Dynamic Calculation of Electric Propulsion Motor Tandem Rotors

2022 ◽  
pp. 3-9
Author(s):  
P.P. Gaydzhurov ◽  
G.K. Ptakh
Keyword(s):  
Software Package ◽  
Electric Propulsion ◽  
Three Dimensional ◽  
Calculated Data ◽  
Element Model ◽  
Operating Conditions ◽  
Dynamic Calculation ◽  
Dimensional Finite Element ◽  
Stationary Action ◽  
Three Dimensional Finite Element

The article presents the results of modeling the dynamic response of the tandem rotors of ice-class vessel electric propulsion motors under extreme operating conditions. The loading of rotors by torques in combination with vibration transmitted through the supports to the electric motors is considered as an external non-stationary action. A method for constructing a three-dimensional finite element model of the structure under study by fragmentary assembly has been developed on the basis of the ANSYS Mechanical software package. A scheme of elastic-compliant 3D-links allowing simulating the reciprocating-rotational vibrations of a tandem of rotors is presented. A test example is used to verify the proposed mechanical-mathematical model of the torsion system. Based on the calculated data, the analysis of the dynamic parameters of the tandem rotors is performed for the most unfavorable operating scenarios.

Force and Moment Characteristics of a Rhombi Tessellated Non-Pneumatic Tire

2016 ◽  
Vol 44 (2) ◽  
pp. 130-148 ◽  
Author(s):  
Anand Suresh Kumar ◽  
Ramarathnam Krishna Kumar
Keyword(s):  
Load Distribution ◽  
Three Dimensional ◽  
Element Model ◽  
Operating Conditions ◽  
Lateral Stiffness ◽  
Contact Pressure Distribution ◽  
Static Behavior ◽  
Pneumatic Tire ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

ABSTRACT There has been a recent spate of activities in the design of non-pneumatic tires (NPTs). The validation of a NPT's design is incomplete unless its performance is compared with an equivalent pneumatic tire. Apart from its static behavior, an evaluation of the tire's performance can be done by observing its force and moment (F&M) characteristics. In the present work, an NPT has been designed with an aperiodic rhombi tessellated spoke acting as the load bearing member, where the “unit cell” design is based on the vertical, circumferential, and lateral stiffness offered by the structure. A three-dimensional finite element model has been used to capture the mechanics of load distribution in the spoke, contact patch, and variation of contact pressure distribution when the tire is subjected to different operating conditions. SIMULIA/Abaqus has been used to conduct static loading, acceleration/braking, and cornering analyses. The F&M characteristics have been extracted from these simulations and compared with those of a 165/70R14 passenger car tire. The variation in the vertical and circumferential stiffness based on the spoke geometry has also been highlighted. The use of conventional pneumatic tire's belts to alter the NPT's lateral stiffness, despite the tire behaving like a “bottom loader,” adds uniqueness to the design. The NPT's capability to match the pneumatic tire's performance and the variability observed in the tire's F&M characteristics reiterate the freedom available in NPT design, thus providing the opportunity to have similar tires with varying performance characteristics.

Residual Shank Torque of Bolted Joints: A Numerical Investigation

2019 ◽  
Author(s):  
Stefano Fini ◽  
Massimiliano De Agostinis ◽  
Dario Croccolo ◽  
Giorgio Olmi ◽  
Luca Paiardini ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Operating Conditions ◽  
Torsional Stiffness ◽  
Present Contribution ◽  
Cylindrical Joint ◽  
Analytical Work ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Thick Joint

Abstract During operation, the overall stress state of a screw is a function of the direct stress generated by the axial preload, and the external loads, plus the shear stress due to the residual shank torque. All in all, the higher the residual torque, the lower the direct stress the screw can withstand prior to yielding. The residual shank torque stems from the tightening torque, part of which flows through the shank and it is, only partially, released after wrench removal, thanks to springback phenomena involving both the screw and the joined elements. This phenomenon has been tackled in a previous experimental and analytical work by the authors, which investigated the effect of the stiffness and frictional parameters of the joint on the amount of residual shank torque. Such research was based on a sleevelike specimen, and, in fact, the results were strictly applicable to the case of slender cylindrical joint. The present contribution aims at assessing the effect of the same parameters on the residual shank torque, namely: the ratio between the torsional stiffness of the screw and of the plates, the friction coefficients (underhead and thread). Nonetheless, thanks to a novel three-dimensional finite element model, the parameters have been varied in a much wider range, in order to analyze all the likely operating conditions. The model is capable of predicting the residual shank torque for both the cases of slender and thick joint (plate-like joint). The model has been developed in the Ansys R17 software, but the methodology can be extended to other codes with minimal changes.

