FUZZY CONTROL OF A SERVOPNEUMATIC WEAR SIMULATOR OF ACETABULAR COMPONENTS OF HIP PROSTHESIS - Implementing Nonlinear Controllers for the Angular Movement of Three Coupled Degrees of Freedom

2011 ◽  
Keyword(s):  
Fuzzy Control ◽  
Degrees Of Freedom ◽  
Hip Prosthesis ◽  
Angular Movement ◽  
Nonlinear Controllers ◽  
Wear Simulator ◽  
Acetabular Components

Fuzzy Control of a Pneumatic Muscle Driven Parallel Robot for Ankle Rehabilitation

2009 ◽  
Author(s):  
Prashant K. Jamwal ◽  
Shane Xie ◽  
Jack Farrant
Keyword(s):  
Fuzzy Control ◽  
Degrees Of Freedom ◽  
Fuzzy Controller ◽  
Parallel Robot ◽  
Modeling And Control ◽  
Pneumatic Muscle ◽  
Linear Behavior ◽  
Improved Performance ◽  
Unpredictable Environment ◽  
And Control

A new wearable parallel robot has been designed and constructed for ankle joint rehabilitation treatments. The robot employs four pneumatic muscle actuators (PMA) together with cables to achieve three rotational degrees of freedom (dof) of its end platform. Parallel topology of the robot, unpredictable environment along with the time varying and non-linear behavior of actuators impose modeling and control challenges which are difficult to comprehend. In this paper an optimal fuzzy dynamic model of the pneumatic muscle has been developed to accurately predict the muscle behavior. The model is capable of mapping the complex relationship in length, force and pressure of the PMA with higher accuracy. This model has been further used to develop a fuzzy control scheme for the ankle robot. Experimental results are obtained to study and model the simultaneous actuation of all the actuators. Comparison with the previous dynamic modeling and control schemes demonstrates an improved performance of the proposed fuzzy controller.

scholarly journals Modified cementless total coxofemoral prosthesis: development, implantation and clinical evaluation

2013 ◽  
Vol 65 (6) ◽  
pp. 1660-1672
Author(s):  
S.A. Arias ◽  
J.R.T. Blanco ◽  
J.V. Doretto ◽  
G.L.T. Vieira ◽  
H.P. Oliveira ◽  
...  
Keyword(s):  
Clinical Evaluation ◽  
Biphasic Calcium Phosphate ◽  
Hip Prosthesis ◽  
Control Group ◽  
Biological Fixation ◽  
Hip Prostheses ◽  
Calcium Phosphate Layer ◽  
Femoral Stems ◽  
Acetabular Components ◽  
Novel Design

The aim of this study was to modify canine coxofemoral prostheses and the clinical evaluation of the implantation. Fifteen canine hips and femora of cadavers were used in order to study the surface points of modification in prostheses and develop a perforation guide. Femoral stems and acetabular components were perforated and coated with biphasic calcium phosphate layer. Twelve young adult male mongrel dogs were implanted with coxofemoral prostheses. Six were operated upon and implanted with cemented canine modular hip prostheses, establishing the control group. The remaining six were implanted with a novel design of cementless porous tricalcic phosphate-hydroxyapatite coated hip prostheses. Clinical and orthopedic performance, complications, and thigh muscular hypotrophy were assessed up to the 120th post-operatory day. After 120 days, animals with cementless prostheses had similar clinical and orthopedic performance compared to the cemented group despite the increased pain thigh hypotrophy. Animals that underwent cementless hip prosthesis evidenced more pain, compared to animals with cemented hip prosthesis that required longer recuperation time. No luxations, two fractures and two isquiatic neurapraxies were identified in the course of the study. Using both the cemented and the bioactive coated cementless model were suitable to dogs, showing clinical satisfactory results. Osseointegration and biological fixation were observed in the animals with the modified cementless hip prosthesis.

Acceleration Compensating Fuzzy Control in Magnetic Suspension System

2012 ◽  
Vol 468-471 ◽  
pp. 64-68 ◽  
Author(s):  
He Xiang Liu ◽  
Hai Tao Yu ◽  
Min Qiang Hu ◽  
Lei Huang ◽  
Li Yu
Keyword(s):  
Fuzzy Control ◽  
Dynamic Stability ◽  
Degrees Of Freedom ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Linear Dynamics ◽  
Control Approach ◽  
Multiple Degrees Of Freedom ◽  
Electromagnetic Suspension ◽  
Magnetic Suspension System

In this paper, an acceleration compensating control approach is used for dealing with the non-linear dynamics of a multiple degrees of freedom electromagnetic suspension system. This method not only has simple configuration and is implement easily, but also improves the performance of the dynamic stability and the anti-jamming capability. Simulations on the magnetic suspension demonstrated the efficiency of proposed method.

Factors Affecting the Design of the Head and Neck Segment of a Contemporary Total Hip Prosthesis

1994 ◽  
Vol 4 (3-4) ◽  
pp. 115-126
Author(s):  
B. Zicat ◽  
Y. Kukita ◽  
S. Grandia ◽  
C. Engh
Keyword(s):  
Head And Neck ◽  
Hip Prosthesis ◽  
Contralateral Side ◽  
Neck Length ◽  
Total Hip Prosthesis ◽  
Younger Patients ◽  
Factors Affecting ◽  
Total Hip ◽  
Relationship Analysis ◽  
Acetabular Components

Anthropometric investigation of femoral sizes and femoral pelvic relationships was performed in a group of unilateral total hip arthroplasty patients. Standardized radiographs were used to perform the measurements. The non-operated, contralateral side was used as a standard for endosteal anatomy and the normal femoral pelvic relationship. Analysis of endosteal shape reveals a spectrum ranging from the stovepipe shape of the aged bone that has undergone diaphyseal expansion, to the trumpet shaped proximal femur found in younger patients. There is also a relationship between this shape and the relative varus or valgus position of the head and neck of the femur. Implants can be designed with head and neck geometry corresponding to these relationships. These implants would reconstruct normal anatomy more accurately. Cementless, acetabula placed in a more medial and proximal position should be matched to femoral components with longer neck-length options than cemented acetabular components.

