一种等宽凸轮-连杆机构的解析设计

研究了一种等宽凸轮-连杆组合机构(即作平面复杂运动平底从动件的形锁合式等宽凸轮机构)的设计问题。给出了同向、异向等宽凸轮-连杆机构的基本参数之间的关系,并应用支撑函数法和反转法推导了等宽凸轮廓线的曲率半径、外凸性判据、参数方程、周长及凸轮面积的通用计算公式。根据凸轮基圆半径r0与凸轮宽度W的确定量化关系,得到了确定最小基圆半径{r0}min与宽度W的方法。用该解析法可以设计出廓线外凸且尺寸最小的等宽凸轮,毋需再验证其廓线的凹凸性。     

Decision-Making Groups Attenuate the Discussion Bias in Favor of Shared Information: A Meta-Analysis

Groups often focus their discussions on information that all members know at the outset. To test how robust the sampling advantage for shared information is, a meta-analysis was conducted. The analysis integrated findings from 20 publications (45 independent effects), in which information sharedness was manipulated. Groups discussed more shared than unshared information overall. However, the observed sampling advantage was smaller than expected. Groups attenuated the discussion bias in particular when they had to choose among a small number of decision alternatives and when they had less than 30 minutes discussion time. Moreover, groups performing a hidden-profile task tended to display a smaller discussion bias than groups performing tasks with equally attractive alternatives.