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Keywords: data acquisition
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2010
ISBN: 978-0-8031-7505-1
... In hygrothermal measurements a variety of sensors and data acquisition systems are used. Measurement uncertainty is always associated with the experimental work conducted using these devices. Although uncertainty analysis methodology has been well established, performing an uncertainty analysis...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2890-8
ISBN: 978-0-8031-2890-3
... The reduction in cost of large data acquisition systems and the ease of taking data has encouraged analysts to demand more and more data from full-scale structural tests. However, this can lead to excessive data storage requirements. Furthermore, the amount of data can sometimes result in data...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2890-8
ISBN: 978-0-8031-2890-3
... An automated data acquisition system has been developed that can be used as an independent watchdog to monitor the loads applied during a fatigue test. An algorithm to perform peak-picking based on a quadratic least squares approach has been shown to yield peak/valley magnitudes to within 1...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1999
ISBN-10: 0-8031-2493-7
ISBN: 978-0-8031-2493-6
... geophones, and directly recorded and processed by an automated computer data acquisition system. This data acquisition system includes a notebook computer, a PCMCIA data acquisition card, and “virtual instrument” programs developed in the LabView Window environment. The appearance and operation...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1999
ISBN-10: 0-8031-2604-2
ISBN: 978-0-8031-2604-6
... ability to estimate the anticipated ultimate settlement of an organic soil deposit given the loading conditions and the moisture or organic content. Also incorporated in the DMSOS is a quality control system that utilizes computerized data acquisition/data management techniques in order to evaluate...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2416-3
ISBN: 978-0-8031-2416-5
... acquisition system for strain measurement is described. The system involves a dedicated data acquisition system installed at each gage or rosette that performs bridge excitation and completion, regular sampling, and monitors trend information. A digital communications network is used to allow each gage...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2416-3
ISBN: 978-0-8031-2416-5
... An attempt is made to track fatigue crack growth through cycle-by-cycle compliance estimates. The measurements are performed using continuous 16-bit data acquisition with multi-sample data averaging to reduce the influence of signal noise. With appropriate transducer ranging and data averaging...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2045-1
ISBN: 978-0-8031-2045-7
... in these tests. The phasing relationships between the mechanical strain waveforms and the temperature and axial strain waveforms were used to define a set of four axial-torsional, thermomechanical fatigue (AT-TMF) tests. Real-time test control (three channels) and data acquisition (a minimum of seven channels...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1994
ISBN-10: 0-8031-1985-2
ISBN: 978-0-8031-1985-7
... information management will be enhanced, thus allowing for greater productivity in the test laboratory. materials testing test automation controls data acquisition historical survey fatigue (materials) fracture (materials) data analysis testing methods Arthur A. Braun t A Historical Overview...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1994
ISBN-10: 0-8031-1985-2
ISBN: 978-0-8031-1985-7
..., the ability to interface and communicate with computers easily makes it possible to perform not only realistic but also very complex control and data acquisition tasks. However, the software required to define these complex tasks and communicate with digital controllers is demanding. The development...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1994
ISBN-10: 0-8031-1985-2
ISBN: 978-0-8031-1985-7
..., is also given. The integration of the load control and multichannel data acquisition systems is described. By taking and automatically checking data on specific load cycles on a continuous basis throughout the test, it was possible to get immediate notification of any structural changes that occurred...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1994
ISBN-10: 0-8031-1985-2
ISBN: 978-0-8031-1985-7
... crack growth rainflow method load spectra bus structures loading histories data acquisition fracture (materials) test automation testing methods data analysis Manuel Moreira de Freitas, ~Nuno Mendes Maia, 1Jdlio Montalvao e Silva, l and Joao Duarte Silva 1 Applying Contemporary Life...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1994
ISBN-10: 0-8031-1985-2
ISBN: 978-0-8031-1985-7
... improved facility was then set up, and the performance was improved by the use of a Macintosh with an advanced software package. thermal-mechanical fatigue data acquisition test automation superalloys cyclic stress-strain behavior fracture (materials) fatigue (materials) testing methods data...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1994
ISBN-10: 0-8031-1985-2
ISBN: 978-0-8031-1985-7
... (FCGR) curves in near-threshold regime for ASTROLOY at 20 and 400°C under ultrasonic fatigue testing are published. ultrasonic fatigue vibratory fatigue high-cycle fatigue automation automated fatigue testing data acquisition computer control system test automation fracture (materials...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1462-1
ISBN: 978-0-8031-1462-3
... D4750 “Standard Test Method for Determining Subsurface Liquid Levels in a Borehole or Monitoring Well (Observation Well).” ground water water level monitoring wells data acquisition Gary N. Durham, I Tom G. Bumala 2 USING VIBRATION STRIP TRANSDUCERS FOR MEASURING WATER LEVELS IN MONITORING...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1991
ISBN-10: 0-8031-1389-7
ISBN: 978-0-8031-1389-3
... Results are presented which show that it is possible to detect crack growth and crack presence in airframe components during flight. To accomplish this, a data acquisition system has been developed specifically for in-flight applications. It is shown that crack advance of less than 1 mm 2...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1990
ISBN-10: 0-8031-1401-X
ISBN: 978-0-8031-1401-2
... Automated data acquisition is a necessity for characterizing composite materials due to the nonlinearities associated with matrix-dominated properties and measurement of multiple strains. A low-cost data acquisition system based on a Zenith 286 PC-compatible computer has been developed...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1990
ISBN-10: 0-8031-1401-X
ISBN: 978-0-8031-1401-2
... to specifying a materials test include: static and dynamic control mode switching, enabling multimode test control; dynamic alteration of the control waveform based upon events occurring in the response variables; precise control over the nature of both command waveform generation and data acquisition...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1990
ISBN-10: 0-8031-1401-X
ISBN: 978-0-8031-1401-2
... A computer program was developed for data acquisition and control of axial-torsional fatigue experiments at NASA-Lewis Research Center. The multitasked, interrupt-driven program was written in PASCAL and assembler. This program is capable of dual-channel control and six-channel data acquisition...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1989
ISBN-10: 0-8031-1185-1
ISBN: 978-0-8031-1185-1
... fatigue (materials) load histories data acquisition variable amplitude metals stress (materials) strain (materials) E Albrecht Conle, 1 Thomas R. Oxland, 2 Dana Wurtz, 2 and Timothy H. Topper2 Tracking Time in Service Histories for Multiaxis Fatigue Problems REFERENCEA Conle, E A., Oxland, T. R...