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Journal articles on the topic 'STIFFNESS BALANCE'

Author: Grafiati

Published: 11 September 2023

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1

Winter, David A., Aftab Patla, and Francois Prince. "Stiffness control of balance during quiet standing." Gait & Posture 5, no. 2 (1997): 154–55. http://dx.doi.org/10.1016/s0966-6362(97)83378-4.

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2

Winter, David A., Aftab E. Patla, Francois Prince, Milad Ishac, and Krystyna Gielo-Perczak. "Stiffness Control of Balance in Quiet Standing." Journal of Neurophysiology 80, no. 3 (1998): 1211–21. http://dx.doi.org/10.1152/jn.1998.80.3.1211.

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Winter, David A., Aftab E. Patla, Francois Prince, Milad Ishac, and Krystyna Gielo-Perczak. Stiffness control of balance in quiet standing. J. Neurophysiol. 80: 1211–1221, 1998. Our goal was to provide some insights into how the CNS controls and maintains an upright standing posture, which is an integral part of activities of daily living. Although researchers have used simple performance measures of maintenance of this posture quite effectively in clinical decision making, the mechanisms and control principles involved have not been clear. We propose a relatively simple control scheme for reg

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3

Bakshi, Avijit, Paul DiZio, and James R. Lackner. "Multiple roles of active stiffness in upright balance and multidirectional sway." Journal of Neurophysiology 124, no. 6 (2020): 1995–2011. http://dx.doi.org/10.1152/jn.00612.2019.

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Our previously published engaged leg model shows how stiffness plays complex multicausal roles in balance. In one role, it is crucial to stability, with task contingent influences over balance. In another, it overcomes viscous drag. Task-dependent stiffness alone does not explain stable balance; geometrical, invariant aspects of body biomechanics also matter. Our model is fully applicable to clinical balance pathologies involving asymmetries in movement and balance control.

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Winter, David A., Aftab E. Patla, Shirley Rietdyk, and Milad G. Ishac. "Ankle Muscle Stiffness in the Control of Balance During Quiet Standing." Journal of Neurophysiology 85, no. 6 (2001): 2630–33. http://dx.doi.org/10.1152/jn.2001.85.6.2630.

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This research presents new data and reanalyzed information to refute the criticisms of our model of stiffness control during quiet standing. A re-review of their references to biomechanical research on muscle ankle stiffness confirmed muscle stiffness estimates of the ankle series elastic elements that agreed closely with our estimates. A new technique is presented that directly estimates the muscle stiffness from the ankle moment (N · m) and sway angle (deg). The linear regression of 10 subjects standing quietly for 10 s estimated the stiffness (N · m/deg) to be safely above the gravitational

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Hua, Gao, Shuai Changgeng, and Xu Guomin. "Study on Mechanical Model of Balance and Stiffness Characteristics of Fiber Reinforced Bellows Type Rubber Hose." Science of Advanced Materials 12, no. 7 (2020): 981–93. http://dx.doi.org/10.1166/sam.2020.3735.

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The mechanical model related to the balance and stiffness characteristics of the bellows type rubber hose under internal pressure was studied. Based on the thin shell theory without considering bending moments and shear force, the equilibrium equation of the bellows type hose was established to obtain the mechanical equilibrium angle under different mechanical environments. Considering the deformation characteristics of the rope structure and the mechanical equilibrium angle of the hose, the deformation of the bellows type rubber hose was divided into two stages, including winding angle deflec

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Morasso, Pietro G., and Vittorio Sanguineti. "Ankle Muscle Stiffness Alone Cannot Stabilize Balance During Quiet Standing." Journal of Neurophysiology 88, no. 4 (2002): 2157–62. http://dx.doi.org/10.1152/jn.2002.88.4.2157.

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This communication addresses again the hypothesis that the stabilization of balance during quiet standing is achieved by the stiffness of ankle muscles without anticipatory active control. It is shown that a recently proposed method of estimating ankle stiffness directly from the analysis of the posturographic data is incorrect because it ignores the modulation of motoneuronal activity and grossly overestimates the real range of values in relation with the critical value of stiffness. Moreover, a new simulation study with a realistic model of ankle muscles demonstrates the mechanical instabili

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McIlvain, Grace, James B. Tracy, Charlotte A. Chaze, et al. "Brain Stiffness Relates to Dynamic Balance Reactions in Children With Cerebral Palsy." Journal of Child Neurology 35, no. 7 (2020): 463–71. http://dx.doi.org/10.1177/0883073820909274.

