scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Actuator

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Wenchuan Zhao ◽  
Yu Zhang ◽  
Ning Wang
Keyword(s):  
Numerical Simulation ◽  
Silica Gel ◽  
Dynamic Characteristics ◽  
Design Method ◽  
Structural Characteristics ◽  
Simulation Method ◽  
Structure Design ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Nonlinear Hyperelasticity

The design of a pneumatic soft-bodied bionic actuator derives from the structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel, which can improve the mobility and environmental adaptability of soft-bodied bionic robots. Based on Yeoh’s second-order constitutive model of silica gel, the deformation analysis model of the actuator is established, and the rationality of the structure design and motion forms of the actuator and the accuracy of the deformation analysis model are verified by using the numerical simulation algorithm. According to the physical model of the pneumatic soft-bodied bionic actuator, the motion and dynamic characteristics of the actuator are tested and analyzed, the curves of motion and dynamic characteristics of the actuator are obtained, and the empirical formula of the bending angle and driving torque of the actuator is fitted out. The results show that the deformation analysis model and numerical simulation method are accurate, and the pneumatic soft-bodied bionic actuator is feasible and effective, which can provide a design method and reference basis for the research and implementation of soft-bodied bionic robot actuator.

scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Basic Execution Unit

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yu Zhang ◽  
Wenchuan Zhao ◽  
Ning Wang ◽  
Dengyu Lu
Keyword(s):  
Physical Model ◽  
Dynamic Characteristics ◽  
Structural Characteristics ◽  
Research Process ◽  
Leaf Spring ◽  
Deformation Analysis ◽  
Maximum Output ◽  
Analysis Model ◽  
Empirical Formulas ◽  
Execution Unit

This paper studies the design of pneumatic soft-bodied bionic basic execution unit with soft-rigid combination, which can be used as an actuator for pneumatic soft-bodied robots and soft-bodied manipulators. This study is inspired by structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel and the insertion of thin leaf spring structure in the nonretractable layer. Response surface analysis and numerical simulation algorithm are used to determine the optimal combination of structural dimension parameters by taking the maximum output bending angle of the basic executing unit as the optimization objective. Based on Odgen’s third-order constitutive model, the deformation analysis model of the basic execution unit is established. The physical model of pneumatic soft-bodied bionic basic execution unit is prepared through 3D printing, shape deposition, soft lithography, and other processing methods. Finally, the motion and dynamic characteristics of the physical model are tested through experiments and result analysis, thus obtaining curves and empirical formulas describing the motion and dynamic characteristics of the basic execution unit. The relevant errors are compared with the deformation analysis model of the execution unit to verify the feasibility and effectiveness of the design of the pneumatic soft-bodied bionic basic execution unit. The above research methods, research process, and results can provide a reference for the research and implementation of pneumatic and hydraulic driven soft-bodied robots and grasping actuators of soft-bodied manipulators.

Calculation and Design Method Study of the Coil-Wound Heat Exchanger

2014 ◽  
Vol 1008-1009 ◽  
pp. 850-860 ◽  
Author(s):  
Zhou Wei Zhang ◽  
Jia Xing Xue ◽  
Ya Hong Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
Design Method ◽  
Fluid Velocity ◽  
Exchange Process ◽  
Three Dimensional ◽  
Simulation Method ◽  
Physical Parameters ◽  
Numerical Result

A calculation method for counter-current type coil-wound heat exchanger is presented for heat exchange process. The numerical simulation method is applied to determine the basic physical parameters of wound bundles. By controlling the inlet fluid velocity varying in coil-wound heat exchanger to program and calculate the iterative process. The calculation data is analyzed by comparison of numerical result and the unit three dimensional pipe bundle model was built. Studies show that the introduction of numerical simulation can simplify the pipe winding process and accelerate the calculation and design of overall configuration in coil-wound heat exchanger. This method can be applied to the physical modeling and heat transfer calculation of pipe bundles in coil wound heat exchanger, program to calculate the complex heat transfer changing with velocity and other parameters, and optimize the overall design and calculation of spiral bundles.

