加速度传感器电激励等价性测试方法的研究

研究了采用电信号激励代替机械激励测试伺服加速度传感器动态特性的方法。理论上分析了电激励测试与机械激励测试结果的等价性及原理性误差。针对恒压源型的加速度计提出了一种新的等价性测试方法。实验结果进一步证实了理论分析及实验方法的正确性。     

电动车动态测试方法的研究

本文分析了反映电动车性能的主要参数,并从几个易于测试的参数（电压、电流、速度等）入手,推导出计算电动车行驶阻力,整车效率和电池内阻等参数的公式,解决了电动车整车在动态行驶过程中的测试问题,给出了动态测试系统的实现方案。     

小空间振动测试方法与应用

介绍一种新型小空间的振动测试技术——电磁法．利用电磁法原理制成的传感器，具有尺寸小、重量轻、安装方便等特点，用于测试板状元件在高速流场中流体诱发振动，取得了满意的结果，验证了这种方法的可靠性和可行性．     

婴儿培养箱性能参数测试方法探讨

早产儿一方面热量产生少,另一方面又不能较好地自我保存热量,在临床上经常出现早产儿体温不升或体温偏低。所以在临床护理中,对早产儿要特别注重其保暖,婴儿培养箱就是特别针对早产儿和低体重儿而设计的特殊护理场所。可见,婴儿培养箱的准确性对早产儿的治疗影响重大,所以对婴儿培养箱进行性能参数测试非常重要。     

提高放映画面动态分辨率的关键及片槽内影片颤动测试方法之探讨

本文对影响放映机画面动态分辨率的主要因素——影片颤动，按其不同来源作了分析；对放映机片槽内影片颤动的动态测试方法，提出了采用光栅位移传感器的设想。     

爆炸焊接条件下金属动态屈服强度的分析与计算

用比值的方法分析和计算了爆炸焊接条件下,爆炸复合材料结合区中塑性变形金属的动态屈服强度值。结果指出,在此高压、高速和瞬时的塑性变形过程中,金属的动态屈服强度值比其静态下的屈服强度值高１～３个数量级。因此,此时的金属仍是一个刚体,不能将其假设为不可压缩的流体。     

冲击速度对20Cr和40Cr的钢应变速率,动态屈服强度作用的研究

研究了不同热处理状态的２０Ｃｒ和４０Ｃｒ钢在不同冲击速度（Ｖ）下，应变速率（ε）和动态屈服强度（σａ）的变化规律，研究表明：σａ＝σ０ｅｘｐ（Ａｌｉε）、ε＝ａｅｘｐ（Ｂｖ），σａ＝σ０ｅｘｐ（Ｃｖ）其中只两个是独立的，并用粘塑性本构理论分析了同作用机制。     

金属材料动态强化机制的探讨

对纯铁在不同冲击速度和不同冲击交数下的动态屈服强度进行了试验研究，并对其微观结构进行了观察，探讨了在不同冲击条件下体心立方金属材料动态屈服强度上升的微观机理，给出了材料微观结构演化与其力学性能之间关系。     

冲击速度对20Cr和40Cr钢应变速率、动态屈服强度作用的研究

研究了不同热处理状态的２０Ｃｒ和４０Ｃｒ钢在不同冲击速度（ｖ）下，应变速率（ε）和动态屈服强度（σα）的变化规律，研究表明：σα＝σ０ｅｘｐ（Ａｌｎε），ε＝ε０ｅｘｐ（Ｂｖ），σα＝σ０ｅｘｐ（Ｃｖ）．其中只有两个是独立的，并用粘塑性本构理论分析了微观作用机制。     

光电反射式动态扭矩测试方法研究

针对等直径转轴动态扭矩测试方法计算模型和测量装置复杂以及测试范围受限等问题,提出了一种基于DASP的光电反射式动态扭矩测试方法。建立由光电反射式传感器和DASP系统等组成的动态扭矩测试系统,利用传感器光电脉冲信号的时差和相对转角,来实现动态扭矩测量。实测结果表明,通过调整传感器的位置,就可以实时、精确地实现扭矩的非接触式测量。这种测试方法为转轴的扭矩测试提供了一种新的技术途径。     

测试参数对橡胶阻尼材料动态热机械分析结果的影响

通过对橡胶阻尼材料动态热机械性能进行测试,研究了测试频率、升温速率、测试模式等参数对测试结果的影响。结果表明:测试频率和升温速率都对测试结果有较大影响,橡胶阻尼材料的动态力学性能参数随着测试频率和升温速率的增大均向高温方向移动,为了更好地表征材料的阻尼性能,最好采用较低的升温速率;另外,测试模式的选择、静态力动态力以及振幅的设定都会影响测试结果的准确性。     

Capability Testing Based on Cpm with Multiple Samples

Numerous process capability indices have been proposed in the manufacturing industry to provide unitless measures on process performance, which are effective tools for quality improvement and assurance. Most existing methods for capability testing are based on the distribution frequency approaches. Recently, Bayesian approaches have been proposed for testing capability indices C_p and C_pm but restricted to cases with one single sample. In this paper, we consider estimating and testing capability index C_pm based on multiple samples. We propose accordingly a Bayesian procedure for testing C_pm. Based on the Bayesian procedure, we develop a simple but practical procedure for practitioners to use in determining whether their manufacturing processes are capable of reproducing products satisfying the preset capability requirement. A process is capable if all the points in the credible interval are greater than the pre‐specified capability level. To make the proposed Bayesian approach practical for in‐plant applications, we tabulate the minimum values of for which the posterior probability p reaches various desirable confidence levels. Copyright © 2004 John Wiley & Sons, Ltd.     