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Cerebral palsy is a neurodevelopmental movement disorder that affects coordination and balance. Therapeutic treatments for balance deficiencies in this population primarily focus on the musculoskeletal system, whereas the neural basis of balance impairment is often overlooked. Magnetic resonance elastography (MRE) is an emerging technique that has the ability to sensitively assess microstructural brain health through in vivo measurements of neural tissue stiffness. Using magnetic resonance elastography, we have previously measured significantly softer grey matter in children with cerebral pals

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Louessard, Aude, Xavier Bonnet, Anita Catapano, and Helene Pillet. "Quantification of the Influence of Prosthetic Ankle Stiffness on Static Balance Using Lower Limb Prosthetic Simulators." Prosthesis 4, no. 4 (2022): 636–47. http://dx.doi.org/10.3390/prosthesis4040051.

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After a transtibial amputation, the prosthetic foot aims at replacing the missing ankle joint. Due to alteration of proprioception and mobility, the static balance of amputees is challenging. The stiffness of most of the usual prosthetic feet cannot adapt according to the situation. Thus, the control of the user’s balance is closely related to the ankle stiffness value. The aim of this study is to evaluate both the impact of the ankle stiffness and the visual system on static balance. In order to avoid bias relative to different levels of residual proprioception among individuals, the study ha

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Wang, Pingjun, Gangyan Li, and Xueping Li. "Vibration Characteristics Analysis of O-Shaped Damping Ring to Balance Damping Gear Transmission System for Three-Cylinder Engine." Processes 10, no. 9 (2022): 1685. http://dx.doi.org/10.3390/pr10091685.

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Balance shafts are often used to improve the engine vibration characteristics of three-cylinder engines. The balance damping gear with a damping ring is an important part connecting the crankshaft and the balance shaft transmission. The stiffness characteristics of the damping ring and the unbalance of the gear have an important influence on its vibration suppression performance, but the coupled influence of the stiffness characteristics of the damping ring and the unbalanced characteristics of the vibration damping gear is unknown. In this paper, a multi-body dynamic bending–torsional couplin

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10

Kal, Elmar, Han Houdijk, John van der Kamp, et al. "Are the effects of internal focus instructions different from external focus instructions given during balance training in stroke patients? A double-blind randomized controlled trial." Clinical Rehabilitation 33, no. 2 (2018): 207–21. http://dx.doi.org/10.1177/0269215518795243.

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Objective: This study aimed to assess if external focus instructions result in greater improvements in motor skill and automaticity compared to internal focus instructions in stroke patients. Design: Double-blind randomized controlled trial. Setting: Inpatient stroke rehabilitation unit. Subjects: A total of 63 stroke patients (Meanage = 59.6 ± 10.7 years; Meandays since stroke = 28.5 ± 16.6; MedianFunctional Ambulation Categories = 4). Interventions: Patients were randomly assigned to an internal ( N = 31) or external ( N = 32) focus instruction group. Both groups practiced a balance board st

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11

Azaman, Aizreena, and Shin Ichiroh Yamamoto. "Ankle Joint Stiffness and Damping Pattern under Different Frequency of Translation Perturbation." Applied Mechanics and Materials 393 (September 2013): 703–8. http://dx.doi.org/10.4028/www.scientific.net/amm.393.703.

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The change of effective stiffness and damping characteristic of ankle joint are able to indicate degeneration of balance ability due to ageing effect. This paper will discuss the ankle joint stiffness and damping pattern along repeated translation perturbation. Six young healthy subjects were exposed to five trials of five different frequencies of perturbation (quiet standing, 0.2 Hz, 0.4 Hz, 0.6 Hz and 0.8 Hz). The result showed that the mean of effective stiffness was reduced with the increase of frequency applied; meanwhile the mean of damping value increased with increasing frequency. Addi

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Shahid, Shafuq, Zeest Hashmi, Hira Rehman, Saima Riaz, Muhammad Sulman, and Rehan Ramzan Khan. "Association of Hand Stiffness with Balance Impairment in Chronic Stroke Patients." Pakistan Journal of Medical and Health Sciences 16, no. 4 (2022): 612–13. http://dx.doi.org/10.53350/pjmhs22164612.

