Optimization of Electric Turn-Over Bed Based on Mechanism Linkage

2012 ◽  
Vol 479-481 ◽  
pp. 2311-2315
Author(s):  
Shao Jie Xin ◽  
Huan Huan Zhang
Keyword(s):  
Human Body ◽  
Angular Acceleration ◽  
Virtual Sample ◽  
Adams Software ◽  
Optimizing Design ◽  
Turn Over

Electric turn-over bed is designed for those who have the needs of turning their bodies over in bed. The design is based on mechanism linkage and it comply with human body engineering principles. Virtual sample machine is established in ADAMS software, and we focus on making the minimum of the lifting-tilting angular acceleration of bed board during the turn-over. Based on the results of the experiments, optimizing design of turn-over mechanism is provided, and this design guarantees the best structure and size while the constraints are satisfied.

Research on the Kinematic Characteristics of Digging Tree Mechanism of Tree Transplanter

2014 ◽  
Vol 620 ◽  
pp. 381-387 ◽  
Author(s):  
De Jin Zhao ◽  
Yan Ling Guo ◽  
Wen Long Song
Keyword(s):  
Angular Velocity ◽  
Dynamic Simulation ◽  
Analytical Method ◽  
Angular Acceleration ◽  
Hydraulic Cylinder ◽  
Matlab Software ◽  
Kinematic Characteristics ◽  
Adams Software ◽  
Model File

In order to study the kinematic characteristics of the tree transplanter and the hydraulic cylinder, this paper established the model of the tree transplanter with the Cero2.0 software and analyzed kinematic characteristics of the hydraulic cylinder and the tree spade when the tree spade was driven by the hydraulic cylinder with the analytical method. The dynamic simulation curves of the angular velocity and the angular acceleration of the hydraulic cylinder can be obtained with the Matlab software. Then the appropriate format model file was imported into Adams software, and the angular velocity and the angular acceleration of the hydraulic cylinder were analyzed and simulated in Adams. The obtained curves in Adams software were compared with the curves obtained with the Matlab using the analytical method. The result revealed that the trends of the two ways simulation curves were consistent. The comparison showed the analytical method of kinematic characteristics of the tree transplanter and hydraulic cylinder was correct.

The Mechanism Optimization Design of Multifunctional Mobile Electric Bed-Chair

2012 ◽  
Vol 184-185 ◽  
pp. 201-205
Author(s):  
Shao Jie Xin ◽  
Huan Huan Zhang
Keyword(s):  
Human Body ◽  
Optimization Design ◽  
Angular Acceleration ◽  
Mapping Method ◽  
Work Space ◽  
Mechanism Optimization ◽  
Mobile Bed ◽  
Maximum Value ◽  
Geometric Mapping

Multifunctional mobile bed-chair is designed base on human body engineering principles, it has several functions such as mobility, sitting up, bend knees and sleeping flat. We determine the size of components in both back raising mechanism and bend knees mechanism with geometric mapping method to satisfy the requirements of movement and work space. With the soft of ADAMS to optimize and simulate the motion of the bed-chair, the optimization goal is minimization of maximum value of the angular acceleration of both the back rod in back raising mechanism and leg rod in bend knees mechanism. Finally, we got the satisfied size of mechanisms.

scholarly journals Optimization of Interactive Animation Capture System for Human Upper Limb Movement Based on XSENS Sensor

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Chaochun Che
Keyword(s):  
Upper Limb ◽  
Human Body ◽  
Angular Acceleration ◽  
Limb Movement ◽  
Human Anatomy ◽  
Experimental Simulation ◽  
General Function ◽  
Upper Limbs ◽  
Movement Model ◽  
Interactive Animation

This paper uses the XSENS sensor inertial motion capture device to collect the experimental data of the human body’s typical motion and posture-upper limb movement, based on the angular acceleration kinematics parameters of the human body’s upper limbs and upper limbs. We study the characteristics of human kinematics, statics, and dynamics and construct the upper limb movement model of the human body. Secondly, based on the principle of human anatomy, the human body is divided into 23 segments, with 18 upper limbs and 36 degrees of freedom; some anatomical terms are defined, and a unified coordinate system for the upper limb model of the human body is planned and established. In the process of experimental simulation, on the basis of analyzing and summarizing the laws and characteristics of the upper limb angles of the hip upper limbs, knee upper limbs, and ankle upper limbs during walking, a general function of the upper limb angles of the three upper limbs changing with time during walking was established. On the basis of analyzing 40 sets of upper limb movement data, with the three parameters of height, weight, and upper limb movement cycle as independent variables, the general function coefficient solving equation is given through function fitting. Finally, the production of interactive animation of upper limb movement is taken as an example. Based on the acceleration sensor and three-axis gyroscope, the limbs during the movement of the upper limb motion data are collected, preprocessed, and transmitted, and then, coordinate correction and data filtering are used to output quaternary parameters to give Maya an animated character model. The animation interactive demonstration is carried out in the way of web 3D, and the XSENS sensor is explored in the animation capture.

