Results 81 to 90 of about 34,568 (304)

EFFECT OF PRELOAD OF ANGULAR CONTACT BALL BEARINGS ON LIFE OF BEARINGS [PDF]

Scientific Journal of Silesian University of Technology. Series Transport, 2014
Angular contact ball bearings are commonly used in such situations when you need to reach high bearing stiffness. However, a significant stiffness increase can be achieved only through the introduction of preload to the angular contact bearings.
Andrzej RACZYŃSKI, Jarosław KACZOR
doaj  

Dynamic preload control of traveling wave rotary ultrasonic motors for energy efficient operation

Japanese Journal of Applied Physics, 2019
Ultrasonic motors (USM) have great potential to become the actuators of the next generation. However, the current control schemes of USM are still suffering from some shortcomings including limitation of output speed and torque range, and excessive heat ...
Abdullah Mustafa, T. Morita
semanticscholar   +1 more source

Continuum Mechanics Modeling of Flexible Spring Joints in Surgical Robots

Advanced Robotics Research, EarlyView.
A new mechanical model of a tendon‐actuated helical extension spring joint in surgical robots is built using Cosserat rod theory. The model can implicitly handle the unknown contacts between adjacent coils and numerically predict spring shapes from straight to significantly bent under actuation forces.
Botian Sun, Liang Zhang, Jianwen Zeng, Xuefeng Wang   +3 more
wiley   +1 more source

Analysis and Optimization for the Sealing Performance of Ultra-High Pressure Solenoid Valves in Low-Temperature Environments

Applied Sciences
The sealing performance of ultra-high-pressure solenoid valves faces significant challenges, particularly under low-temperature conditions. Due to the difference in thermal expansion coefficients between the valve seat and the sealing tube, combined with
Tiantian Huang, Yanhao Wu, Changbo Shi, Liang Cai   +3 more
doaj   +1 more source

Universal Gripper for Industrial Manipulation With Enhanced Rigid Mechanics and Self‐Adaptable Fingers

Advanced Robotics Research, EarlyView.
An enhanced universal gripper combining rigid mechanics with self‐adaptable fingers is presented for industrial automation. The novel six‐bar linkage with integrated compliant pad eliminates mechanical interference while enabling passive shape adaptation.
Muhammad Usman Khalid, Nirmal Kumar Ravikumar, Mattia Frascio, Sumanth Nagalakunta, Alessandro Seitone, Benoît Lévesque, Alessandro Zanella, Matteo Zoppi   +7 more
wiley   +1 more source

Preload design and modal-analysis-based verification of a cam-driven opto-mechanical zoom mechanism for deep-space exploration

Advances in Mechanical Engineering
Accurate preload design is essential for the stiffness, dynamic stability, and driving reliability of precision opto-mechanical systems. This study investigates a cam-driven zoom mechanism with miniature ball bearings and spring preloading devices, and ...
Zhexin Duan, Di Lu, Fei Chen, Juan Lv, Bin Xue, Lu Wang, Jirui Yu, Mingda Li, Jianfeng Yang, Fu Li   +9 more
doaj   +1 more source

Phenylephrine increases cardiac output by raising cardiac preload in patients with anesthesia induced hypotension

Journal of clinical monitoring and computing, 2018
Induction of general anesthesia frequently induces arterial hypotension, which is often treated with a vasopressor, such as phenylephrine. As a pure α-agonist, phenylephrine is conventionally considered to solely induce arterial vasoconstriction and thus
A. Kalmar, S. Allaert, P. Pletinckx, J-W Maes, Jan Heerman, J. Vos, M. Struys, M. Struys, T. Scheeren   +8 more
semanticscholar   +1 more source

The reliability of responses to repeated laboratory assessment: the evaluation of a preload-performance protocol in runners

, 2011
A number of protocols associated with endurance performance have been presented in the literature where participants have had to endure a ‘preload’ phase (at a fixed relative intensity) followed by a ‘performance’ self paced phase.
Wiles, J., Baker, D., Coleman, D.
core  

Mean appetite composite scores (100-mm VAS) on the preload and no-preload test days across measurement time points.

, 2015
Errors bars represent ± 1 SE from the mean. Appetite composite scores were calculated using the following formula: (hunger + (100-fullness))/2. * significant difference between preload day and no-preload day, p
Lesley Kyle (732169), Jeffrey M. Brunstrom (295769), Peter J. Rogers (295773), Charlotte A. Hardman (732168), Danielle Ferriday (295778)   +4 more
core   +1 more source

A Soft Robotic Fish With a Dielectric Elastomer Actuator Body and Negative Stiffness Spine

Advanced Robotics Research, EarlyView.
This work introduces a bio‐mimetic soft robotic fish driven by fiber‐reinforced dielectric elastomer actuators integrated as its body. By prestretching this active skin against a flexible spine, a negative stiffness system is created, enabling large‐amplitude bending.
Markus Koenigsdorff, Simon Holzer, Stefania Konstantinidi, Yoan Civet, Yves Perriard   +4 more
wiley   +1 more source