Chapter seven studies the methods of finding resonance frequency of centrifugal worm housing, analyses the relationship between the sound radiation of fan and wheel tip velocity index under different worm housing sound impedance and a new noise control method is presented for centrifugal fan.
第七章，研究了离心风机蜗壳基频共振频率及高阶模态频率的确定方法，分析了蜗壳声阻抗及其对叶轮声辐射轮缘速度指数的影响，为风机的降噪提供了一种新的途径。
The difference in terms of control index and standard of typical wheel tracking test specimen was reviewed.
回顾了典型车辙试验试件成型控制指标与标准的不同，并且分析了加利福利亚HVS测试结果。
The grading instrument of balance wheel and hair spring is an important check and sorting equipment in the watches manufacturing industry. Its performance influences mechanical watch core components & the quality index of balance wheel and hairspring.
而游丝摆轮分档仪是钟表生产行业中重要的校验和分拣仪器，它的性能影响着机械钟表核心零件&摆轮和游丝的质量指标，影响着钟表产品的计时精确度和产品质量。
The method of statistics linearization is applied to determine the probability structure of the responses to the random vibration of non-linear systems On railway cars, to determine such dynamic characteristics in operation as the running stability index, suspension stroke, wheel-rail clearance, and wheel unloading rate.
应用统计线性化方法确定铁道车辆非线性系统随机振动响应的概率结构，确定其运行的动力学特性如运行平稳性指标、悬挂动行程、轮轨间隙和轮重减载率等。
The dynamic performance is calculated under different condition, and the running safety and wheel wear index are investigated.
分析了各工况下的动力学性能，研究了横风和轨道激励对列车运行安全性及车轮磨耗的影响。
The diameter, width and loads of driving wheel and terrain cone index are considered.
方程考虑了驱动轮直径、宽度、垂直载荷和土壤圆锥指数值。
Based on the Cone Index bearing capacity and shearing strength of paddy in Hunan Province, we designed the lug wheel for powered tiller in this province.
根据湖南省一般淹水水田和旱态水田的圆锥指数承压特性及土壤力学参数剪切特性来设计湖南独轮耕整机的驱动轮。