scholarly journals Structure parameter optimization and bearing limit analysis of the expansion unit of three-roller tube expander

2020 ◽  
Vol 7 (5) ◽  
pp. 191630
Author(s):  
Gang Bi ◽  
Zhan Qu ◽  
Zhenquan Wang ◽  
Liangbin Dou ◽  
Mengmeng Li
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Gauge Length ◽  
Structure Design ◽  
Design Parameters ◽  
Roller Tube ◽  
Unit Structure ◽  
Drilling Technology ◽  
Expansion Force ◽  
Proper Length

The critical technical issues for the structure design of three-roller tube expander were first studied and analysed in this paper. Then, the major design parameters of the expansion unit structure and the bearing limit of 12¼″ three-roller tube expander were optimized and investigated by finite-element numerical simulation method. Results from study show that the required expansion force increases when the taper angle of the roller outer surface gets larger, taking the axial expansion force as the quantitative indicators. It is suggested that the roller tape angle of the expansion unit should be in the range of 9–12° considering the proper length of the roller and the non-self-locking tube expansion process. The required expansion force of the bellows first decreases and then increases when the gauge length of the expansion unit becomes longer. The optimal value of the gauge length is 50 mm considering the proper length of the roller. And according to the numerical simulation results, the designed three-roller tube expander meets the strength requirements. The results of this study are of great significance to the expend bellows drilling technology.

The Numerical Simulation Analysis of Irregular Frame Structure Dynamic Characteristics

2013 ◽  
Vol 739 ◽  
pp. 373-375
Author(s):  
Fang Zhang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Structure Design ◽  
Frame Structure ◽  
Ansys Software ◽  
Mass Percentage ◽  
Structure Dynamic ◽  
Characteristics Analysis ◽  
Dynamic Characteristics Analysis

A bump of irregular frame structure as an example, the use of ANSYS software, the structure dynamic characteristics analysis, given the cycle ratio and modal participation mass percentage, as the bump of irregular frame structure design reference.

Cantalever Protection Aluminum Profiles Extrusion Die Design Method and Numerical Simulation

2012 ◽  
Vol 152-154 ◽  
pp. 301-305
Author(s):  
Jian Yi Pan ◽  
Yao Wang ◽  
Zhao Yao Zhou ◽  
Shou Bin Dong
Keyword(s):  
Numerical Simulation ◽  
Material Flow ◽  
Design Method ◽  
Simulation Method ◽  
Die Design ◽  
Design Scheme ◽  
Extrusion Dies ◽  
Cantilever Structure ◽  
Extrusion Die Design ◽  
Stress And Deformation

In order to improve the service life of extrusion dies with long cantilever structure, a design scheme of porthole die for half-hollow profiles with long cantilever was introduced. Using numerical simulation method, compared with conventional method for the half-hollow porthole design method of a typical profile die model, the equilibrium of the material flow at the outlet, the stress and deformation of the die were analyzed in detail. With selection of the cantilever thickness shrinkage as the objective function, experiment was done to verify the result of simulating analysis. The results indicated that there was only little difference for the equilibrium of material flow between the two design schemes, but the stress load and deformation of the design scheme were greatly improved.

The Research of Subspan Oscillation and Configuration of Spacer for Transmission Line

2012 ◽  
Vol 614-615 ◽  
pp. 1855-1861
Author(s):  
Yu Xian Di ◽  
Kuan Jun Zhu ◽  
Cao Lan Liu
Keyword(s):  
Numerical Simulation ◽  
Transmission Lines ◽  
Simulation Method ◽  
Computational Method ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Finite Element Analysis ◽  
Computer Aided ◽  
Calculation Procedures

Based on the summarization of domestic and foreign experience, the computational method of spacer configuration was developed in order to depress sub-span oscillation principally. The requirements of the reverse recovery characteristics were considered. The computer-aided calculation procedures were programmed. The finite element analysis model of sub-span oscillation for cable-spacer system was established. The inherence modal and amplitude for sub-span oscillation of bundled transmission lines were calculated by using numerical simulation method. The dynamic configurations were analyzed by using the parameters of the cable and spacer obtained from vibration testing.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

