scholarly journals Research on Device Used to Measure Distance and Position for Two Pipelines on the Seafloor

2020 ◽  
Author(s):  
Zhuo Wang ◽  
Qiao-chu Wang ◽  
Tao Wang ◽  
Bo Zhang
Keyword(s):  
Magnetic Coupling ◽  
Rotating Shaft ◽  
Measuring Device ◽  
Measuring Accuracy ◽  
Design Requirements ◽  
Dynamic Seal

In order to solve the problem of measuring the distance and position between the flanges of two pipelines on the seabed, a measuring device for pulling rope in seawater was designed. Aiming at the sealing problem of the key equipment that is the rotating shaft of the rope winch, this paper used the principle of the magnetic coupling to transfer the driving moment, and adopted the method of converting the dynamic seal into the static seal structure to realize the reliable sealing of the motor. Through the experiment of measuring two pipelines with underwater rope pulling device, it was verified that the measuring accuracy of the device meets the design requirements, and the feasibility of the application of magnetic coupling technology in winch is also verified.

scholarly journals Design of a Measuring Device and Winch Structure for Detecting the Distance and Direction of Two Seabed Pipelines

2020 ◽  
Vol 8 (2) ◽  
pp. 130
Author(s):  
Zhuo Wang ◽  
Di Lan ◽  
Tao Wang ◽  
Bo Zhang
Keyword(s):  
Magnetic Coupling ◽  
Rotating Shaft ◽  
Measuring Device ◽  
Measuring Accuracy ◽  
Coupling Principle ◽  
Design Requirements ◽  
Dynamic Seal

To measure the distance and direction between the flanges of two seabed pipelines, a measuring device for pulling a rope in seawater was designed. Addressing the sealing problem of the key equipment the rotating shaft of the rope winch, we used the magnetic coupling principle to transfer the driving moment, and converted the dynamic seal into a static seal structure to reliably seal the motor. Through an experiment measuring two pipelines with the underwater rope pulling device, we verified that the measuring accuracy of the device meets the design requirements, and confirmed the feasibility of applying magnetic coupling technology in winches.

scholarly journals On-machine Measurement and Uncertainty Analysis for Semicircular Narrow Neck Thickness based on Ultra-precision Machine Tool

2021 ◽  
Author(s):  
Xin Jin ◽  
Ruilin Gao ◽  
Chaojiang Li ◽  
Zhong peng Zheng ◽  
zhen Zuo
Keyword(s):  
Measurement Method ◽  
Dimensional Accuracy ◽  
Position Measurement ◽  
Measuring Device ◽  
Flexible Joint ◽  
Accuracy Requirement ◽  
Narrow Neck ◽  
Precision Machine ◽  
Measuring Accuracy ◽  
Ultra Precision

Abstract As flexible joint is a typical low-rigidity micro part, which have four narrow neck structures evenly distributed around its central axis, it is necessary to strictly control the dimensional accuracy of the narrow necks to improve the consistency of stiffness. However, the radius of the arc of the narrow necks is less than 2mm, and the thickness of thinnest part of the necks formed by two adjacent arcs is only tens of microns, which also has sub-micron accuracy requirement. These cross-scale dimensional characteristics and accuracy requirements give rise to extremely difficulty on the measuring process. In this paper, an on-machine measurement method for the semicircular narrow necks was presented and a measuring device was developed based on the comparative principle by making full use of the high linearity characteristic in the small measuring range of the sensor probes. Meanwhile, the on-machine measurement process based on ultra-precision machine tools was also introduced in details. The experiments results show that the uncertainty of the measurement method proposed is less than 0.2µm, and the repeatability is less than 0.1μm, which meet the measuring requirement of flexible joint. Furthermore, the effect of probe position, measurement force, environmental factor and the accuracy of the sensor on total measuring accuracy was analyzed, which could provide further evidences to improve the measuring accuracy. of micro-scale hybrid surface texture.

scholarly journals Identification and analysis of optimal method parameters of the V-block waviness measurements

2016 ◽  
Vol 64 (2) ◽  
pp. 325-332 ◽  
Author(s):  
S. Adamczak ◽  
P. Zmarzły ◽  
K. Stępień
Keyword(s):  
New Method ◽  
Block Method ◽  
Optimal Method ◽  
Measuring Device ◽  
Measuring Accuracy ◽  
University Of Technology ◽  
Cylindrical Parts

Abstract At the Kielce University of Technology, a new method of waviness measurement of cylindrical surfaces has been developed. The article deals with the research conducted to find the optimal V-block method parameters that can be used in a measuring device applied to waviness measurement of cylindrical surfaces. In order to keep high measuring accuracy of V-block method, all detectability coefficients which are function of V-block method parameters should not be negative. For this purpose computations were carried out in order to find such angular parameters that can be easily applied in measuring device and allow for obtaining positive detectability coefficients. Results of the study presented in this paper make it possible to modify the design of the measuring device. According to the authors, it will result in increasing the accuracy of V-block waviness measurement of cylindrical parts.

