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Single Degree‐of‐Freedom Damped Vibration
Published in Haym Benaroya, Mark Nagurka, Seon Han, Mechanical Vibration, 2017
Haym Benaroya, Mark Nagurka, Seon Han
Dynamic balance introduces a second plane for weights, which addresses “side‐to‐side” imbalance, or lateral “wobble” imbalance. This method involves spinning the wheel on a horizontal shaft. The dynamic balancing machine identifies the weights required on both the outboard and inboard rim fianges to cancel both vertical and horizontal imbalances. This method is sometimes advertised as “computer spin‐balancing.” Again, almost any object can be balanced this way, whether round or not.
Theoretical model for the motion of a ring spinning traveler
Published in The Journal of The Textile Institute, 2021
Xinrong Li, Hanbang Liu, Pengfei Lv, Lidong Liu
Ring spinning is likely to be the dominant technique in China’s spinning industry for a long time to come. With the growth to maturity of high-speed spinning spindle technology, ring spinning is now developing in the direction of high speed, large volume, and high production capacity. The most important factors restricting the development of high-speed ring spinning involve the ring and traveler system. The motion of the traveler has a significant impact on the spinning quality of a ring spinning frame, on the yarn breakage rate, and on the design and use of the traveler. Therefore, it is important to analyze the motion of the traveler during the spinning process. To do this, it is necessary to carry out a force analysis on the traveler and establish its dynamic balance equation. The yarn tension of the balloon segment (Chang et al., 2018) will change with its shape, which directly affects the force on the traveler. Therefore, to determine the state of motion of the traveler, it is essential to take account of the behavior of the balloon (Fraser et al., 1995).
Socioeconomic and gender-based disparities in the motor competence of school-age children
Published in Journal of Sports Sciences, 2021
Véronique Gosselin, Mario Leone, Suzanne Laberge
This study examined socioeconomic and gender-based disparities in agility, balance and coordination amongst Quebec children (6–12-year-olds) using product-oriented tests. Overall, boys were more likely than girls to demonstrate low MC for hand-foot coordination while girls showed lower levels of proficiency for agility and skills involving object-control. Children in low SES schools were more likely than children in high SES schools to demonstrate low levels of MC in agility, balance and coordination. The largest gap was observed for dynamic balance. Children in middle SES schools showed higher odds of low MC compared to children in high SES schools for agility and coordination. The use of Newell’s model of constraints (Newell, 1986) and Bourdieu’s concept of habitus (Bourdieu, 1978; 1984) were useful to consider potential explanations of the profound causes of these disparities. To level up inequalities in MC, resources invested in school-level PA programmes could be proportionate to the school SES and physical education classes should include varied developmentally appropriate activities targeting, from school entry, students’ acquisition of all motor skills. Additionally, future research could benefit from using theoretical or sociological frameworks to better understand MC disparities and inform the development of efficient school-based interventions.
Zumba dancing and aerobic exercise can improve working memory, motor function, and depressive symptoms in female patients with Fibromyalgia
Published in European Journal of Sport Science, 2020
Ebrahim Norouzi, FatemehSadat Hosseini, Mohammad Vaezmosavi, Markus Gerber, Uwe Pühse, Serge Brand
Given the above, the purpose of the present study was to compare the effects of 12 weeks of Zumba dancing and of conventional aerobic exercise training with a control condition on working memory, motor function and depression symptom severity among middle-aged women diagnosed with FM. The following three hypotheses were tested. Based on previous research (Baptista et al., 2012; Bidonde et al., 2017; Giannotti et al., 2014; Júnior et al., 2017), we expected that in female individuals with FM and compared to a control condition, Zumba dancing and aerobic exercise training would lead to (a) an increase in working memory, (b) an improvement of dynamic balance, (c) a reduction of symptoms of depression. As Zumba dancing has not yet been compared with more traditional exercise protocols, we made no prediction as to which of the two treatment interventions would lead to more favourable outcomes. However, in line with the findings reported by Giannotti et al. (2014) and others (Sosa et al., 2017), we anticipated that aerobic exercise training would also have positive effects on participants’ working memory, motor, and psychological functioning.