Do you need to perform acceleration testing of your military products or systems for specific platforms?

Acceleration, as addressed in MIL-STD-810G Method 513.6 (Department of Defense, 2009), is a load factor (inertial load or “g” load) that is applied slowly enough and held steady for a period of time such that the materiel has sufficient time to fully distribute the resulting internal loads to all critical joints and components.

The common methods used to expose equipment to a sustained acceleration load are centrifuge and track/rocket-powered-sled testing.

Acceleration and Shock Tests - Sled Testing. MIL-STD-810H. Sled Testing. Difference beween Shock and Acceleration.

However, both methods impose limitations on AE equipment testing. For example, the costs required and the scheduling, planning, and coordination phases associated with the use of these types of test
facilities are often prohibitive. In some cases, centrifuges and track/rocket sleds may limit the orientations at which the test article can be mounted for testing. To maintain validity, all AE devices are tested under the same mounting configuration as intended for operational use. Finally, due to the often expensive and delicate nature of medical devices, insufficient inventories often prevent the use of these tests due to their somewhat destructive nature.

Because of the difficulties associated with physical dynamic testing, the ATB team initially turned to Finite Element Analysis (FEA) as the method of choice for meeting acceleration test requirements.

Recent technological advances in microcomputing and higher resolution graphics capabilities allowed complex systems to be modeled and simulated for both static and dynamic tests.

The FEA techniques were already used by others for various aircraft structures and devices. For example, Foster and Sarwade (2005) performed an FEA of a structure that attached medical devices to a litter. This structure was later approved as STF. Continuing on the same theme, Lawrence, Fasanella, Tabiei, Brinkley, and Shemwell (2008) studied a crash test dummy model for NASA’s Orion
crew module landings using FEA. Viisoreanu, Rutman, and Cassatt (1999) reported their findings for the analysis of the aircraft cargo net barrier using FEA. Furthermore, Motevalli and Noureddine (1998)
used an FEA model of a fuselage section to simulate the aircraft cabin environment in air turbulence. These and similar studies demonstrated the successful use of the FEA method to verify requirements
by analysis for an acceleration test.

MIL-STD-810H Training. Acceleration Testing. Aircraft Systems. RTCA-DO-160. Crash Hazard.

Given the costs associated with dynamic testing, the ATB originally envisioned using the FEA method to alleviate budget and inventory concerns. To test this theory, the ATB employed FEA for testing various AE structures to meet the acceleration requirements and found some aspects of this method to be cost- and time-prohibitive.

Lessons learned from these studies are provided in the case-studies section. The various types of analysis and test methods raise questions as to what the correct decision process is for selecting the most appropriate method for STF testing of AE equipment.

RTCA-DO-160 Fire and Flammability Training. MIL-STD-810H. Risks and Assessment Techniques.

The authors of this article describe the process developed and employed by the ATB for the acceleration testing of AE equipment since June 2008.

The ATB’s process has proven to be well suited for identifying the most appropriate test method—one that not only represents the most appropriate and effective test method, but also minimizes the use of available resources. This process includes testing both structurally simple and complex equipment and successfully introducing the use of the Equivalent Load Testing (ELT) method, which permits
the use of alternative testing approaches, such as pull testing and tensile testing.

Use ERS Exercise Workbooks and Manuals in your Operational and Management Level Trainings: Students Love it!

GDS Ship Engine Room Simulator (Ship ERS or SERS™)
User Manuals and Exercise Workbooks

Line Up - ME Fresh Water Cooling System IMO STCW 2010 Training, IMO Model Course 2.07. Prevent Maritime Accidents. Training is Important. Marine Engineering Training Products, Ship Engine Room Simulator, Ship ERS or simply the SERS, provided by GDS Engineering R&D.

ERS User Manuals Set for Meeting IMO Model Course 2.07 (2017 Ed.) Exercise Objectives and STCW 2010 Training Requirements, Supplemented with Root Cause Analysis Exercises

SERS™ is provided with a total of seven (7) user manuals, student exercise workbooks, and documents as complementary to the training practices. All these documents are supplied with a license purchase.

SERS User Manual Vol I (Software Description) describes the SERS software with the SERS Graphical User Interface (GUI) Panels accessed from the SERS Main Graphical User Interface (GUI) Panel.

SERS User Manual Volume II (Engine Room Operations) includes the operational instructions on how to operate the engine room systems and machinery using the SERS. The training institutions can directly use the contents of this manual in their training procedures. There are also exercises included for use by the trainees for reporting.

SERS User Manual Vol III (Installation & Configuration) describes the installation and the configuration of the software and hardware items. Using this manual, SERS can be configured to run as a Distributed System and the touch screen hardware panels can be assigned to desired GUI panels using the configuration files.

SERS User Manual Volume IV (Instructor’s Manual) includes guides, information, and additional exercise tips for the instructors to utilize SERS in their trainings according to a specific training objective.

SERS Philosophy Document provides how SERS may be used in a curricula or in engine room simulator training programs. It provides guides for selecting the configuration of the SERS according to the training objectives.

Student Exercise Workbooks per IMO Model Course 2.07 (2017 Version)

Student Exercise Workbook, Volume I: We are already using the simulator in our own training programs and developed Volume I with exercies that meets each objectives of the IMO Model Course 2.07. Volume I exercises includes the Engine Room Operational Level training objectives.

Student Exercise Workbook,Volume II: Volume II exercises includes the Engine Room Management Level training objectives in accordance with IMO Model Course 2.07.

Using the SERS™ document set in classroom study also promotes the real-world engine room best work practices of using manuals in operation and management of the engine room machinery and systems.
Visit the Ship ERS ( SERS™) product page for more information