ASHRAE标准87.1-1983“螺旋桨风扇气动激励风扇振动和临界转速的动态特性测试方法”的用户报告了预测结果和测量结果之间的差异人们认为，这些差异与该标准在确定螺旋桨风扇临界转速时未考虑离心加劲的影响有关。为了确定这是否属实，ASHRAE启动了ASHRAE研究项目RP-477，“开发一种方法来预测实际运行条件下螺旋桨风机的振动响应。”该项目的目标是:确定并修改（如有必要）在个人微机上运行的、考虑离心硬化的商用有限元程序；并使用（1）中确定的程序帮助解释根据ASHRAE标准87预测的螺旋桨风扇临界转速之间存在的差异。 1以及在模拟运行条件下在相同风机上测得的相应临界转速。本文讨论了铆接叶片对螺旋桨风机振动响应的影响。使用有限元技术进行的实验测试结果和分析分析表明，风机的共振频率受铆钉类型和间距、铆钉连接的质量以及叶片连接到风机支架附近的风机叶片的弧度和曲率变化的显著影响。引文:ASHRAE Transactions，第95卷，pt。1989年，温哥华

Discrepancies between predicted and measured results have been reported by users of ASHRAE Standard 87.1-1983, "Method of Testing Dynamic Characteristics of Propeller Fans-Aerodynamically Excited Fan Vibration and Critical Speeds." It was believed that these discrepancies were associated with the fact that the standard did not take into account the effects of centrifugal stiffening in determining propeller fan critical speeds. To determine whether this was true, ASHRAE initiated ASHRAE Research Project RP-477, "Development of a Method to Predict Vibration Response of Propeller Fans under Actual Operating Conditions." The objectives of this project were:Identify and modify, if necessary, a commercially available finite element program that runs on personal microcomputers and that takes into account centrifugal stiffening; andUse the program identified in (1) to help explain discrepancies that reportedly exist between propeller fan critical speeds oredicted in accordance with ASHRAE Standard 87.1 and the corresponding critical speeds measured on the same fans in simulated operating conditions.This paper discusses the influence of riveted spiderto- blade connections on the vibration response of propeller fans. Experimental test results and analytical analyses using finite elementechniques indicate that the resonance frequencies of fans are significantly affected by the type and spacing of rivets, the quafity of the rivet connection, and the variations in the degree of camber and curvature of the fan blades in the vicinity where the blades are attached to the fan spider.