Establishment of KRISS watt balance system to have high uniformity performance

Author(s):  
MyeongHyeon Kim ◽  
Dongmin Kim ◽  
Byung-Chill Woo ◽  
Dokyeong Ha ◽  
Sung-Uk Lee ◽  
...  
2020 ◽  
Vol 13 (9) ◽  
pp. 096502
Author(s):  
Yu Lu ◽  
Feng Zhou ◽  
Weizong Xu ◽  
Dongsheng Wang ◽  
Yuanyang Xia ◽  
...  

2019 ◽  
Vol 13 (1) ◽  
pp. 69-74
Author(s):  
Wang Yazhou ◽  
Xiao Junfeng ◽  
Liu Yongping ◽  
An Jianmin

Background: Various relevant patents and papers which have reported noncircular gears synthesize the advantages of circular gears and cam mechanisms, and are widely used in many types of mechanical instruments. Hobbing is a better method for fabricating noncircular gears. There are 4 linkagemethods to hob noncircular gears. However, which linkage method should be chosen practically has not yet been reported. Objective: The goal of this work is to choose the best linkage method for hobbing noncircular gears. Method: Firstly, the hobbing models of noncircular gears was deduced. Then, based on the model, hobbing linkage methods of noncircular gears were obtained. Thirdly, under different hobbing linkage methods, their aspects (developing regularity of hobbing cutter trace, arc length of program blocks and motion axes of machine tools) were compared. Results: Finally, with the best characteristics of a high density of shaping cutter trace, high uniformity of arc length of program blocks and ease of control, the equal arc-length of gear billet (EALGB) is obtained. It has been proven that EALGB is an excellent linkage method to hob noncircular gears. Conclusion: It has been proven that EALGB is an excellent linkage method to hob noncircular gears.


2014 ◽  
Vol 945-949 ◽  
pp. 777-780
Author(s):  
Tao Liu ◽  
Yong Xu ◽  
Bo Yuan Mao

Firstly, according to the structure characteristics of precision centrifuge, the mathematical model of its dynamic balancing system was set up, and the dynamic balancing scheme of double test surfaces, double emendation surfaces were established. Then the dynamic balance system controller of precision centrifuge was designed. Simulation results show that the controller designed can completely meet the requirements of precision centrifuge dynamic balance control system.


2021 ◽  
pp. 1-9
Author(s):  
Nour Zughbor ◽  
Aisha Alwahshi ◽  
Rahaf Abdelrahman ◽  
Zeina Elnekiti ◽  
Hoda Elkareish ◽  
...  

<b><i>Introduction:</i></b> Stroke is defined as the lack of blood supply to the brain, leading to rapid loss of brain function presenting with impairments such as muscle weakness, spasticity, lack of coordination, and proprioception loss. Both hydrotherapy and land-based therapy aim to target these aspects in the process of rehabilitation. The study aims to determine the effectiveness of water-based therapy on balance and gait of patients with stroke compared to land-based therapy. <b><i>Methods:</i></b> Data for this review were extracted from databases such as CINAHL, OTseeker, Ovid, PEDro, and PubMed (MEDLINE) and other sources such as Google Scholar. PRISMA guidelines were followed to exclude irrelevant studies. Only randomized controlled trials (RCTs) were included, and methodological quality was assessed using the PEDro scale. A meta-analysis of extracted data was conducted. <b><i>Results:</i></b> A total of 16 relevant RCTs were included for the review (<i>n</i> = 412 participants). All RCTs investigated the effect of water-based therapy compared to land-based therapy on balance and gait of patients with stroke. Meta-analysis of studies that used the Berg Balance Scale (BBS) as a primary outcome measure favored land-based therapy. Studies that used the Good Balance System (GBS) and the Biodex Balance System (BioBS) to measure the changes in anteroposterior sway and mediolateral sway favored water-based therapy. The overall pooled effect favored land-based therapy in improving gait parameters. <b><i>Conclusion:</i></b> Findings from meta-analysis support the effectiveness of land-based therapy in the improvement of balance and gait parameters of patients with stroke. However, the evidence for water-based therapy continues to be limited, and higher quality studies are required to determine the effectiveness of water-based therapy on patients with stroke, particularly on balance and gait.


Metrologia ◽  
2013 ◽  
Vol 50 (3) ◽  
pp. 235-242 ◽  
Author(s):  
H Baumann ◽  
A Eichenberger ◽  
F Cosandier ◽  
B Jeckelmann ◽  
R Clavel ◽  
...  
Keyword(s):  

Author(s):  
D. Kim ◽  
B.-C. Woo ◽  
D. Ha ◽  
S.-U. Lee ◽  
H.-S. Park ◽  
...  
Keyword(s):  

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