scholarly journals Discussion: “A Performance Prediction Method for Unstalled, Two-Dimensional Diffusers” (Reneau, L. R., and Johnston, J. P., 1967, ASME J. Basic Eng., 89, pp. 643–652)

1967 ◽  
Vol 89 (3) ◽  
pp. 652-654
Author(s):  
G. Sovran ◽  
A. B. Cocanower
Keyword(s):  
Performance Prediction ◽  
Prediction Method ◽  
Two Dimensional ◽  
A Performance

A performance prediction method for solar energy systems

Solar Energy ◽  
1992 ◽  
Vol 48 (3) ◽  
pp. 169-175 ◽  
Author(s):  
H. Suehrcke ◽  
P.G. McCormick
Keyword(s):  
Solar Energy ◽  
Performance Prediction ◽  
Prediction Method ◽  
Energy Systems ◽  
A Performance

Development of a performance prediction method for centrifugal compressor channel diffusers

2002 ◽  
Vol 16 (8) ◽  
pp. 1144-1153
Author(s):  
Jeong-Seek Kang ◽  
Sung-Kook Cho ◽  
Shin-Hyoung Kang
Keyword(s):  
Centrifugal Compressor ◽  
Performance Prediction ◽  
Prediction Method ◽  
A Performance

scholarly journals A Performance Prediction Method for a High-Precision Servo Valve Supported by Digital Twin Assembly-Commissioning

Machines ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 11
Author(s):  
Xuemin Sun ◽  
Shimin Liu ◽  
Jinsong Bao ◽  
Jie Li ◽  
Zengkun Liu
Keyword(s):  
High Precision ◽  
Performance Prediction ◽  
Model Simulation ◽  
Measurement Data ◽  
Prediction Method ◽  
Correction Method ◽  
Small Sample ◽  
Servo Valve ◽  
Digital Twin ◽  
A Performance

The manufacturing of a high-precision servo valve belongs to multi-variety, small-batch, and customized production modes. In the process of assembly and commissioning, various characteristic parameters are critical indicators to measure product performance. To meet the performance requirements of a high-precision servo valve, the traditional method usually relies on the test bench and manual experience for continuous trial and error commissioning, which significantly prolongs the whole assembly-commissioning cycle. Therefore, this paper proposed a performance prediction method for a high-precision servo valve supported by digital twin assembly-commissioning. Firstly, the cloud-edge computing network is deployed in the digital twin assembly-commissioning system to improve the efficiency and flexibility of data processing. Secondly, the method workflow of performance prediction is described. In order to improve the accuracy of measurement data, a data correction method based on model simulation and gross error processing is proposed. Aiming at the problem of high input dimension of the prediction model, a key assembly feature parameters (KAFPs) selection method, based on information entropy (IE), is proposed and given interpretability. Additionally, to avoid the poor prediction accuracy caused by small sample data, a performance prediction method based on TrAdaboost was utilized. Finally, the hysteresis characteristic commissioning of a high-precision servo valve is taken as an example to verify the application. The results indicate that the proposed method would enable accurate performance prediction and fast iteration of commissioning decisions.

Performance of Low-Aspect-Ratio Diffusers With Fully Developed Turbulent Inlet Flows: Part II—Development and Application of a Performance Prediction Method

1973 ◽  
Vol 95 (3) ◽  
pp. 393-400
Author(s):  
O. J. McMillan ◽  
J. P. Johnston
Keyword(s):  
Aspect Ratio ◽  
Performance Prediction ◽  
Analytical Method ◽  
Prediction Method ◽  
Two Dimensional ◽  
Integral Type ◽  
Inlet Flow ◽  
Low Aspect Ratio ◽  
Performance Trends ◽  
Wide Range

An analytical method of the integral type is developed to allow prediction of performance in unstalled, straight, two-dimensional rectangular diffusers of aspect ratio less than approximately 0.5. The inlet flow is fully developed and turbulent. The results predicted by this method compare favorably to the data of Part I and to other relevant cases. The method has been applied to extrapolate performance trends to a relatively wide range of related, but untested, geometries and conditions.

Effects of Wall Shape on Flow Regimes and Performance in Straight, Two-Dimensional Diffusers

1967 ◽  
Vol 89 (1) ◽  
pp. 151-159 ◽  
Author(s):  
J. J. Carlson ◽  
J. P. Johnston ◽  
C. J. Sagi
Keyword(s):  
Flow Regime ◽  
Performance Prediction ◽  
Prediction Method ◽  
Flow Regimes ◽  
Two Dimensional ◽  
Simple Class ◽  
And Performance

Three diffuser sets (N/W1, held constant in each set) were built and tested for performance and flow regime over a range of total area ratios, AR, which yielded unstalled and stalled flows. At each AR and N/W1, a simple class of convex-inward (trumpet-shaped), straight, and convex-outward (bell-shaped) wall shapes were tested. It is concluded that there is little advantage to be gained by contouring the walls of two-dimensional diffusers. A corollary result shows that the performance prediction method of reference [1] gives good results for unstalled diffusers.

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