scholarly journals Method, Design, and Evaluation of an Exoskeleton for Lifting a Load In Situ

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xin Li ◽  
Weihao Li ◽  
Qiang Li
Keyword(s):  
Design Method ◽  
Hydraulic Cylinder ◽  
Lower Limbs ◽  
Force Analysis ◽  
Motion Process ◽  
Research Gap ◽  
Exoskeleton Design ◽  
Specific Scenario ◽  
Active Assistance

Due to the unclear application scenarios and force analysis of exoskeletons, there exists a research gap in exoskeleton design. This paper presents a design method and realization of an exoskeleton for a specific scenario of lifting a load in situ. Firstly, the lifting motion process and its data were collected based on a 3-D motion capture system and dynamometer treadmill system. Then, the variations of the torque and motion of each joint were obtained from the data analysis, based on which an active assistance mode for upper limbs and a passive assistance mode for lower limbs were demonstrated. In this design, the hydraulic cylinder for shoulder assistance, the motor for elbow assistance, and the spring for lower limb assistance were calculated and selected according to the motion and torque of each joint. Finally, subjective and objective methods were used to evaluate the exoskeleton based on the results of five test participants, and the median oxygen consumption of the whole test by lifting a load ten times with the assistance was found to be reduced by 9.45% as compared with that in the absence of the exoskeleton.

Design and Integrated Simulation of the Electro-Hydraulic Servo System Based on AMESim and Matlab

2010 ◽  
Vol 44-47 ◽  
pp. 1355-1359 ◽  
Author(s):  
Xiang Xu ◽  
Zhi Xiong Li ◽  
Hong Ling Qin
Keyword(s):  
Control System ◽  
Design Method ◽  
Design Procedure ◽  
Servo System ◽  
Hydraulic Cylinder ◽  
Fast Response ◽  
Simulation Design ◽  
Integrated Simulation ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

Since electro-hydraulic servo system has fast response and highest control accuracy, it has been widely used in industrial application, including aircraft, mining, manufacturing, and agriculture, etc. With the fast development of computer science, it is feasible and available to evaluate the performance of the designed control system via virtual simulation before the practical usage of the system. In order to optimize the design procedure of the electro-hydraulic proportional controller, the co-simulation design method based on AMESim-Matlab is presented for the electro-hydraulic servo system in this paper. High accuracy of the mathematical model of electro-hydraulic servo system was full-fitted by the use of AMESim, and the advantage of high solving precision for large amount of calculation was full played using Matlab. The PID controller was employed to realize the efficient control of the motion of the hydraulic cylinder. The united simulation technique was adopted to verify the good performance of the designed control system. The simulation results suggest that the proposed method is effective for the design of electro-hydraulic servo systems and thus has application importance.

scholarly journals Development of A Medical Device for Quantitative Physical Therapies

2008 ◽  
Vol 2 (2) ◽  
Author(s):  
Hansong Zeng ◽  
Furqan Haq ◽  
Thomas Best ◽  
Sudha Agarwal ◽  
Tim Butterfield ◽  
...  
Keyword(s):  
Medical Device ◽  
Muscle Blood Flow ◽  
Stress Hormones ◽  
Muscle Tension ◽  
Force Sensor ◽  
Well Being ◽  
Lower Limbs ◽  
Fundamental Study ◽  
Physical Therapies