Trajectory Planning Research of Spherical 2-DOF Parallel Manipulator with Actuation Redundancy

2011 ◽  
Vol 308-310 ◽  
pp. 2068-2073
Author(s):  
Yong Quan Li ◽  
Li Jie Zhang ◽  
Ying Liu
Keyword(s):  
Trajectory Planning ◽  
Parallel Manipulator ◽  
Angular Displacement ◽  
Angular Acceleration ◽  
Optimization Method ◽  
Planning Method ◽  
Actuation Redundancy ◽  
Adams Software ◽  
Torque Curve ◽  
Driving Torque

This paper present formation principle of any spherical trajectory curve, and kinematic track of spherical 2-DOF parallel manipulator with actuation redundancy was planned by trajectory planning method that acceleration is continuous segmental function in Cartesian space, in order to guarantee that angular displacement, angular velocity and angular acceleration curve is smooth and continuous, and forward kinematics was simulated by virtue of ADAMS software. At the same time, based on dynamic analysis, smooth and continuous driving torque curve of three actuated joints were obtained by force optimization method. This kind of trajectory planning method laid the foundation for redundant actuation control of the manipulator.

scholarly journals Multi-objective Optimization Design of a Heavy Duty Folding Mechanism and Self-discharging Equipment Development

2020 ◽  
Author(s):  
Lairong Yin ◽  
Chong-Xiang Li ◽  
Juan Huang ◽  
Bo Wen ◽  
Jin-Hang Wang
Keyword(s):  
Optimization Design ◽  
Technical Problem ◽  
Angular Acceleration ◽  
Multi Objective Optimization ◽  
Practical Application ◽  
Connecting Rod ◽  
Heavy Load ◽  
Multi Objective ◽  
Adams Software ◽  
Equipment Development

Abstract In this paper, we investigated the technical problem of the recovery of overlength and heavy load conveying booms of self-unloading ships. A method of folding the conveying boom with a hydraulic-four-bar mechanism is presented, and by using a mathematical model for the optimization of folding speed stationary with ADAMS software, the optimization data and results were obtained. The multi-objective optimization index is introduced, and the multi-objective optimization problem is discussed. The results of the multi-objective optimization showed that parameters such as angular velocity and the change of angular acceleration of the conveyor boom were optimized. The paper has manufactured the connecting rod mechanism, and developed the self-discharging folding conveyance equipment. Through practical application, we determined that the developed folding conveying equipment had the advantages of smooth movement and high folding efficiency.

scholarly journals DETERMINATION OF A GROUND REACTION FORCE AFFECTING HUMAN BODY DURING JUMP

2016 ◽  
Vol 2 (1) ◽  
pp. 32-35
Author(s):  
Robert Karpiński ◽  
Łukasz Jaworski
Keyword(s):  
Human Body ◽  
Ground Reaction Force ◽  
Reaction Force ◽  
Mass Model ◽  
Adams Software

The article presents a study on calculating the ground reaction force, which affects the human body during landing after the jump. A basic, one mass model of human body and an equation of movement are presented in the paper. The model for the studies was created in Adams software and the study on a change of the ground reaction force was performed by using different values of height and mass.

scholarly journals Controlador robusto para el seguimiento de trayectorias para un exoesqueleto de extremidades inferiores

2019 ◽  
pp. 1-8
Author(s):  
Andrés Blanco-Ortega ◽  
Demetrio Pérez-Vigueras ◽  
Edgar Antúnez-Leyva ◽  
Jorge Colín Ocampo
Keyword(s):  
Cell Death ◽  
Lower Extremity ◽  
Muscle Atrophy ◽  
Human Body ◽  
Degrees Of Freedom ◽  
Severe Damage ◽  
Six Degrees Of Freedom ◽  
Adams Software ◽  
Simulation Results ◽  
The Brain

Currently, robotics has shown that it can increase the efficiency in the specific rehabilitation of some of the limbs of the human body, in this case assisting people who have suffered a stroke, by using devices such as exoskeletons, to provide continuous, smooth and controlled movements. Stroke is the result of a shortage of the brain that leads in just a few minutes to cell death, causing severe damage to the human body, even death of the patient. People who have suffered a stroke have difficulty rising from a chair. An exoskeleton is a mechanical structure designed to be used on the human body as a garment, it serves as a support and is used to assist movements or accentuate strength as a support in a person. Lower extremity exoskeleton can assist patients with hemiplegia to get up or sit on a chair, thus avoiding muscle atrophy and possible spasticity. This paper proposes the use of a robust Generalized Proportional Integral (GPI) controller for trajectory tracking for controlling a six degrees of freedom exoskeleton, to assist patients when getting up and sitting down from a chair. Simulation results obtained with the virtual prototype of the exoskeleton, under the environment of the MSC Adams software in co-simulation with Matlab are presented.

