scholarly journals Finite Element Investigation of the Effects of the Low-Frequency Vibration Generated by Vehicle Driving on the Human Lumbar Mechanical Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Ruo-xun Fan ◽  
Jie Liu ◽  
Yong-li Li ◽  
Jun Liu ◽  
Jia-zi Gao
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Lumbar Spine ◽  
Nucleus Pulposus ◽  
Vibrational Frequency ◽  
Low Frequency ◽  
Fluid Loss ◽  
Low Frequency Vibration ◽  
Human Lumbar Spine

Long-term exposure to low-frequency vibration generated by vehicle driving impairs human lumbar spine health. However, few studies have investigated how low-frequency vibration affects human lumbar mechanical properties. This study established a poroelastic finite element model of human lumbar spinal segments L2–L3 to perform time-dependent vibrational simulation analysis and investigated the effects of different vibrational frequencies generated by normal vehicle driving on the lumbar mechanical properties in one hour. Analysis results showed that vibrational load caused more injury to lumbar health than static load, and vibration at the resonant frequency generated the most serious injury. The axial effective stress and the radial displacement in the intervertebral disc, as well as the fluid loss in the nucleus pulposus, increased, whereas the pore pressure in the nucleus pulposus decreased with increased vibrational frequency under the same vibrational time, which may aggravate the injury degree of human lumbar spine. Therefore, long-term driving on a well-paved road also induces negative effects on human lumbar spine health. When driving on a nonpaved road or operating engineering machinery under poor navigating condition, the auto seat transmits relatively high vibrational frequency, which is highly detrimental to the lumbar spine health of a driver.

Mechanical Properties of Human Lumbar Spine Motion Segments—Part I: Responses in Flexion, Extension, Lateral Bending, and Torsion

1979 ◽  
Vol 101 (1) ◽  
pp. 46-52 ◽  
Author(s):  
A. B. Schultz ◽  
D. N. Warwick ◽  
M. H. Berkson ◽  
A. L. Nachemson
Keyword(s):  
Mechanical Properties ◽  
Lumbar Spine ◽  
Mechanical Behavior ◽  
Human Cadaver ◽  
Lateral Bending ◽  
Human Lumbar Spine ◽  
Flexion Extension ◽  
Spine Motion ◽  
Pressure Changes ◽  
Posterior Elements

In this first part of a three-part report, the mechanical behavior of 42 fresh human cadaver lumbar motion segments in flexion, extension, lateral bending, and torsion is examined. Motions and intradiskal pressure changes that occurred in response to these loads, with posterior elements both intact and excised, are reported.

A FEM Model Analysis of Human Lumbar Spine With Bi-Level Artificial Disc Replacement

2006 ◽  
Author(s):  
A. Faizan ◽  
A. Kiapour ◽  
V. K. Goel ◽  
A. Ivanov ◽  
A. Biyani ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Bending Moment ◽  
Element Model ◽  
Good Alternative ◽  
Disc Replacement ◽  
Artificial Disc ◽  
Fem Model ◽  
Artificial Disc Replacement ◽  
Human Lumbar Spine

A finite element model of human lumbar spine (L3-S1 segment) was used to analyze biomechanical effects of the bi-level CHARITE artificial disc replacement (2LCHD) at L4-L5 and L5-S1 levels. The mechanical behavior and range of motion in implanted and intact models were compared using the finite element analyses and a hybrid loading protocol. In 2LCHD model the changes at L3-L4 level decreased by 25% also the model showed smooth changes in motion at implanted levels. In flexion there was an increase in facet loads at lower levels of 2LCHD however the bending moment in this model was less than intact model because of hybrid loading; in contrast, the facet loads in implanted model decreased in extension. It was observed that the bi-level disc replacement won’t affect much the kinematics of the spine and can be proposed as a good alternative for treatment in cases that disc degeneration occurs at more than one level of spine.

scholarly journals Dynamic Characteristics of Gear Coupling and Rotor System in Transmission Process Considering Misalignment and Tooth Contact Analysis

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1336
Author(s):  
Wei Fan ◽  
Hong Lu ◽  
Yongquan Zhang ◽  
Xiangang Su
Keyword(s):  
Finite Element ◽  
Dynamic Model ◽  
Calculation Method ◽  
High Speed ◽  
Low Frequency ◽  
Rotor System ◽  
Integral Approach ◽  
Time Frequency ◽  
Low Frequency Vibration ◽  
Mass Eccentricity

