Structure Design and Modal Analysis for a New Type of Cycloidal Drives

2016 ◽  
Author(s):  
Special Issues Editor
Keyword(s):  
Modal Analysis ◽  
Structure Design ◽  
New Type

Dynamic Characteristics Analysis of Cable-Rib Tension Deployable Antenna

2016 ◽  
Author(s):  
Liu Ruiwei ◽  
Hongwei Guo ◽  
Zhang Qinghua ◽  
Rongqiang Liu ◽  
Tang Dewei
Keyword(s):  
Dynamic Characteristics ◽  
Structural Parameters ◽  
Element Model ◽  
Structure Design ◽  
Antenna Structure ◽  
Characteristics Analysis ◽  
New Type ◽  
Dynamic Characteristics Analysis ◽  
The Finite Element Model ◽  
Weight Dynamic

Balancing stiffness and weight is of substantial importance for antenna structure design. Conventional fold-rib antennas need sufficient weight to meet stiffness requirements. To address this issue, this paper proposes a new type of cable-rib tension deployable antenna that consists of six radial rib deployment mechanisms, numerous tensioned cables, and a mesh reflective surface. The primary innovation of this study is the application of numerous tensioned cables instead of metal materials to enhance the stiffness of the entire antenna while ensuring relatively less weight. Dynamic characteristics were analyzed to optimize the weight and stiffness of the antenna with the finite element model by subspace method. The first six orders of natural frequencies and corresponding vibration modes of the antenna structure are obtained. In addition, the effects of structural parameters on natural frequency are studied, and a method to improve the rigidity of the deployable antenna structure is proposed.

Study on the Integrated Design of Underground Construction Lighting and Ventilation System

2011 ◽  
Vol 374-377 ◽  
pp. 702-705
Author(s):  
Wei Feng ◽  
Hui Min Li
Keyword(s):  
Numerical Simulation ◽  
Thermal Environment ◽  
Ventilation System ◽  
Integrated Design ◽  
Structure Design ◽  
Light Environment ◽  
System Model ◽  
Underground Construction ◽  
New Type

In the underground building, Light environment and thermal environment is poorer, in order to improve the problem, this paper brings forward a new type of lighting and ventilation system model; discusses the principle and characteristics of transmission; and analyses the question that influences lighting and ventilated effect in the application. Structure design and numerical simulation is the focus of the next step.

Design and analysis of a propulsion mechanism using modular umbrella-like wings

2018 ◽  
Vol 122 (1249) ◽  
pp. 349-368
Author(s):  
F. Gao ◽  
J. G. Lv ◽  
X. C. Zhang
Keyword(s):  
Structural Model ◽  
Aerodynamic Force ◽  
Inertial Force ◽  
Structure Design ◽  
Symmetrical Structure ◽  
Propulsion Mechanism ◽  
New Type ◽  
Practical Guidance ◽  
Mechanical Performances ◽  
Relationship Of

ABSTRACTThis article describes the design and evaluation of a new type of propulsion mechanism that uses modular umbrella-like wings oscillating symmetrically in counterphase to generate thrust. The principle of the propulsion and movement of the modular umbrella-like wings was first developed, and the mechanism used to implement the movement of the modular wings was subsequently designed. A structural model and the assembly relationship of the propulsion mechanism were developed for prototype fabrication. An experiment was established to measure the kinematic and mechanical performances of the propulsion mechanism for different reciprocating frequencies and travels. The results for the single umbrella-like wing indicate that either increasing the frequency or enlarging the travel can enhance the average aerodynamic force generated by the wing in one cycle. The results for the modular umbrella-like wings demonstrate that the inertial force generated by the mechanism can be balanced using a symmetrical structure. The average aerodynamic force would be markedly enhanced by increasing the percentage of the time that the outspread wing is moving downwards; e.g. the average aerodynamic force generated by the modular umbrella-like wings was increased by 85.84% compared to the value for a single umbrella-like wing for the same travel and frequency. This work provides practical guidance for optimising the structure design.

