防喷器控制装置的调试系统设计

为了实现对防喷器泵组自动启停、蓄能器组充压时间等一系列试压试验,构建了基于上下位机的防喷器试压实验装置。通过ADAM4117采集卡将压力变送器接收的压力信号实时采集并显示在由Matlab编写的上位机图形用户界面(GUI)上,上位机处理后将分析结果反馈到STC89C52RC单片机上,通过其控制防喷器防爆启动器的开关。该调试系统在防喷器控制装置的安全使用和检查维护中起重要作用,有助于提高学生分析问题和解决问题的能力。     

快速压缩机HCCI燃烧缸温度场测量

由于自主研发的快速压缩机进气时间长,缸内混合气与活塞、缸壁、缸盖等进行充分热交换而引起进气温度发生变化,影响燃烧特性分析结果。为此对快速压缩机燃烧缸进行测温,分别测得不同混合气温度和不同混合气压力对燃烧缸温度场的影响。结果表明,充气结束20s后燃烧缸内温度场与进气温度及进气压力关系不大,并采用最小二乘法拟合出燃烧缸内平均温度与缸盖上测量热电偶读数间的函数关系,采用修正后的进气温度使发动机模拟试验数据更加真实可靠,提高了燃烧特性分析的精确度和准确度。     

基于LabVIEW的井控设备试压实验系统设计

针对井控设备耐压合格检测的需求,基于NI的USB数据采集卡以及LabVIEW虚拟仪器组态软件设计了一套井控设备耐压检测的计算机测控实验系统。该系统实现了气动增压泵的启停控制,高低压压力信号的实时采集,试压全流程自动控制,试压数据的提取与保存,试压是否合格的自动判定,试压报告的自动生成和打印等功能。该系统已在某管具公司试压车间成功应用,运行状况良好,可以有效解决人工试压危险性高,效率低,结果不准确的弊端,可为油田现场用户提供准确的试压结果,同时可以提高试压过程的自动化水平。     

利用是阻应变片式压力传感器校核液压式万能试验机的方法

利用液压式万能试验机对金属与非金属材料进行拉伸、压缩、弯曲等试验时,试验机的精度是致关重要的。本文叙述了用电阻应变片式压力传感器校核液压万能试验机精度的方法。     

试论基于AMESim的汽车电子稳定系统轮缸压力精确控制

介绍了汽车电子稳定系统工作原理及模型,分析了轮缸压力精确控制计算方法。并对压力精确控制算法模型进行仿真和试验验证。验证结果表明,该控制方法满足实际工作需要,实现对传统控制方法的有效改进。有利于提高系统的稳定性和可靠性,在实际控制工作中需要重视该方法的运用。     

Jetta GTX轿车ABS液压制动管路压力瞬态特性模型

通过对Jetta GTX轿车制动防抱死系统（ABS）的液压管路建模，分析了ABS调节过程中的压力瞬态传榆特性，得出了在压力调节过程中轮缸瞬态压力的变化情况，并通过试验验证了模型的有效性。     

利用是阻应变片式压力传感器校核液压式万能试验机的方法

利用液压式万能试验机对金属与非金属材料进行拉伸、压缩、弯曲等试验时，试验机的精度是致关重要的。本叙述了用电阻应变片式压力传感器校核液压万能试验机精度的方法。     

基于小型缸体的钢珠自动对中机构研究

小型缸体是汽车产业中最关键的部件。小型缸体由于国内铸造技术偏低,导致缸孔偏心、对中结构误差大、钢珠受力过大等缺点。针对缸体孔偏心的小型缸体定位夹紧工装的国内现状,开发出一套适用小型缸体的钢珠对中机构,进行了受力分析。结果表明该对中机构具有在环境恶劣,湿式或干式加工等应用场合,定位准确可靠,使用寿命长的优点。在国内目前没有解决小型缸体铸造变形导致缸孔偏心的情况下,很值得大力推广,有很高的应用价值。     

BRW200/31.5乳化液泵滑块连接圆柱销挡块车胎的设计和日常维护

BRW200/31.5乳化液泵圆柱销是连接连接活塞杆于滑块的连接定位元件,为了不让圆柱销两端划伤活塞缸内壁,在圆柱销两端放置了材料为聚甲醛的两个挡块,挡块的圆弧面直径要于活塞缸内壁直径相同,并且还要有配合精度要求.为了保证配合精度设计了加工圆弧面的车胎工装.日常维护也是保证乳化液泵的正常工作的关键.     

洛河电厂#2机高压缸效率低原因分析

洛河电厂Ⅰ期#1、#2机组技术改造后,#2机在进行机组性能试验后发现高压缸效率比原本设备结构相同、调节方式相同的#1机明显偏低,通过对性能试验数据和运行数据进行深入对照分析,找出了造成#2机高压缸效率低的主要原因。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.