A Micro Helico-Kinematic Platform via Spherical Crank Sliders

2004 ◽  
Author(s):  
Craig P. Lusk ◽  
Larry L. Howell
Keyword(s):  
Virtual Work ◽  
Full Range ◽  
Vertical Motion ◽  
Helical Motion ◽  
Plane Rotation ◽  
Stick Slip ◽  
Optical Components ◽  
Analysis Techniques ◽  
Out Of Plane ◽  
Design Freedom

A novel surface micromachined mechanism, the Micro Helico-Kinematic Platform (MHKP), is presented. The MHKP achieves a combination of vertical out-of-plane translation and in-plane rotation (helical motion) of a platform with an in-plane rotational input. The motion achieved requires specialized analysis techniques in spherical kinematics and introduces the micro spherical crank-slider. Spherical kinematic concepts are reviewed to aid in describing the motion and conveying the scope of the device’s design freedom. The force and displacement relations for the mechanism are derived using virtual work techniques. A surface micromachined prototype was fabricated and tested. Testing indicates that the sliding interface between the spherical crank sliders and the platform results in some stick-slip friction and that the mechanism is able to achieve its full range of motion. The vertical motion of the platform can be advantageous in micro manipulation applications such as the positioning of micro-optical components.

Wavelet-modified maximum average correlation height filter for out-of-plane rotation invariance

Optik ◽  
2009 ◽  
Vol 120 (2) ◽  
pp. 62-67 ◽  
Author(s):  
Shilpi Goyal ◽  
Naveen K. Nishchal ◽  
Vinod K. Beri ◽  
Arun K. Gupta
Keyword(s):  
Rotation Invariance ◽  
Plane Rotation ◽  
Average Correlation ◽  
Out Of Plane

Prototyping micro-optical components with integrated out-of-plane coupling structures using deep lithography with protons

2006 ◽  
Author(s):  
Jürgen Van Erps ◽  
Lawrence Bogaert ◽  
Bart Volckaerts ◽  
Christof Debaes ◽  
Hugo Thienpont
Keyword(s):  
Optical Components ◽  
Out Of Plane

Surface Micromachined Polysilicon Components Containing Continuous Hinges and Microrivets Used to Realize Three-Dimensional MEMS Structures

2001 ◽  
Vol 687 ◽  
Author(s):  
Edward S. Kolesar ◽  
Matthew D. Ruff ◽  
William E. Odom ◽  
Simon Y. Ko ◽  
Jeffery T. Howard ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Dimensional Structure ◽  
Plane Rotation ◽  
Arrow Head ◽  
Three Dimensional Structure ◽  
Out Of Plane ◽  
Open Window ◽  
Pass Through ◽  
Glass Reinforcement

AbstractA new polysilicon surface micromachining technique for fabricating and assembling three- dimensional structures has been developed. Single-layer polysilicon elements and laminated polysilicon panels incorporating trapped-glass reinforcement ribs have been successfully fabri- cated on a silicon substrate with robust and continuous hinges that facilitate out-of-plane rotation and assembly. To realize a stable three-dimensional structure, one of the device's elevatable panel components is terminated with an array of open windows, and the mating rotatable element has a matched set of protruding arrowheads/microrivets with flexible barbs that readily flex to facilitate their joining and assembly. Because the arrowhead/microrivet barb tip-to-barb tip sepa- ration is larger than the opening in the mating window, the barbs flex inward as they pass through the open window and then expand to their original shape upon exiting the window, re- sulting in a permanently latched joint and a three-dimensional structure. Three novel arrow- head/microrivet designs have been micromachined to facilitate the latching process, including a simple arrowhead, a high-aspect ratio arrowhead, and a rivet-like structure with a hemispherical shaped cap and a flexible split shank.

Dynamic Analysis of an Elevator Traveling Cable Using a Singularity-Free Beam Formulation

2017 ◽  
Vol 84 (4) ◽  
Author(s):  
W. Fan ◽  
W. D. Zhu
Keyword(s):  
Dynamic Analysis ◽  
Multibody Dynamics ◽  
Natural Frequencies ◽  
Vertical Motion ◽  
Dynamic Responses ◽  
Mode Shapes ◽  
Out Of Plane ◽  
Forced Responses ◽  
Free Beam ◽  
Good Agreement

A round elevator traveling cable is modeled using a singularity-free beam formulation. Equilibria of the traveling cable with different elevator car positions are studied. Natural frequencies and the corresponding mode shapes of the traveling cable are calculated and they are in excellent agreement with those calculated by abaqus. In-plane natural frequencies of the traveling cable do not change much with the car position compared with its out-of-plane ones. Dynamic responses of the traveling cable are calculated and they are in good agreement with those from commercial multibody dynamics software recurdyn. Effects of vertical motion of the car on free responses of the traveling cable and those of in-plane and out-of-plane building sways on forced responses are investigated.

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