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Objective: To determine the association of hand stiffness with balance impairment in chronic stroke patients. Methodology: A cross sectional study was conducted on eighteen chronic stroke patients with age range between 40 to 70 years. Patients were taken from Riphah Rehab Center and Govt. Kot Khawaja Saeed Teaching Hospital KEMU Lahore. The balance of patients was assessed by using Berg Balance Scale (BBS) and Timed Up and Go Test (TUG) while motor function of the hand was assessed by using Fugl Meyer Assessment-Upper Extremity (FMA-UE). Results: The analysis of data done by using SPSS versio

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13

Lau, S. L., and W. S. Zhang. "Nonlinear Vibrations of Piecewise-Linear Systems by Incremental Harmonic Balance Method." Journal of Applied Mechanics 59, no. 1 (1992): 153–60. http://dx.doi.org/10.1115/1.2899421.

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The incremental harmonic balance (IHB) method is extended to analyze the periodic vibrations of systems with a general form of piecewise-linear stiffness characteristics. An explicit formulation has been worked out. This development is of significance as many structural and mechanical systems of practical interest possess a piecewise-linear stiffness. Typical examples show that the IHB method is very effective for analyzing this kind of systems under steady-state vibrations.

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Liu, Qiang, Kedong Zhou, Chao Shen, and Lei He. "Effect of an Internal Impact Balance Mechanism on the Perceptible Recoil of Machine Gun." E3S Web of Conferences 231 (2021): 03001. http://dx.doi.org/10.1051/e3sconf/202123103001.

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In order to reasonably reduce the perceptible recoil of firearms, and design a recoil reduction device that can be commonly used in automatic rifles, semi-automatic rifles, and machine guns, a balancing mechanism for recoil reduction technology was proposed in this paper. With the perceptible recoil generated by the impact from automat to the balance mechanism as the objective function, the parametric analysis of the mass of the balance weight and the spring stiffness of the balance mechanism was conducted. The analysis showed that the influence of the mass of the balance weight on the reducti

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15

Liu, Heng, Jie Hong, Shilun Ruan, Zheng Li, and Gengdong Cheng. "A Model accounting for Stiffness Weakening of Curvic Couplings under Various Loading Conditions." Mathematical Problems in Engineering 2020 (February 11, 2020): 1–17. http://dx.doi.org/10.1155/2020/1042375.

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Curvic couplings are frequently used in aeroengine rotors. The stiffness of the curvic couplings is of guiding significance to the engineering design of aeroengine rotors as it is significantly different from that of continuous structures. In this paper, definitions and relations of the structure parameters for a curvic coupling are firstly introduced. Based on this proposed mechanical framework, a novel mechanical model accounting for the stiffness weakening under shearing, compression, bending, and torsion is developed for curvic couplings. In this model, a three-spring system, which consist

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16

Jo, Sun-Ha, Hyuk-Jae Choi, Hyeon-Seok Cho, Jin-Hwan Yoon, and Won-Young Lee. "Effect of Core Balance Training on Muscle Tone and Balance Ability in Adult Men and Women." International Journal of Environmental Research and Public Health 19, no. 19 (2022): 12190. http://dx.doi.org/10.3390/ijerph191912190.

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(1) Background: The amount of physical activity most adults perform is less than the recommended amount, and the resulting decrease in physical strength makes them vulnerable to various diseases. A decrease in muscle size and strength due to damage caused by disease or aging negatively affects functional strength. Muscle evaluation in adults can yield results that are predictive indicators of aging and unexpected disability. In addition, balance ability is essential to prevent falls and injuries in daily life and maintain functional activities. It is important to develop and strengthen balance

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17

Box, Finn, Doireann O’Kiely, Ousmane Kodio, Maxime Inizan, Alfonso A. Castrejón-Pita, and Dominic Vella. "Dynamics of wrinkling in ultrathin elastic sheets." Proceedings of the National Academy of Sciences 116, no. 42 (2019): 20875–80. http://dx.doi.org/10.1073/pnas.1905755116.

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The wrinkling of thin elastic objects provides a means of generating regular patterning at small scales in applications ranging from photovoltaics to microfluidic devices. Static wrinkle patterns are known to be governed by an energetic balance between the object’s bending stiffness and an effective substrate stiffness, which may originate from a true substrate stiffness or from tension and curvature along the wrinkles. Here, we investigate dynamic wrinkling induced by the impact of a solid sphere onto an ultrathin polymer sheet floating on water. The vertical deflection of the sheet’s center

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18

Gong, Fei, Rupeng Zhu, and Qibo Wang. "Dynamics Modeling and Load-Sharing Performance Optimization of Concentric Face Gear Split-Torque Transmission Systems." Applied Sciences 13, no. 7 (2023): 4352. http://dx.doi.org/10.3390/app13074352.

