Mechanical modeling of an arc-shaped suction slot for compact spinning and analysis of additional twists

In this study, an arc-shaped suction slot was designed for a pneumatic compact spinning system with a lattice apron. A model was built via mechanical analysis of a fibrous strand in an arc-shaped suction slot to calculate additional twists inserted during condensing. The equations can be solved by using the Runge–Kutta method. The simulation results showed that negative pressure and frictional coefficient of the lattice apron and the fibrous strand have significant effects on additional twists of the strand in an arc-shaped slot. The curvature radius of the arc slot has some influence on the additional twists, while that of the condensing surface has no obvious effect on the additional twists. The radius of the strand may significantly influence the additional twists, but the radius of the strand itself is affected by various other factors. Spinning tests were carried out based on the model design. These results verified the additional twist model of the arc-shaped suction slot.

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Study on the model of semi-open-end twist in compact spinning with lattice apron

Textile Research Journal ◽

10.1177/0040517520942545 ◽

2020 ◽

pp. 004051752094254

Author(s):

Ting Fu ◽

Yuze Zhang ◽

Nicholus Tayari Akankwasa ◽

Nanliang Chen ◽

Huiting Lin

Keyword(s):

Dynamic Model ◽

Experimental Test ◽

Negative Pressure ◽

Flow Simulation ◽

Slot Width ◽

Arc Shape ◽

Simulation Results ◽

Compact Spinning ◽

Suction Slot ◽

Linear Shape

The twist mechanism of the fiber strand in the condensing zone in compact spinning is complex. This paper proposes a dynamic model to evaluate the additional twist of the fiber strands. Based on the flow simulation in the condensing zone, the fiber trajectory in the suction slot was simulated and obtained. Several spinning parameters such as suction slot angle, suction slot width, negative pressure, and shape of suction slot, were varied to show their effects on the additional twist. The simulation results indicated that by increasing the suction slot angle from 5° to 10° the additional twist increased significantly. Higher negative pressure also leads to an increase in the additional twist. The suction slot width has a greater effect on the fiber trajectory than on the additional twist. An arc-shape suction slot increased the additional twist compared with a linear-shape one. An experimental test conducted revealed a precise agreement with the simulation results.

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Mechanical analysis of spherical roller bearings due to surface waviness

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406216683975 ◽

2016 ◽

Vol 232 (4) ◽

pp. 639-656 ◽

Cited By ~ 2

Author(s):

Yu Xing ◽

Hua Xu ◽

Xuejing Liu ◽

Hui Xi ◽

Shibin Wang

Keyword(s):

Contact Angle ◽

Mechanical Analysis ◽

The Self ◽

Hertzian Contact ◽

Radial Clearance ◽

Surface Waviness ◽

Characteristic Frequencies ◽

Roller Bearings ◽

Runge Kutta Method ◽

Proposed Model

This work presents a theoretical model to research the vibration due to surface waviness of spherical roller bearings (SRBs), taking account of the self-aligning feature and the external axial load. The surface waviness is described by cosinoidal functions. The self-aligning features, including the variation law of the self-aligning contact angle and the interaction with the external loads, are introduced into the non-Hertzian contact model. The nonlinear equations are solved by Runge–Kutta method and the proposed model is validated by comparing with the results of the published references. The results show more characteristic frequencies will be excited under the self-aligning operating condition, whereby the improved equations proposed in this paper are recommended to instead of the previous ones to predict characteristic frequencies of the waviness vibration in an SRB. In addition, these characteristic vibrations caused by waviness are obviously influenced by the magnitude and the direction of the self-aligning contact angle. A proper pretightening load should be chosen according to the self-aligning feature or else it will lead to hidden dangers. The radial clearance and the waviness amplitude can both highlight the effect of waviness. And the vibration caused by a larger radial clearance may be fiercer than the vibration due to waviness.

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Mechanical analysis on changing cross-sectional segment of fibre band in condensing zone in compact spinning

Journal of the Textile Institute ◽

10.1080/00405000701876444 ◽

2009 ◽

Vol 100 (5) ◽

pp. 451-456 ◽

Cited By ~ 5

Author(s):

J. Wang ◽

J. P. Yang ◽

H. G. Bu ◽

T. Fu ◽

Q. Xi ◽

...

Keyword(s):

Mechanical Analysis ◽

Cross Sectional ◽

Compact Spinning

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Analysis of the Additional Twists on the Fiber Band in Compact Field of Compact Spinning

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.175-176.380 ◽

2011 ◽

Vol 175-176 ◽

pp. 380-384

Author(s):

Jun Wang ◽

Han Guang Liu ◽

Jian Ping Yang ◽

Guang Wei Chen ◽

Ting Fu

Keyword(s):

Mathematic Model ◽

Factors Affecting ◽

Tilting Angle ◽

Compact Field ◽

Spun Yarn ◽

Compact Spinning ◽

Spinning Speed ◽

Suction Slot

Based on the analysis of the motion of fiber band in compact field, a mathematic model is proposed in this article. The factors affecting the additional twists and final twists of the compact spun yarn, such as diameter of the fiber band in the compact field, tilting angle of suction slot in profile tube and spinning speed, were discussed in detail. The validity of the model was validated by experiments.

