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Traditional ultrasonic testing system has fixed focus, which is burdensome for layer inspection of welds because different layer needs different steering angle and focus ultrasonic beam to inspect. Ultrasonic phased array testing instrument can electronically steer and focus the transmission ultrasonic beams. This ability makes it very advantageous in automatic nondestructive testing in industrial...
An automatic ultrasonic phased array inspection system used for nondestructive testing (NDT) of pipeline girth weld is developed. The linear phased array transducer is optimized by numerical analysis based on a mathematical model. Then hardware and software designs of the system are presented, realizing dynamically focusing in the detection area. A series of technological difficulties are solved....
This paper presents a preliminary study of the chaotic behavior of servo-flap mid-span bending of a four-blade helicopter during hover, low and high-speed forward flights. The servo-flap vibratory measurement was used to create state vectors in a multidimensional space through time-delay embedding, and the trajectory of state vectors in the reconstruction state space was quantified using the correlation...
Model-based testing of state based systems is known to be able to spot non-conformance issues. However, up to half of these issues appear to be errors in the model rather than in the system under test. Errors in the specification at least hamper the prompt delivery of the software, so it is worth while to invest in the quality of the specification. Worse, errors in the specification that are also...
From the users' point of view, resource management schemes may be considered as an abstract data type. An abstract specification of such schemes using axioms holding in partial algebras and relatively distributed implementations (expressed as CSP programs) are given and analyzed. Then the idea of probabilistic implementation of guard scheduling is suggested, which allows completely distributed symmetric...
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