An Experimental Investigation of Electrorheological Fluid Damper Recoil System Used in Heavy Duty Application

2019 ◽  
Author(s):  
Santosh R. Patil ◽  
S. Krishna ◽  
S. S. Gawade ◽  
R. G. Desavale
Keyword(s):  
Dynamic Performance ◽  
Research Work ◽  
Electrorheological Fluid ◽  
Original Position ◽  
Numerical Studies ◽  
Gun Barrel ◽  
Hilly Region ◽  
Fluid Damper ◽  
Mass Displacement ◽  
Er Damper

Abstract In this paper, a detailed analysis of a recoil system of an artillery gun has been carried out with a view to minimize recoil length by absorbing the thrust produced due to firing and bring the gun barrel to its original position for the next round of fire. In many structural and defense applications, minimization of recoil length is one of the major concerns. A lot of research work has been carried out on the recoil mechanism of an artillery gun to improve its mobility in the hilly region. The effect of recoil mass displacement and high fire rate to improve the overall efficiency of an artillery gun has been studied. In this work, the performance of an artillery gun recoil system is studied by using a damper with electrorheological (ER) fluid. Experimental and numerical studies are carried out to evaluate the performance of the recoil system in terms of recoil length and total recoil time at different elevation angles of firing, ranging from 0 to 80°. It is seen that the use of developed ER damper in the gun recoil system improves its dynamic performance.

Study of corrugated disc rotary damper based on intelligent effect

2012 ◽  
Vol 23 (9) ◽  
pp. 995-1000
Author(s):  
Shumei Chen ◽  
Wei Shi
Keyword(s):  
Electrorheological Fluid ◽  
Total Output ◽  
Comparative Performance ◽  
Numerical Studies ◽  
Output Torque ◽  
Fluid Damper ◽  
Dual Plate ◽  
Fluent Software ◽  
Magnetorheological Suspension ◽  
The Impact

An experimental rotary damper device with a corrugated disc and a plate disc (called corrugated damper) has been examined. The narrow gap between the two discs is filled with an electrorheological fluid (or magnetorheological suspension); therefore, the electrostructural effect has to be taken into consideration. Computational fluid dynamics (FLUENT software) is used to produce comparative performance data between corrugated rotary damper and ordinary dual-plate rotary damper. Theoretical and numerical studies have shown that the total output torque increment for the corrugated disc rotary damper is significantly larger than that of the dual-disc rotary damper when the impact of the electric field strength is ignored. The results help the optimal design of a pre-prototyping structure with an electrorheological (or magnetorheological suspension) fluid damper.

Simulation of Dynamic Properties of ER Damper

2012 ◽  
Vol 215-216 ◽  
pp. 901-906
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Yan Song Zhang ◽  
Yu Dong Zhao ◽  
Song Ji ◽  
...  
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Dynamic Properties ◽  
Electrorheological Fluid ◽  
Drift Frequency ◽  
Fluid Damper ◽  
Er Damper ◽  
Velocity Drift ◽  
The Relationship

By way of Matlab software simulation, the relationship among shear stress and frequency, velocity, displacement and ER properties has been researched, the damper strength -- velocity, damper strength – drift properties of shear electrorheological fluid damper has been given, the law of damper strength with frequency, gap , diameter and electric field strength has been showed that damper strength is increasing with electric field strength, the biggest damper strength is 100kN, the key facters are velocity, drift, frequency, gap and etc.

Study on Vibration Attenuation Performance of a New Structural Electrorheological Fluid Damper

2007 ◽  
Author(s):  
Wangzhong Liu ◽  
Zhaobo Chen ◽  
Mingzhang Li ◽  
Yinghou Jiao
Keyword(s):  
Electrorheological Fluid ◽  
Flow Mode ◽  
Damping Force ◽  
Concentric Cylinders ◽  
Negative Electrodes ◽  
Fluid Damper ◽  
Vibration Attenuation ◽  
Vibration Attenuation Performance ◽  
Er Damper ◽  
Two Degree Of Freedom

A new structural ER (electrorheological) damper based on the characteristic of controllable force of electrorheological fluid (ERF) is proposed. The positive and negative electrodes of the damper consisted of series of concentric cylinders generate great damping forces. The damper works in a state of hybrid of shearing and flow mode. The damping force is generated when electric field is applied. The Bingham model are used to describe the ERF in the post-yielding regime, the theoretical expressions of damping force are developed based on numerical analysis of several ER dampers. A simple two degree of freedom vibration system is taken as an example to evaluate the vibration attenuation performance of the damper. The system is excited by sinusoidal force with certain frequency and the ER damper replaced the conventional damper. The simulation results of the response of displacement as well as acceleration are illustrated to show the effectiveness and feasibility of the damper in vibration control.

Electrorheological fluid damper for seismic protection of structures

1995 ◽  
Author(s):  
Nicos Makris ◽  
Davide Hill ◽  
Scott Burton ◽  
Mabel Jordan
Keyword(s):  
Electrorheological Fluid ◽  
Seismic Protection ◽  
Fluid Damper

scholarly journals A Pricing Strategy of E-Commerce Advertising Cooperation in the Stackelberg Game Model with Different Market Power Structure

Algorithms ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 24 ◽  
Author(s):  
Ling Zhu ◽  
Jie Lin
Keyword(s):  
Market Power ◽  
Stackelberg Game ◽  
Research Work ◽  
Power Structure ◽  
Pricing Strategy ◽  
Total System ◽  
Product Price ◽  
Numerical Studies ◽  
Advertising Effort ◽  
The Cost

A lot of research work has studied the auction mechanism of uncertain advertising cooperation between the e-commerce platform and advertisers, but little has focused on pricing strategy in stable advertising cooperation under a certain market power structure. To fill this gap, this paper makes a study of the deep interest distribution of two parties in such cooperation. We propose a pricing strategy by building two stackelberg master-slave models when the e-commerce platform and the advertiser are respectively the leader in the cooperation. It is analyzed that the optimization solution of the profits of both parties and the total system are affected by some main decision factors including the income commission proportion, the advertising product price and the cost of advertising effort of both parties’ brand in different dominant models. Then, some numerical studies are used to verify the effectiveness of the models. Finally, we draw a conclusion and make some suggestions to the platforms and the advertisers in the e-commerce advertising cooperation.

