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Novel prognostic sensors and reasoner algorithms are the core technology for detecting defects caused by accumulation of fatigue damage in electrical and mechanical systems over time. However, serious technical challenges to implementing a general health management strategy for helicopters and military aircraft still exist. For example, severe heat and vibration make it difficult to distinguish fault...
A new revision of IEEE Std 1641 has been completed and should be available before the end of the year. This standard, which provides a method of accurately defining signals and tests, has been further developed with many new improvements. The standard provides for libraries of pre-defined signals which may be re-used within a technology or project. There have been many examples of stimulus signals,...
This work presents a power electronics health monitoring test platform for assessing modern power drives and electric machines with regeneration capabilities. This versatile platform combines data acquisition of critical system signals that are used for analysis as health indicators for the overall system and individual components such as power semiconductor devices. The test platform combines hardware...
The present work shows a condition monitoring system applied to detect Fault Condition in EMA Systems. Removal of the engine hydraulic pumps requires fully-operative electrical power actuators and mastery of the flight control architecture. However, unexpected faults and lack of safety hinder the massive use of EMAs in flight control actuators and force to develop new systems and methods for supervision...
Commercial off the shelf (COTS) equipment is generally preferred because of its low acquisition costs, wider user base and implied support from the vendor. Because it is treated as a black box, however, it is often complicated to measure the testability and diagnosability of the COTS equipment and therefore its supportability is difficult to predict. While some metrics for testability, diagnosability...
This paper describes an automated microwave measurement and test systems with an emphasis on reducing overall test times. It presents as an example a measurement system for Transmit and Receive (TR) modules used in Active Electronically Scanned (AESA) radars.
Spectrum analyzers used in communication systems are traditionally modeled by a bank of filters with equally spaced frequency centers and bandwidths. This type of spectrum analyzer decomposes the input signal into basis functions that share common features such as time extent and bandwidth. Another important class of spectrum analyzers is the proportional bandwidth spectrum analyzer modeled by a bank...
This paper examines the testing and production processes used on the CASS Phase II TPS Offload Program. The CASS Phase II TPS Offload program is a US Navy acquisition to replace legacy ATE Systems using CASS (Consolidated Automated Support System) Test Stations. This provides the Navy intermediate maintenance activities an effective tool for restoring “Ready For Issue” (RFI) status for over 450 aircraft...
Test Program Set (TPS) runtime is one of the most important aspects in repair throughput. Considering the testing required to detect and isolate faults or failures and then verify repair during a typical maintenance event, the individual elements of a test program are usually executed at least twice. Any reduction in test execution time is therefore multiplied, increasing the importance of optimizing...
Modern General Purpose Automatic Test Equipment (ATE) systems are expected to provide a wide variety of functionality to meet the performance needs of both legacy as well as new Unit Under Test (UUT) Test Program Set (TPS) routines. With technologies associated with ATE systems being updated and modernized to keep pace with industry developments and UUT complexity, the sustainment of these systems...
The United States Marine Corps has recently completed a prototype of the Common Streamlined Standalone Electro-Optical Tester (Common EO). The primary goal of the design of the prototype Common EO is to provide the USMC with a tester that can perform Go/No-Go testing on a select set of electro-optical (EO) systems such as visible and infrared systems. This paper will summarize the capabilities of...
How to identify when a static pattern digital test program should be re-hosted as a dynamic pattern set on the state-of-the-art ATE is complicated. However, there are critical issues that should be evaluated when making this decision. Issues include chip models, timing parameters, drive strength, logic levels, circuit complexity, I/O pins, automated diagnostics, portability, reuse, speed, optimal...
Few industries suffer the budget and scheduling challenges caused by test instrument obsolescence as often and as severely as the military and aerospace industries. Often, the need for a given automated test system outlives the practical life of the original instruments as well as the expectation, interest, and even the availability of the original system developers. System readiness is increased...
We need to focus on the exact cause of failure and perform prognostics during the test and repair cycle. Technology must change for test/diagnosis. With the advent of more robust microcircuits we need to think outside the box when if comes to testing. If we continue to perform diagnostics in the same manner, without considering other testing philosophies, we will continue to waste time and resources.
High Performance digital subsystems have been developed over the years using a variety of proprietary and industry standard architectures such as GPIB and VXI. With the availability of high performance / high density FPGAs and analog electronics, the implementation of high performance digital functional test subsystems has now become a reality using the PXI architecture. The smaller form factor of...
System integration testing (SIT) is still relied upon for final confirmation of data link products. SIT, a costly process, is still required for most circuit card sub-assemblies because of the risk that lower level testing is either insufficient or incomplete. A description of production testing and debug is presented.
Overcoming test-equipment obsolescence is paramount in military and aerospace applications where test systems are supporting equipment with a service life of more than 20 years. However, replacing one or more obsolete instruments in a test system can have major consequences for the deployed Test Program Set (TPS). An emulation strategy can help you incorporate new test instruments to migrate from...
The introduction of EMA Systems requires the use of redundant inverters to drive the EMA and ensure reliability and safety. Redundant converters allow the implementation of fault tolerant control and high quality operation. Fault control has been implemented by means of redundant converter and fault detection system.
Particular problems can occur for frequency synthesizers under vibration and temperature. These effects will be outlined for providing margin to prevent failures. Phase noise, noise figure, and spectrum analysis tools are applied with vibration tables and thermal chambers. Particular focus is given to frequency synthesizers whose oscillators are most susceptible to environmental effects.
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