Physical therapies using mechanical loadings are widely used for improving and recovering the physical activities of human tissues. It is generally accepted that such therapies promote health and well-being by many mechanisms, including fastening muscle blood flow, parasympathetic activity, releasing relaxation hormones and inhibiting muscle tension, neuromuscular excitability and stress hormones. Nonetheless, most of current research in this area is based on statistics and thus qualitative, preventing the in-depth study of the effectiveness of these therapies. It is partially due to the lack of appropriate tools for quantitative loading and in situ tissue evaluation. To address this, we developed a medical device that resembles the mechanical motions and loadings that occur in massage therapies by applying combinations of compressive and shear loadings to the subject tissues. This device consists of a loading wheel, a force sensor, a pneumatic actuator, a control system and a data acquisition system. In this work, mechanical forces were applied to the lower limbs of rabbits with controllable magnitudes, frequencies and durations. The changes of mechanical properties of the subjects, including the compliance and the viscosity, were in situ measured as a function of the loading dose, and correlated to the results from biomolecular assay. This device can quickly identify the optimal sets of loading parameters which lead to high effectiveness, and thus provide guidance to practitioners to design their therapies. It is also expected to shed light on the fundamental study of biomechanical forces in regulation of the physiologic conditions of cells and tissues.

scholarly journals Exploring Deep-Rock Mechanics through Mechanical Analysis of Hard-Rock In Situ Coring System

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jianan Li ◽  
Heping Xie ◽  
Ling Chen ◽  
Cong Li ◽  
Zhiqiang He
Keyword(s):  
Rock Mechanics ◽  
Hard Rock ◽  
Design Method ◽  
Drill Pipe ◽  
In Situ Stress ◽  
Drilling Depth ◽  
Innovative Design ◽  
The Core ◽  
Deep Rock

Exploration of deep-rock mechanics has a significant influence on the techniques of mining and rock mechanics. Rock coring technique is the basic method for all rock mechanics study. With the increase of the drilling depth and increasing strength of the hard rock, how to obtain high-quality rock core through various coring techniques is an eternal work. Here an innovative method is applied to design the new coring system to maximize the efficiency of operation. The stress conditions or parameters of rock core in the coring are analyzed, and the mechanism of the core with in situ stress is shown in this paper. The conflict of the core and coring tool chamber is proposed for the innovative design. The innovative design method is fulfilled by the theory of inventive problem solving (TRIZ). An improved coring system for the full-length core with in situ stress was obtained with the solutions of improved coring mechanism, cutting mechanism, and spiral drill pipe.

The Modified Design on the Cantilever Machine Supporting the Roof Frame Anchor System

2014 ◽  
Vol 1079-1080 ◽  
pp. 401-405
Author(s):  
Yan Biao Li ◽  
Zhi Min Zhao ◽  
Yan Yan Wang ◽  
Jia Xuan Zhang ◽  
Ze Sheng Yang
Keyword(s):  
Three Dimensional ◽  
Hydraulic Cylinder ◽  
Force Analysis ◽  
Anchor System ◽  
Support Level ◽  
Support Device ◽  
Temporary Support ◽  
Long Time ◽  
Previous Design ◽  
Roof Support

Basedon the present situation of the domestic comprehensive tunneling temporary supporting technology, machine support and temporary support device is researched. This paper is on the basis of the previous design simple optimization.The design enhances temporary support level and improves its ability to support for a long time, in some extent, increases the strength of roof support. The optimization is described in detail.By adding a hydraulic cylinder,it can make each lever own supporting ability and ensure support stability. Organizationstructure and three dimensional graphics are drawn in the paper.The force analysis is carried. Finally appropriate position is determined.

Design Method of Long-Short-Pile Composite Foundation Base on Tangent Modulus In Situ Loading Test Curve

2011 ◽  
Vol 243-249 ◽  
pp. 2314-2323 ◽  
Author(s):  
Peng Liu ◽  
Guang Hua Yang ◽  
Yu Cheng Zhang
Keyword(s):  
Design Method ◽  
Composite Foundation ◽  
Tangent Modulus ◽  
Loading Test ◽  
Undisturbed Soil ◽  
Foundation Base ◽  
Modulus Method ◽  
S Curve ◽  
Deformation Compatibility

The settlement of each part of the composite foundation, such as the foundation mat, cushion, soils and pile head, is recognized as equivalent under normal working conditions. On the basis of this, the corresponding load on long-short pile and soils can be derived easily from each individual p-s curve. The p-s curve of the composite foundation can be pictured in terms of the mutual actions of all the components mentioned above. and thus the corresponding settlement with load will be determined. Meanwhile, the p-s curve can be obtained via the undisturbed soil hyperbola tangent modulus method, which not only characters the nonlinear relationship between load and settlement very well, but also shows the deformation compatibility among those components. It is found that designed bearing capacity of soil is much higher than the reality based on usual design norms of composite foundation, while pile load is greater than the designed ones, which can be credited to the deformation compatibility of pile-soil not considered.

