scholarly journals Design and Parameter Study of a Self-Compensating Hydrostatic Rotary Bearing

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaobo Zuo ◽  
Shengyi Li ◽  
Ziqiang Yin ◽  
Jianmin Wang
Keyword(s):  
Influence Factors ◽  
Resistance Ratio ◽  
Design Parameters ◽  
Parameter Study ◽  
Load Carrying Capacity ◽  
Clearance Ratio ◽  
Load Carrying ◽  
Static Performance ◽  
Initial Clearance ◽  
Flow Conservation

The influence of design parameters on the static performance of a newly designed self-compensating hydrostatic rotary bearing was investigated. The bearing was designed by incorporating the main attributes of angled-surface self-compensating bearing and opposed-pad self-compensating bearing. A governing model based on flow conservation was built to theoretically study the static performance, and the methodology was validated by experiments. It is pointed out that the influence factors on the bearing static performance are the designed resistance ratio of the restricting land to the bearing land, the inner resistance ratio of the land between pockets to that between the pocket and the drain groove, the initial clearance ratio of the restricting gap to the bearing gap, and the semiconical angle. Their effects on the load carrying capacity and stiffness were investigated by simulation. Results show that the optimum designed resistance ratio is 1; the initial clearance ratio should be small, and the inner resistance ratio should be large.

Finite Element Analysis of the Static Performance of a Self-Slot-Compensating Aerostatic Bearing

2011 ◽  
Vol 199-200 ◽  
pp. 749-753
Author(s):  
Xiao Bo Zuo ◽  
Jian Min Wang ◽  
Chao Liang Guan ◽  
Juan Li
Keyword(s):  
Finite Element ◽  
Reynolds Equation ◽  
Geometric Parameters ◽  
Load Carrying Capacity ◽  
The Finite Element Method ◽  
Aerostatic Bearing ◽  
Element Analysis ◽  
Consistent Condition ◽  
Load Carrying ◽  
Static Performance

The static performance of an aerostatic bearing with angled surface self-slot-compensation is analyzed. The consistent condition was applied to unitize the Reynolds equation of different forms and the finite element method (FEM) was used to solve the equation. The load carrying capacity (LCC) and the stiffness of the bearing was obtained and the influence of the geometric parameters was discussed. It is concluded that this self-compensating aerostatic bearing can achieve a good performance; the geometric parameters of the gap are interactive, and should be rationally matched.

Theoretical Analysis of Externally Pressurized Air Journal Bearing

1970 ◽  
Vol 12 (2) ◽  
pp. 123-129 ◽  
Author(s):  
B. C. Majumdar
Keyword(s):  
Experimental Data ◽  
Carrying Capacity ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Design Parameters ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Dimensional Parameters ◽  
Bearing Design

A theoretical investigation is made to predict the performance of an externally pressurized air journal bearing having several pressure sources. The pressure distribution, which leads to the determination of load-carrying capacity and flow requirement, is obtained by solving Reynolds equation numerically. The load and flow, expressed in non-dimensional parameters, are presented for different bearing design parameters (dimensionless). The results predicted by this method are compared with others' experimental data.

Performance of the Casing-Plug Joints of Square Steel Tube Structures

2011 ◽  
Vol 462-463 ◽  
pp. 265-270
Author(s):  
Xiu Gen Jiang ◽  
Ning Xu ◽  
Xu Dong Shi ◽  
Yu Huan Wu ◽  
Xing Hua Chen ◽  
...  
Keyword(s):  
Cross Section ◽  
Carrying Capacity ◽  
Failure Modes ◽  
Influence Factors ◽  
Steel Tube ◽  
Load Carrying Capacity ◽  
Ansys Software ◽  
Tube Cross Section ◽  
Load Carrying ◽  
Square Steel Tube

The performance of the casing-plug joint, including load carrying capacity, stiffness, failure modes, and its influence factors of the casing tubes set inside and outside of the main tubes are analyzed by simulating square steel tube casing-plug joints structures with ANSYS software in this paper. The formulas of the optimum l/L for the joints with the size of the main tube cross-section 200mm× 200mm are given in this paper.

scholarly journals Dynamic Carrying Capacity Analysis of Double-Row Four-Point Contact Ball Slewing Bearing

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Yunfeng Li ◽  
Di Jiang
Keyword(s):  
Dynamic Load ◽  
Carrying Capacity ◽  
Point Contact ◽  
Design Parameters ◽  
Load Carrying Capacity ◽  
Double Row ◽  
Slewing Bearing ◽  
Load Carrying ◽  
Bearing Design ◽  
Capacity Surface

Carrying capacity is the most important performance index for slewing bearings. Maximizing the carrying capacity of slewing bearing is one pursuing goal for the bearing designer; this is usually realized by optimizing the design parameters. A method of analyzing the carrying capacity of double-row four-point contact ball slewing bearing by using dynamic carrying capacity surfaces was proposed in this paper. Based on the dynamic load carrying capacity surface of the slewing bearing, the effect of changes of the bearing design parameters, such as axial clearance, raceway groove radius coefficient, and contact angle, on the dynamic carrying capacity of the slewing bearing was researched; the trend and the degree of the effect of the micro changes of the bearing design parameters on the dynamic load carrying capacity of the bearing were discussed, and the results provide the basis for optimizing the design parameter of this type of slewing bearing.