A Novel Fuzzy Adaptive Speed Estimator for Space Vector Modulated DTFC of AC Drives

2011 ◽  
Vol 403-408 ◽  
pp. 4850-4858
Author(s):  
Jagadish H. Pujar ◽  
S. F. Kodad
Keyword(s):  
Fuzzy Control ◽  
Adaptive Systems ◽  
Dynamic Performance ◽  
Research Work ◽  
Speed Control ◽  
Adaptation Mechanism ◽  
Low Speed ◽  
Ac Drives ◽  
Control Scheme ◽  
Speed Estimator

In this paper a novel sensorless speed control scheme of Induction Motor (IM) by means of Direct Torque Fuzzy Control (DTFC), PI-type fuzzy speed regulator and fuzzy based Model Reference Adaptive Systems (MRAS) speed estimator strategies has been proposed, which seems to be a boom in sensorless speed control schemes of AC drives. Normally, the conventional sensorless speed control performance of IM drive deteriorates at low speed. Hence the attention has been focused to improve the performance of the IM drive at low speed range as well, by implementing fuzzy control strategies. So, this research work describes a novel adaptive fuzzy based speed estimation mechanism which replaces the conventional PI controller used in MRAS adaptation mechanism. The proposed scheme is validated through extensive numerical simulations on MATLAB. The simulated results signify that the proposed control scheme provides satisfactory high dynamic performance and robustness during low speed operations of IM drive compare to conventional sensorless speed estimator of DTFC scheme.

Experimental Investigation on Boring Tool Vibration Control Using MR Fluid Damper

2016 ◽  
Vol 15 (01) ◽  
pp. 13-25 ◽  
Author(s):  
E. Mohan ◽  
U. Natarajan
Keyword(s):  
Vibration Control ◽  
Research Work ◽  
Machining Process ◽  
Work Piece ◽  
Mr Fluid ◽  
Tool Vibration ◽  
Fluid Damper ◽  
Boring Tool ◽  
Mr Fluid Damper

In the manufacturing industry, most of the components are made by machining operations. The performance of the product to a large extent is dependent on the accuracy and consistency of the machining processes. Various parameters are considered to achieve the high quality of the machining. Out of which, vibration is one of the important parameters that will lead poor quality of the product and also reduce the tool life. Vibrations are induced by metal cutting operation during machining. Turning operations and especially boring operations are associated with severe vibration-related problems. Boring operation is often done with a boring bar, which is necessarily long and slender so that it can fit into the multipart work piece geometry. Such tools are lack of dynamic stiffness and stability, this manufacturing operation is repeatedly plagued with self-excited vibrations known as chatter. Magnetorheological (MR) fluid is employed in this research work to control the vibration of a boring tool. The MR fluid damper has received great attention due to its ability to reversibly change from a free flowing, linear, viscous liquid to a semi-solid when exposed to magnetic fields in just a few milliseconds and was also found to be effective in suppressing tool vibration. Vibration control during machining process is an important tactic to suppress the chatter vibration. The aim of this approach is to reduce the relative displacements between the tool and the work piece during the machining process.

scholarly journals Dynamic Performance of Partially Orifice Porous Aerostatic Thrust Bearing

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 989
Author(s):  
Muhammad Punhal Sahto ◽  
Wei Wang ◽  
Ali Nawaz Sanjrani ◽  
Cheng Xu Xu Hao ◽  
Sadiq Ali Shah
Keyword(s):  
Thrust Bearing ◽  
Dynamic Stiffness ◽  
Dynamic Performance ◽  
Research Work ◽  
Analysis Model ◽  
Thrust Bearings ◽  
Damping Characteristics ◽  
Fluent Software ◽  
Perturbation Frequency ◽  
The Impact

The aerostatic thrust bearing’s performance under vibration brings certain changes in stiffness and stability, especially in the range of 100 to 10,000 Hz, and it is accompanied by significant increase in fluctuations due to the changes in frequency, and the size of the gas film damping. In this research work, an analysis is carried out to evaluate the impact of throttling characteristics of small size orifice on stiffness and stability optimization of aerostatic thrust bearings. There are two types of thrust bearing orifices such as: partial porous multiple orifice and porous thrust bearings and their effects on variations in damping and dynamic stiffness are evaluated. A simulation based analysis is carried out with the help of the perturbation analysis model of an aerostatic thrust bearing simulation by using FLUENT software (CFD). Therefore, two models of aerostatic thrust bearings—one with the porous and other with partial porous orifice are developed—are simulated to evaluate the effects of perturbation frequencies on the damping and dynamic stiffness. The results reveal a decrease in the amplitude of dynamics capacity with an increase in its frequency, as well as a decrease in the damping of partial porous aerostatic thrust bearings with an increase in the number of orifices. It also reveals an increase in the radius of an orifice with an increment of damping of bearing at the same perturbation frequency and, with an increase in orifice height, a corresponding decrease in the damping characteristics of bearings and in the dynamic stiffness and coefficient of damping of bearing film in the frequency range less than 100 Hz.

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