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The concentric face gear split-torque transmission system (CFGSTTS) has the advantages of a large reduction ratio and high power density. The CFGSTTS has considerable potential to be applied in helicopter main reducers. As such, in this study, we analyzed the load distribution characteristics of a dual input–dual output concentric face gear split-torque transmission system. A load-dependent time-varying meshing stiffness surrogate model was designed based on a feedforward neural network. The difference in the meshing stiffness between the pinion driving and face gear driving was analyzed. The

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19

Kashani, H., and A. S. Nobari. "Structural Nonlinearity Identification Using Perturbed Eigen Problem and ITD Modal Analysis Method." Applied Mechanics and Materials 232 (November 2012): 949–54. http://dx.doi.org/10.4028/www.scientific.net/amm.232.949.

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Identification of nonlinear behavior in structural dynamics has been considered here, in this paper. Time domain output data of system are directly used to identify system through Ibrahim Time Domain (ITD) modal analysis method and perturbed eigen problem. Cubic stiffness and Jenkins element, as case studies, are employed to qualify the identification method. Results are compared with Harmonic Balance (HB) estimation of nonlinear dynamic stiffness. Results of ITD based identification are in good agreement with the HB estimation, for stiffness parts of nonlinear dynamic stiffness but for dampin

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20

Xu, Bin, Shien Yu, and Jianzhong Zhang. "Design Method of Three-Component Optic Fiber Balance Based on Fabry–Perot Displacement Sensor." Sensors 23, no. 17 (2023): 7492. http://dx.doi.org/10.3390/s23177492.

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This article proposes a new type of three-component optic fiber balance based on Fabry–Perot displacement measurement technology based on the structure of the pulse wind tunnel balance. This paper systematically introduces the force measurement principle and design process of a three-component optic fiber balance and conducts relevant simulation analysis and experimental verification. The simulation results show that the Fabry–Perot sensor can achieve significant sensitivity to cavity length changes, and when used in existing balance structures, sensitivity gains can be achieved by changing th

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21

Guo, Wei, Shiyin Qiu, Fusheng Zha, Jing Deng, Xin Wang, and Fei Chen. "A novel active balance assistive control strategy based on virtual stiffness model of XCoM." Assembly Automation 40, no. 1 (2019): 132–42. http://dx.doi.org/10.1108/aa-10-2018-0159.

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PurposeThis paper aims to propose a novel balance-assistive control strategy for hip exoskeleton robot.Design/methodology/approachA hierarchical balance assistive controller based on the virtual stiffness model of extrapolated center of mass (XCoM) is proposed and tested by exoskeleton balance assistive control experiments.FindingsExperiment results show that the proposed controller can accelerate the swing foot chasing XCoM and enlarge the margin of stability.Originality/valueAs a proof of concept, this paper shows the potential for exoskeleton to actively assist human regain balance in sagit

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22

Engelhart, D., J. H. Pasma, A. C. Schouten, et al. "Adaptation of multijoint coordination during standing balance in healthy young and healthy old individuals." Journal of Neurophysiology 115, no. 3 (2016): 1422–35. http://dx.doi.org/10.1152/jn.00030.2015.

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Standing balance requires multijoint coordination between the ankles and hips. We investigated how humans adapt their multijoint coordination to adjust to various conditions and whether the adaptation differed between healthy young participants and healthy elderly. Balance was disturbed by push/pull rods, applying two continuous and independent force disturbances at the level of the hip and between the shoulder blades. In addition, external force fields were applied, represented by an external stiffness at the hip, either stabilizing or destabilizing the participants' balance. Multivariate clo

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Pasma, J. H., D. Engelhart, A. B. Maier, A. C. Schouten, H. van der Kooij, and C. G. M. Meskers. "Changes in sensory reweighting of proprioceptive information during standing balance with age and disease." Journal of Neurophysiology 114, no. 6 (2015): 3220–33. http://dx.doi.org/10.1152/jn.00414.2015.

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With sensory reweighting, reliable sensory information is selected over unreliable information during balance by dynamically combining this information. We used system identification techniques to show the weight and the adaptive process of weight change of proprioceptive information during standing balance with age and specific diseases. Ten healthy young subjects (aged between 20 and 30 yr) and 44 elderly subjects (aged above 65 yr) encompassing 10 healthy elderly, 10 with cataract, 10 with polyneuropathy, and 14 with impaired balance, participated in the study. During stance, proprioceptive

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Hirano, Atsushi. "Study on Wheel Stiffness Considering Balance between Driving Stability and Weight." SAE International Journal of Commercial Vehicles 8, no. 1 (2015): 205–12. http://dx.doi.org/10.4271/2015-01-1755.

