Thermal Analysis and Optimization Design on Spindle Bearing of GSCK200A CNC Lathe

2011 ◽  
Vol 314-316 ◽  
pp. 1760-1763
Author(s):  
Le Ping Liu ◽  
Guo Hong Deng
Keyword(s):  
High Speed ◽  
Thermal Deformation ◽  
Optimization Design ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Clearance ◽  
Spindle Bearing ◽  
Heat Transfer Theory ◽  
Cnc Lathe ◽  
Three Dimensional Finite Element

Establish the three-dimensional finite element model of GSCK200A type High-speed & high-precision CNC Lathe spindle bearing, based on tribology and heat transfer theory, using ANSYS to analyze the corresponding temperature field and thermal deformation of spindle bearing in steady working state, according to this thermal deformation to obtain decrease volume of radial clearance, and the installation clearance optimization scheme is putted forward.

scholarly journals Finite life fatigue design of spiral springs of dual-mass flywheels: Analytical estimation and experimental results

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401877847 ◽  
Author(s):  
Daniela Maffiodo ◽  
Raffaella Sesana ◽  
Dino Paolucci ◽  
Sabrina Bertaggia
Keyword(s):  
Finite Element ◽  
Optimization Design ◽  
Three Dimensional ◽  
Element Model ◽  
Installation Space ◽  
Maximum Speed ◽  
Estimation Model ◽  
Element Analysis ◽  
Life Estimation ◽  
Three Dimensional Finite Element

A procedure to design the spiral springs finite life for dual-mass flywheels is presented. Due to design constraints, installation space, production processes, stiffness requirement, maximum torque, and maximum speed, these components are dimensioned for finite life. Two- and three-dimensional finite element model static structural analysis was performed to obtain the stress distribution, deformed shape, and to validate optimization design. The fatigue analysis was performed both experimentally and by means of a component life estimation model. An experimental duty cycle was applied. Finite element analysis and experimental analysis agree in pointing out the location and the value of maximum stresses and the shape of deformation. Vehicle tests highlight premature spiral springs’ failures, which do not agree with life estimation. The examination of the fracture showed that fretting and wear, along with fatigue phenomena, are the causes of premature failures. A dedicated component life estimation model is required, taking into account of wear and loading history.

Optimization of the Engine Hood to Reduce the Head Injury during the Vehicle-Human Collision

2012 ◽  
Vol 192 ◽  
pp. 29-36
Author(s):  
Yu Xin Wang ◽  
Qing Chun Wang ◽  
Jian Rong Fu ◽  
Hong Hai Qiao
Keyword(s):  
Finite Element ◽  
Head Injury ◽  
Optimization Design ◽  
Three Dimensional ◽  
Element Model ◽  
Head Model ◽  
Modeling Software ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
The Impact

Effect of hard point of the engine hood on the head injury during the vehicle-human collision was studied to improve the design of engine hood. Firstly, the current common model of the engine hood was established with three-dimensional finite element modeling software, and 20 areas were divided, also a standard head finite element model was imported, secondly, each area of the engine hood was clashed by the standard head model, then the impact on the head injure was analyzed and the hard point of the hood area was achieved, thirdly, the optimization of the inside and outside panel materials and the plate structure were carried out to reduce the head damage. The simulation results show that the engine hood after optimization gave less damage to the head, which means the research carried out here is of a good reference to the engine hood optimization design for human protection

Electromagnetic torque and strength analysis of combination rotor in high speed PMSM

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1019-1027
Author(s):  
Hao Lin ◽  
Haipeng Geng ◽  
Lie Yu ◽  
Hao Li ◽  
Sheng Feng ◽  
...  
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Element Model ◽  
Strength Analysis ◽  
Electromagnetic Torque ◽  
Foil Bearings ◽  
Three Dimensional Finite Element

For a high-speed permanent magnet synchronous motor supported by air foil bearings, analyzing the influence of the electromagnetic torque on the strength of the combination rotor was necessary. In this study, the electromagnetic torque was obtained using the analytical calculation and the finite element simulation. The contact interface stress analytical equation affected by the electromagnetic torque was elaborated. A three-dimensional finite element model simulating the combination rotor was constructed, and the stress calculations were performed. The strength of the combination rotor met the design requirement. It properly reflected the characteristics of the electromechanical analysis in the combination rotor. The operation experiments were realized to verify the electromagnetic performance and the strength of the combination rotor. The simulation and experimental results were significant for the electromechanical design and analysis of the combination rotor.

