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1、国内图书分类号：TP23国际图书分类号：621工学硕士学位论文伺服阀喷嘴流量测试台精度实验及配对算法研究硕 士 研究生：孟健 导师：邵东向副教授申 请 学 位：工学硕士学 科、专 业：机械制造及其自动化所 在 单 位：机电工程学院答 辩 日 期：2008 年 6 月授予学位单位：哈尔滨工业大学Classified Index: TP23 U.D.C.: 621Dissertation for the Master Degree in EngineeringRESEARCH ON PAIRING ALGORITHMAND PRECISION EXPERIMENT FORFLOW MEASURIN
2、G DEVICE OF SERVOVALVE NOZZLECandidate: Supervisor: Academic Degree Applied for: Speciality:Meng Jian Associate Prof. Shao Dongxiang Master of Engineering Mechanical Manufacturing and Automation Affiliation：School Engineeringof MechatronicsDate of Defence: Degree-Conferring-Institution:June, 2008 Ha
3、rbin Institute of Technology哈尔滨工业大学工学硕士学位论文摘要电液伺服阀是液压伺服系统的核心部件，其中双喷嘴挡板电液伺服阀在 航天、航空、航海等领域应用最为广泛。喷嘴是伺服阀的一个重要零件，其 小孔的压差流量特性将直接影响到伺服阀性能，小孔的尺寸很小，很难进行 准确的测量，一般采用高精度的流量特性测量。在双喷嘴挡板电液伺服阀中 要求对称结构，因此需要一对甚至多对流量性能相近的喷嘴，这种选取一对 或者一组喷嘴的过程就是喷嘴配对。目前国内伺服阀喷嘴配对还停留在人工 配对的阶段，效率低、劳动强度大、误差大，不易最优配对。 本文在研究伺服阀喷嘴小孔压差流量特性的基础上，根据
4、伺服阀喷嘴流 量测试台的测量特点，研究适合于喷嘴自动配对的算法，满足工厂的生产需 要。提高配对效率，实现最优化的配对结果和过程。 首先，通过小孔节流公式分析影响小孔流量大小的因素，同时对伺服阀 喷嘴流量测试台进行精度实验，分析测试台性能对测量结果影响。 其次，根据小孔流量的特点和测量结果的特点，参考人工配对的算法， 选择出适合于喷嘴配对的算法。并对各种算法进行实验，选取最优的配对算 法。 最后，在测试台自动测量软件和数据库的基础上，完成伺服阀喷嘴配对 程序，满足生产要求。 关键词电液伺服阀；喷嘴；小孔流量；配对算法-I-哈尔滨工业大学工学硕士学位论文AbstractElectro-hydrau
5、lic servo valve is the core component of hydraulic servo system and the twin flapper-nozzle electro-hydraulic servo valve is widely applied in the navigating control field for astronavigation, navigation and aviation. Nozzle is a very important part in servo valve, whose flow characteristic under va
6、rious pressure differences directly affects the function of servo valve, and it is difficult to guarantee its service performance by measuring the dimension, so a high precise measuring instrument is urgently required. The twin flapper-nozzle electro-hydraulic servo valve has strict symmetric struct
7、ure, so the pairs of nozzle is required which has consistent flow characteristics, and the process to select the pairs of nozzle is called as “nozzle pairing”. At present, the domestic factories for servo valve mostly adopted manual measuring method to select the pairs of nozzle. This traditional me
8、thod is usually affected by many labile factors such as workers technical ability, responsibility, tiredness and so on, and it has heavy labor intensity as well as high error rate, so the pairing efficiency is very low, furthermore, it is difficult to obtain optimum pairing results. Based on the dee
9、p research of flow characteristics for the small orifice of nozzle, and according to the feature of the nozzle flow measuring device, this dissertation studied automatic pairing algorithm of nozzle in detail, and verifiedthat the pairing algorithm can satisfy the demand of practical production in fa
10、ctories of servo valve, enhance the pairing efficiency greatly, and realize the optimum pairing process and result. Firstly, this dissertation studied the factors which affect the flow of small orifice of nozzle through analyzing the formula of small orifice flow throttling, carried out the precisio
11、n experiment for the nozzle flow measuring device, and then analyzed the effect of the performance of testing device on measuring accuracy. Secondly, according to the characteristics of the discharge of small orifice and measuring results, the appropriate algorithms for nozzle pairing was designed b
12、y using the artificial pairing algorithm for reference. The optimum pairing algorithm was selected and justified by the comparative experiments for various- II -哈尔滨工业大学工学硕士学位论文pairing algorithms. Finally, based on the automatic measuring software and database of nozzle testing device, the pairing pr
13、ogram was designed, and the experiment result indicated that the pairing program can satisfy adequately the requirement of high speed and accuracy nozzle pairing.Keywords electro-hydraulic servo valve, nozzle, the flow of small orifice, pairing algorithm- III -哈尔滨工业大学工学硕士学位论文目录摘要 .I Abstract . II第 1 章 绪论 . 1 1.1 课题背景 . 1 1.2 国内外发展状况 . 3 1.2.1 喷嘴测量技术发展状况 . 3 1.2.2 伺服阀喷嘴配对的现状 . 4 1.3 课题研究的目的和主要内容 . 5 第 2 章 伺服阀喷嘴测试原理和精度实验 . 7 2.1 引言 . 7 2.2 小孔节
