A Theoretical Study of the Internal Forces in a Hydraulic Vane Pump with Hypertrochoid Curve in the Inner Surface of its Stator

2012 ◽  
Vol 463-464 ◽  
pp. 301-304 ◽  
Author(s):  
M. Ebrahimi ◽  
S.A. Jazayeri
Keyword(s):  
Inertia Force ◽  
Fluid Viscosity ◽  
Vane Pump ◽  
Pump Design ◽  
Inner Surface ◽  
Dynamics And Control ◽  
Internal Forces ◽  
Line Pressure ◽  
And Control ◽  
Selection Of

In the latest our works, Performance of a fixed displacement- hydraulic balance vane pump, theoretically and practically was studied by application of the basic hypertrochoid curve in the inner surface of its stator. Also the effect of the inertia force of the vanes on the performance of the pump with this curve was studied. This study presents a theoretical analysis of the internal pressure distribution in the pump, and of the resulting forces and torques applied to its components. This analysis is essential to the study of the pump dynamics and control, the pump design, and selection of the pump bearings. These forces are shown to be a function of the line pressure, the shaft rotational speed, the fluid bulk modulus, the fluid viscosity, and the design geometry. These forces are composed of two components: a continuous component due to the exposure of chambers to the line port, and an intermittent component due to a hydraulic lock phenomenon.

A Study of the Internal Forces in a Variable-Displacement Vane-Pump—Part I: A Theoretical Analysis

1986 ◽  
Vol 108 (2) ◽  
pp. 227-232 ◽  
Author(s):  
A. M. Karmel
Keyword(s):  
Design Criterion ◽  
Fluid Viscosity ◽  
Hydraulic Systems ◽  
Continuous Component ◽  
Vane Pump ◽  
Pump Design ◽  
Dynamics And Control ◽  
Variable Displacement ◽  
Line Pressure ◽  
Periodic Components

Growing energy costs continue to motivate the use of variable-displacement pumps in hydraulic systems with varying flow requirements. This study presents an analysis of the internal pressure-distribution in variable-displacement vane-pumps, and of the resulting forces and torques applied to their mechanisms and shafts. This analysis is essential to the study of the pump dynamics and control, the pump design, and the selection of the pump bearings. These forces are shown to be a function of the line pressure, the pump eccentricity, the shaft rotational speed, the fluid bulk modulus, the fluid viscosity, and the design geometry. These forces are composed of two periodic components: a continuous component due to the exposure of chambers to the line port, and an intermittent component due to a hydraulic-lock phenomenon. A design criterion is formulated which eliminates magnitude variations in the continuous component of the radial shaft-load.

A Study of the Internal Forces in a Variable-Displacement Vane-Pump—Part II: A Parametric Study

1986 ◽  
Vol 108 (2) ◽  
pp. 233-237 ◽  
Author(s):  
A. M. Karmel
Keyword(s):  
Parametric Study ◽  
Analytical Study ◽  
Design Criterion ◽  
Vane Pump ◽  
Continuous Components ◽  
Variable Capacity ◽  
Variable Displacement Vane Pump ◽  
Variable Displacement ◽  
Internal Forces ◽  
Line Pressure

This is the second part of an analytical study of the internal forces in a variable-displacement vane-pump. It presents a parametric study of the forces and torques applied to the mechanism and the shaft of this pump, as functions of line pressure, the eccentricity, and the design geometry. It is shown that the continuous components of the torque and of the direction of the radial shaft-load vary as a sawtooth wave at twice the vane-frequency while the magnitude of the radial shaft-load varies as a square wave at vane-frequency. The design criterion developed in the first part of this study is used to demonstrate the elimination of the magnitude variations in the radial shaft-load. The intermittent components of the internal forces vary as a pulse train at vane frequency and may produce high-peak pressure pulses which must be closely controlled. The variable-capacity feature of variable-displacement vane-pumps has a significant effect on the torque applied to the mechanism, but only a secondary effect on the overall radial shaft-load.

Editorial Dynamics and Control of Aerospace and Vertical Transportation Systems

2014 ◽  
Vol 706 ◽  
pp. 1-5
Author(s):  
José M. Balthazar ◽  
Paulo Batista Gonçalves ◽  
Stefan Kaczmarczyk ◽  
André Fenili ◽  
Marcos Silveira ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Transportation Systems ◽  
Special Issue ◽  
Science And Engineering ◽  
International Conference ◽  
Dynamics And Control ◽  
Vibration Problems ◽  
And Control ◽  
New Strategies ◽  
Selection Of

This Special Issue presents a selection of papers initially presented at the 11th International Conference on Vibration Problems (ICOVP-2013), held from 9 to 12 September 2013 in Lisbon, Portugal. The main topics of this Special Issue are linear and, mainly, nonlinear dynamics, chaos and control of systems and structures and their applications in different field of science and engineering. According to the goal of the Special Issue, the selected contributions are divided into three major parts: “Vibration Problems in Vertical Transportation Systems”, “Nonlinear Dynamics, Chaos and Control of Elastic Structures” and “New Strategies and Challenges for Aerospace and Ocean Structures Dynamics and Control”.

scholarly journals Analysis of a Unibody Stub Axle-Hub Design for an ATV

2021 ◽  
Author(s):  
Urooj Ahmad ◽  
Subhrat Praharaj
Keyword(s):  
Dynamic Performance ◽  
Material Design ◽  
Vehicle Performance ◽  
Ground Vehicle ◽  
Dynamics And Control ◽  
Suspension Geometry ◽  
The Cost ◽  
And Control ◽  
Control Behaviour ◽  
Selection Of