Influence of Elastic Deformations of Turbo-Generator Tilting Pad Bearings on the Static Behavior and on the Dynamic Coefficients in Different Designs

1989 ◽  
Vol 111 (2) ◽  
pp. 364-371 ◽  
Author(s):  
D. Brugier ◽  
M. T. Pascal
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Operating Conditions ◽  
Three Dimensional Model ◽  
Static Loads ◽  
Turbo Generator ◽  
Tilting Pad ◽  
Dimensional Finite Element ◽  
Tilting Pad Bearings ◽  
Three Dimensional Finite Element

The load on the larger tilting pad bearing can be as high as 106 N. With such high static loads, pad and pivot distortions and thermal effects in the lubricant cannot be neglected. This paper analyzes the influence of the deformation of the pads and pivots on the static and dynamic behavior of typical turbo-generator tilting pad bearings used in actual operating conditions. Thermal and pressure distortions are compared. The hydrodynamic pressures and lubricant temperatures are computed with a three-dimensional model. Thermal and elastic pad and pivot distortions are obtained with a three-dimensional finite element model.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

scholarly journals Internal Force on and Deformation of Steel Assembled Supporting Structure of Foundation Pit under Thermal Stress

2021 ◽  
Vol 11 (5) ◽  
pp. 2225
Author(s):  
Fu Wang ◽  
Guijun Shi ◽  
Wenbo Zhai ◽  
Bin Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
High Strength ◽  
Element Model ◽  
Internal Force ◽  
Foundation Pit ◽  
Dimensional Finite Element ◽  
Influence Of Temperature On ◽  
Scale Experiment ◽  
Three Dimensional Finite Element

The steel assembled support structure of a foundation pit can be assembled easily with high strength and recycling value. Steel’s performance is significantly affected by the surrounding temperature due to its temperature sensitivity. Here, a full-scale experiment was conducted to study the influence of temperature on the internal force and deformation of supporting structures, and a three-dimensional finite element model was established for comparative analysis. The test results showed that under the temperature effect, the deformation of the central retaining pile was composed of rigid rotation and flexural deformation, while the adjacent pile of central retaining pile only experienced flexural deformation. The stress on the retaining pile crown changed little, while more stress accumulated at the bottom. Compared with the crown beam and waist beam 2, the stress on waist beam 1 was significantly affected by the temperature and increased by about 0.70 MPa/°C. Meanwhile, the stress of the rigid panel was greatly affected by the temperature, increasing 78% and 82% when the temperature increased by 15 °C on rigid panel 1 and rigid panel 2, respectively. The comparative simulation results indicated that the bending moment and shear strength of pile 1 were markedly affected by the temperature, but pile 2 and pile 3 were basically stable. Lastly, as the temperature varied, waist beam 2 had the largest change in the deflection, followed by waist beam 1; the crown beam experienced the smallest change in the deflection.

Process Modeling in Laser Deposition of Multilayer SS410 Steel

2007 ◽  
Vol 129 (6) ◽  
pp. 1028-1034 ◽  
Author(s):  
Liang Wang ◽  
Sergio Felicelli
Keyword(s):  
Phase Transformation ◽  
Temperature Distribution ◽  
Three Dimensional ◽  
Element Model ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Dimensional Finite Element ◽  
Net Shaping ◽  
Three Dimensional Finite Element ◽  
Continuous Cooling Transformation Diagram

A three-dimensional finite element model was developed to predict the temperature distribution and phase transformation in deposited stainless steel 410 (SS410) during the Laser Engineered Net Shaping (LENS™) rapid fabrication process. The development of the model was carried out using the SYSWELD software package. The model calculates the evolution of temperature in the part during the fabrication of a SS410 plate. The metallurgical transformations are taken into account using the temperature-dependent material properties and the continuous cooling transformation diagram. The ferritic and martensitic transformation as well as austenitization and tempering of martensite are considered. The influence of processing parameters such as laser power and traverse speed on the phase transformation and the consequent hardness are analyzed. The potential presence of porosity due to lack of fusion is also discussed. The results show that the temperature distribution, the microstructure, and hardness in the final part depend significantly on the processing parameters.

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