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25

Bak, Christian, Nicholas Gaudern, Frederik Zahle, and Tomas Vronsky. "Airfoil design: Finding the balance between design lift and structural stiffness." Journal of Physics: Conference Series 524 (June 16, 2014): 012017. http://dx.doi.org/10.1088/1742-6596/524/1/012017.

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26

Le Mouel, Charlotte, and Romain Brette. "Anticipatory coadaptation of ankle stiffness and sensorimotor gain for standing balance." PLOS Computational Biology 15, no. 11 (2019): e1007463. http://dx.doi.org/10.1371/journal.pcbi.1007463.

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27

Kang, Hyun Gu, and Lewis A. Lipsitz. "Stiffness Control of Balance During Quiet Standing and Dual Task in Older Adults: The MOBILIZE Boston Study." Journal of Neurophysiology 104, no. 6 (2010): 3510–17. http://dx.doi.org/10.1152/jn.00820.2009.

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Distractions affect postural control, but this mechanism is not well understood. Diversion of resources during cognitive stress may lead to decreased motor drive and postural muscle tone. This may appear as decreased postural stiffness and increased postural sway amplitude. We hypothesized that dual tasking leads to decreased stiffness and increased sway amplitude. Postural sway (center of pressure; COP) data were used from 724 participants aged 77.9 ± 5.3 yr, a representative sample of community-dwelling older adults, the MOBILIZE Boston Study cohort. Subjects stood barefoot with eyes open fo

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Yan, Peng, Shaoran Kang та Lebo Ma. "The Influence of Glass Fiber/Glass Fiber Powder with β-Nucleating Agent on the Properties of Polypropylene". International Journal of Polymer Science 2023 (27 березня 2023): 1–16. http://dx.doi.org/10.1155/2023/1240792.

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Glass fiber-reinforced polypropylene (PP/GF) has been widely used due to its high stiffness, but for some applications that need low-module characteristics, PP/GF will have limitations due to its lower toughness, so it is necessary to develop glass fiber-modified polypropylene with good stiffness–toughness balance performance. In this study, two average length glass fibers (4.5 mm and 12 mm) and glass fiber powder, combined with β-nucleating agent, were used to investigate the effects on the crystallization and mechanical properties of polypropylene. The results show that compared with glass f

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29

Qiao, Jinwei, and Na Liu. "Numerical Simulation of Bending Stiffness Analysis for Spring Linkage Applied to In-Pipe Robot." Mathematical Problems in Engineering 2020 (August 27, 2020): 1–11. http://dx.doi.org/10.1155/2020/6701696.

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Spring linkage can be applied to in-pipe robots for connecting different modules together and can make it pass through elbows more easily. However, its stiffness cannot be set to be too hard or too soft. This paper tries to make a balance between the compressive stiffness and the bending stiffness of the spring. After a brief introduction to the construction mechanism and some assumptions, the mathematical representation of the spring bending stiffness was deduced based on the Kirchhoff theory which describes the spatial curve with displacement rather than time. Then, some simulations aiming a

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Zhang, Yuanyuan, Huaiju Liu, Caichao Zhu, Chaosheng Song, and Zufeng Li. "Influence of lubrication starvation and surface waviness on the oil film stiffness of elastohydrodynamic lubrication line contact." Journal of Vibration and Control 24, no. 5 (2016): 924–36. http://dx.doi.org/10.1177/1077546316655024.

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Stiffness properties of interfacial engineering surfaces are of great importance to the dynamic performance of relevant mechanical systems. Normal contact stiffness and oil film stiffness of line contact problems are studied in this work analytically and numerically. The Hertzian contact theory and the Yang–Sun method are applied to predict the contact stiffness, while the empirical elastohydrodynamic lubrication (EHL) film thickness method and the complete numerical EHL model are used to predict the oil film stiffness. The numerical model mainly consists of the Reynolds equation; the film thi

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31

Jiang, Bing. "DO WE NEED VERY STIFF FILLERS?" Rubber Chemistry and Technology 90, no. 4 (2017): 743–50. http://dx.doi.org/10.5254/rct.18.82673.

