Nondestructive evaluation of wood properties by stress wave spectral analysis

The influence of selected properties on the propagation of stress waves in wood was investigated. Waveform analysis of the stress waves was performed using spectral analysis techhniques developed for stationary random processes. Information analyzed from the stress waves included wave velocity, energy spectra, and the frequency response function. Three wood properties investigated as to their influence on stress waves propagation were grain angle, moisture content, and weight loss caused by decay. Significant relationships between grain angle and the wave properties of velocity, amplitude gain, and total gain were obtained. Significant damping of the stress waves was observed at large grain angles and moisture content values above the fiber saturation point. No significant equations were found for consistent prediction of moisture content. The results of the decay study showed that as weight loss increased, the ratio of energy of the stress wave to that input to the specimen decreased for the perpendicular to grain case. Two approaches toward prediction of wood strength were investigated. The first method employed prediction of wood properties from the stress wave spectral characteristics. Known relationships between these wood properties and strength were then utilized. The second approach involved direct correlation of the stress wave spectral properties with strength. Significant correlatlons with strength were obtained using both approaches. Application of basic results are discussed as to their applicability toward development of an [sic] nondestructive evaluatlon (NOE) procedure for wood poles used in transmission line structures

Transcutaneous measurement of blood velocity profiles and flow

A comprehensive report is presented of the application of a pulsed ultrasound Doppler velocity meter for transcutaneous measurement of time varying velocity, velocity profiles, and instantaneous flow in arteries of anaesthetized dogs. The procedure used to provide direct velocity and flow calibration using the Doppler equation is outlined. Typical transcutaneous recordings obtained from the femoral artery, abdominal aorta, and carotid artery are illustrated. The results compare favourably with data obtained by invasive means such as electromagnetic cuff flowmeters. The possibility of high resolution, non-invasive haemodynamic measurements on dogs is demonstrated and the application to conscious human subjects suggeste

Introduction to mechatronics and measurement systems

xv, 553 hlm.: 25 c

Mechatronics Lab Activities and Other Resources

This is the companion website for the textbook "Introduction to Mechatronics and Measurement Systems" by David G. Alciatore and Michael B. Histand. The web site includes a list of lab activities and video demonstrations, as well as other resources

Introduction to mechatronics and measurement systems

xxi, 466 hlm. : ilus. ; tab. ; 23 cm

Mechatronics Lab Activities and Other Resources

This is the companion website for the textbook "Introduction to Mechatronics and Measurement Systems" by David G. Alciatore and Michael B. Histand. It includes a list of lab activities and video demonstrations, as well as other resources

Introduction to Mechatronics and Measurement Systems

xxiii+509hlm.;23c

Introduction to mechatronics and measurement systems, 4th ed./ Alciatore

xv, 553 hal.: ill.; 24 cm