Theoretical Evaluation of Capacitance, Capacitive Reactance, Resistance and Their Effects on Performance of Hydrodynamic Journal Bearings

1991 ◽  
Vol 113 (4) ◽  
pp. 762-767 ◽  
Author(s):  
H. Prashad
Keyword(s):  
Journal Bearings ◽  
Design Parameters ◽  
Clearance Ratio ◽  
Theoretical Evaluation ◽  
Active Resistance ◽  
Variable Resistor ◽  
Load Carrying ◽  
Capacitive Reactance ◽  
Bearing Design ◽  
Safe Load

A theoretical approach is developed to determine capacitance, capacitive reactance, active resistance, and impedance of hydrodynamic journal bearings under different conditions of operation. It has been established that the bearing capacitance increases with eccentricity and L/D ratios but reduces with increase in clearance ratio. On the contrary, resistance and capacitive reactance of a bearing increase with the clearance ratio but reduce with increase in the eccentricity and L/D ratios. However, the bearing impedance is more affected by the resistance than the capacitive reactance. The bearing behaves like a capacitor till the ratio of capacitive reactance to active resistance is less than unity, and acts like a variable resistor as this ratio exceeds unity. This analysis has a potential to analysis safe load carrying capacity at different speeds of operation by determining the bearing capacitance. Also, this may act as a guide to select the bearing design parameters for safe and reliable operation of a hydrodynamic journal bearing.

scholarly journals Analytical Assessment and Comparison of Wood Strength and Density Effect in the Design of Three Connection Types in Double-Shear

2021 ◽  
Author(s):  
Elza M. M. Fonseca ◽  
Pedro A. S. Leite ◽  
Lino D. S. Silva ◽  
Vânia S. B. Silva ◽  
Hernâni M. Lopes
Keyword(s):  
Tensile Load ◽  
Shear Plane ◽  
Design Parameters ◽  
Load Carrying Capacity ◽  
Lower Strength ◽  
Double Shear ◽  
Load Carrying ◽  
Strength Material ◽  
Analytical Assessment ◽  
Wood Strength

This work presents the results of three connection types in double-shear with dowel fasteners, using the simplified equations from the Eurocode 5. All design parameters were established and compared using three different wood strength and density properties, which constitute the members connections. Eighty-one connections were obtained, allowing to conclude about the number of fasteners needed to the applied tensile load. An increase in the number of dowels was obtained with the increased applied tensile load, lower dowel diameter, lower wood density, and lower strength material in all connection types in the study. The design characteristic load-carrying capacity per shear plane and fastener also decrease with the previously considered parameters.

The Influence Factors Researching of Percentage of Load-Carrying Capacity Shared by Concrete for Large Section Concrete-Filled Rectangular Steel Tube Column

2011 ◽  
Vol 243-249 ◽  
pp. 370-373
Author(s):  
Xue Yi Fu ◽  
Na Xu ◽  
Hong Wei Jiao
Keyword(s):  
Carrying Capacity ◽  
Influence Factors ◽  
Steel Tube ◽  
Impact Factors ◽  
Load Carrying Capacity ◽  
Spring Stiffness ◽  
Large Section ◽  
Load Carrying ◽  
The Impact ◽  
The Relationship

Through the analysis of the transmission mechanism—distribution beam for large section (side length>800mm) concrete-filled rectangular steel tube column by the theory of elastic foundation beam we can obtain, percentage of load-carrying capacity shared by concreteis related with vertical spring stiffness of the steel tube, rotational spring stiffness of the steel tube, the vertical spring stiffness of the core concreteand stiffness of the distribution beam. Through analysis of the relationship among percentage of load-carrying capacity shared by concreteand the impact factors, we can identify the main factors that affect the percentage of load-carrying capacity shared by concrete, to control the design of the distribution beam.

Externally Pressurized Step Journal Bearings

1961 ◽  
Vol 83 (4) ◽  
pp. 595-602 ◽  
Author(s):  
Clarence R. Adams ◽  
Juraj Dworski ◽  
Edward M. Shoemaker
Keyword(s):  
Theoretical Method ◽  
Design Parameters ◽  
Load Carrying Capacity ◽  
Test Procedures ◽  
Paper Test ◽  
Static And Dynamic Stability ◽  
Load Carrying ◽  
Rotating Shafts ◽  
Design Simplicity ◽  
Gas Journal Bearing

An externally pressurized gas journal bearing which achieves its load carrying capability by utilizing flow throttling dams parallel to the direction of rotation is discussed in this paper. Test procedures and equipment used to develop this bearing concept are described. A theoretical method of determining pressure distribution and load carrying capacity for the bearing is presented and correlated with experimental data for non-rotating shafts. Experiments showing the behavior of the bearing under shaft whirl conditions are described and illustrated. Suggested ranges of the design parameters are indicated. The paper also points out advantages accruing from the design simplicity as well as the static and dynamic stability of this bearing concept.

Monolithic Morphing Rib With Selective Stiffness From Embeddable Bi-Stable Elements

2018 ◽  
Author(s):  
D. Matthew Boston ◽  
Andres Arrieta ◽  
Jose Rivas-Padilla
Keyword(s):  
Carrying Capacity ◽  
Design Space ◽  
Element Model ◽  
Parameter Study ◽  
Load Carrying Capacity ◽  
Aerodynamic Loading ◽  
Stable Element ◽  
Aeroelastic Analysis ◽  
Load Carrying ◽  
Stable Elements

A trade-off exists in compliant morphing structures between weight, adaptability, and load-carrying capacity. A truss-like structure utilizing a selectively stiff, bi-stable element is proposed to provide a solution to this problem. The design space of the element is explored in a parameter study using a finite element model. The element is embedded in a rib to correlate its behavior to that of the element in isolation. Finally, an aeroelastic analysis is conducted on the rib to determine the response of the structure to aerodynamic loading.

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