Design of an Electro-Mechanical Device for Knee Loading Applications

2015 ◽  
Author(s):  
Sai Krishna Prabhala ◽  
Sohel Anwar ◽  
Hiroki Yokota ◽  
Stanley Chien
Keyword(s):  
Clinical Trials ◽  
Knee Joint ◽  
Mechanical Loading ◽  
Software Package ◽  
Bone Fractures ◽  
Dynamic Loads ◽  
Linear Motion ◽  
Mechanical Device ◽  
Periodic Force ◽  
Knee Loading

Mechanical loading of the knee is an innovative modality developed for rehabilitation of the knee joint as well as the femur and tibia that are subjected to bone fractures, osteoarthritis and osteoporosis. Loading essentially applies a lateral and periodic force to the knee joint [1]. In this paper, we propose the design of an electro-mechanical device that is capable of applying such dynamic loads. The key variable attributes of this device are the magnitude of the loading force, together with displacement and frequency. A DC motor with a controller actuates the device to produce the necessary force. The loading force is applied to the knee by a set of pads in a restricted linear motion. The operation of the device is approximated using the software package, SimMechanics of MATLAB. The simulations show that the device is capable of producing a suitable loading force with desired frequency. This simulation helps in constructing the device and performing experiments with appropriate frequencies. The device is expected to stimulate the fluids in porous skeletal matrix, resulting in strengthening the knee and bones. It can be employed for clinical trials for necessary evaluations and improvements.

Influence of People Walking on Floor Performance due to Low Level Vibration

2015 ◽  
Vol 802 ◽  
pp. 208-213
Author(s):  
Tuan Norhayati Tuan Chik ◽  
Shurl Yabi ◽  
Mohd Haziman Wan Ibrahim ◽  
Nor Azizi Yusoff ◽  
Taksiah A. Majid ◽  
...  
Keyword(s):  
Software Package ◽  
Laser Doppler Vibrometer ◽  
Vibration Response ◽  
Dynamic Loads ◽  
Mode Shapes ◽  
Low Level ◽  
Vibration Data ◽  
Finite Element Software ◽  
Floor Structure ◽  
Floor Vibrations

Abstract. Vibration in building is one of the important problems which need to consider, especially in designing the floor. Floor vibrations are generally caused by dynamic loads applied particularly by human activity especially walking. Although it is specified as low level amplitude, walking induced vibrations can cause discomfort to human occupants and alarming for a certain items of precision sensitive equipment. This paper investigates the vibration response on floor performance due to one, three and five of people walking. Laser Doppler Vibrometer was used to obtain vibration data when people are walking. Further analysis was carried out by using finite element software package ANSYS to simulate the floor under vibration inputs to obtain natural frequency and mode shapes of the floor structure. The vibration data was then analysed in ModalV analysis to generate the vibration response. Then, the results were checked against the vibration criteria level guideline as a crude tool comparison. As a result, the numbers of people walking were influenced the floor performance, which indicated five peoples walking show the highest response up to ISO level due to vibration compared with one people walking.

Mechanical loading of porcine knee joint cartilage activates the Akt/PKB signaling pathway

2006 ◽  
Vol 39 ◽  
pp. S587
Author(s):  
A. Niehoff ◽  
W. Bloch ◽  
M. Offermann ◽  
A. Schmidt ◽  
J. Dargel ◽  
...  
Keyword(s):  
Knee Joint ◽  
Signaling Pathway ◽  
Mechanical Loading ◽  
Joint Cartilage ◽  
Porcine Knee

The Knee Loading Apparatus: Axial, Anterior, and Compressive Loading With Magnetic Resonance Imaging

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Jessica C. Küpper ◽  
Ion Robu ◽  
Richard Frayne ◽  
Janet L. Ronsky
Keyword(s):  
Magnetic Resonance ◽  
Knee Joint ◽  
Weight Bearing ◽  
Compressive Loading ◽  
Hydraulic Loading ◽  
Additional Information ◽  
Knee Loading ◽  
Loading System ◽  
Main Components

When magnetic resonance (MR) images are collected while applying a load to the knee joint, additional information about the joint response to loading can be acquired such as cartilage deformation, whole joint and ligament stiffness, or physiological estimates of weight-bearing joint positions. To allow load application and controlled lower limb movement in supine MR imaging, the knee loading apparatus (KLA) was designed to apply safe and physiologically relevant controlled loads to the knee joint, position the knee through a range of flexion angles, and operate successfully in a magnetic environment. The KLA is composed of three main components: a remotely operated custom hydraulic loading system, a logic system that interfaces with the user, and modular non ferromagnetic positioning frames. Three positioning frames are presented for application to anterior tibial loading, tibiofemoral compression, and patellofemoral compression at multiple knee flexion angles. This system design makes improvements over current devices. Safe remotely applied loads (hydraulic loading system) can be applied by either subject or tester and in multiple locations simultaneously. Additionally, loads can be altered at any time in a continuous manner without electrical interference. Transportability was improved due to a smaller footprint. The KLA has the flexibility to attach any positioning frame with many possible loading scenarios without changing the loading mechanism or logic systems, and allows force values over time to be output rather than estimated. An evaluation of the load repeatability (within 7% of applied load) and accuracy (0.5–14.9%) demonstrates the feasibility of this design for investigations into in vivo knee joint responses to loading.