Design and analysis of a new frame-foot wall-climbing robot

2021 ◽  
pp. 095440702110402
Author(s):  
Ping Huo ◽  
Yangyang Xu ◽  
Jiangtao Yu ◽  
Yazhou Wang
Keyword(s):  
Structure Design ◽  
Working Environment ◽  
Structure Stability ◽  
Foot Wall ◽  
Climbing Robot ◽  
3D Design ◽  
Motion Equations ◽  
Solution Models ◽  
New Type ◽  
The Stability

This paper designs and develops a new type of frame-foot wall-climbing robot structure. According to the bionic principle, a new parallel telescopic leg structure is proposed, and the 3D design of the overall structure of the wall-climbing robot is completed. Secondly, the kinematics analysis of the robot is carried out, and the forward and inverse solution models of the leg structure position are completed to verify the feasibility of the leg structure stability. Based on the polynomial motion equations, the robot motion planning and gait design are established, and the speed and acceleration change graphs of the leg structure slider are obtained, which avoids the rigid impact between the parts, and realizes the alternate adsorption and continuous movement of the robot legs, which the rationality of the legs structure design and the stability of the movement are verified. Through simulation and experimental results, it is shown that during the robot’s movement, the leg structure can adjust the step distance and step height according to obstacles, so as to achieve the expected obstacle crossing goal. The leg structure is adjusted according to the working environment to ensure that the fuselage and the working surface are always kept parallel to improve the stability of the overall structure.

Finite Element Analysis Based on ANSYS of Bolt of Roof Bolter

2014 ◽  
Vol 926-930 ◽  
pp. 3042-3045
Author(s):  
Si Cong Yuan ◽  
Xin Guo ◽  
Xiao Yu Wang ◽  
Xi Yong Pei
Keyword(s):  
Modal Analysis ◽  
Static Analysis ◽  
Three Dimensional ◽  
Structure Design ◽  
Element Analysis ◽  
Shaft Diameter ◽  
Natural Modes ◽  
Roof Bolter ◽  
Solid Models ◽  
Reasonable Choice

The three-dimensional solid models of five different length and shaft diameter anchor of bolt were constructed based on ANSYS software, and making static analysis and modal analysis on it to obtain the stress nephogram and natural frequency of bolt. Research on the stress condition of bolt in static analysis. In modal analysis, researching on the effect regular of the change of length and shaft diameter size on the bolt transverse vibration, the longitudinal and torsional vibration of three natural modes of different frequency, providing a reference for the structure design and reasonable choice of bolt type for corresponding condition.

Performance of Steel Fiber Reinforced Concrete (SFRC) and its Application in Civil Engineering

2013 ◽  
Vol 788 ◽  
pp. 550-553
Author(s):  
Rong Guo
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Impact Resistance ◽  
Complex Stress ◽  
Structure Design ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Engineering Construction ◽  
New Type

Steel fiber reinforced concrete is a new type of composite material developed rapidly in recent years. It is widely used in various types of engineering construction field with its good crack resistance, flexural toughness and impact resistance. Meanwhile, Steel fiber reinforced concrete has high tensile strength and fracture toughness, fatigue resistance, and forming pouring easy，for variety of complex stress position of the structure. This paper provides something for this new concrete materials in the project of the building structure design and construction, through the introduction of the main performance of steel fiber reinforced concrete.

Movable Angle Cursor Positioning Ruler of Development

2014 ◽  
Vol 971-973 ◽  
pp. 1251-1254
Author(s):  
Ting Hui Ma
Keyword(s):  
Production Process ◽  
Structure Design ◽  
Actual Production ◽  
New Type ◽  
Grinding Machine ◽  
Research And Design

In the actual production process in plane grinder, they often encounter processing with angle plane, and so with angle plane in the grinding before we must locate the workpiece, but in reality the plane grinding machine in the production process is the lack of it can accurately locate the workpiece tool, Therefore, in view of the above in the processing of the existence of the problem, research and design a new type of movable angle cursor positioning ruler, the following discusses the structure design.

Non-Standard Structure Design and Modal Analysis of Embedding Function Module of Tool Holder

2013 ◽  
Vol 446-447 ◽  
pp. 581-584
Author(s):  
Guang Hui Li ◽  
Xu Hong ◽  
Lin Lin Guo ◽  
Wei Bo ◽  
Guang Yu Tan
Keyword(s):  
Modal Analysis ◽  
Dynamic Balance ◽  
Three Dimensional ◽  
Structure Design ◽  
Tool Holder ◽  
Standard Tool ◽  
Standard Structure ◽  
Function Module ◽  
Measuring Tool ◽  
Ansys Workbench

According to the structure and characteristics of the HSK-A63 tool holder, we design and retrofit the non-standard tool holder with special function module. Establish and assemble three-dimensional entity models of embedded temperature measuring tool holder, ER collet/nut and flat end mill with Pro/E 5.0. Based on the establishment of the reasonable boundary conditions and meshing of the tool holder assembly, natural frequency and vibration modes of the tool holder assembly are calculated by modal analysis with the Ansys Workbench. These analysis results are the important research basis for the dynamic characteristics designing and dynamic balance researching to the tool system.

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