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.

Study on the Global Bifurcation of Quasi-Zero-Stiffness System

2013 ◽  
Vol 397-400 ◽  
pp. 451-456
Author(s):  
Qing Chao Yang ◽  
Li Hua Yang ◽  
Yan Ping Chen ◽  
Hao Kai Lai
Keyword(s):  
Optimization Design ◽  
Global Bifurcation ◽  
Mapping Method ◽  
Exciting Force ◽  
Force Frequency ◽  
Force Amplitude ◽  
System A ◽  
Wide Range ◽  
Chaos Motion ◽  
Dynamics Approximation

According to the characteristics of the quasi zero stiffness (QZS) system, a dynamics approximation model is established. The effect of excitation force amplitude, frequency and stiffness on the dynamic characteristics of the system is studied by continuation algorithm. The global bifurcation diagram with a wide range of parameters is achieved by using Poincaré mapping method. Results show that when the exciting force amplitude increases to a certain extent, the system will come into multi-cycle and chaos motion state. When exciting force frequency is lower, the system dynamic behavior is complicated, which is helpful for the engineering optimization design.

Analysis of Turnover Mechanism of the Aluminum Electrolytic Capacitor Assembling Machine

2013 ◽  
Vol 341-342 ◽  
pp. 438-442
Author(s):  
Zhou Zheng ◽  
Bi Zhong Xia ◽  
Yi Ran Liu ◽  
Zhong Dong Ouyang
Keyword(s):  
Dynamic Analysis ◽  
Optimization Design ◽  
Parametric Modeling ◽  
Resultant Force ◽  
Electrolytic Capacitor ◽  
Aluminum Electrolytic Capacitor ◽  
Mechanism Optimization ◽  
Structure And Motion ◽  
Adams Software ◽  
Motion Characteristics

Turnover mechanism is one of the important parts of the element bar conveying subsystem in the aluminum electrolytic capacitor assembling machine (AECAM). This paper analyzed the structure and motion characteristics of the turnover mechanism, and used the ADAMS software to do its parametric modeling, dynamic analysis and optimization design. Finally the paper concluded that Final result of turnover mechanism optimization was that the maximum of resultant force in the cam rotary center decreased by 49.3%.Application of ADAMS software will provide a new way for design and improvement of the assembling machine in future.

Optimization Design for Luffing Mechanism of Portal Slewing Crane

2014 ◽  
Vol 577 ◽  
pp. 305-309
Author(s):  
Zhong Hua Luo
Keyword(s):  
Mathematical Model ◽  
Cross Section ◽  
Optimization Design ◽  
Maximum Force ◽  
Optimization Result ◽  
Mechanism Optimization ◽  
Cross Section Area ◽  
Section Area ◽  
Minimum Amplitude ◽  
Comprehensive Study

This paper conducts a comprehensive study on the optimization design for luffing mechanism of portal slewing crane. First, displacement formulae are derived of crampon hinge point of the luffing mechanism. Secondly, mathematical model is established for luffing mechanism optimization design of portal slewing crane, according to the mechanism characteristics, and, with an aim of making crampon hinge end point to move horizontally, and of satisfying the value of maximum and minimum amplitude, and of saving material, etc. Finally, program of optimization design is compiled for the luffing mechanism of portal slewing crane. The luffing mechanism of M4022 portal slewing crane is optimized, and the optimization result is satisfactory. This paper makes it possible to obtain not only each rod length and cross-section area, but also obtain the counterbalance weight and the each rod maximum force of the luffing mechanism.

Worm and Worm Wheel Kinematics Simulation of a Rail Transport Based on ADAMS

2014 ◽  
Vol 945-949 ◽  
pp. 818-821
Author(s):  
Zi Yi Tang ◽  
Xue Jun Wang
Keyword(s):  
Angular Acceleration ◽  
Rail Transport ◽  
Element Analysis ◽  
Compact Structure ◽  
Mechanism Optimization ◽  
Kinematics Simulation ◽  
Design Cycle ◽  
Solid Edge ◽  
The Cost

Worm and worm gear is widely used in modern mechanical industry, it has a lot of advantages including large transmission ratio, compact structure, strong bearing capacity, stable transmission and self-locking performance etc. However, the kinematics characteristic is very important for the performance of equipment. So this article to the worm as the research object, which of the lifting mechanism in rail transport. First, making 3D modeling by Solid Edge V20, Then put the 3D model into the ADAMS, and start the kinematics simulation about transmission mechanism. This paper mainly simulates the angular velocity and angular acceleration of worm when its working, then comparing the change law of the motion curves, and analysis of the results. It can shorten design cycle, improve the design accuracy, reduce the cost of product development, and also create the conditions for the follow-up mechanism optimization and finite element analysis.