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Numerical simulation on the condensing effect of suction slot in compact spinning with lattice apron

Journal of the Textile Institute ◽

10.1080/00405000.2012.660760 ◽

2012 ◽

Vol 103 (10) ◽

pp. 1116-1126 ◽

Cited By ~ 1

Author(s):

Wenliang Xue ◽

Mengyuan Wei ◽

Ni Zhang ◽

Longdi Cheng

Keyword(s):

Numerical Simulation ◽

Compact Spinning ◽

Suction Slot

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Numerical simulation of fiber strands on condensing effect of suction slot in compact spinning with lattice apron

Fibers and Polymers ◽

10.1007/s12221-014-1084-0 ◽

2014 ◽

Vol 15 (5) ◽

pp. 1084-1091 ◽

Cited By ~ 3

Author(s):

Chenchen Han ◽

Mengyuan Wei ◽

Wenliang Xue ◽

Longdi Cheng

Keyword(s):

Numerical Simulation ◽

Compact Spinning ◽

Suction Slot

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An improved 3.5° single-bend positive displacement mud motor and its parameter optimization for deep short-radius open-hole sidetracking

Journal of Petroleum Exploration and Production Technology ◽

10.1007/s13202-021-01245-8 ◽

2021 ◽

Author(s):

Weiguang Sun ◽

Xiaomin Liu ◽

Shibin Li ◽

Bing Guan ◽

Jinsong Bai ◽

...

Keyword(s):

Parameter Optimization ◽

Large Angle ◽

Initial Section ◽

Mechanical Analysis ◽

Curvature Radius ◽

Outer Diameter ◽

Positive Displacement ◽

Open Hole ◽

Weight On Bit ◽

Production Increase

AbstractIn order to improve the sidetracking efficiency for the recovery of old wells in the middle and later stage of oilfield, an improved 3.5° single-bend positive displacement mud motor (PDM) is designed. This novel single-bend PDM first uses the structure of 3.5° large angle PDM + cushion block, which can meet the sidetracking requirements of high build-up rate and short directional section in large curvature short-radius sidetracking wells and can significantly improve the build-up ability. Furthermore, based on the mechanical analysis and finite element numerical simulation, its parameter optimization is carried out. The optimal main parameters are determined as follows: the structural bending angle is 3.5°, the outer diameter is 95 mm, the height of the cushion block is 14 mm, the distance between the cushion block and the bending point is 120 mm, the minimum curvature radius is 35.50 m, and the weight-on-bit (WOB) should be less than 30kN. The initial section build-up rate of directional sidetracking can be increased up to 52.67°/30 m ~ 53.29°/30 m. The research results have been applied in Tahe oilfield. It proves that 3.5° single-bend PDM can sidetrack successfully at one time and increase deviation, and the overall angle change rate of bottom hole can reach 45.00°/30 m, which can meet the requirements of short-radius sidetracking with curvature radius of 40 m. The successful application of open-hole sidetracking technology with 3.5° single-bend PDM is of great significance to the production increase and efficiency improvement of old oilfields.

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Coupled Thermal and Fluid Mechanical Modeling of a High Speed Motor Spindle

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.871.161 ◽

2017 ◽

Vol 871 ◽

pp. 161-168

Author(s):

Lukas Koch ◽

Julian Müller ◽

Gordana Michos ◽

Johannes Paulus ◽

Markus Hubert ◽

...

Keyword(s):

Fluid Dynamics ◽

Finite Element Method ◽

Computational Fluid Dynamics ◽

Finite Element ◽

Comparative Analysis ◽

Simulation Model ◽

High Speed ◽

Simulation Models ◽

Mechanical Analysis ◽

Mechanical Modeling

The objective of this survey is to evolve a better understanding of the complex thermal interactions inside a motor spindle. Therefore, the thermal behavior is investigated based on a simulation model and experiments. In contrast to existing simulation models, which either performed a complex thermal examination or an elaborate flow-mechanical analysis, a thermal (Finite Element Method) and fluid mechanical (Computational Fluid Dynamics) coupled simulation model was developed. Based on a comparative analysis, the usability of the currently available boundary conditions is scrutinized.

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Toughening Modification of Polylactic Acid by Thermoplastic Silicone Polyurethane Elastomer

Polymers ◽

10.3390/polym13121953 ◽

2021 ◽

Vol 13 (12) ◽

pp. 1953

Author(s):

Mingtao Sun ◽

Shuang Huang ◽

Muhuo Yu ◽

Keqing Han

Keyword(s):

Mechanical Properties ◽

Polylactic Acid ◽

Mechanical Analysis ◽

Melt Blending ◽

Pseudoplastic Fluid ◽

Obvious Effect ◽

Elongation At Break ◽

Thermodynamic Compatibility ◽

The Poor ◽

The Impact

The melt blending of polylactic acid (PLA) and thermoplastic silicone polyurethane (TPSiU) elastomer was performed to toughen PLA. The molecular structure, crystallization, thermal properties, compatibility, mechanical properties and rheological properties of the PLA/TPSiU blends of different mass ratios (100/0, 95/5, 90/10, 85/15 and 80/20) were investigated. The results showed that TPSiU was effectively blended into PLA, but no chemical reaction occurred. The addition of TPSiU had no obvious effect on the glass transition temperature and melting temperature of PLA, but slightly reduced the crystallinity of PLA. The morphology and dynamic mechanical analysis results demonstrated the poor thermodynamic compatibility between PLA and TPSiU. Rheological behavior studies showed that PLA/TPSiU melt was typically pseudoplastic fluid. As the content of TPSiU increased, the apparent viscosity of PLA/TPSiU blends showed a trend of rising first and then falling. The addition of TPSiU had a significant effect on the mechanical properties of PLA/TPSiU blends. When the content of TPSiU was 15 wt%, the elongation at break of the PLA/TPSiU blend reached 22.3% (5.0 times that of pure PLA), and the impact strength reached 19.3 kJ/m2 (4.9 times that of pure PLA), suggesting the favorable toughening effect.

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