Paper 9: Performance Characteristics of a Five-Cylinder Low-Speed Hydraulic Motor

1965 ◽  
Vol 180 (12) ◽  
pp. 102-109
Author(s):  
R. C. Morrison
Keyword(s):  
Performance Characteristics ◽  
Hydraulic Motor ◽  
Low Speed

The Effect of Inlet Distortion on the Performance Characteristics of a Centrifugal Compressor

1983 ◽  
Vol 105 (2) ◽  
pp. 223-230 ◽  
Author(s):  
I. Ariga ◽  
N. Kasai ◽  
S. Masuda ◽  
Y. Watanabe ◽  
I. Watanabe
Keyword(s):  
Centrifugal Compressor ◽  
Total Pressure ◽  
Performance Characteristics ◽  
Performance Tests ◽  
Velocity Measurements ◽  
Test Rig ◽  
Low Speed ◽  
Inlet Distortion ◽  
Surge Margin ◽  
The Given

The present paper concerns itself with the effects of total pressure (and thus velocity) distortion on performance characteristics and surge margin of centrifugal compressors. Both radial and circumferential distortions were investigated. The performance tests as well as the velocity measurements within the impeller passages were carried out with a low-speed compressor test rig with the inlet honeycomb as the distortion generators and compared with the case of “no distortion” as a datum. The results indicated that the inlet distortion exerted unfavorable influences on the efficiency and the surge margin of the given compressor, though the influence of the radial distortion was much stronger than that of the circumferential one. Various distortion indices were further examined in order to correlate the performance to the inlet distortion.

Kinematics Analysis of the New Type of Offset Radial Piston Motor

2014 ◽  
Vol 889-890 ◽  
pp. 463-466
Author(s):  
Sheng Mei Luo ◽  
Wei Liu ◽  
Fu Fang Luo ◽  
Wei Wei Yu ◽  
Zhi Hong Ma
Keyword(s):  
Hydraulic System ◽  
Pure Water ◽  
Low Noise ◽  
Hydraulic Motor ◽  
General Motor ◽  
Low Speed ◽  
Structural Principle ◽  
New Type ◽  
Type Motor ◽  
Startup Performance

This paper introduces the structural principle of a new offset radial type motor. Through analyzing the kinematic characteristics of the motor piston theory, the result shows that the motor has characteristics of good startup performance at low speed, good sliding performance with sliding boots, smooth operation, low noise and so on, so the performance is superior to the general motor of low speed and high torque. Besides, comparing with other types of hydraulic motor, its lifetime increases and it is also easier to produce and repair. Moreover, beside the use of common hydraulic system, it can also be used in pure water hydraulic system under certain conditions.

scholarly journals The Effect of Inlet Distortion on the Performance Characteristics of a Centrifugal Compressor

1982 ◽  
Author(s):  
I. Ariga ◽  
N. Kasai ◽  
S. Masuda ◽  
Y. Watanabe ◽  
I. Watanabe
Keyword(s):  
Centrifugal Compressor ◽  
Total Pressure ◽  
Performance Characteristics ◽  
Performance Tests ◽  
Velocity Measurements ◽  
Test Rig ◽  
Low Speed ◽  
Inlet Distortion ◽  
Surge Margin ◽  
The Given

The present paper concerns itself with the effects of total pressure (and thus velocity) distortion on performance characteristics and surge margin of centrifugal compressors. Both radial and circumferential distortions were investigated. The performance tests as well as the velocity measurements within the impeller passages were carried out with a low speed compressor test rig with the inlet honeycomb as the distortion generators and compared with the case of “no distortion” as a datum. The results indicated that the inlet distortion exerted unfavorable influences on the efficiency and the surge margin of the given compressor, though the influence of the radial distortion was much stronger than that of the circumferential one. Various distortion indices were further examined in order to correlate the performance to the inlet distortion.