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.

Laser switch based on electric field modulated PT-symmetric structure

2020 ◽  
Vol 34 (14) ◽  
pp. 2050155
Author(s):  
Qing-Hua Cao ◽  
Yun-Tuan fang
Keyword(s):  
Electric Field ◽  
Optimization Design ◽  
Defect Mode ◽  
Structure Parameters ◽  
One Dimensional ◽  
Symmetric Structure ◽  
Maximum Value ◽  
Large Peak ◽  
Dynamical Control ◽  
Peak Value

In order to achieve a laser output at 1550 nm and a dynamical control, we perform an optimization design for one-dimensional PT-symmetric structure. The optimization is based on the structure parameters and the modulation of the external electric field. The optimization is performed by three steps: to achieve the defect mode, to achieve the amplification of the defect mode and to move the defect mode with a large peak value to the special wavelength 1550 nm. The maximum transmittance can reach 687.4. Through changing the electric field, the transmittance of the structure can be modulated to an arbitrary value from the cut-off state to its maximum value.

Multi-Objective Optimization of Suspension and Seat for Vehicle Ride Dynamics Behavior Using NSGA-II Method

2013 ◽  
Author(s):  
Kang Song ◽  
Xiao-kai Chen ◽  
Yi Lin
Keyword(s):  
Human Body ◽  
Pareto Frontier ◽  
Elastic Model ◽  
Pareto Optimal ◽  
Objective Functions ◽  
Multi Objective Optimization ◽  
Work Space ◽  
Multi Objective ◽  
Biomechanical Models ◽  
Seat Cushion

A seven degree-of-freedoms human body-seat-suspension model was built for multi-objective optimization of vehicle ride dynamics behavior. Biomechanical models of human body and elastic model of seat cushion were integrated with classical 1/4 car model. The root mean square values of head acceleration of human body, together with suspension work space and dynamic tire load, were selected as objective functions of optimization. Non-dimension method was introduced into the formulation of objective functions so that optimization could be independent of different running conditions. Parameter sensitivity analysis was utilized to explore the relation between objective functions and parameters of suspension and seat cushion. Based on the results of analysis, design variables were determined. Non-dominated Sorting Genetic Algorithm - II was used in this multi-objective optimization problem to compute Pareto optimal set and Pareto frontier. Results indicate that Pareto frontier includes two parts. These two parts have the nearly same range of dynamic tire load and share partial range of suspension work space in objective function space. In design variable space, two parts respectively correspond to two different distribution areas of Pareto optimal solution set. So, for the same expected objective, parameters of suspension and seat cushion usually have at least one available combination, which improves the flexibility of optimal design.

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.

scholarly journals Research on the Optimization the Structural Parameters of Mechanical Treadmill

2015 ◽  
Vol 9 (1) ◽  
pp. 938-943
Author(s):  
Linzhen Wu
Keyword(s):  
Angular Velocity ◽  
Optimization Model ◽  
Kinematic Analysis ◽  
Optimization Design ◽  
Structural Parameters ◽  
Angular Displacement ◽  
Angular Acceleration ◽  
Simulation Software ◽  
Mechanical Transmission ◽  
Amplitude Variation

This paper proposed a three-dimensional model of treadmill, structural diagram of mechanical transmission, structural optimization model and kinematic analysis model, deriving the values of connecting rods as 0.425 m, 1.673 m and 0.662 m by solving the optimization model. It further conducts a kinematic analysis on treadmill using this set of parameters and kinematic simulation software “Motion”, providing simulation curves of angular displacement, angular velocity and angular acceleration of the main moving parts such as the connecting rods, pedals and handrail handles. The simulation curves indicate that when the rotation speed of the wheels is 10 r/min, the connecting rods, pedals and handrail handles move smoothly and change almost sinusoidally; the displacement of handles ranges in-700∼200 mm, the speed ranges in-400∼400 mm/s, the acceleration ranges in -400∼500 mm/s2, the angular change of pedals is -5°∼30°, the amplitude variation of angular velocity is <25°/s and the amplitude variation of angular acceleration is <28°/s2. The above mentioned calculated prospects of the treadmill provide some reference for carrying out a quick optimization design of the treadmill.

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