PROBLEM TO BE SOLVED: To reduce computational complexity in minimum cut set (MCS) evaluation for a tree of a failure including k/n gates and to improve reliability in a result of the MCS evaluation for the tree of the failure.SOLUTION: A system for evaluating minimum cut sets (MCSs) of a tree of a failure is provided. The evaluation system includes composite k/n gate simplification means which reduces composite k/n gates into basic k/n gates on the basis of a collection of simplification rules, and basic k/n gate minimization means which reduces the basic k/n gates into minimum k/n gates on the basis of a collection of minimization rules.

Method and system for efficiently evaluating minimum cut set of tree of failure

PROBLEM TO BE SOLVED: To provide a method for producing mechanical or electronic component, the method enabling suppression of failure occurrence while maintaining a changed certain dimension of a mechanical or electronic component in a case where a failure occurs after the dimension is changed.SOLUTION: A method includes the steps of: identifying a failure occurring when a mechanical or electronic component is produced in a case where one of dimensions of the mechanical or electronic component is changed; mapping the identified failure to a lower-level event causing the failure by means of a fault tree analysis; obtaining, from the lower-level event, a group of physical quantities except for a physical quantity corresponding to a dimension related to the change; changing at least one of the group of physical quantities in a direction of reducing the failure; and producing, using the changed physical quantity, the mechanical or electronic component for which the one of dimensions has been changed.

Method for producing mechanical or electronic component

PROBLEM TO BE SOLVED: To provide a technique that specifies an event having mutual dependency and including a coincidental factor in a precariousness scenario, and assists a calculation of accurate occurence probability with respect to a disaster event.SOLUTION: An FT calculation assisting program is configured to make a computer execute the steps of: extracting a name of a constituent element and an attribute thereof in which at least an operation is performed in responce to an occurence event from the scenario; searching for all constituent elements in which the operation is performed in responce to the occurence event included in the scenario on the basis of the extracted name and attribute; as a retrieved result, when the same name and attribute as the extracted name and attribute exist, specifying the constituent element of the same name and attribute as a common factor event; calculating a safety evaluation index of the scenario leading to a disaster event of a process on the basis of the specified common factor event; and outputting the calculated safety evaluation index of the scenario leading to the disaster event of the process.

Ft calculation assisting program, ft calculation assisting method and ft calculation assisting device

An electric vehicle safety assessment method, comprising: S1, constructing a safety tree, wherein the safety tree comprises a plurality of safety failure lower-level events, safety failure intermediate events, safety failure top-level events, logical causality between the safety failure lower-level events, the safety failure intermediate events, and the safety failure top-level events, and a degree of importance to safety of the events; S2, calculating, according to the safety tree, a system failure risk level and/or a system safety factor of an electric vehicle; and S3, performing safety maintenance and management of the electric vehicle on the basis of the system failure risk level and/or the system safety factor.

Electric vehicle safety assessment method and electric vehicle

The invention discloses a vehicle fault detection method and device and belongs to the field of automatic control The method comprises the following steps: detecting whether fault information sent by a first electronic device is received within a first preset time, wherein the first electronic device is any electronic device in a vehicle; and when the fault information sent by the first electronic device is not received within the first preset time, deleting historical diagnostic trouble codes corresponding to the first electronic device stored in the vehicle By deleting the historical diagnostic trouble codes corresponding to any electronic device stored in the vehicle, the problem of low maintenance efficiency is solved; and the method and device are used for detecting vehicle faults

Vehicle fault detection method and device

PROBLEM TO BE SOLVED: To solve the problem of a fault diagnosis support device wherein a standard FT (fault tree) and a case FT are handled as different kinds so that addition or deletion of nodes to or from the case FT, if any, cannot be automatically reflected on the standard FT SOLUTION: A unique ID is added to a common factor between the standard FT and the case FT so that the standard FT and the case FT are handled as FTs of the same type, and so that addition or deletion of nodes to or from the case FT is automatically reflected on the standard FT COPYRIGHT: (C)2005,JPO&NCIPI

Fault diagnosis support device

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Fault diagnosis support device