Percutaneous Infusion System for in Situ Thrombolysis in the Abdominal Aorta and Iliac Arteries

2002 ◽  
Vol 9 (6) ◽  
pp. 932-935 ◽  
Author(s):  
Roberto Fernandez Viña ◽  
Federico Benetti ◽  
Francisco Vrsalovick ◽  
José Luis Rizzardi ◽  
Danilo Petroni ◽  
...  
Keyword(s):  
Abdominal Aorta ◽  
Severe Pain ◽  
Lower Limbs ◽  
Ultrasound Scanning ◽  
Lower Abdomen ◽  
Site Specific ◽  
Iliac Arteries ◽  
Residual Thrombus ◽  
Infusion System

Purpose: To report successful treatment of an occluded aorta with a new percutaneous infusion system. Case Report: A 57-year-old man was admitted in severe pain with cyanosis and acrocyanotic pigmentation in the lower abdomen and limbs. The patient had symptoms of renal disease and severe oligoanuria. Ultrasound scanning detected no flow in the lower limbs, and angiography identified total thromboembolic occlusion of the aorta immediately below the origin of the renal arteries. A new Trellis percutaneous thrombolytic infusion system was used for controlled site-specific infusion and dispersion of streptokinase into the abdominal aorta and the iliofemoral arteries bilaterally with successful restoration of flow and no complications. Conclusions: The Trellis system is effective for rapid lysis of thrombotic emboli using low doses of lytic agents. The unique design of the Trellis allowed complete aspiration of the residual thrombus, thus avoiding adverse effects.

Design Method of Self-Loading Device of the Side-Crane Used for Container

2012 ◽  
Vol 466-467 ◽  
pp. 951-955
Author(s):  
Jun Qing Zhan ◽  
Xiao Mei Feng ◽  
Li Shun Li ◽  
Xiang De Meng
Keyword(s):  
Mathematical Model ◽  
Structural Design ◽  
Design Method ◽  
The Self ◽  
Design Calculation ◽  
Force Analysis ◽  
Loading Device ◽  
Calculation Results ◽  
The Mathematical Model ◽  
Flat Ground

The self-loading device used for side-crane is put forward. Its structure is presented. Based on the force analysis when the side-crane works at flat ground, the mathematical model is established when the crane working at uneven ground. And the design calculation is performed. The self-loading device’s optimal design is accomplished. Based on the above calculation results, the self-loading prototype is manufactured. And the design method can be adopted to the similar equipment’s structural design.

Exoskeleton Device for Rehabilitation of Stroke Patients Using SEMG during Isometric Contraction

2011 ◽  
Vol 403-408 ◽  
pp. 2033-2038 ◽  
Author(s):  
Neelesh Kumar ◽  
Davinder Pal Singh ◽  
Dinesh Pankaj ◽  
Sanjeev Soni ◽  
Amod Kumar
Keyword(s):  
Rehabilitation Medicine ◽  
Lower Limbs ◽  
Inherent Safety ◽  
Human Beings ◽  
Structural Mechanism ◽  
Actuation System ◽  
Low Weight ◽  
Close Proximity ◽  
Assisting Device ◽  
Exoskeleton Design