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ABSTRACT The influence of reinforcing fillers on the stretching of a rubber matrix is analyzed. It is shown that a filler stiffness higher than a critical stiffness does not further enhance the stiffness of the reinforced elastomer. The stiffer filler induces a higher stress–strain concentration and causes filler–rubber dissociation or chain scission at a lower macroscopic strain. Reducing filler stiffness can reduce the stress–strain concentration and therefore delay rubber chain scission or dissociation from the filler surface. Accordingly, the toughness of the reinforced elastomer could be

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Guo, Yang, Shulin Sun, and Huixuan Zhang. "Modification of the core–shell ratio to prepare PB-g-(MMA-co-St-co-GMA) particle-toughened poly(butylene terephthalate) and polycarbonate blends with balanced stiffness and toughness." RSC Adv. 4, no. 102 (2014): 58880–87. http://dx.doi.org/10.1039/c4ra08646e.

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Li, Chang He, Wei Ping Mao, and Yu Cheng Ding. "Numerical Investigation into Spindle System Stiffness of High-Speed Grinder." Key Engineering Materials 487 (July 2011): 490–94. http://dx.doi.org/10.4028/www.scientific.net/kem.487.490.

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This study was focused on the theoretical modeling and numerical investigation about the dynamic and static stiffness of spindle system of high speed grinder. The moment balance and the transition matrix, the state vector, field matrix of spindle system of high speed grinder were analyzed and deduced. The theoretical models about dynamic and static stiffness were established using the transfer matrix method. The numerical results showed that increas of the preload could result in the improvement of static stiffness of spindle end within the range of its working speed; the reduction of front ov

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Khan, Fayaz, Mohamed Faisal Chevidikunnan, Raghad Ahmad Almalki, et al. "Stiff-Person Syndrome Outpatient Rehabilitation: Case Report." Journal of Neurosciences in Rural Practice 11, no. 04 (2020): 651–53. http://dx.doi.org/10.1055/s-0040-1715081.

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AbstractStiff-person syndrome (SPS) is a rare neurological disorder that causes muscle rigidity and stiffness of the trunk and proximal limb muscles, leading to movement difficulties and impaired function. Due to the rarity of the disease, studies on the benefit of rehabilitation for this disorder are quite limited. A 46-year-old female patient diagnosed with SPS complained of imbalance and movement difficulty. We prescribed therapeutic exercises aimed to reduce the stiffness of the trunk and proximal limbs and improve her function. Baseline measurement of the patient's range of motion, muscle

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Wang, Shuo, Meng Cao, Hongqian Xue, et al. "Nano-silica reinforced epoxy resin/nano-rubber composite material with a balance of stiffness and toughness." High Performance Polymers 33, no. 6 (2021): 685–94. http://dx.doi.org/10.1177/0954008320988752.

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In the electronics and aerospace industries, epoxy resins are generally regarded as economical and efficient adhesives and have a high status. However, epoxy resins are highly crosslinked polymers and are very brittle adhesives where they are prone to fast crack propagation under dynamic loads. Therefore, it is very necessary to enhance the toughness of epoxy resin adhesives. Nano-rubber has been proved to be an important toughening agent for epoxy resin, which can significantly improve the fracture toughness of epoxy resin. However, increasing the toughness of epoxy resin by adding nanomateri

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36

Liu, Gang, and Robert G. Parker. "Nonlinear, parametrically excited dynamics of two-stage spur gear trains with mesh stiffness fluctuation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 8 (2012): 1939–57. http://dx.doi.org/10.1177/0954406212447509.

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This work studies the nonlinear, parametrically excited dynamics of two spur gear pairs in a two-stage counter-shaft configuration. The dynamic model includes parametric excitations and contact loss of both tooth meshes with two different mesh frequencies. The time-varying mesh stiffnesses and nonlinear tooth separation functions are reformulated into forms suitable for perturbation analysis. The periodic steady-state solutions are obtained by the method of multiple scales and compared against a semi-analytical harmonic balance method as well as numerical integration for fundamental and subhar

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Dhanda, Mohit, and Arpan Gupta. "Investigation of Jump Resonance of a Horizontal Axis Washing Machine for Nonlinear Vibration using the Harmonic Balance Method." IOP Conference Series: Materials Science and Engineering 1225, no. 1 (2022): 012040. http://dx.doi.org/10.1088/1757-899x/1225/1/012040.