Microstructural comparison of synthetic bioceramics with natural bioceramics

1991 ◽  
Vol 49 ◽  
pp. 38-39
Author(s):  
Shulin Wen ◽  
Jingwei Feng ◽  
A. Krajewski ◽  
A. Ravaglioli
Keyword(s):  
Recent Work ◽  
Human Body ◽  
Human Tissues ◽  
Main Constituent ◽  
Laboratory Furnace ◽  
Chinese Adult ◽  
Human Enamel ◽  
Biological Compatibility ◽  
Synthetic Hydroxyapatite ◽  
Synthetic Work

Hydroxyapatite bioceramics has attracted many material scientists as it is the main constituent of the bone and the teeth in human body. The synthesis of the bioceramics has been performed for years. Nowadays, the synthetic work is not only focused on the hydroapatite but also on the fluorapatite and chlorapatite bioceramics since later materials have also biological compatibility with human tissues; and they may also be very promising for clinic purpose. However, in comparison of the synthetic bioceramics with natural one on microstructure, a great differences were observed according to our previous results. We have investigated these differences further in this work since they are very important to appraise the synthetic bioceramics for their clinic application.The synthetic hydroxyapatite and chlorapatite were prepared according to A. Krajewski and A. Ravaglioli and their recent work. The briquettes from different hydroxyapatite or chlorapatite powders were fired in a laboratory furnace at the temperature of 900-1300°C. The samples of human enamel selected for the comparison with synthetic bioceramics were from Chinese adult teeth.

The photoreceptor cytoskeleton visualized

1992 ◽  
Vol 50 (1) ◽  
pp. 480-481
Author(s):  
Beth Burnside
Keyword(s):  
Outer Segment ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Cell Polarization ◽  
Synaptic Proteins ◽  
Cell Functions ◽  
Vertebrate Photoreceptor ◽  
Numerous Cell ◽  
Turn Over

The vertebrate photoreceptor provides a drammatic example of cell polarization. Specialized to carry out phototransduction at its distal end and to synapse with retinal interneurons at its proximal end, this long slender cell has a uniquely polarized morphology which is reflected in a similarly polarized cytoskeleton. Membranes bearing photopigment are localized in the outer segment, a modified sensory cilium. Sodium pumps which maintain the dark current critical to photosensory transduction are anchored along the inner segment plasma membrane between the outer segment and the nucleus.Proximal to the nucleus is a slender axon terminating in specialized invaginating synapses with other neurons of the retina. Though photoreceptor diameter is only 3-8u, its length from the tip of the outer segment to the synapse may be as great as 200μ. This peculiar linear cell morphology poses special logistical problems and has evoked interesting solutions for numerous cell functions. For example, the outer segment membranes turn over by means of a unique mechanism in which new disks are continuously added at the proximal base of the outer segment, while effete disks are discarded at the tip and phagocytosed by the retinal pigment epithelium. Outer segment proteins are synthesized in the Golgi near the nucleus and must be transported north through the inner segment to their sites of assembly into the outer segment, while synaptic proteins must be transported south through the axon to the synapse.The role of the cytoskeleton in photoreceptor motile processes is being intensely investigated in several laboratories.

Study on erythrocytes by SEM photogrammetry (SEMP) technique

1990 ◽  
Vol 48 (3) ◽  
pp. 724-725
Author(s):  
Tong Wensheng ◽  
Lu Lianhuang ◽  
Zhang Zhijun
Keyword(s):  
Quantitative Analysis ◽  
Cell Membrane ◽  
Clinical Diagnosis ◽  
Human Body ◽  
Blood Cells ◽  
Three Dimensional ◽  
Normal Person ◽  
Blood Disease ◽  
Computation Technique ◽  
Important Basis

This is a combined study of two diffirent branches, photogrammetry and morphology of blood cells. The three dimensional quantitative analysis of erythrocytes using SEMP technique, electron computation technique and photogrammetry theory has made it possible to push the study of mophology of blood cells from LM, TEM, SEM to a higher stage, that of SEM P. A new path has been broken for deeply study of morphology of blood cells.In medical view, the abnormality of the quality and quantity of erythrocytes is one of the important changes of blood disease. It shows the abnormal blood—making function of the human body. Therefore, the study of the change of shape on erythrocytes is the indispensable and important basis of reference in the clinical diagnosis and research of blood disease.The erythrocytes of one normal person, three PNH Patients and one AA patient were used in this experiment. This research determines the following items: Height;Length of two axes (long and short), ratio; Crevice in depth and width of cell membrane; Circumference of erythrocytes; Isoline map of erythrocytes; Section map of erythrocytes.

Sign in / Sign up

Export Citation Format

Share Document