Theoretical and experimental studies on the steady-state performance of low-speed high-torque hydrostatic drives. Part 1: Modelling

2009 ◽  
Vol 223 (11) ◽  
pp. 2663-2674 ◽  
Author(s):  
S K Mandal ◽  
K Dasgupta ◽  
S Pan ◽  
A Chattopadhyay
Keyword(s):  
Steady State ◽  
Experimental Studies ◽  
Open Circuit ◽  
State Variables ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Compression And Expansion ◽  
Loss Coefficients ◽  
High Torque ◽  
State Models

In this article the steady-state models of an open-circuit and a closed-circuit hydrostatic transmission (HST) drive have been developed to study their performances. A low-speed high-torque multi-stroke cam plate type radial piston motor is considered for both HST drives. Bondgraph simulation technique has been used to model the drives. The multi-bondgraph representation of the HST drives is presented; it takes into account the compression and expansion phases, which occur sequentially in the hydraulic motor. A reduced bondgraph model of the drives has been proposed, where various losses are lumped into suitable resistive elements. The relationships of the loss coefficients with other state variables, obtained from the reduced model, are identified through experimental investigation. The loss coefficients are found to have a non-linear relationship with the load torque and the supply flowrate. Using the characteristics of these loss coefficients, the steady-state performances of the hydrostatic drives are studied in Part 2 of this article (pg. 2675 of this issue).

Aerodynamic and Performance Analysis of Representatives of One Century of Low Speed Aircraft

2014 ◽  
Vol 1016 ◽  
pp. 400-404
Author(s):  
Luciano Magno Fragola Barbosa ◽  
Paulo H. Iscold A. de Oliveira
Keyword(s):  
Performance Analysis ◽  
Comparative Study ◽  
Low Power ◽  
Reference Data ◽  
Performance Characteristics ◽  
Wing Loading ◽  
Low Speed ◽  
Data Basis ◽  
Low Weight ◽  
And Performance

This work presents a comparative study of aerodynamic and performance characteristics of relevant examples of low speed aircraft that have been built and flown between 1890 and 1990. As speed is related to aircraft mass and wing loading and power, the aircraft analyzed present low weight, low wing loading and low power. To generate this study a set of tools have been developed, which are specifically aimed to slow and light aircraft. One additional goal of the study is to obtain a consistent reference data basis - by using the developed tools to analyze existing aircraft - prior to use these tools in new designs with the features of low speed, low wing loading and low power.

scholarly journals Distribution Performance Analysis and Experimental Research on the Port Plate Pairs of Low Speed High Torque Seawater Hydraulic Motor

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Zhiqiang Wang ◽  
Shaofeng Wu ◽  
Dianrong Gao ◽  
Shuncai Wang
Keyword(s):  
Friction And Wear ◽  
Flow Distribution ◽  
Test System ◽  
Inlet Pressure ◽  
Leakage Flow ◽  
Distribution Characteristics ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Rotating Speed ◽  
High Torque

AbstractThe current research of seawater hydraulic motor mainly focused on piston motor and vane motor, but seldom regarded low speed high torque seawater hydraulic motor. Low speed high torque seawater hydraulic motor as a kind of energy conversion device and actuator plays an important role in seawater hydraulic transmission system. However, the physical and chemical properties of seawater, such as low viscosity, high causticity and poor lubrication, result in numerous problems. In this paper, the flow distribution characteristics of port plate pairs for the seawater hydraulic motor are investigated, and the leakage flow and power loss models of port plate pairs are established. Numerical simulations are carried out to examine the effects of water film, inlet pressure and rotating speed on the pressure distribution and leakage flow. And the friction and wear tests of port plate pairs are also carried out. Moreover, the test system of the seawater hydraulic motor is constructed and the performance of prototype with no-load or loading is conducted. The results indicate that the clearance of port plate pairs and inlet pressure have a significant effect on distribution characteristics, but the effect of rotating speed is not very obvious. The experimental results show that the minimum error rate can be maintained within 0.3% by the proposed flow model and the counter materials of 316L against carbon-fiber-reinforced polyetheretherketone (CFRPEEK) are suitable for the port plate pairs of seawater hydraulic motor. Finally, based on the seawater hydraulic experiment platform, the volumetric efficiency of no-load and loading are obtained that the maximum can achieve 94.71% and 90.14%, respectively. This research work may improve the flow distribution performance, lubrication and the friction and wear properties, enhance energy converting efficiency of port plate pair and provide theoretical and technical support for the design of high-performance water hydraulic components.

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