Effect of Testing Normality on Estimating Process Capability Indices

Process capability indices are used to measure whether a manufacturing process meets the specifications. The studies of these indices are usually based on the assumption that the process follows a normal distribution. These include the indices C_p, C_pk, C_pm, and C_pmk. When the investigator is uncertain whether the process follows a normal distribution, a test of normality may be used to resolve the uncertainty. If the test accepts the null hypothesis that the process follows a normal distribution, the investigator uses C_p, C_pk, C_pm, or C_pmk. If the test rejects the null hypothesis, the investigator uses indices under non-normal distributions. Therefore the test of normality is a preliminary test that determines the form of the distribution and the index to use. In this paper we study the effect of the preliminary test of normality on the estimation of the four process capability indices mentioned above.     

The New Nino Capability Index for Dynamic Process Capability Analysis

The process capability analysis is a crucial activity to evaluate if the process outcome meets the design specifications. Classically, such analysis is performed by verifying the in‐control condition of the process and evaluating suitable capability indices, by assuming the process in‐control steady‐state condition. However, the in‐control period of the process characterizes only a part of the system functioning cycle, the one with the lower defective rate. In particular, the system functioning cycle is also characterized by the out‐of‐control period, during which a greater defective rate is produced, and such increasing is not considered by the widely adopted capability indices. As consequence, the classical approaches to perform the process capability analysis involves an overestimation of the process capability level. For this reason, in order to overcome the previously described limitation, in the present paper it is proposed a new capability index based on the real defective rate of the process. Thus, such new index is able to estimate the real process capability level. Finally, in order to compare the new index to the conventional C_p capability index, a numerical comparison study related to a process capability analysis is carried out, and the related practical considerations are given. Copyright © 2013 John Wiley & Sons, Ltd.     

A Bayesian Approach to Capability Testing Based on Cpk with Multiple Samples

Process capability indices provide numerical measures to compare the output of a process to client's expectations. However, most of the existing researches have used traditional distribution frequency method by using a single sample due to assess process capability. An alternative to this approach is to use the Bayesian method. In this paper, we utilize a Bayesian approach based on subsamples to check process capability via capability index C_pk. As a new suggestion, we used the informative normal prior distribution and the characteristics of sufficient statistic of the parameter to drive the posterior distribution. The capability test is done, and the posterior probability p, for which the process under investigation is capable, is derived both based on the most popular index C_pk. Finally, a numerical example is given to clarify the method. Copyright © 2013 John Wiley & Sons, Ltd.     

镁碳材料抗热震性测试评价方法

整体塞棒棒头普遍采用具有优异抗熔钢侵蚀性的镁碳材料,但是由于镁碳材料抗热震性差,从而容易导致塞棒在使用过程中出现掉头、掉块现象,严重影响了钢厂的连铸生产过程.研究探索适宜镁碳材料抗热震性测试评价法,并制作具有优异抗热震性的镁碳材料对保证整体塞棒安全使用性至关重要.因此,本试验通过采用不同配方镁碳棒头材料对比研究水急冷法和浸钢法抗热震性试验方法,从而探索出适宜镁碳材料抗热震性测试评价方法.     

称重显示器检测方法探讨

本文简要阐述了与传统检测法相比,选用信号模拟器作标准信号装置来检测数字式称重显示器的几个特点。     

Dynamic Testing of Waveform Recorders

Four waveform recorder tests are presented that characterize dynamic performance using sine-wave sources. Each test illuminates different aspects of dynamic performance, and in some cases indicate the specific errors limiting performance. Pitfalls in using the tests are also examined.     

离子束增强沉积工艺参数对Cr-N膜层组织结构的影响

利用离子束增强沉积技术, 在 Ｓｉ （１１１） 和 Ｇ Ｃｒ１５ 轴承钢基体上沉积 Ｃｒ Ｎ 镀层研究氮分压、 Ｎ^＋ ＋ Ｎ^＋_２ 离子轰击能量和 Ｎｉｏｎｓ Ｃｒ ａｔｏｍｓ 到达比对镀层组织结构的影响结果表明, Ｃｒ- Ｎ 镀层组织对氮分压敏感, 随着氮分压的增加, 镀层中 Ｃｒ Ｎ 组份增加, 金属 Ｃｒ 及 Ｃｒ_２ Ｎ 组份减少; 随着氮离子轰击能量的增加, Ｃｒ- Ｎ 镀层中 Ｃｒ Ｎ （２００） 择优生长; 但当 Ｎ ｉｏｎｓ/Ｃｒ ａｔｏｍｓ 比从１４５ ×１０ ^{－ ２} 增至５.８７ ×１０ ^{－ ２} 时, 镀层中 Ｃｒ Ｎ 组份非但没有增多, 反而使镀层中的 Ｃｒ 以 Ｃｒ_２ Ｏ_３ 形态存在.