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Abstract In this work, a drum-type horizontal axis washing machine with two springs and two dampers has been considered to study the jump resonance phenomenon. Here two springs and two dampers are used and effects of nonlinear spring stiffness on vibration level in both horizontal and vertical directions have been investigated. In this study, a mathematical model of a horizontal axis washing machine is formed. A separate analysis is carried out in both vertical and horizontal directions by considering the whole system as a two degree of freedom system. As vibration magnitude is large due to un

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Reeves, N. Peter, Vanessa Q. Everding, Jacek Cholewicki, and David C. Morrisette. "The effects of trunk stiffness on postural control during unstable seated balance." Experimental Brain Research 174, no. 4 (2006): 694–700. http://dx.doi.org/10.1007/s00221-006-0516-5.

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Chen, Yuan, Mingwang Pan, Yue Li, et al. "Core-shell nanoparticles toughened polylactide with excellent transparency and stiffness-toughness balance." Composites Science and Technology 164 (August 2018): 168–77. http://dx.doi.org/10.1016/j.compscitech.2018.04.037.

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40

Li, Eric, and Z. C. He. "Optimal balance between mass and smoothed stiffness in simulation of acoustic problems." Applied Mathematical Modelling 75 (November 2019): 1–22. http://dx.doi.org/10.1016/j.apm.2019.05.019.

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Liu, Hai Tao, Zhi Yu Wen, Zheng Guo Shang, and Li Chen. "A New Method to Analyze the Stiffness of MEMS Accelerometer." Key Engineering Materials 609-610 (April 2014): 710–14. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.710.

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The finite element method to obtain the stiffness of MEMS (Micro-Electro-Mechanical Systems) accelerometer is difficult to give an exact expression, so a new method to analyze the stiffness of MEMS accelerometer was purposed. Both Mechanics and electricity analysis were used to calculate the stiffness of vacuum microelectronic accelerometer developed in our laboratory, and the control and detection circuits were design according to the result. Finally, the sensitivity, linearity and other performance were measured through the static gravitational field experiments; the least squares curve fitt

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Ramadurai, Sruthi, Michael Jacobson, Prakyath Kantharaju, Hyeongkeun Jeong, Heejin Jeong, and Myunghee Kim. "Evaluation of Lower Limb Exoskeleton for Improving Balance during Squatting Exercise using Center of Pressure Metrics." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 66, no. 1 (2022): 858–62. http://dx.doi.org/10.1177/1071181322661447.

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The foot center of pressure (COP) variability is an important indicator of balance, particularly relevant for rehabilitation and training using wearable lower limb exoskeletons. This study aimed to evaluate the effectiveness of our exoskeleton in assisting squatting motion using the COP variability as a metric. Six human subjects performed alternate squatting and standing movements while their foot pressure and COP trajectories were recorded using insole pressure sensors. The exercises were performed under three conditions: i) no device, ii) unpowered device, and iii) device with optimal stiff

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Boonstra, T. A., A. C. Schouten, J. P. P. van Vugt, B. R. Bloem, and H. van der Kooij. "Parkinson's disease patients compensate for balance control asymmetry." Journal of Neurophysiology 112, no. 12 (2014): 3227–39. http://dx.doi.org/10.1152/jn.00813.2013.

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In Parkinson's disease (PD) subtle balance abnormalities can already be detected in early-stage patients. One feature of impaired balance control in PD is asymmetry: one leg produces more corrective joint torque than the other. We hypothesize that in mild to moderately affected PD patients, the least impaired leg compensates for the more impaired leg. Twenty PD patients and eleven healthy matched control subjects participated. Clinical asymmetry was determined by the difference between the left and right body side scores on the Unified Parkinson's Disease Rating Scale. Balance was perturbed wi

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Zhang, Qingshan, Robin Trama, Alexandre Fouré, and Christophe A. Hautier. "The Immediate Effects of Self‐Myofacial Release on Flexibility, Jump Performance and Dynamic Balance Ability." Journal of Human Kinetics 75, no. 1 (2020): 139–48. http://dx.doi.org/10.2478/hukin-2020-0043.

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Abstract Self-myofascial release (SMR) is a popular method to potentially increase the compliance and extensibility of the fascia and reduce muscle stiffness. The purpose of this study was to examine the acute effects of posterior muscle chain SMR on flexibility, vertical jump performance and balance ability. Eighteen young participants volunteered to take part in this crossover design study. They performed two self-massage sessions in randomized order separated by at least one week. One session consisted of posterior muscle chain SMR whereas the other one was performed on the upper limbs as a

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Muldoon, Jeanette, Sylvie Hampton, Sarah Gray, and Trish Cosham. "Compression hosiery for venous disorders and oedema: a question of balance." British Journal of Community Nursing 25, Sup9 (2020): S26—S32. http://dx.doi.org/10.12968/bjcn.2020.25.sup9.s26.

