Abstract: Monitoring the translations of points on structures andmachinery is an important procedure in industrialengineering. Two low-cost translation monitoringsystems using electronic tachometers have beendeveloped and tested at the University of Calgary. Thesystems use both network and nonnetwork (direct)methods to measure relative point translations withsubmillimeter accuracy. The systems are simple andefficient, requiring only one observer using normalsurveying instruments. Two case studies undertaken bythe authors are described, demonstrating applicationsof the new monitoring systems. The first study is themeasurement of thermal growth of a rotating gasturbine/compressor system during startup. The thermalmovements were measured and found to be consistent withtheir expected behavior to a precision of 0.2 mm. Thesecond study is the measurement of point displacementson a concrete structure and test frame during a loadtest at the University's Civil Engineering StructuresLab. The translations measured agree with thetheoretical values from a finite element analysis. !14
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