This paper aims to design and model a unibody hub and stub axle Wheel assembly to withstand rough terrain conditions while adhering to design optimization objectives of weight, costs, and manufacturability. For any ground vehicle, its dynamics and control behaviour are majorly governed by the design of its wheel assembly since it experiences all the major loads an ATV faces. We aimed to design and fabricate a unibody hub and stub axle that is lightweight and more durable in comparison to the present form of design in which the hub and stub axle is manufactured and assembled separately. The advantages of this unibody design are lesser components, easy replacement, and easy manufacturing. This report also considers the simulation of this unibody using FEM through Ansys, considering all the loads acting on the unibody. Also, the cost and strength comparison of different materials is done for the selection of the best material. Design is done in such a way to consider all the parameters such as performance, reliability, manufacturability, serviceability, weight, and cost. The model achieves a significant reduction in unsprung mass, improving the dynamic performance of the ATV, without requiring a change in suspension geometry. We also analyze the improvement in vehicle performance in shifting from the classic independent stub through hub design to this integrated unibody design.

scholarly journals Rendezvous in Cis-Lunar Space near Rectilinear Halo Orbit: Dynamics and Control Issues

Aerospace ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 68
Author(s):  
Giordana Bucchioni ◽  
Mario Innocenti
Keyword(s):  
Body Motion ◽  
Stable And Unstable Manifolds ◽  
Actuator Dynamics ◽  
Guidance And Control ◽  
Dynamics And Control ◽  
Critical Phases ◽  
Three Body ◽  
And Control ◽  
In Cis ◽  
Selection Of

The paper presents the development of a fully-safe, automatic rendezvous strategy between a passive vehicle and an active one orbiting around the Earth–Moon L2 Lagrangian point. This is one of the critical phases of future missions to permanently return to the Moon, which are of interest to the majority of space organizations. The first step in the study is the derivation of a suitable full 6-DOF relative motion model in the Local Vertical Local Horizontal reference frame, most suitable for the design of the guidance. The main dynamic model is approximated using both the elliptic and circular three-body motion, due to the contribution of Earth and Moon gravity. A rather detailed set of sensors and actuator dynamics was also implemented in order to ensure the reliability of the guidance algorithms. The selection of guidance and control is presented, and evaluated using a sample scenario as described by ESA’s HERACLES program. The safety, in particular the passive safety, concept is introduced and different techniques to guarantee it are discussed that exploit the ideas of stable and unstable manifolds to intrinsically guarantee some properties at each hold-point, in which the rendezvous trajectory is divided. Finally, the rendezvous dynamics are validated using available Ephemeris models in order to verify the validity of the results and their limitations for future more detailed design.

The Inertia Force of the Vanes in the Hydraulic Vane Pump with Advanced Hypertrochoid Curve in the Inner Surface of its Stator

2013 ◽  
Vol 325-326 ◽  
pp. 1440-1444 ◽  
Author(s):  
Mojtaba Ebrahimi ◽  
Seyed Ali Jazayeri
Keyword(s):  
Inertial Force ◽  
Inertia Force ◽  
Vane Pump ◽  
Regular Motion ◽  
Sliding Motion ◽  
Radial Movement ◽  
Inner Surface

The possibility of application of the advanced hypertrochoid curve in the inner surface of the stator of fixed displacement hydraulic vane pump, theoretically was studied in the last our work. By considering the properties of this curve, sealing action between pressure and suction sides of the pump can be improved. One of the important characteristics of a new profile must be improving of the inertial reaction of the vanes in each position where these vanes have a radial movement because it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it. Then at this paper, the effect of the inertial force of the vanes on the performance of the pump with this curve will be studied. The regular motion of the vanes on the inner surface of the stator with smooth profile suppresses the lateral reactional force applied to the vanes and results to diminish local wear of the vanes tip and noise.

A Study of the Effect of the Inertia Force of the Vanes on the Performance of the Hydraulic Vane Pump with Hypertrochoid Curve in the Inner Surface of its Stator

2012 ◽  
Vol 463-464 ◽  
pp. 297-300
Author(s):  
M. Ebrahimi ◽  
S.A. Jazayeri
Keyword(s):  
Inertia Force ◽  
Vane Pump ◽  
Sliding Motion ◽  
Radial Movement ◽  
Inner Surface ◽  
Vibration Noise ◽  
Hydraulic Balance ◽  
Vane Tip

Performance of a fixed displacement hydraulic balance vane pump, theoretically and practically was studied by application of the hypertrochoid curve in the inner surface of its stator. In addition to improving a sealing action between pressure and suction sides of the pump, one of the important characteristics of the hypertrochoid profile is improving of the inertial reaction of the vanes in each position where these vanes have a radial movement. Then it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it because of decreasing vane- tip and inner surface of stator wear and decreasing of vibration, noise and high stresses.

PROJECT ON ELECTRONIC STEERING SYSYTEM

2018 ◽  
Vol 4 (5) ◽  
pp. 7
Author(s):  
Shivam Dwivedi ◽  
Prof. Vikas Gupta
Keyword(s):  
Steering System ◽  
Essential Elements ◽  
Variable Pressure ◽  
Passenger Cars ◽  
Control Techniques ◽  
Steering Mechanism ◽  
Dynamics And Control ◽  
Active Research ◽  
Electronic Steering ◽  
And Control

As the four-wheel steering (4WS) system has great potentials, many researchers' attention was attracted to this technique and active research was made. As a result, passenger cars equipped with 4WS systems were put on the market a few years ago. This report tries to identify the essential elements of the 4WS technology in terms of vehicle dynamics and control techniques. Based on the findings of this investigation, the report gives a mechanism of electronically controlling the steering system depending on the variable pressure applied on it. This enhances the controlling and smoothens the operation of steering mechanism.

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