margins should be evaluated during the evolution of a program. Finally, some important underlying techniques, such as reliability analysis and digital simulation, are covered.
 
COURSE MATERIALS:
Include the handbook Space Vehicle Mechanisms: Elements of Successful Design, edited by P.L. Conley, plus notes and reference materials.
 
WHO SHOULD ATTEND:
This course is intended for mechanisms engineers who wish to expand their knowledge and for system engineers and program managers who need a working knowledge of mechanism design and application.
 
WHAT YOU WILL LEARN:
Understanding a mechanism requires a working knowledge of dozens of specialties, such as motors, lubrication, structural metals, and feedback devices. You will acquire this knowledge and become conversant with the many components, materials, and technologies that go into a successful design. In addition, successful application of a mechanism requires a familiarity with the various vehicle subsystems of which a mechanism is often a crucial part, such as the pointing, contamination or structural system. The design and analysis of these subsystems, and their interfaces with the mechanism, are introduced.
 
COURSE OUTLINE:
1.  Introduction.  
Overview of how all types of mechanisms are used in spacecraft.


 

2.    Pointing Subsystems. 
Design and requirements considerations common to pointing systems. High and low precision consideration for bearings, motors and feedback devices.

3.    Motors. 
Stepper motors, DC brush and brushless motor characteristics and behavior. Different motors for suitability against various mechanism applications.

4.    Feedback Devices. 
Optical encoder, inductosyn, resolver and potentiometer characteristics and precision. Selection of feedback devices for suitability against various mechanism applications.

5.    Bearings and Gears. 
Fundamentals of high-precision ball bearings and proper lubrication techniques for long life. Overview of gears with a focus on harmonic drives.

6.    Lubrication Fundamentals.
Wet and Dry Lubricants. Fundamental behavior, performance and life characteristics of liquid and dry lubricants for space. Different lubrication choices for suitability against various mechanism applications.

7.    Release Systems and Deployment Systems.
Pyrotechnic and non-pyrotechnic release mechanisms operation and characteristics. Deployment system elements and basics.

8.    Rotating Signal and Power Transfer Systems. 
Slip ring characteristics, operation and behavior.

9.    Electrical Interfaces. 
Interfaces between mechanisms and the spacecraft to give the mechanism designer insight into the implications of important interfaces.

10.  Structural Dynamics. 
Spacecraft and general structural dynamics to give the mechanism designer insight into the structural aspect of mechanisms and into interfaces with larger spacecraft structure developments.

11.  Structural Metals. 
Common structural metals for mechanisms including stainless steel, titanium, beryllium and others. Characteristics of most interest for mechanisms.  Materials for springs and bearings.

12.  Composite Materials. 
Common composite materials for mechanisms and characteristics of interest.

13.  Reliability and Simulation Techniques. 
Mechanism simulation techniques and reliability assessment methods.

14.  Contamination. 
Contamination considerations between mechanism and satellite.

15.  Radiation and Survivability. 
Radiation environment and survivability implications for the mechanisms.

 
Instructor: Bill Purdy
Bill Purdy has 22 years of hands-on experience in the space engineering field with wide-ranging involvement in both spacecraft mechanisms and systems engineering disciplines. Mr. Purdy has been one of the leaders of the space mechanism industry's transition from explosive release mechanisms to non-explosive devices. His involvement in numerous space endeavors includes key roles on over 25 successfully flown spacecraft, work on over 30 flown mechanisms including gimbals, release mechanisms, deployables and many other types of mechanisms.  As an educator and space industry consultant to both government and industry, Mr. Purdy applies this broad experience to bring out a clear understanding of the space mechanisms, definition, resolution and integration of mechanism requirements and their relationship to the overall system program success.  Mr. Purdy was the Associate Editor of the industry-standard handbook Space Vehicle Mechanisms - Elements of Successful Design and the author of the chapter on non-explosive release mechanisms.   He has published seven Aerospace Mechanisms Symposia Papers and was the 1999 winner of the Herzl Award.  Mr. Purdy holds a BSME from the University of Maryland.
  info@launchspace.com 
(202) 258-6133
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Got One of These?
Launchspace Training personnel have been providing special short courses to the space community since 1970. Early in his career, Dr. Marshall H. Kaplan realized that space professionals had limited resources in advancing their own space-related knowledge base and on-the-job training options. Over the last few decades this company has created and delivered hundreds of focused courses to thousands of engineers, managers and support personnel in the space community. All training subject matter and supporting materials are designed to increase knowledge and improve productivity associated with space technologies, systems and operations. These topics are not offered in a university setting.
Over the past 20 years, Launchspace has been offering company-specific courses that are tailored to the requirements of any given company to train its own personnel. These courses are presented on-site by experts in the particular subject areas. Such offerings have proven to be very cost-effective and efficient. Every major space organization in North America and Europe has taken advantage of Launchspace's Training programs. This includes government agencies such as NASA, USAF and several other offices of the Department of Defense.
Course topics cover almost every aspect of space flight from launch vehicle technologies to orbital mechanics to spacecraft design. Our customized courses are offered at client locations in support of mission requirements and to expand the expertise of professional staff members. In addition, a few high-demand public classes are presented for open registration at selected conference locations. Contact us to discuss a customized training program for your professionals:
  info@launchspace.com 
(202) 258-6133
See our website for a partial listing of possible course offerings
_______________________________________________________________________________________________
  
LAUNCHSPACE is an educational and consulting organization dedicated to training and continuing education for space professionals and to supporting the space community.  
We offer the largest array of customized client-site courses to government agencies and industry, and a full spectrum of technical and management expertise in support of space programs. Click on www.Launchspace.com to sign up to receive our weekly articles of timely space events and advances. Also, see our extensive catalog of course offerings. Any of these can be customized for your needs, or we can create a new course for you.
Through our training programs we have helped thousands of engineers and managers become more productive in their careers. Our courses and programs are unique and tailored to our clients' needs. We focus on critical skills in all areas of spaceflight, spacecraft and launch systems.
Our consulting activities include technical innovation, problem solving, program management, proposal development, systems engineering and litigation expertise. We have been involved with many major space programs over the past 40 years. Our experts span the full spectrum of space challenge areas. We are available to address your needs now and in the future.
Please contact us for more information about our services at info@launchspace.com
or +1.202.258.6133.  

_______________________________________________________________________________________________





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