Robots are becoming more interactive and assisting to human beings day by day. They are serving humanity in the fields of industry, defense and medicine. Exoskeletons are also devices that reside in category of wearable robotics. An exoskeleton is an external structural mechanism with joints and links corresponding to those of the human body. With applications in rehabilitation medicine and virtual reality simulation, exoskeletons offer benefits for both disabled and healthy populations. Exoskeletons can be used as a capability magnifier or assisting device. This paper presents a proposed design for smart active exoskeleton for lower limbs. This proposed exoskeleton design not only assist a person but also tries to improve its GAIT. The twin wearable legs are powered by Actuators, all controlled by a microprocessor. The simulation results of the control mechanism shows its smart capabilities. In addition, the processor based control produces a more natural muscle like activity and as such can be considered a soft and bio-mimetic actuation system. This capacity to “replicate” the function of natural muscle and inherent safety is extremely important when working in close proximity to humans. The integration of the components sections and testing of the performance will also be considered to show how the structure and actuators can be combined to produce the various systems needed for a highly flexible/low weight clinically viable rehabilitation exoskeleton.

scholarly journals Visualized Spontaneous Molecular Directed Motion in Solid State

2019 ◽  
Author(s):  
Jianxun Liu ◽  
Chang Xing ◽  
Donghui Wei ◽  
Cuiping Yang ◽  
Qiuchen Peng ◽  
...  
Keyword(s):  
Solid State ◽  
Real Time ◽  
Stable State ◽  
Ordered Structure ◽  
Directed Motion ◽  
Kinetic Information ◽  
Motion Process ◽  
Fluorescence Change ◽  
New Perspective

The real-time <a>monitoring of</a> spontaneous molecular directed motion is a highly important but very challenging task. In this work, a rod-like <a>aggregation-induced emission</a> (AIE) molecule of salicylaldehyde 4-butoxyaniline Schiff base (<b>SBA</b>) was deliberately designed and facilely synthesized, which exhibits unique self-recovery property from semi-ordered structure to ordered structure alongwith significant fluorescence change after grinding. The monitoring of the fluorescence change provides rich kinetic information including kinetic order, rate constants, half-life and apparent activation energy of the spontaneous molecular directed motion process. Unlike instrumental analytical methods such as PXRD and AFM, which only give the information of a stable state of samples, the fluorescence method provided a new perspective to real-time visualize spontaneous molecular directed motion <i>in situ</i> in solid state.

scholarly journals Seismic Response of Performance Base Designed Building : A Review

2021 ◽  
Vol 1197 (1) ◽  
pp. 012027
Author(s):  
Sarosh Sheikh ◽  
S S Sanghai ◽  
Abhijeet Nardey
Keyword(s):  
Seismic Design ◽  
Cost Efficiency ◽  
Seismic Behavior ◽  
Design Method ◽  
Property A ◽  
Element Analysis ◽  
Loss Of Life ◽  
Plastic Design ◽  
Research Gap ◽  
Irregular Buildings

Abstract A review on Performance Based Plastic Design method (PBPD) for RCC building has been presented in this paper with detailed manner. The first is the study of Performance Based Plastic Design method relating with IS code method. And then secondly review includes the research gap that is to apply this method on Irregular Buildings and to observe the efficiency of Design and Cost analysis comparing to IS code recommendations. When a Structure is designed by IS Code (IS 456: 2000) recommendations, it satisfies the strength as well as serviceability standards. But when an earthquake hits the structure, it leads to collapse which leads to loss of life as well as property. A Recently developed PBPD method can be a promising & efficient seismic design approach as it counteract total collapse of structure. This method is becoming popular due to its total collapse prevention. The paper addressed the relevant examination of provisions as specified in the appropriate design standard and software-based finite element analysis conducted by various authors, as well as a review of the problem, in order to reach a meaningful conclusion for the study. Also, a suggestion for the scope of future development is to study the Design as well as Cost efficiency of Performance Based Plastic Design of Various Irregular RCC buildings which will be a new or important aspect of the study. Despite the fact that fewer papers have been published in this area than in others, this report covers a broad range of research efforts and progress into the New Performance based Plastic Design method & seismic behavior of irregular buildings, demonstrating the field’s growing interest.

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