نتایج جستجو برای: fatigue modeling
تعداد نتایج: 458120 فیلتر نتایج به سال:
because of inhomogeneity and anisotropy of composite materials, defining a unique fatigue criterion to be suitable for different loading conditions is much more difficult in comparison with traditional materials. for this reason many tests on evaluating the damages such as crack density, stiffness reduction and residual strength are used by various researchers to monitor the fatigue process. in...
Submit Manuscript | http://medcraveonline.com Abbreviations: FFR: Fatigue Failure Rate; FFPN: Fleet of N Fatigue-Prone aircraft; AL: Airline; AC: Aircraft; SL: Safe Life; FS: Fail Safe; DT: Damage Tolerance; MIMAR: Modeling in Industrial Maintenance and Reliability; CDF: Cumulative Distribution Functions; RV: Random Variable; ML: Maximum Likelihood; MCh: Markov chain; CD: Crack Detection; FF: F...
The objective of the current study was twofold: (a) to determine whether subgroups of breast cancer patients could be identified on the basis of their distinct trajectory or pattern of fatigue following treatment for early stage cancer using growth mixture modeling and (b) to examine whether the subgroups could be distinguished on the basis of a cognitive-behavioral model. Growth mixture modeli...
BACKGROUND Fatigue is a common and frequently observed complaint among older adults. However, knowledge about the nature and correlates of fatigue in old age is very limited. OBJECTIVE This study examined the relationship of functional indicators, psychological and situational factors and fatigue for 210 octogenarians and centenarians from the Georgia Centenarian Study. METHODS Three indica...
Since appearance of fatigue is a reality in rehabilitation sessions, developing a muscle model that is able to cope with this effect in dynamic contractions is a must. In this paper we attempt to model the effect of fatigue in a Hill type muscle model with weighting sum of joint torques. The promising results will contribute to achieving a generalized model that is able to mold to different mov...
The effects of fatigue on cognitive processing are not fully understood. Computational modeling research has led to two distinct accounts of fatigue, and specifically its effects on psychomotor vigilance performance, which are both supported by empirical findings. The first account is based on ACT-R and posits that fatigue increases the probability of microlapses. A biomathmatical model of fati...
many procedures suggest for reduction of responses of riser to vortex induced vibrations (viv). natural frequencies of marine risers is an important parameter that can affect the responses of riser to viv. change of riser properties such as top tension and bending stiffness can alter natural frequencies. in this study effects of riser specifications on the responses and fatigue damage of marine...
OBJECTIVES This study (1) examines fatigue over 1 year in adolescents with chronic pain (n = 61) and depressive disorders (n = 51) compared with healthy adolescents (n = 60), (2) identifies longitudinal risk factors, and (3) tests sleep disturbances as a mediator between depression and fatigue. METHODS Adolescents completed questionnaires at baseline, 6, and 12 months. Mixed effects models ex...
Introduction: Psychosocial factors and fatigue are significant factors in nurses’ performance. Since the relationship between psychosocial factors and fatigue has been rarely studied, the aim of this study was investigating the relationship between psychosocial work factors and fatigue among nurses. Method: In this cross-sectional study, 270 nurses from hospitals of Urmia University of Medical...
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