Z512-2型台式钻床试验模态分析

选用PULSE^TM-3560C便携式多分析仪系统和Me’Scope^TM模态分析软件对台式钻床进行试验模态分析，验证了台式钻床设计的合理性。     

高炉TRT煤气管道振动模态分析

针对某公司高炉TRT煤气管道系统在工况切换时管道振动大的问题,应用有限元与试验模态分析相结合的方法,对煤气管道进行模态分析,求得其模态数值和振型,为开展煤气管道系统减振降噪工作提供了可靠依据.     

氧气顶吹转炉模态分析的研究

应用模态分析技术，通过模态实验及模态参数辨识，给出转炉若干阶模态参数，根据给出的模态振型，利用ＴＴＶＰ程序优化设计大型转炉扭力杆，得出ＫＲ与ＭＴｍａｘ关系最优值，并进一步进行模态分析，得出理想振型。     

轴承外圈裂纹损伤的模态参数对比研究

轴承结构的表面损伤对其振动特性具有显著影响。以6307滚动轴承为研究对象,采用有限单元法分析了轴承外圈出现不同尺度的裂纹缺陷后,其固有特性的变化情况。其中,着重探讨了系统固有频率、位移模态以及应变模态参数对外圈损伤的敏感程度。     

油液对油底壳模态的影响分析

针对柴油机湿式油底壳的振动特性问题,以4120s型柴油机为例,采用有限元法对不同充液量的油底壳模态频率和振型特征进行分析,并对存在油液时的油壳系统进行增加加强板的结构改进.结果表明:随着机油量的增加,油底壳模态频率逐渐降低,模态振型也发生了显著变化;形貌优化后的油底壳,固有频率有较大提高,刚度大幅度增加,有利于减振降噪.     

随机信号与振动分析系统在750m^3高炉汽轮鼓风机上的应用

通过750m^3高炉汽轮鼓风机动叶片固有频率测定及一级动叶片模态试验，探索随机信号与振动分析在旋转机械上的应用，并为风机安全运行提供理论依据和预防措施。     

基于系统CAE技术的结晶器液压振动装置仿真分析

针对某钢铁设计院设计的结晶器液压振动装置,采用系统CAE技术对整体设备进行仿真分析,建立了该振动装置整体CAE模型。通过静力分析得出了整体位移及应力分布情况,采用模态分析得到了其低阶固有频率及其振型,满足了工程设计的分析要求。     

直线振动开铁口机模态分析及起制动过程分析

本文运用振动理论对直线振动开铁口机进行了模态分析及起制动过程分析，在设计阶段，通过系统的动力学特性分析可以修改某些可变参数，使其运动处于最佳状态，从而提高其性能，同时使系统的动载荷减小到最低限度，提高振动开铁口机的强度和使用寿命。对于现有的直线振动开铁口机，进行动力学特性分析，可提出改进设计的有效方案。在此理论分析和现场实测数据的基础上编制了相应的软件，从而为提高此开铁口机的设计水平打下了基础     

XGK1400冷轧机的结构分析与优化

采用有限元和三维参数化设计方法,对XGK1400不锈钢冷轧机的机架展开静力分析和模态分析,研究机架的应力和应变分布情况,以及各阶模态振型特点并进行了结构优化。冷轧机的各阶固有频率得以提高,静态特性也得到改善,避免了工频造成的振动误差,有利于提高精密带材的质量。     

工艺参数对热轧机振动固有特性影响分析

 某钢厂热连轧生产线F2机架在轧制薄规格产品时发生了强烈的振动现象。为了更好地识别轧机振动的类型,抑制轧机振动,需对轧机系统的固有特性进行全面分析。考虑水平、扭转和垂直系统的振动,并考虑带钢和轧机系统的耦合作用建立热轧机11自由度振动模型,分析轧机系统在无带钢下的固有特性,并分析各阶模态对惯性参数和弹性参数的灵敏度。同时分析带钢和轧机耦合作用下前后张力、入口厚度、出口厚度、摩擦因数、变形抗力等工艺参数对轧机系统固有特性的影响。研究结果表明,带钢和轧机相耦合成一种变结构系统,系统固有特性随着工艺参数的变化而变化,工艺参数主要通过改变第4阶模态和第10阶模态来影响系统固有特性。不同的工艺参数对轧机系统固有特性的影响程度不同,入口厚度影响最为显著,可以通过改变工艺参数来改善系统固有频率。可以为轧机振动类型的识别和振动的抑制提供指导。     

