1、 本科毕业设计本科毕业设计(论文论文) 题目： 谐振式电液疲劳试验机的设计 i 谐振式电液疲劳试验机的设计 摘摘 要要 在工业生产中，人们发现在交变应力的作用下，机械零件往往会在远低于材料强度极 限的情况下发生破坏，这就是疲劳失效。疲劳失效已经成为正常工作状况下零件、材料的 主要失效形式。零件材料的使用性能与材料的疲劳特性密切相关。用于研究材料疲劳特性 的试验成为疲劳试验。疲劳试验已经成为为工程技术领域的基本试验，而疲劳试验机是研 究材料疲劳特性的基本设备。 疲劳试验机有很多种类，其中电液疲劳试验机是其中很重要的一类。电液疲劳试验机 具有响应速度快、输出功率大、测量和控制精度高等特点，已经在航
2、空、航天、军事、冶 金、交通、工程机械等领域得到了广泛应用。 当策动力的频率和系统的固有频率相等时，系统受迫振动的振幅最大的现象成为谐 振。谐振式电液疲劳试验机是采用谐振原理设计的电液疲劳试验机。这种疲劳试验机的固 有频率与系统中执行元件液压缸的容积有关，因此可以通过改变液压缸活塞的位置调节系 统的固有频率，使系统能够产生共振，从而在较低作用力下是试件产生较大的变形。因此 它不仅具有传统电液疲劳试验机精度高、功能全、可靠性好等特点，而且效率高，节约能 源。可以在很低的工作频率下获得高的试验负荷。 本文对谐振式电液疲劳试验机的相关概念，研究现状，发展趋势进行介绍，建立阀控 液压缸系统的数学模型，
3、并且进行试验机执行机构液压缸和试验机机体机架的设计，并进 行必要的校核。 关键字关键字： 谐振，疲劳试验，试验机，液压缸，机架 ii Design of Resonant Electro-hydraulic Fatigue Testing Machine Abstract In the process of industrial production, it has been founded that with the effect of an alternating stress, mechanical parts are often destructed well below its ma
4、terial strength failure limit. This is the concept of fatigue destruction. Fatigue distruction has become the main failure form of parts and materials in normal operating conditions. The usage properties of machines material is closly related to its fatigue property. Fatigue test is the test is to s
5、tudy the characteristics of material,which has become the basic test in engineering and technology. Fatigue test machine is the basic equipment to study the characteristics of materials. There are various kinds of fatigue test machine,among which electro-hydraulic fatigue testing machine is a very i
6、mportant one.It has advantage of fast response,large output power, high accuracy of measurement and control, and have been applied in aviation, aerospace, military, metallurgy, transportation, engineering machinery and many other fields. When the driving frequency are equal to the natural frequency of the system, the phenomenon that amplitude of forced vibration amplitude arrive its maximum is called resonant. Resonant type electro-hydraulic fatigue testing machine is developed according to th