MRF Hydraulic Mount System of Coach and Research of its Fuzzy Control

2013 ◽  
Vol 284-287 ◽  
pp. 2261-2265
Author(s):  
Yang Zhang ◽  
Zhao Bo Chen ◽  
Ying Hou Jiao
Keyword(s):  
Fuzzy Control ◽  
Degrees Of Freedom ◽  
Ride Comfort ◽  
Fuzzy Controller ◽  
Large Degree ◽  
Model Design ◽  
Six Degrees Of Freedom ◽  
Vibration Model ◽  
Isolation Requirements ◽  
Set Up

Current coach mainly use the passive rubber mount system to isolate vibration, it’s hard to meet the engine broadband range isolation requirements. In order to reduce the coach engine vibration’s influence on the ride comfort and operational stability, it’s proposed that a magnetorheological fluid powertrain mount system. Set up the six degrees of freedom dynamic model and 1/4 engine single freedom vibration model. Design a fuzzy controller, which the input is dynamic exciting force and second order main frequency, the output is control current. Simulate the three types systems with the help of software of MATLAB/SIMULINK and Fuzzy control toolbox. The result shows that when fuzzy controller works, adjustable damping effect is obvious, it can attenuate vibration in large degree. The magnetorheological hydraulic mount with the fuzzy control ,compared with rubber mount and traditional hydraulic mount, has better isolation effect. Its damp can be controlled real-time, and it can be effective in isolation within the broadband.

Simulation Study on ESP Fuzzy Control Based on Road Automatic Identification

2014 ◽  
Vol 1044-1045 ◽  
pp. 863-867
Author(s):  
Yan Rong Fu ◽  
Li Xian Ren ◽  
Guo Ye Wang ◽  
Hai Jing Hou
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
Control Strategy ◽  
High Speed ◽  
Degrees Of Freedom ◽  
Integrated Control ◽  
Automatic Identification ◽  
Electronic Stability Program ◽  
Slip Ratio ◽  
Fuzzy Control Strategy

ESP (Electronic Stability Program) is a kind of active safety device which can comprehensively improve the brake, drive and high speed performance of the automobile. Mastering the key technologies of ESP control system plays an important role in improving the performance of ESP. Vehicle dynamic model and engine model with 9 degrees of freedom of one passenger car were established based on vehicle and tire force analysis. The ESP fuzzy control model based on slip ratio control was established. The optimal slip ratio under different pavements was confirmed by using road recognition method. ESP fuzzy control was realized under MATLAB/Simulink environment. And through the split road simulation prove the validity of the road recognition algorithm, and the effectiveness of the fuzzy control strategy. The simulation and the debugging results indicate that the ESP fuzzy control strategy based on road automatic identification works well, and obviously improves automobile stability under critical situations. And all of these make a good foundation for the further research and development for the ESP integrated control system.

On Fuzzy Control of Chaotic Systems

2004 ◽  
Vol 10 (7) ◽  
pp. 979-993 ◽  
Author(s):  
Ahmad M. Harb ◽  
Issam A. Smadi
Keyword(s):  
Mathematical Model ◽  
Fuzzy Logic ◽  
Fuzzy Control ◽  
Power Systems ◽  
Strange Attractor ◽  
Chaotic Systems ◽  
Chaotic Behavior ◽  
Secure Communications ◽  
Nonlinear Controllers ◽  
Linear And Nonlinear

In this paper, we introduce the control of the strange attractor, chaos. Because of the importance of controlling undesirable behavior in systems. researchers are investigating the use of linear and nonlinear controllers, either to remove such oscillations (in power systems) or to match two chaotic systems (in secure communications). The idea of using the fuzzy logic concept for controlling chaotic behavior is presented. There are two good reasons for using fulzy control: first, there is no mathematical model available for the process; secondly. it can satisfy nonlinear control that can be developed empirically. without complicated mathematics. The two systems are well-known models so the first reason is not a big problem. and we can take advantage of the second reason.

Dual mobility canine total hip prosthesis: Implant characteristics and surgical procedure

2012 ◽  
Vol 25 (06) ◽  
pp. 506-510 ◽  
Author(s):  
A. Autefage ◽  
S. Palierne ◽  
T. Dembour ◽  
J.-L. Chancrin ◽  
P. Guillaumot
Keyword(s):  
High Risk ◽  
Acetabular Component ◽  
Hip Replacement ◽  
Surgical Procedure ◽  
Hip Prosthesis ◽  
The Other ◽  
Total Hip Prosthesis ◽  
Dual Mobility ◽  
Prosthetic Head ◽  
Acetabular Components

SummaryProsthetic dislocation is one of the most common complications after canine hip replacement. The use of dual mobility acetabular components has been shown to reduce the rate of dislocation in first intent hip replacement in human patients who are at high risk for dislocation. In such implants, a mobile polyethylene liner articulates on one side with a metallic acetabular component and on the other side with a metallic prosthetic head. A dual mobility cemented acetabular component has been designed for use in dogs, and is available for use in association with a previously designed modular femoral component. This report describes the characteristics and the procedure for implantation of this implant combination.

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