Tensile Damage Analysis Method for Composite Laminates Using a Quasi-3-Dimensional Model.

Abstract A concept for the initial stage of the mechanical design and its implementation in the computer-aided design (CAD) are presented. The process of decision making in design is: (1) determining an outline of the whole assembly using a 2-dimensional model that is easy to operate; (2) checking the outline using a 3-dimensional model in which it is easy to identify the spatial relationships; (3) determining details of its sub-assemblies or their components using the 2-dimensional model; and (4) checking the details using the 3-dimensional model. The CAD system must provide consistent relationships through all the steps. For that, following functions are implemented in our prototype system: (1) a 2D and 3D integrated model for consistency between 2- and 3-dimensional shapes, (2) a hierarchical assembly model with dimensional constraints for consistency within an assembly and their components, and (3) a check on constraints for consistency between shapes and designers’ intentions. As a result, the system can provide an environment well fitted to the designers’ decision making process.

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A Light Weight Compliant Hand Mechanism With High Degrees of Freedom

Journal of Biomechanical Engineering ◽

10.1115/1.2052805 ◽

2005 ◽

Vol 127 (6) ◽

pp. 934-945 ◽

Cited By ~ 8

Author(s):

Jason Potratz ◽

Jingzhou Yang ◽

Karim Abdel-Malek ◽

Esteban Peña Pitarch ◽

Nicole Grosland

Keyword(s):

Degrees Of Freedom ◽

Static Load ◽

Current Control ◽

Deformation Analysis ◽

Dimensional Model ◽

3 Dimensional ◽

Wrist Flexor ◽

Compression Spring ◽

Extensor Muscles ◽

Control Scheme

This paper presents the design and prototyping of an inherently compliant lightweight hand mechanism. The hand mechanism itself has 15 degrees of freedom and five fingers. Although the degrees of freedom in each finger are coupled, reducing the number of independent degrees of freedom to 5, the 15 degrees of freedom of the hand could potentially be individually actuated. Each joint consists of a novel flexing mechanism that is based on the loading of a compression spring in the axial and transverse direction via a cable and conduit system. Currently, a bench top version of the prototype is being developed; the three joints of each finger are coupled together to simplify the control system. The current control scheme under investigation simulates a control scheme where myoelectric signals in the wrist flexor and extensor muscles are converted in to x and y coordinates on a control scheme chart. Static load-deformation analysis of finger segments is studied based on a 3-dimensional model without taking the stiffener into account, and the experiment validates the simulation.

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Development of a nine degree of freedom, 3 dimensional model for kinematic neck analysis

Journal of Biomechanics ◽

10.1016/0021-9290(94)90183-x ◽

1994 ◽

Vol 27 (5) ◽

pp. 631

Keyword(s):

Degree Of Freedom ◽

Dimensional Model ◽

3 Dimensional

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