scholarly journals Analysis and Simulation of Impact Problem of Metamorphic Mechanism Considering Configuration Transformation

2020 ◽  
Vol 56 (17) ◽  
pp. 48
Author(s):  
SONG Yanyan ◽  
CHANG Boyan ◽  
JIN Guoguang ◽  
WEI Zhan ◽  
LI Bo
2013 ◽  
Vol 655-657 ◽  
pp. 421-424
Author(s):  
Sheng Hai Hu ◽  
Xiu Lian Liu ◽  
Hong Guang Wang ◽  
Xiao Dong Zhang

The impact problem is analyzed when the complex-surface cutting metamorphic mechanism changes the configuration through ADAMS, assuring that the impact is decreased to minimum by changing the motion law of driving joint. The effectiveness of this method is verified through simulation, ensuring the stability of metamorphic mechanism in configuration transformation.


2021 ◽  
pp. 1-26
Author(s):  
Ruth Schmidt ◽  
Katelyn Stenger

Abstract Despite widespread recognition that behavioral public policy (BPP) needs to move beyond nudging if the field is to achieve more significant impact, problem-solving approaches remain optimized to achieve tactical success and are evaluated by short-term metrics with the assumption of stable systems. As a result, current methodologies may contribute to the development of solutions that appear well formed but become ‘brittle’ in the face of more complex contexts if they fail to consider important contextual cues, broader system forces, and emergent conditions, which can take three distinct forms: contextual, systemic, and anticipatory brittleness. The Covid-19 pandemic and vaccination rollout present an opportunity to identify and correct interventional brittleness with a new methodological approach – strategic BPP (SBPP) – that can inform the creation of more resilient solutions by embracing more diverse forms of evidence and applied foresight, designing interventions within ecosystems, and iteratively developing solutions. To advance the case for adopting a SBPP and ‘roughly right’ modes of inquiry, we use the Covid-19 vaccination rollout to define a new methodological roadmap, while also acknowledging that taking a more strategic approach may challenge current BPP norms.


2004 ◽  
Vol 48 (1) ◽  
pp. 27-42 ◽  
Author(s):  
Anatoli Leontiev ◽  
Ronaldo S. Busse ◽  
Wilma Huacasi

2000 ◽  
Author(s):  
Songbin Wei ◽  
Imin Kao

Abstract In wiresaw manufacturing process where thin wire moving at high speed is pushed onto ingot to produce slices of wafer, the wire is constrained by two wafer walls as it slices into the ingot. In this paper, we investigate the vibration of such wire under the constraints of wafer walls. To address this problem, the model for wire vibration with impact to wafer walls is developed. The equation of motion is discretized using the Galerkin’s method. The principle of impulse and momentum is utilized to solve the impact problem. The results of analysis and simulation indicate that the response under a pointwise sinusoidal excitation is neither periodical nor symmetric with respect to the horizontal axis, due to the excitation from the impact. The wire vibration behavior is affected dramatically by the wafer wall constraints.


1999 ◽  
Author(s):  
Leszek Demkowicz ◽  
Andrzej Bajer

Abstract A discretization scheme for contact/impact problems related to the modeling of gears is proposed. The problem is first discretized in time and then a variational formulation for the resulted one step problem is developed. A Finite Element discretization completes the discretization process. The scheme is reinterpretation of the general Simo-Laursen-Chavla algorithm in the contest of rigid body motion superimposed with small elastic deformation; it conserves precisely linear momentum and total energy, and approximately the angular momentum. The discretization method is illustrated with two numerical examples: the standard 1D impact problem for an elastic rod, and a 2D model problem of an elastic wheel bouncing within a constraining box.


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