Ships and marine technology. Ship's mooring and towing fittings. Recessed bitts (steel plate type)

2020 ◽  
Keyword(s):  
Steel Plate ◽  
Marine Technology ◽  
Plate Type

scholarly journals Analysis of laser cut slots on different thickness steel plates

2021 ◽  
Author(s):  
Sergiu Constantin Olaru ◽  
Margareta Coteaţă ◽  
Gheorghe Nagîţ ◽  
Adelina Hriţuc ◽  
Oana Dodun ◽  
...  
Keyword(s):  
Laser Beam ◽  
Mathematical Models ◽  
Experimental Research ◽  
Steel Plate ◽  
Cutting Process ◽  
Steel Plates ◽  
Different Thickness ◽  
Plate Type ◽  
Machined Surfaces

One of the processes used to separate parts from plate-type workpiece is laser beam cutting. The evaluation of the quality of the machined surfaces can be performed by taking into account the influence exerted by some input factors in the cutting process on the width of the slot and on the roughness of the surfaces generated by the laser beam cutting process. The paper presents the results of experimental research performed on a steel plate type workpiece. The objective pursued was to reveal the influence exerted by several input factors of the laser beam cutting process on some output parameters of this process. Empirical mathematical models corresponding to the output parameters taken into account were established. It was possible to order the input factors in the process by taking into consideration their weight in the values of the output parameters.

Curing Strength Monitoring of Early-Age Concrete Based on Velocity of Guided Wave Using Embedded Plate-Type PZT Sensor Module

2013 ◽  
Vol 281 ◽  
pp. 645-648
Author(s):  
Ju Won Kim ◽  
Eun Seok Shin ◽  
Chang Gil Lee ◽  
Seung Hee Park ◽  
Seo Kinn Hong
Keyword(s):  
Compressive Strength ◽  
Wave Velocity ◽  
Steel Plate ◽  
Piezoelectric Sensor ◽  
Guided Wave ◽  
Early Age ◽  
Monitoring Method ◽  
Sensor Module ◽  
Early Age Concrete ◽  
Plate Type

In this study, a guided wave based nondestructive curing strength monitoring method is proposed to monitor the curing strength of the early-age concrete. This approach used the embedded steel plate-type PZT sensor module which was fabricated by bonding the two pieces of piezoelectric sensor to a steel plate. The steel plate provided the constant path for guided wave propagation and it protected the piezoelectric sensors from impacts and environmental variations. To measure the guided wave signals from the early-age concrete, fabricated sensor modules were landfilled at the same time with concrete placement.While the concrete was curing, guided wave signals were measured by pitch-catch method continuously at regular intervals. Wavelet transform process was performed to improve the quality of the signal by removing the signal’s noise of undesired frequencies. The TOF (Time of flight) of guidedwave was extract from de-noised signal using peak tracing algorithm to calculate the velocity of wave. The calculated wave velocity hysteresis according to the curing time was traced to analysis the pattern of variations of wave velocity. Finally, specific equations to estimate the strength of the concrete were derived using regression analysis based on the wave velocity and compressive strength from destructive compressive strength test.

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