METHOD OF MODELLING THE EFFECT OF A FAULT ON THE BEHAVIOUR OF A SYSTEM
First Claim
1. A method of modelling the effect of a fault on the behaviour of a system, comprising:
- (a) providing variable in a functional model of a system, wherein setting a variable to true injects a specified fault and wherein setting the variable to false causes the model to operate as if the fault is not present;
(b) setting a variable to true to modify the functional model to specify a fault in the system;
(c) running the functional model in accordance with a test, the test having an input and an expected output, the input defining the value of at least one input variable over a period of time and the expected output defining the expected value of at least one output variable over the period of time;
(d) the functional model calculating, in dependence on the value of the input variable defined by the input, a modelled output comprising the modelled value of the at least one output variable over the period of time; and
(e) comparing the modelled output with the expected output to determine a severity score for the fault based on the difference between the modelled output and the expected output.
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Abstract
A method of modelling the effect of a fault on the behaviour of a system. The method comprises modifying a functional model of a system to specify a fault in the system; running the model in accordance with a test, the test having an input and an expected output, the input defining the value of a least one input variable over a period of time and the expected output defining the expected value of at least one output variable over the period of time; the functional model calculating, in dependence on the value of the input variable defined by the input, a modelled output comprising the modelled value of the output variable over the period of time; and comparing the modelled output with the expected output to determine a severity score for the fault based on the difference between the modelled output and the expected output.
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Citations
19 Claims
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1. A method of modelling the effect of a fault on the behaviour of a system, comprising:
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(a) providing variable in a functional model of a system, wherein setting a variable to true injects a specified fault and wherein setting the variable to false causes the model to operate as if the fault is not present; (b) setting a variable to true to modify the functional model to specify a fault in the system; (c) running the functional model in accordance with a test, the test having an input and an expected output, the input defining the value of at least one input variable over a period of time and the expected output defining the expected value of at least one output variable over the period of time; (d) the functional model calculating, in dependence on the value of the input variable defined by the input, a modelled output comprising the modelled value of the at least one output variable over the period of time; and (e) comparing the modelled output with the expected output to determine a severity score for the fault based on the difference between the modelled output and the expected output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19)
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17. A carrier medium comprising the computer program of claim 17.
Specification