Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1978-08-22
1979-10-23
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
100 99, G01N 332
Patent
active
041716469
ABSTRACT:
A load monitoring system for monitoring loads that are cyclicaly applied to a force carrying member is disclosed. The load monitoring system comprises a transducer for sensing the loads exerted and a differential load monitoring circuit which receives the transducer signals, generates a normal load reference signal relating to previous load signals received and compares the normal load reference signal to the present load signal to determine when the present load exceeds the previous load by a predetermined amount for successive cycles of operation. The differential load monitoring circuit also includes an inhibit circuit which, during initial start-up of the cyclical load serves to inhibit the operation of the differential load monitoring circuit until such time as the normal load reference signals can be established.
Furthermore, an absolute load monitoring circuit is provided which detects when the loads in the force carrying member have approached the capacity of the force carrying member or any predetermined maximum load.
REFERENCES:
patent: 3930248 (1975-12-01), Keller
patent: 4116050 (1978-09-01), Tanahashi et al.
Dybel Frank R.
Dybel William P.
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