Low-friction shaft seal composed of bio-inspired materials covering low-speed range under water environment

2017 ◽  
Vol 232 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Takuro Honda ◽  
Keiji Kasamura ◽  
Yuta Nakashima ◽  
Hidehiko Higaki ◽  
Yoshitaka Nakanishi
Keyword(s):  
Water Pressure ◽  
Water Environment ◽  
Tangential Direction ◽  
Fibre Reinforcement ◽  
Rotating Shaft ◽  
Frictional Loss ◽  
Low Speed ◽  
Speed Range ◽  
Dynamic Seal ◽  
Shaft Seals

Shaft seals with a seal lip are used in various applications to separate gases and fluids, but their sealing function and durability are affected by the extent of lubrication at the dynamic seal faces between a rotating shaft and the seal lip. A new sealing system consisting of two hydrated seal rings and non-Newtonian lubricants was designed by a biomimetic approach to minimise frictional loss and provide high waterproof function when separating air and water. This system demonstrates significant superiority in low-speed rotation, conditions under which the lubrication mechanism of an oil seal or mechanical seal does not generally work well. Fibre reinforcement of the seal ring material was performed to prevent the deformation of the soft seal rings because of the frictional force in the tangential direction of the shaft and water pressure. This reinforcement enabled the new sealing system to obtain both high waterproof performance and low frictional characteristics in the speed range of 20–100 r/min.

scholarly journals Dog owner’s accuracy measuring different volumes of dry dog food using three different measuring devices

2019 ◽  
Vol 185 (19) ◽  
pp. 599-599 ◽  
Author(s):  
Jason B Coe ◽  
Alexandra Rankovic ◽  
Tara R Edwards ◽  
Jacqueline M Parr
Keyword(s):  
Measurement Accuracy ◽  
Measuring Device ◽  
Dog Food ◽  
Measuring Devices ◽  
Measuring Accuracy ◽  
Improve Measurement ◽  
Different Types ◽  
Correct Weight ◽  
Dog Owners ◽  
Dry Food

Prior research demonstrates significant inaccuracy when repeatedly measuring the same amount of dry dog food using a dry-food measuring cup, bringing into question the accuracy of measuring devices. This study aimed to determine dog owners’ accuracy when measuring different volumes of dry dog food using different types of measuring devices. One hundred dog owners, randomly assigned one of three measuring devices (a one-cup dry-food measuring cup, a two-cup graduated-liquid measuring cup or a two-cup commercial food scoop), were asked to measure ¼, ½ and 1 cup of dry dog food. Accuracy was assessed with an electronic gram scale by comparing measured volumes with the correct weight in grams. Individual accuracy ranged from −47.83% to 152.17% across devices and volumes. Measuring accuracy was found to be associated with the volume of food measured (p<0.001) and the type of measuring device used (p<0.001). Findings highlight approaches for decreasing excess intake of calories by dogs, including promotion of tactics to improve measurement accuracy (eg, gram scales, volume-calibrated dry-food measuring devices), especially for measuring small volumes.

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

Imaging magnetic microstructure with SEMPA

1993 ◽  
Vol 51 ◽  
pp. 1032-1033
Author(s):  
M. H. Kelley ◽  
J. Unguris ◽  
R. J. Celotta ◽  
D. T. Pierce
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Sandwich Structure ◽  
Magnetic Coupling ◽  
Polarization Analysis ◽  
Secondary Electrons ◽  
Magnetic Microstructure ◽  
Escape Depth ◽  
Scanning Electron

By measuring the spin polarization of secondary electrons generated in a scanning electron microscope, scanning electron microscopy with polarization analysis (SEMPA) can directly image the magnitude and direction of a material’s magnetization. Because the escape depth of the secondaries is only on the order of 1 nm, SEMPA is especially well-suited for investigating the magnetization of ultra-thin films and surfaces. We have exploited this feature of SEMPA to study the magnetic microstrcture and magnetic coupling in ferromagnetic multilayers where the layers may only be a few atomic layers thick. For example, we have measured the magnetic coupling in Fe/Cr/Fe(100) and Fe/Ag/Fe(100) trilayers and have found that the coupling oscillates between ferromagnetic and antiferromagnetic as a function of the Cr or Ag spacer thickness.The SEMPA apparatus has been described in detail elsewhere. The sample consisted of a magnetic sandwich structure with a wedge-shaped interlayer as shown in Fig. 1.

Collaborative Airport Traffic System (CATS) to Evaluate Design Requirements for an Airport Surface Departure Management System

2011 ◽  
Author(s):  
Alicia B. Fernandes ◽  
Philip J. Smith ◽  
Amy Spencer ◽  
Eric Wiley ◽  
Dustin Johnson
Keyword(s):  
Management System ◽  
Traffic System ◽  
Design Requirements
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