|7:30 am Registration
Tutorial Co-Chair: Hadi Navid, The Johns Hopkins University -
Tutorial Co-Chair: Nabil Copty, SIERRA LOBO, Inc.
Session 1 - Vibration Control System
Instructor: Gary Marraccini
Whether it is new or experienced personnel in almost all Test Laboratories I visit during the year, I find that the understanding of the vibration controller(s) used in the laboratory could be better. Often the "modus operandi" is "figure it out and get the report done!" This tutorial will focus on the vibration controller in the vibration laboratory, including the sensor, and where necessary the shaker system. The discussion will cover random vibration topics such as degrees of freedom (DOF), resolution, and control strategy (average, maximum, minimum) as well as sine vibration control channel processing (unfiltered, usually called broadband root mean square [RMS] or peak and filtered, usually called tracking filter), sweep rate, and error correction or compression. Classical Shock and Shock Synthesis will be reviewed for waveform types and levels with respect to the displacements and acceleration required for performance on most common Electrodynamic shaker systems. The attendee will leave the session with a better understanding of existing control and analysis systems and be able to perform elementary pre-test calculations to determine if the test specification will run on the laboratory excitation systems. This tutorial is intended as an introductory and review session for all.
Session 2 - Helium Refrigeration System
Instructor: John P. Barrett, P.E.
This session is intended as both an introduction for the new user, as well as an update for the familiar test engineer or technician, this tutorial covers the essentials associated with the design, operation and maintenance of a helium refrigeration system in support of space simulation chamber tests.
This tutorial will cover topics including:
- Helium as a refrigerant
- Review of the thermodynamic cycles of the helium liquefier and refrigerator
- System design and fabrication of the major system components
- Instrumentation and control systems
- Safe system operation and maintenance
- Operational lessons and how to avoid trouble
Session 3 - Data Acquisition Systems
Instructors: Leo Monteiro
In today's test facilities there are many challenges on acquiring data from Space Simulation Laboratory test apparatus (eg. hardware selection, developing software, device communication protocols, networks, etc.). This tutorial is tailored to engineers or technicians looking to obtain a general understanding of data acquisition (DAQ) equipment and software. The instructor will cover the differences of commercially available DAQ equipment and software programming techniques. There will be a discussion on acquiring data from PLCs to DAQ systems, as well as different communication protocols. There will also be discussions of methods for displaying and storing data. This tutorial is intended as an introductory overview.
Session 4 - Force Limited Vibration Testing
Instructor: Bill Zwolinski
Kistler Instrument Corporation
Force limited Vibration is a commonly used method for the testing of flight hardware. This tutorial will review basic principles of Piezoelectric Theory including typical properties, time constant and quasi-static operation. Piezoelectric Force sensor principles of operation and practical considerations will be reviewed including pre-loading, force links, frequency response and expected accuracy of associated measuring chains. These concepts will be extended to typical Force Limited Vibration measuring chains consisting of 3-component force sensors, cabling, Signal Conditioning and Summing/Scaling to measure the forces and moments.
Question-Answer Discussions to Follow Each Session