弹性耦合激励振动筛有限元结构模态分析

利用SAP5P程序计算了弹性耦合激励振动筛前10阶固有特性，计算结果表明：从降噪观点看，前10阶模态应采取抑制措施；从提高寿命观点看，应注意第2阶和第4～10阶模态．同时提出了为降噪增寿而采取的较为合理的结构修改措施．计算结果与理论分析相吻合．     

日汉语气助词对比研究及其对教学的启示

为了加深学习者对日语终助词和汉语语气助词的理解和掌握，对两者进行了对比分析，指明两者共性存在于“使用场合——对话与独语”“句中位置”“地域性”和“重叠使用”四方面；差异存在于，日语终助词具有“男性用语和女性用语”的特点，且交际功能发达。与日语相比较，汉语中表示疑问的语气助词比较丰富，使用复杂。针对以上学习难点，提出参考性的教学方案。     

高温重载工业机械手结构动态特性的研究

通过建立高温重载工业机械手有限元模型,求解出振动频率与振型,为研制高温重载工业机械手具有良好的动力学特性提供依据。     

应用灰色理论预测呼吸性粉尘浓度变化趋势

在矿山呼吸性粉尘监测中 ,有时需要补充缺失的数据 ,有时出于安全环保的原因 ,需要提前知道数据。本文引入了灰色理论中的GM(1,1)模型 ,对呼吸性粉尘浓度变化趋势进行预测。通过对 2 0 0 0年德兴铜矿、永平铜矿、武山铜矿、银山铅锌矿、东乡铜矿五个矿山四个季度粉尘数据进行分析 ,建立了相应的灰色预测曲线。误差分析表明 ,这些曲线有较好的预测效果。     

Modal attention asymmetry in patients with schizophrenia and bipolar disorder.

This cross-sectional study examined modal attention asymmetries in patients with schizophrenia (n?=?47) and bipolar disorder (n?=?42), as contrasted to a matched-sample comparison group of normal participants (n?=?89). A test of continuous auditory and visual attention was the primary measure. The data were analyzed from 2 experimental conditions: simple modal responses (auditory and visual) and modal switching responses (ipsimodal and cross-modal switching). In the simple modal condition, patients with schizophrenia demonstrated a visual over auditory asymmetry; patients with bipolar disorder showed no differences. In modal switching conditions, however, patients with bipolar disorder displayed a significant auditory over visual asymmetry. No main effect was detected between medications and attention functioning. Results are discussed in light of differentiating these 2 populations on the basis of modal specificity of attention functioning. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ideology, personality, and institutional policy in the mental hospital.

Individual and collective modes of analysis of ideology in a mental hospital were made. In the individual ideology was assessed by a custodianism-humanism scale. In the collective unit an assessment was made with respect to the degree of custodialism in its policy requirements and in the modal ideology of its personnel. It was found that the individual preferred a custodialistic orientation which was part of a broader pattern of personal authoritarianism. In the collective unit there was found to be considerable congruence between policy, modal ideology, and modal personality. 15 references. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Numerical Simulation and Experimental Study of an Ultrasonic Waveguide for Ultrasonic Casting of 35CrMo Steel

To achieve ultrasonic casting of 35CrMo steel,the waveguide unit for introducing ultrasound into liquid steel was studied numerically and experimentally.The structure and length of the ultrasonic waveguide were opti-mized by modal analysis.The simulation results showed that a T-shaped waveguide unit matched the vibrational sys-tem better than an L-shaped unit.The performance of T-shaped waveguide unit was optimized when the length of the ultrasound radiator was 135 mm.The performance of the T-shaped waveguide unit was investigated in ultrasonic casting experiments,and the effect of ultrasound on the microstructure of 35CrMo steel was examined.The experi-mental results showed that the T-shaped waveguide was able to successfully introduce ultrasound into the 35CrMo melt.In addition,the use of a silicon nitride ceramic radiator avoided high-temperature corrosion in the molten metal. The microstructure of the treated area was significantly refined and equiaxed grains were obtained.The results repre-sented a novel method for ultrasonic casting of steel.