The dynamic vibration of the gear coupling-rotor system (GCRS) caused by misalignment is an important factor of low frequency vibration and noise radiation of the naval marine. The axial misalignment of gear coupling is inevitable owing to mass eccentricity, and is unconstrained in axial direction at high-speed operation. Therefore, the dynamic model of GCRS is proposed, considering gear-coupling misalignment and contact force in this paper. The whole motion differential equation of GCRS is established based on the finite element method. Moreover, the numerical calculation method of meshing force, considering the uniform distribution load on contact surface, is presented, and the mathematical predictive time–frequency characteristics are analyzed by the Newmark stepwise integral approach. Finally, a reduced-scale application of the propulsion shaft system is utilized to validate the effectiveness of the proposed dynamic model. For the sensibility to low-frequency vibration, the natural frequencies and vibration modes of GCRS are analyzed through the processing and analysis of acceleration signal. The experimental dynamic response and main components of vibration are respectively consistent with mathematical results, which demonstrate the effectiveness of the proposed dynamic model of GCRS with misalignment. Furthermore, it also shows that the proposed finite element analysis and calculation method are suitable for complex shafting, providing a novel thought for dynamic analysis of the propeller–shaft–hull coupled system of marine.

Biomechanical effects of laminectomies in the human lumbar spine: a finite element study

2021 ◽  
Vol 21 (1) ◽  
pp. 150-159
Author(s):  
Nicholas T. Spina ◽  
Genesis S. Moreno ◽  
Darrel S. Brodke ◽  
Sean M. Finley ◽  
Benjamin J. Ellis
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Study ◽  
Human Lumbar Spine ◽  
Element Study

scholarly journals Effect of degeneration on the six degree of freedom mechanical properties of human lumbar spine segments

2016 ◽  
Vol 34 (8) ◽  
pp. 1399-1409 ◽  
Author(s):  
Dhara B. Amin ◽  
Dana Sommerfeld ◽  
Isaac M. Lawless ◽  
Richard M. Stanley ◽  
Boyin Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lumbar Spine ◽  
Degree Of Freedom ◽  
Human Lumbar Spine ◽  
Six Degree Of Freedom

Geometric and Material Property Study of the Human Lumbar Spine Using the Finite Element Method

1992 ◽  
Vol 5 (4) ◽  
pp. 50-59 ◽  
Author(s):  
W. Suwito ◽  
T. S. Keller ◽  
P. K. Basu ◽  
A. M. Weisberger ◽  
A. M. Strauss ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Lumbar Spine ◽  
Material Property ◽  
The Finite Element Method ◽  
Human Lumbar Spine ◽  
Element Method

Analysis of Vibro-Acoustic Modulations in Nonlinear Acoustics Used for Impact Damage Detection - Numerical and Experimental Study

2013 ◽  
Vol 558 ◽  
pp. 341-348 ◽  
Author(s):  
Łukasz Pieczonka ◽  
Andrzej Klepka ◽  
Wieslaw Jerzy Staszewski ◽  
Tadeusz Uhl ◽  
Francesco Aymerich
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Composite Plate ◽  
Natural Frequencies ◽  
Impact Damage ◽  
Low Frequency ◽  
Fe Modeling ◽  
Low Frequency Vibration ◽  
Frequency Excitation ◽  
Nonlinear Acoustic

The paper investigates experimentally the effect of low-frequency vibration on nonlinear vibro-acoustic wave modulations applied to the detection of Barely Visible Impact Damage (BVID) in a composite plate. Finite Element (FE) modeling was used in a pretest stage to identify different motion scenarios of delaminated surfaces and relate them to natural frequencies of the damaged plate. In particular the opening-closing and frictional sliding actions of the defected interfaces have been considered. Subsequently, the identified frequencies have been used for low frequency excitation in nonlinear acoustic experiments on a composite plate with impact damage.

A finite element model for predicting the biomechanical behaviour of the human lumbar spine

2002 ◽  
Vol 10 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Tobias Pitzen ◽  
Fred Geisler ◽  
Dieter Matthis ◽  
Hans Müller-Storz ◽  
Dragos Barbier ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Finite Element Model ◽  
Element Model ◽  
Human Lumbar Spine

scholarly journals Application of Digital Image Correlation to Measurement of Packaging Material Mechanical Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jian-Wei Zhou ◽  
Dong-Hong Liu ◽  
Lan-Yuan Shao ◽  
Zhen-Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Poisson Ratio ◽  
Low Frequency ◽  
Measurement Range ◽  
Image Correlation ◽  
Packaging Materials ◽  
Entire Area ◽  
Low Frequency Vibration

Among various packaging materials, papers and polymer plastics are the most common due to their light weights, low costs, and other advantages. However, their mechanical properties are difficult to measure precisely because of their softness. To overcome the difficulty, a new measure instrument prototype is proposed based on an optical method known as the digital image correlation (DIC). Experiments are designed to apply the DIC to measure mechanical properties of flexible packaging materials, including the stress-strain relationship, the Poisson ratio, the coefficient of heat expansion, the creep deformation, and the top-pressure deformation of corrugated box. In addition, the low frequency vibration of package is simulated, and the vibration frequencies are measured by DIC. Results obtained in the experiments illustrate the advantages of the DIC over traditional methods: noncontact, no reinforced effect, high precision over entire area, wide measurement range, and good measurement stability.

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