Mechanics Modeling and Three-Dimensional Finite Element Simulating for High Speed Milling of Titanium Alloy

2010 ◽  
Vol 29-32 ◽  
pp. 360-364
Author(s):  
Yong Yang ◽  
Yu Ling Wang ◽  
Chang He Li
Keyword(s):  
Finite Element ◽  
Titanium Alloy ◽  
Finite Element Model ◽  
High Speed ◽  
Three Dimensional ◽  
Element Model ◽  
Milling Process ◽  
High Speed Milling ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

A three-dimensional finite element model of helix double-edge cutting is developed to study the ending milling process of titanium alloy Ti6Al4V. Several mechanics models of milling process, such as material constitutive model, friction model and heat transfer model, are implemented to improve finite element simulating accuracy. A milling force experiment is carried out, and a good agreement between simulation and experimental value is achieved, which proved that the finite element model presented in this paper is correct. Using this finite element model, chip formation and cutting temperature are simulated and analyzed. This work will be a base for process parameter optimization, tool’s optimization selection and design during high speed milling of difficult-to-cut titanium alloy.

Tilting Pad Journal Bearing Misalignment Effect on Thermally Induced Synchronous Instability (Morton Effect)

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Dongil Shin ◽  
Alan B. Palazzolo
Keyword(s):  
Journal Bearing ◽  
Three Dimensional ◽  
Element Model ◽  
Fluid Film ◽  
Design Parameters ◽  
Radial Clearance ◽  
Thermally Induced ◽  
Morton Effect ◽  
Three Dimensional Finite Element ◽  
Journal Misalignment

Abstract This paper investigates the influence of misaligned journal bearing effects on the thermally induced rotor instability (Morton effect “ME”) problem. The Morton effect is caused by uneven viscous heating of the journal in a fluid film bearing, which causes thermal bending, especially in rotors with an overhung disc or coupling weight. The thermally induced bending in the shaft may cause a vibration instability, which results in an excessive level of synchronous vibration. Previous research focused on parametric studies of the rotor and bearing design parameters, including overhung mass, bearing radial clearance, and lubricant viscosity. The present study investigates the influence of journal misalignment on the Morton effect. A coupled fluid-thermal-structural, three-dimensional finite element model (FEM) is developed to simulate fluid film pressures and temperatures, and shaft temperatures and vibrations. Simulations were conducted with different ratios of journal misalignment, and different pad-pivot types to determine their effect on the phenomenon. The simulation results indicate that the amplitude of the misalignment angle affects the instability speed range (ISR) caused by the Morton effect under certain conditions.

Reliability optimization design of deformation of CNC lathe spindle considering thermal effect

2021 ◽  
pp. 1748006X2199538
Author(s):  
Haiyang Liu ◽  
Yimin Zhang ◽  
Changyou Li ◽  
Jianguo Gu
Keyword(s):  
Thermal Effect ◽  
High Speed ◽  
Thermal Deformation ◽  
Optimization Design ◽  
Operational Reliability ◽  
Numerical Control ◽  
Machining Accuracy ◽  
Deformation Model ◽  
Reliability Model ◽  
Cnc Lathe

