Kinetics Analysis and Simulations on Load Fork Mechanism in Forward-Type Stacker

2010 ◽  
Vol 37-38 ◽  
pp. 608-613
Author(s):  
Jian Yu Bai ◽  
Senlin Tong ◽  
Zai He Yu ◽  
Di Zheng
Keyword(s):  
Static Strength ◽  
Strength Analysis ◽  
Static Force ◽  
Force Analysis ◽  
Kinetics Analysis ◽  
Strength Design ◽  
Simulation Results

It is frequently reported by customers that the lower-left and lower-right wheels in the load fork mechanism of a kind of forward-type stacker designed based on static strength analysis are abraded faster than expected. In this paper, we studied by means of kinetics analysis and simulations the forces applied on parts of the fork mechanism. The simulation results show that the maximum values of instantaneous forces during operations are much higher than those derived based static force analysis, and thus explained the reason of the above-mentioned abnormal abrasion. The results also mean that static force analysis is not suitable for part strength design. Instead, one shall adopt kinetics analysis to explore the instantaneous forces in design.

Structure Strength Analysis on a Steel Chimney Outer Wall with Three Spiral Guide Plates

2014 ◽  
Vol 513-517 ◽  
pp. 2625-2628
Author(s):  
Xu Lei Deng ◽  
Jia Ning He ◽  
Chao Zhang
Keyword(s):  
Flexural Strength ◽  
Fluid Mechanics ◽  
Outer Wall ◽  
Wind Loads ◽  
Strength Analysis ◽  
Structure Stability ◽  
Static Force ◽  
Force Analysis ◽  
Structure Strength ◽  
Ansys Workbench

Study on a steel chimney outer wall with three spiral guide plates in this paper. Research the steel chimney structure stability and static force analysis under wind loads by using ANSYS Workbench and CFX fluid mechanics modular. To prove the steel chimney with three spiral guide plates structure is more safe and stable than the old steel chimney. Provides a new transformation basis of the steel chimney as the ratio of height to diameter is large and low flexural strength.

scholarly journals Static Force Analysis of a 3-DOF Robot for Spinal Vertebral Lamina Milling

Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 29
Author(s):  
Shaodong Li ◽  
Peiyuan Gao ◽  
Hongjian Yu ◽  
Mingqi Chen
Keyword(s):  
Screw Theory ◽  
Kinematic Model ◽  
Force Model ◽  
Static Force ◽  
Force Analysis ◽  
Joint Force ◽  
Simulation Results ◽  
The Mathematical Model ◽  
Human Robot Collaboration

In order to realize robot-assisted spinal laminectomy surgery and meet the clinical needs of the robot workspace, including accuracy in human–robot collaboration, an asymmetrical 3-DOF spatial translational robot is proposed, which can realize spinal laminectomy in a fixed posture. First, based on the screw theory, the constraint screw system of the robot was established, and the degree of freedom was derived to verify the spatial translational ability of the robot. Then, a kinematic model of the robot was established, and a static force model of the robot was derived based on the kinematic model. The mathematical relationship between the external force and the joint force/torque was obtained, with the quality of all links considered in the model. Finally, we modeled the robot and imported it into ADAMS to obtain the static force simulation results of the 3D model. The force error was approximately 0.001 N and the torque error was approximately 0.0001 N∙m compared with the simulation results of the mathematical model, accounting for 1% of the joint force/torque, which is acceptable. The result also showed the correctness of the mathematical models, and provides a theoretical basis for motion control and human–robot collaboration.

