초록 ▼

An electrical input signal representative of the existing operating state of a rotating bladed disk or other rotating member is classified into one of a plurality of predetermined operating states and a sequence detector is employed for detecting the occurrence of one of a plurality of possible pred

An electrical input signal representative of the existing operating state of a rotating bladed disk or other rotating member is classified into one of a plurality of predetermined operating states and a sequence detector is employed for detecting the occurrence of one of a plurality of possible predetermined sequences of such operating states. Predetermined fixed damage coefficients are then correlated with respectively corresponding detected predetermined sequences of operating states and accumulated with other similarly selected damage coefficients so as to provide a cumulative indication of low cycle fatigue damage done to the rotating member over its past history of experienced operating state sequences.

대표청구항 ▼

Apparatus for detecting and indicating cumulative low cycle fatigue damage done to a rotating member due to the sequential passage of said member through different operating states, said apparatus comprising: input means for providing an electrical input signal representative of the existing operati

Apparatus for detecting and indicating cumulative low cycle fatigue damage done to a rotating member due to the sequential passage of said member through different operating states, said apparatus comprising: input means for providing an electrical input signal representative of the existing operating state of said rotating member. classification means connected to receive said input signal for detecting which of a plurality of predetermined operating states is then in occurrence and for producing a respectively corresponding output in response to detection of each different operating state, sequence detection means for receiving the output from said classification means and for detecting which of a plurality of predetermined sequences of operating states have occurred and for producing a respectively corresponding output in response to detection of each different predetermined sequence of operating states, damage coefficient determining and correlation means operatively connected to receive the output from said sequence detection means for defining a predetermined constant numbEr of each said predetermined plurality of sequences and for respectively associating each of said constant numbers and said sequences, and acccumulator means connected to the output of the damage coefficient determining and correlation means for receiving therefrom electrical signals representing the constant number corresponding to the detected predetermined sequence of operating states and to cumulatively add and totalize such constant numbers thereby providing an indication of cumulative low cycle fatigue damage done to the rotating member.