Adaptive Synthesis of Hydraulic Circuits From Design Cases Based on Functional Structure

1995 ◽  
Author(s):  
Kikuo Fujita ◽  
Shinsuke Akagi ◽  
Makoto Sasaki
Keyword(s):  
Design Method ◽  
Synthesis Method ◽  
Simulation Method ◽  
Structure Design ◽  
Functional Structure ◽  
Case Based Reasoning ◽  
Symbol Manipulation ◽  
Case Base ◽  
Functional Structure Design ◽  
Hydraulic Circuits

Abstract An adaptive synthesis method for hydraulic circuits is proposed by using case-based reasoning technique based on their functional structure. Since synthesis of hydraulic circuits is a typical problem of conceptual design and its property is expertise-oriented and combinatorial, it is difficult to declaratively represent useful design knowledge. In our design method, past design cases are afore-stored in the case base, and then a circuit is generated by arranging suitable past cases which are retrieved from the case base in accordance with the difference related to functional structure. In order to measure such functional structure, design specifications are represented with labels. Design cases are adaptively manipulated into a target design with three synthesis strategies, decomposition, series combination and parallel combination, based on surplus or deficit of labels. Moreover, arranged circuits are verified with a logical simulation method based on symbol manipulation. These synthesis and simulation methods are applied to some design problems in order to show their effectiveness and validity.

Numerical simulation of drive axles considering the nonlinear couplings between gears and bearings

2018 ◽  
Vol 233 (4) ◽  
pp. 851-861
Author(s):  
Chi Zhou ◽  
Qi Wang ◽  
Weiqi Ding ◽  
Liangjin Gui ◽  
Zijie Fan
Keyword(s):  
Numerical Simulation ◽  
Load Condition ◽  
Simulation Method ◽  
Contact Analysis ◽  
Reduced Model ◽  
Analysis Model ◽  
Gear Mesh ◽  
Stiffness Matrices ◽  
Drive Axle ◽  
Nonlinear Couplings

The drive axle is the core of the powertrain in automotive vehicles, and numerical simulation is a common and effective approach for designing and analysing drive axles. This article develops a new numerical simulation method for drive axles considering the nonlinear couplings between gears and bearings. Two types of models are proposed and integrated: a reduced model with nonlinear bearing elements and equivalent gear elements, which is efficient for nonlinear bearing simulation, and a gear contact analysis model with equivalent bearing stiffnesses, which can accurately reflect the gear mesh conditions and system deflection. The equivalent gear mesh parameters used in the reduced model are derived from the contact analysis model, and the linear equivalent bearing stiffness matrices used in the contact analysis model are derived from the reduced model. Therefore, the static equilibrium condition of the entire drive axle system is obtained through an iterative calculation process involving the two models under the same load condition. The good correlation between the numerical and experimental results of the gear-loaded contact pattern indicates that the proposed method is reliable.

Numerical Simulation of the Effect of Spoiler Ribs on the Flow Field in Household Soymilk Maker

2013 ◽  
Vol 483 ◽  
pp. 238-242
Author(s):  
Lian Hua Zhu ◽  
Qiang Song ◽  
Guo Ping Li ◽  
Xiang Bo Ze
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Simulation Method ◽  
Orthogonal Experimental Design ◽  
Soy Milk ◽  
Structure Parameter ◽  
Experimental Design Method ◽  
Velocity Turbulence

The spoiler rib is a auxiliary structure of non mesh enclosure soy milk maker, it plays an important role in the process of crushing soybean. In this paper, we designed an orthogonal experiment according to different structure parameter of the spoiler ribs. By using the numerical simulation method, we can get the law of the flow field. We analysised the velocity, turbulence intensity distribution roles in the flow field of different rib's structure parameter, the model of power consumption. Finally, the optimal solutions were found by numerical orthogonal experimental design method in a several turn.

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