Angular contact ball bearings are widely used in the field of rotating machinery due to their obvious advantages such as relatively good positioning accuracy, high speed rotating performance and low cost, which have already become the most important transmission components. The heterogeneous thermal deformation caused by the high speed effect of bearing parts will lead to excessive noise and even gluing, which can further significantly reduce the machining accuracy of machine tool. Therefore, it is vital to improve the deformation resisting capability and operational reliability of the whole system. For this purpose, this paper presents a reliability model for computerized numerical control (CNC) lathe spindle by considering thermal effect. A five-degree-of-freedom quasi-static model considering thermal deformation is firstly proposed to calculate contact load and contact angle. Then the transient thermal network method is used to solve the temperature value of multi-node spindle-bearing system, and the validity of the proposed model is verified by experiments at different speeds. Next the modified first-order and second-moment method (FOSM) is used to calculate the reliability and reliability sensitivity of CNC lathe spindle deformation model considering thermal effect. Finally, the constrained nonlinear optimization method for the reliability model is proposed and applied to CNC lathe spindle. The results show that the reliability of the optimized model is significantly improved and the reliability robustness is enhanced.

Mathematical Development and Modelling of a Counter Balance Compensating Sleeve for the Suppression of Lateral Vibrations in High Speed Flexible Couplings

2013 ◽  
Author(s):  
Antony Kirk ◽  
Grahame Knowles ◽  
Jill Stewart ◽  
Chris Bingham
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Three Dimensional ◽  
Bending Moment ◽  
Element Model ◽  
Practical Applications ◽  
Lateral Vibrations ◽  
Dimensional Finite Element ◽  
Industrial Gas Turbines ◽  
Three Dimensional Finite Element

High speed drive shafts are traditionally balanced using trim balance weights applied to the shaft ends. This paper considers the development and theoretical analysis of a novel and alternative strategy of balancing long flexible coupling shafts, whereby the trim balancing weights are applied by the means of a pair of ‘Balancing Sleeve’ arms that are integrally attached to each end of the coupling shaft. The trim balance weights are intended to apply a corrective centrifugal force to the coupling shaft in order to limit shaft end reaction forces. With increasing speed, the magnitude of the corrective force also increases due to the flexibility of the balance sleeve. This thereby counteracts the increased coupling shaft unbalance resulting from its own flexibility. Additionally, it is also found that the mechanism imparts a corrective bending moment to the coupling shaft ends, which has a tendency to limit deflection. The methodology is modelled as a rotating simply supported shaft with uniform eccentricity and allows application to the problem of drivetrain balancing of sub-15MW industrial gas turbines. Results show that reaction loads can theoretically be reduced from 10,000 N to approximately zero. The bending moment applied to the shaft is also shown to reduce shaft deflection theoretically to zero. In practical applications this will be unrealistic and achievable results show deflection theoretically reduced by half. Analysis of the balance sleeve feasibility is considered through use of a three-dimensional finite element model. Further to this paper, the aim is to develop a full dynamic model of both shaft and counterbalance sleeve, with verification coming from scaled, experimental test facilities.

Research on Thermal Protection Performances of Metallic Honeycomb Panel Subjected to High-Speed Thermal Shock

2014 ◽  
Vol 494-495 ◽  
pp. 519-524 ◽  
Author(s):  
Da Fang Wu ◽  
An Feng Zhou ◽  
Bing Pan ◽  
Yue Wu Wang ◽  
Ying Pu
Keyword(s):  
High Speed ◽  
Thermal Protection ◽  
Three Dimensional ◽  
Element Model ◽  
Numerical Calculations ◽  
Heating Rates ◽  
Transient Heating ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Honeycomb Panel

In this paper, by using a self-developed transient aerodynamic thermal simulation system, the thermal protection performances of metallic honeycomb panel were tested at different transient heating rates, with a maximum instantaneous temperature reaching 950°C. Furthermore, a three-dimensional finite element model was established to determine the thermal protection performances of the metallic honeycomb panel in different simulation environments with high heating rates. The fact that the numerical calculations agreed well with the experimental results is a good foundation for replacing certain expensive thermal experiments with numerical calculations. The results of this research provided important reference values for the design of the thermal protection system comprising metallic honeycomb panel structures.

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.

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