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Compression therapy for venous and lymphatic conditions may be delivered via a range of treatment modalities using many different technologies, depending on the patient's condition and needs. Clinical decision-making relies on accurate assessment of the patient, their presenting and underlying clinical condition, skill and training of the applier and the available resources. However, changes in the patient's condition or lifestyle may necessitate re-evaluation of the treatment pathway. Generally, compression bandages and Velcro wraps are used in the intensive acute phase of treatment, with sel

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Dong, Hao, Libang Wang, Haoqin Zhang, and Xiao-long Zhao. "Nonlinear Frequency Response Analysis of Double-helical Gear Pair Based on the Incremental Harmonic Balance Method." Shock and Vibration 2021 (April 15, 2021): 1–20. http://dx.doi.org/10.1155/2021/6687467.

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The torsional dynamic model of double-helical gear pair considering time-varying meshing stiffness, constant backlash, dynamic backlash, static transmission error, and external dynamic excitation was established. The frequency response characteristics of the system under constant and dynamic backlashes were solved by the incremental harmonic balance method, and the results were further verified by the numerical integration method. At the same time, the influence of time-varying meshing stiffness, damping, static transmission error, and external load excitation on the amplitude frequency charac

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Guo, Fuchen, Ke Li, Jiaxin Wu, Linli He, and Linxi Zhang. "Effects of Topological Constraints on Penetration Structures of Semi-Flexible Ring Polymers." Polymers 12, no. 11 (2020): 2659. http://dx.doi.org/10.3390/polym12112659.

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The effects of topological constraints on penetration structures of semi-flexible ring polymers in a melt are investigated using molecular dynamics simulations, considering simultaneously the effects of the chain stiffness. Three topology types of rings are considered: 01-knot (the unknotted), 31-knot and 61-knot ring polymers, respectively. With the improved algorithm to detect and quantify the inter-ring penetration (or inter-ring threading), the degree of ring threading does not increase monotonously with the chain stiffness, existing a peak value at the intermediate stiffness. It indicates

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Li, Ming, Wei Cheng, and Ruili Xie. "Design and experiments of a quasi–zero-stiffness isolator with a noncircular cam-based negative-stiffness mechanism." Journal of Vibration and Control 26, no. 21-22 (2020): 1935–47. http://dx.doi.org/10.1177/1077546320908689.

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This article presents a quasi–zero-stiffness isolator with a cam-based negative-stiffness mechanism, where the cam has a user-defined noncircular profile to generate negative stiffness to counterbalance the positive stiffness of the vertical spring and yield the quasi–zero-stiffness characteristic around the equilibrium position. Unlike previous studies, the proposed quasi–zero-stiffness isolator has the preferable feature that the desired cubic restoring force can be directly obtained through the well-designed profile of the cam in the negative-stiffness mechanism with the friction considered

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Liu, Zhenwei, Hongwei Bai, Yuanlin Luo, Qin Zhang, and Qiang Fu. "Achieving a low electrical percolation threshold and superior mechanical performance in poly(l-lactide)/thermoplastic polyurethane/carbon nanotubes composites via tailoring phase morphology with the aid of stereocomplex crystallites." RSC Advances 7, no. 18 (2017): 11076–84. http://dx.doi.org/10.1039/c6ra27401c.

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We demonstrate a facile strategy to fabricate highly conductive PLLA/TPU/CNTs composites with very low percolation threshold and good stiffness–toughness balance via constructing stereocomplex crystallites in PLLA melt to tailor phase morphology.

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Liu, Zuo Shi, and Yi Guo Wei. "Analysis and Simulation for Balance of Rigid Rotors Based on ADAMS." Advanced Materials Research 655-657 (January 2013): 412–15. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.412.

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Conventional models for mechanical rotors based on Automatic Dynamic Analysis of Mechanical Systems (ADAMS) are over-constraint. This paper proposes a new method for simulating the stiffness and damping of bearings using bushing and other kinematic pairs. Analysis and Simulation for balance of rigid rotors by ADAMS were performed. To reduce the imbalance inertial force, the balance weight of a take-up machine has been optimized. The results were verified by the prototype test. Our results suggest a more effective method for balance of mechanical rotors in the design stage.

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