An Analysis of the Steady-State Performance of the Cylindrical-Spherical Floating Ring Bearing

1987 ◽  
Vol 109 (4) ◽  
pp. 704-708 ◽  
Author(s):  
D. M. Clarke ◽  
C. Fall ◽  
G. N. Hayden ◽  
T. S. Wilkinson
Keyword(s):  
Steady State ◽  
Excellent Agreement ◽  
Power Loss ◽  
Theoretical Work ◽  
Steady State Analysis ◽  
Cavitation Inception ◽  
Inner Surface ◽  
Lubricant Films ◽  
Loss Prediction ◽  
Steady State Performance

A steady-state analysis based on the short bearing approximation is presented for the cylindrical-spherical floating ring bearing, where the inner surface of the ring is cylindrical whilst the outer is spherical. Performance characteristics are compared with Li and Rohde’s theoretical work on the conventional cylindrical-cylindrical bearing. Excellent agreement is obtained, especially for (L/D) = 0.5. The present analysis of both the inner and outer lubricant films, the thickness of the latter varying axially, takes account of striated flow downstream of cavitation inception. The importance of this is demonstrated when considering power loss prediction.

Study on Optimization Design for CSR1000 Core

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Lianjie Wang ◽  
Ping Yang ◽  
Di Lu ◽  
Wenbo Zhao
Keyword(s):  
Steady State ◽  
Power Distribution ◽  
Optimization Design ◽  
Code System ◽  
Fuel Cladding ◽  
Steady State Analysis ◽  
Control Capability ◽  
Supercritical Water Cooled Reactor ◽  
Conceptual Core ◽  
Steady State Performance

An optimization design of China supercritical water-cooled reactor (SCWR) with the rated electric power of 1000 MWe (CSR1000) conceptual core is proposed. Steady-state performance of the proposed core is then studied with the SCWR core steady-state analysis code system SNTA. These key parameters such as burnup performance, reactivity control capability, power distribution, maximum fuel cladding temperature, and maximum linear power density are analyzed. The relative coolant flow rate of the second flow path, which is suited with assembly power, is also presented. The study shows that the refueling cycle of CSR1000 core can be extended effectively under the optimization design.

Steady-state analysis of load-balancing algorithms in the sub-Halfin–Whitt regime

2020 ◽  
Vol 57 (2) ◽  
pp. 578-596 ◽  
Author(s):  
Xin Liu ◽  
Lei Ying
Keyword(s):  
Steady State ◽  
Positive Integer ◽  
Load Balancing ◽  
Heavy Traffic ◽  
Sufficient Condition ◽  
Steady State Analysis ◽  
Server Systems ◽  
Join The Shortest Queue ◽  
Shortest Queue ◽  
Steady State Performance

AbstractWe study a class of load-balancing algorithms for many-server systems (N servers). Each server has a buffer of size $b-1$ with $b=O(\sqrt{\log N})$, i.e. a server can have at most one job in service and $b-1$ jobs queued. We focus on the steady-state performance of load-balancing algorithms in the heavy traffic regime such that the load of the system is $\lambda = 1 - \gamma N^{-\alpha}$ for $0<\alpha<0.5$ and $\gamma > 0,$ which we call the sub-Halfin–Whitt regime ($\alpha=0.5$ is the so-called Halfin–Whitt regime). We establish a sufficient condition under which the probability that an incoming job is routed to an idle server is 1 asymptotically (as $N \to \infty$) at steady state. The class of load-balancing algorithms that satisfy the condition includes join-the-shortest-queue, idle-one-first, join-the-idle-queue, and power-of-d-choices with $d\geq \frac{r}{\gamma}N^\alpha\log N$ (r a positive integer). The proof of the main result is based on the framework of Stein’s method. A key contribution is to use a simple generator approximation based on state space collapse.

Externally-Pressurized Gas-Lubricated Floating-Ring Porous Journal Bearings: Part 1: Steady State Analysis

1984 ◽  
Vol 198 (4) ◽  
pp. 213-224 ◽  
Author(s):  
M Malik
Keyword(s):  
Steady State ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Design Parameters ◽  
Fixed Bearing ◽  
Steady State Analysis ◽  
Permeability Parameter ◽  
New Type ◽  
Bearing Design ◽  
Steady State Performance

A new type of gas-lubricated floating-ring journal bearing in which the fixed bearing and the ring are both porous, has been conceived and analysed, theoretically, for the steady state characteristics. Bearing characteristics are presented against two design parameters, namely, clearances ratio and permeability parameter. The comparison of these characteristics with those of externally-pressurized plain porous journal bearings shows that the new bearing represents, with its steady state performance, a distinctly advanced bearing design.

Quasi-steady-state performance of a heat pipe subjected to transient acceleration loadings

10.2514/3.895 ◽  
1997 ◽  
Vol 11 ◽  
pp. 306-309 ◽  
Author(s):  
Edwin H. Olmstead ◽  
Edward S. Taylor ◽  
Meng Wang ◽  
Parviz Moin ◽  
Scott K. Thomas ◽  
...  
Keyword(s):  
Steady State ◽  
Heat Pipe ◽  
Quasi Steady State ◽  
Steady State Performance
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