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Consistent and Minimal Springback Using a Stepped Binder Force Trajectory and Neural Network Control

by Jian Cao, Brad Kinsey, Sara A. Solla
"... One of the greatest challenges of manufacturing sheet metal parts is to obtain consistent part dimensions. Springback, the elastic material recovery when the tooling is removed, is the major cause of variations and inconsistencies in the final part geometry. Obtaining a consistent and desirable amou ..."
Abstract - Cited by 4 (0 self) - Add to MetaCart
amount of springback is extremely difficult due to the non-linear effects and interactions between process and material parameters. In this paper, the exceptional ability of a neural network along with a stepped binder force trajectory to control springback angle and maximum principal strain in a

Comparison of Center of Force Trajectory during Sit-to-stand Movements Performed by Elderly and Old-old Elderly Subjects

by Min-hee Kim, Won-gyu Yoo
"... Abstract. [Purpose] This study compared the center of force (COF) trajectory during sit-to-stand (STS) move-ments performed by elderly and old-old elderly subjects. [Subjects] We recruited 9 elderly and 10 old-old elderly subjects with no knee joint pain or lower limb orthopedic problems. [Methods] ..."
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Abstract. [Purpose] This study compared the center of force (COF) trajectory during sit-to-stand (STS) move-ments performed by elderly and old-old elderly subjects. [Subjects] We recruited 9 elderly and 10 old-old elderly subjects with no knee joint pain or lower limb orthopedic problems. [Methods

A Closed-loop Type Algorithm for Determination of Variable Blank Holder Force Trajectory and its Application to Square Cup Deep Drawing

by Satoshi Kitayama, Satoshi Hamano, Koetsu Yamazaki, Tatsuo Kubo, et al. , 2010
"... In deep drawing, a low blank holder force (BHF) can cause wrinkling, while a high BHF can lead to tearing. Thus, it is important to determine the appropriate BHF to be utilized in the forming process. In this study, a variable blank holder force (VBHF) approach to deep drawing is employed, and a sim ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
In deep drawing, a low blank holder force (BHF) can cause wrinkling, while a high BHF can lead to tearing. Thus, it is important to determine the appropriate BHF to be utilized in the forming process. In this study, a variable blank holder force (VBHF) approach to deep drawing is employed, and a

Refinement of the AMBER Force Field for Nucleic Acids: Improving the Description of a/g Conformers

by Alberto Pérez, Y Iván Marchán, Y Daniel Svozil, Z Jiri Sponer, Thomas E. Cheatham Iii, Charles A. Laughton, Modesto Orozco Y , 2007
"... ABSTRACT We present here the parmbsc0 force field, a refinement of the AMBER parm99 force field, where emphasis has been made on the correct representation of the a/g concerted rotation in nucleic acids (NAs). The modified force field corrects overpopulations of the a/g (g1,t) backbone that were se ..."
Abstract - Cited by 178 (31 self) - Add to MetaCart
ABSTRACT We present here the parmbsc0 force field, a refinement of the AMBER parm99 force field, where emphasis has been made on the correct representation of the a/g concerted rotation in nucleic acids (NAs). The modified force field corrects overpopulations of the a/g (g1,t) backbone that were

Capabilities, Cognition and Inertia: Evidence from Digital Imaging

by Mary Tripsas, Giovanni Gavetti - FORTHCOMING IN STRATEGIC MANAGEMENT JOURNAL , 2000
"... There is empirical evidence that established firms often have difficulty adapting to radical technological change. Although prior work in the evolutionary tradition emphasizes the inertial forces associated with the local nature of learning processes, little theoretical attention has been devoted ..."
Abstract - Cited by 200 (2 self) - Add to MetaCart
There is empirical evidence that established firms often have difficulty adapting to radical technological change. Although prior work in the evolutionary tradition emphasizes the inertial forces associated with the local nature of learning processes, little theoretical attention has been devoted

Calculating structures and free energies of complex molecules: combining molecular mechanics and continuum models

by Peter A. Kollman, Irina Massova, Carolina Reyes, Bernd Kuhn, Shuanghong Huo, Lillian Chong, Matthew Lee, Taisung Lee, Yong Duan, Wei Wang, Oreola Donini, Piotr Cieplak, David A. Case, Thomas E. Cheatham - Acc. Chem. Res
"... A historical perspective on the application of molecular dynamics (MD) to biological macromolecules is presented. Recent develop-ments combining state-of-the-art force fields with continuum solvation calculations have allowed us to reach the fourth era of MD applications in which one can often deriv ..."
Abstract - Cited by 180 (6 self) - Add to MetaCart
A historical perspective on the application of molecular dynamics (MD) to biological macromolecules is presented. Recent develop-ments combining state-of-the-art force fields with continuum solvation calculations have allowed us to reach the fourth era of MD applications in which one can often

Quantification of Relativistic Perturbation Forces on Spacecraft Trajectories By

by Nicholas Palma Mastricola, Nicholas Palma, Mr. Nicholas, Palma Mastricola, Mmx N. P. Mastricola , 2010
"... Quantification of relativistic perturbation forces on spacecraft trajectories ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Quantification of relativistic perturbation forces on spacecraft trajectories

Evolution equations and their trajectory attractors

by V. Chepyzhov, Mark I. Vishik - J. Math. Pures Appl , 1997
"... A compact set Q e E is said to be a global attractor of a semigroup {S(t), t> 0} acting in a Banach or Hilbert space E if!2t is strictly invariant with respect to {S(t)} : S(t) % = 9l Vt> 0 and 9l attracts any bounded set B c E: dist(S(t)B, U) + 0 (t-+ +xX;). A reach variety of works has been ..."
Abstract - Cited by 31 (5 self) - Add to MetaCart
’: sup,cn dist(U(t + T, T)B, A)-3 0 (t-+ +cm) (see [14], [2]). The present paper deals with a trajectory attractor of a given non-autonomous evolution equation. The existence and the structure of trajectory attractors are treated. In particular we study evolution equations and systems arising

Trajectory Adjustments Underlying Task-Specific Intermittent Force Behaviors and Muscular Rhythms

by unknown authors
"... Force intermittency is one of the major causes of motor variability. Focusing on the dynamics of force intermittency, this study was undertaken to investigate how force trajectory is fine-tuned for static and dynamic force-tracking of a comparable physical load. Twenty-two healthy adults performed t ..."
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Force intermittency is one of the major causes of motor variability. Focusing on the dynamics of force intermittency, this study was undertaken to investigate how force trajectory is fine-tuned for static and dynamic force-tracking of a comparable physical load. Twenty-two healthy adults performed

Trajectory and Force Control of a Manipulator With Elastic Links

by Katsuyoshi Tsujita, Kazuo Tsuchiya - Journal of Vibration and Control , 2004
"... Abstract: This paper deals with trajectory and force control of a two-link manipulator with elastic links. The manipulator has a macro–micro mechanism and at the tip of which is an end-effector with a force sensor. Equations of motion are first derived by using a finite-element method for the elasti ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
Abstract: This paper deals with trajectory and force control of a two-link manipulator with elastic links. The manipulator has a macro–micro mechanism and at the tip of which is an end-effector with a force sensor. Equations of motion are first derived by using a finite-element method
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