Direct Differential Kinematics of Hybrid-Chain Manipulators Including Singularity and Stability Analyses

1994 ◽  
Vol 116 (2) ◽  
pp. 614-621 ◽  
Author(s):  
Yong-Xian Xu ◽  
D. Kohli ◽  
Tzu-Chen Weng
Keyword(s):  
Stability Index ◽  
Inverse Kinematic ◽  
Degree Of Freedom ◽  
Static Force ◽  
Force Analysis ◽  
Kinematic Singularity ◽  
Numerical Examples ◽  
Transformation Matrices ◽  
Unstable Configuration ◽  
Direct Kinematics

A general formulation for the differential kinematics of hybrid-chain manipulators is developed based on transformation matrices. This formulation leads to velocity and acceleration analyses, as well as to the formation of Jacobians for singularity and unstable configuration analyses. A manipulator consisting of n nonsymmetrical subchains with an arbitrary arrangement of actuators in the subchain is called a hybrid-chain manipulator in this paper. The Jacobian of the manipulator (called here the system Jacobian) is a product of two matrices, namely the Jacobian of a leg and a matrix M containing the inverse of a matrix Dk, called the Jacobian of direct kinematics. The system Jacobian is singular when a leg Jacobian is singular; the resulting singularity is called the inverse kinematic singularity and it occurs at the boundary of inverse kinematic solutions. When the Dk matrix is singular, the M matrix and the system Jacobian do not exist. The singularity due to the singularity of the Dk matrix is the direct kinematic singularity and it provides positions where the manipulator as a whole loses at least one degree of freedom. Here the inputs to the manipulator become dependent on each other and are locked. While at these positions, the platform gains at least one degree of freedom, and becomes statically unstable. The system Jacobian may be used in the static force analysis. A stability index, defined in terms of the condition number of the Dk matrix, is proposed for evaluating the proximity of the configuration to the unstable configuration. Several illustrative numerical examples are presented.

Static strength analysis of CANDU-6 reactor fuel bundle

2000 ◽  
Vol 200 (3) ◽  
pp. 407-419 ◽  
Author(s):  
Moon-Sung Cho ◽  
Ki-Seob Sim ◽  
Ho Chun Suk ◽  
Seok-Kyu Chang
Keyword(s):  
Static Strength ◽  
Reactor Fuel ◽  
Strength Analysis ◽  
Fuel Bundle

Compressive Strength Analysis of MWD Microchip Tracer

2014 ◽  
Vol 511-512 ◽  
pp. 561-564
Author(s):  
Ji Bo Li ◽  
Wei Ning Ni ◽  
San Guo Li ◽  
Zu Yang Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Compressive Strength ◽  
Working Conditions ◽  
Failure Criterion ◽  
Strength Analysis ◽  
Design Phase ◽  
Key Issues ◽  
Simulation Results ◽  
Better Than

Pressure resistant performance of Measure While Drilling (MWD) microchip tracer to withstand the harsh downhole environment is one of the key issues of normal working. Therefore, it is an effective way to analyze pressure resistant performance of the tracer in the design phase. Compressive strength of the tracer was studied based on finite element method. Considering downhole complexity and working conditions during the processing of tracer roundness, material non-uniformity and other factors. In this study, researchers took sub-proportion failure criterion to determine the failure of tracer. Simulation results of two structures, with pin and without pin, show that both structures met the requirement of downhole compressive strength, and the structure with pin was better than the structure without pin. This study provides basis for downhole application of microchip tracers.

Strength Analysis of Parallel Grooved Drum

2013 ◽  
Vol 387 ◽  
pp. 115-119
Author(s):  
Qing Zhang ◽  
Kun Zhao ◽  
Ying Yue Xiao ◽  
Xian Rong Qin ◽  
Yuan Tao Sun ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Wall Thickness ◽  
Structure Design ◽  
Strength Analysis ◽  
Design And Optimization ◽  
Simulation Results

Only the basic wall thickness of drum is taken under consideration in traditional parallel grooved drum strength analysis, which is quite conservative for ignoring the thickness of the groove. So in this paper, it is aimed at comparing the strength simulation results for two drum models with and without the thickness of the groove and analyzing the stress distribution of the drum structure, which provides reference for the structure design and optimization of the drum.

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