Reliability prediction of a trajectory verification system

Čukić, Bojan; Chakravarthy, D. Gowtham; McCaugherty, D.

doi:10.1109/asset.1998.688235

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…To establish a failure rate of less than • Reliability estimation depends upon the ability to closely approximate/predict the operational profile of the field use. [41] Despite these potential problems, a strong theoretical background of sampling theory is the basis for choosing the input domain approach to assessing DOLILU II. [24].…”

Section: Statistical Assessment Methodsmentioning

confidence: 99%

Assessment of a Space Shuttle trajectory evaluation system (DOLILU II)

Chakravarthy¹

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DOLILU II is a ground control system that generates space shuttle's launch trajectories, first stage guidance commands and verifies whether the generated trajectories are safe for the flight. It is a safety critical system and a high degree of confidence in its safety and reliability must be gained through assessment. We addressed three issues related to its safety and reliability assessment. We developed a reliability assessment framework for DOLILU II system. We proposed techniques to speed up test case execution and designed methodologies for the generation of input conditions needed to test the system. We used a Bayesian statistical framework for reliability assessment. Bayesian statistics uses knowledge about the system to be incorporated into the reliability model before testing. DOLILU II has been operational for nearly five years. We use this information when developing the reliability model. This information is introduced in the form of prior beliefs. DOLILU II system requires an average time of 30 minutes for each test run. This translates into a large time period required for testing to demonstrate that DOLILU II exhibits the required failure rate. Vertical slicing, a semantic transformation technique, is used to prove the possibility of parallel execution and enhance each test case execution. DOLILU II is an on-demand system. Many test trajectories are needed for its assessment. Regression methods were used to develop models for the generation of input data.

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Section: Statistical Assessment Methodsmentioning

confidence: 99%

Assessment of a Space Shuttle trajectory evaluation system (DOLILU II)

Chakravarthy¹

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“…The envelopes are usually derived from previous experience (experience envelopes), and known system constraints (system envelopes). If any of the system constraint rules is violated, the violation must be reported and investigated, potentially leading to dismissal in the flight qualification process and redesign [9,10]. Manual development of test cases needed for this type of system assessment is tedious, time consuming and expensive.…”

Section: Introductionmentioning

confidence: 99%

Regressive model approach to the generation of test trajectories

Taylor

Čukić

Proceedings 3rd IEEE Symposium on Application-Specific Systems and Software Engineering Technology

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One aspect of system safety assurance is the application of large test sets. To aid in the development of test cases, researchers have investigated automated test generation systems which decrease the time and cost of acquiring new tests. Many automated systems currently exist, but few address the generation of trajectories of data.A trajectory is defined as a series of data points with each point relying upon the state of the system and previous point values.Examples of trajectories include an airplane's flight path or data describing a nuclear reaction.This paper describes an original approach to test trajectory generation using statistical regression models. An existing small set of trajectories is utilized to build regressive models. Then, the independent variables of the model can be perturbed, providing the basis for the use of the regressive model in the generation of new trajectories. A case study has been conducted within the scope of testing the sensor failure detection, identification, and accommodation (SFDIA) flight control scheme. We report and evaluate the results of this case study.

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Reliability prediction of a trajectory verification system

Cited by 2 publications

References 7 publications

Assessment of a Space Shuttle trajectory evaluation system (DOLILU II)

Assessment of a Space Shuttle trajectory evaluation system (DOLILU II)

Regressive model approach to the generation of test trajectories

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