Three-Dimensional Knee Joint Kinetics During a Golf Swing

1998 ◽  
Vol 26 (2) ◽  
pp. 285-294 ◽  
Author(s):  
Charles J. Gatt ◽  
Michael J. Pavol ◽  
Richard D. Parker ◽  
Mark D. Grabiner
Keyword(s):  
Knee Joint ◽  
Three Dimensional ◽  
Skill Level ◽  
Golf Swing ◽  
Joint Kinetics ◽  
Peak Loads ◽  
Knee Rehabilitation ◽  
Peak Knee ◽  
Knee Loading ◽  
Joint Loads

This study characterized knee joint kinetics during a golf swing and determined the influence of shoe type and golfer skill on the peak knee joint loads. Thirteen golfers each hit a golf ball using a five iron under two footware conditions: spiked and spikeless golf shoes. Data from a video-based motion capture system and force plates were used to compute the knee joint kinetics. Mean peak forces and moments differed significantly between the lead and trail knees, but these peak loads were not significantly affected by shoe type. Only the lead knee flexion and internal rotation moments were significantly correlated to skill level. The magnitude of some of the peak loads at the knee during the golf swing approached those reached during activities prohibited until late-stage knee rehabilitation. We concluded the following: The type of shoe worn and the skill level of the golfer need not be considered in deciding time to return to golfing; however, the leg that is recovering from surgery or injury should be considered. The most stressful phase of the golf swing, relative to the knee, is the downswing. There is probably no “normal” swing; each golfer seems to possess consistent, characteristic, patterns of knee loading.

scholarly journals Stress and Deformation Analysis of Joint Plate Depending on Truss Joint Design of Carrying Structure

TEM Journal ◽  
2021 ◽  
pp. 892-899
Author(s):  
Elizabeta Hristovska ◽  
Sevde Stavreva
Keyword(s):  
Finite Element Method ◽  
Software Package ◽  
Dynamic Loads ◽  
Local Analysis ◽  
Deformation Analysis ◽  
Load Carrying ◽  
Static And Dynamic Loads ◽  
The Subject ◽  
Stress And Deformation ◽  
Load Conditions

This article presents the stress and deformation shape of joint plate in two commonly used constructive designs of truss joints of a rotating excavator’s load-carrying structure. A local analysis of stresses and deformations of the joint plate have been conducted taking into consideration the most loaded truss joint of the working wheel’s load-carrying structure on specific rotating excavator, having a riveted design, as well as the theoretically determined forces affecting the joining trusses of the truss joint. These activities are performed employing FEM (Finite Element Method) modelling of the truss joint and using a software package for this purpose, in view of defined characteristic static and dynamic loads. Nowadays, the load-carrying structures are more often made by welding, so it is in our interest as it would affect the stress and deformation shape of the subject truss joint in welded design, bearing the same load conditions.

scholarly journals Eigenfrequency spectrum of the reinforced concrete cantilever beam

2019 ◽  
Vol 91 ◽  
pp. 02031
Author(s):  
Pavel Morozovskiy ◽  
Ilya Kulish ◽  
Nikita Kryzhanovskii ◽  
Vladimir Filatov ◽  
Marina Romanovich
Keyword(s):  
Reinforced Concrete ◽  
Cantilever Beam ◽  
Software Package ◽  
Dynamic Loads ◽  
Building Structures ◽  
Eigen Frequencies ◽  
Eigenfrequency Spectrum ◽  
Eigen Frequency

For the calculation of building structures under the influence of external dynamic loads, it is necessary to know the eigen frequencies of the structures themselves in order to prevent such a phenomenon as resonance. Steel has distinctive properties from concrete, so its consideration is necessary to determine the eigen frequency of the whole structure. This article presents the calculation of the cantilever beam analytically and in the software package Abaqus for linear and volumetric problems with the interaction of concrete and reinforcement. Due to the reinforcement, the beam eigen frequencies differ from the eigen frequency of the conventional rigidly fixed rod, as evidenced by the results of the calculation.

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