scholarly journals Axial wall angulation for rotational resistance in a theoretical‐maxillary premolar model

2019 ◽  
Vol 5 (6) ◽  
pp. 638-647
Author(s):  
John F. Bowley ◽  
Po Lee ◽  
Wen‐Fu Thomas Lai
Keyword(s):  
Rotational Resistance

scholarly journals Implementation of rotational resistance models: A critical appraisal

Particuology ◽  
2017 ◽  
Vol 34 ◽  
pp. 14-23 ◽  
Author(s):  
Xin Huang ◽  
Kevin J. Hanley ◽  
Catherine O’Sullivan ◽  
Chung-Yee Kwok
Keyword(s):  
Critical Appraisal ◽  
Rotational Resistance

408 Study rotational resistance of automatic transmission by producing skeleton body

2014 ◽  
Vol 2014.63 (0) ◽  
pp. _408-1_-_408-2_
Author(s):  
Hiroshi TSUKUDA ◽  
Tetsuya OHASHI ◽  
Yuga SANO ◽  
Ryuichi TANIMOTO
Keyword(s):  
Automatic Transmission ◽  
Rotational Resistance

scholarly journals Development of a Rotational Resistance Model in Discrete Element Method

2010 ◽  
Vol 47 (4) ◽  
pp. 214-221 ◽  
Author(s):  
Yoshinori Yamada ◽  
Mikio Sakai ◽  
Yusuke Shigeto ◽  
Masao Tsuchiya ◽  
Shuichi Hirayama
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Resistance Model ◽  
Rotational Resistance ◽  
Element Method

scholarly journals Research on Rotational Resistance Moment of Rotary Energy Recovery Device

2018 ◽  
Vol 53 ◽  
pp. 02001
Author(s):  
Ang GUO ◽  
Zuo-dong HUANG ◽  
Zai-ran DING ◽  
Yi SHI ◽  
Lei JIAO ◽  
...  
Keyword(s):  
Energy Recovery ◽  
Rotation Speed ◽  
Structural Characteristics ◽  
Internal Flow ◽  
Operational Conditions ◽  
Clearance Flow ◽  
Resistance Moment ◽  
Changing Trend ◽  
Rotational Resistance ◽  
Rotation Resistance

The effects of operational conditions on the resistance moment of a rotary energy recovery device have been systematically investigated through the computational fluid dynamics in this paper. Based on the structural characteristics of the rotary energy recovery device, the hydro-static bearing was established on both sides of the rotor. Simulation results indicate that for the rotation resistance moment generated by the rotor internal flow path, the rotation speed is linearly positive with the rotational resistance moment. For the rotation resistance moment generated by the clearance flow, the rotation speed is also positively correlated with the rotational resistance moment. The circular clearance size is negatively correlated with the rotation resistance moment, and the endcover fluid film size is negatively correlated with the rotation resistance moment. The boundary speed between laminar flow and turbulent flow was found by comparing the changing trend of rotational resistance moment. The obtained relation between clearance, the speed of the rotor and resistance moment provides a simple way to predict the resistance moment of the device, which will be beneficial to design the energy-efficient rotary energy recovery device

A Study of Haptic Effects in Endovascular Interventions

Mekatronika ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 10-17
Author(s):  
H.R. Ramli ◽  
E. Ako ◽  
M.I. Saripan ◽  
F. Bello
Keyword(s):  
Force Measurement ◽  
Current Knowledge ◽  
Real Life ◽  
Heart Beat ◽  
Online Questionnaire ◽  
Endovascular Interventions ◽  
Measurement Experiment ◽  
Testing Techniques ◽  
Sense Of Touch ◽  
Rotational Resistance

During an endovascular intervention, interventionists rely on their sense of touch to perform the procedures correctly. However, there is a paucity of literature regarding the intricacies of the haptic component of the interventions. The objectives of this study were to capture the types and magnitude of haptic effects during real-life interventions from subject matter experts. The study consisted of an online questionnaire and a force measurement experiment to help determine the force types and magnitude. Participants were interventionists with significant procedural experience. The data recorded from the online questionnaire and the experimental study was analysed using descriptive statistics and hypothesis testing techniques. Participants identified four different types of haptic effects: translational resistance, rotational resistance, bump effect and heart beat pressure effect. The characteristics of each effect, such as factor of occurrence and direction, were established and they were compared against each other. Translational resistance was recognised as the strongest, followed by rotational resistance, bump effect and heart beat pressure. In the force measurement experiment, the forces involved in the generation of translational resistance were found to be in the range 0-0.5 N in healthy vessels, 0.5 – 1.5 N in tortuous/narrowed vessels and 1.5 – 2 N in calcified or occluded vessels. Measurements for the bump effect provided less conclusive results due to its subtle nature, although current findings suggest forces between 0.1 – 0.2 N. Overall, the study was successful in expanding current knowledge of haptic effects in endovascular interventions, highlighting the existence of a variety of effects and their characteristics.

The Capitohamate Ligaments

1996 ◽  
Vol 21 (4) ◽  
pp. 451-454 ◽  
Author(s):  
M.J.P.F. RITT ◽  
R.A. BERGER ◽  
A.T. BISHOP ◽  
K.N. AN
Keyword(s):  
Random Sequence ◽  
Testing Machine ◽  
Human Cadaver ◽  
Rotational Displacement ◽  
Important Constraint ◽  
Translational Displacement ◽  
Load Limit ◽  
Physical Attributes ◽  
Computer Controlled ◽  
Rotational Resistance

The physical attributes of the three capitohamate interosseous ligaments were tested in a computer-controlled multi-axis testing machine using 12 human cadaver specimens. After an intact test run, selected ligaments were cut in random sequence and the test repeated. The remaining ligaments were tested to failure with servohydrolic stress at 5 mm/second. In the intact joint complex, the average dorsopalmar rotational displacement was approximately 9° in each direction. Under the load limit, the dorsopalmar translational displacement averaged 0.9 mm and 0.5 mm respectively, proximal–distal translational displacement averaged 0.8 mm and 0.4 mm respectively, and distractional displacement averaged 0.3 mm. Based on the sequential sectioning it was found that the dorsal ligament provided 76% (SD 14) of the rotational resistance with palmar rotation of the capitate and 44% (SD 19) of translational constraint with palmar translation of the capitate. The deep ligament provided 51% (SD 15) of the rotational resistance with dorsal rotation of the capitate and 63% (SD 24) of translational resistance with dorsal translation of the capitate. With proximal—distal translation, the dorsal ligament was the most important constraint in each direction. In resisting distraction, each of the three ligaments was equally effective. Failure testing showed the deep ligament was strongest at 289 N, followed by the palmar at 171 N and the dorsal at 133 N.

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