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Modelling of metalic seal seats

金属密封座建模

基本信息

批准号：
384871263
负责人：
Professor Dr.-Ing. Hubertus Murrenhoff
金额：
--
依托单位：
Institut für fluidtechnische Antriebe und Systeme (ifas)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/384871263?language=en
关键词：
Modelling metalic seal seats

项目摘要

Static sealing seats are machine elements of high importance in a number of fluid applications. Their essential task is to prevent unwanted leakage. Sealing seats can be classified into soft sealing, mostly based on elastomers, and hard sealing contacts, i.e. metallic contacts. Even though the composition of a hard sealing metallic contact is very simple, it is impossible to reliably predict the leakage based on design- and operating parameters to this date.An important application for hard sealing components can be found in seat valves. One common use of this valve type is in mobile hydraulics as load holding valves in order to prevent accidental safety relevant machine movements. The design of a seat valve is based on expert know-how and experience. This leads to a dimensioning towards the safe side and therefore to an oversizing of the sealing seat regarding it´s force and geometry. The result is an unnecessary large installation space, decreased dynamics and most times a limited fatigue strength of the valve.A new approach to describe two contact partners was developed by Dr. Bo Persson. The so-called contact mechanics theory is able to model soft sealing contacts and predict the resulting leakage correctly.Goal of this project is to apply the contact mechanics theory for hard sealing contacts and derive a general model to describe metallic sealing seats. The result is a theoretical concept with a physical motivation which includes parameters such as plastic deformation and surface roughness. For the development and validation of the general contact model, test rigs will be designed and built in order to investigate varying parameters separately and to compare the measurements with the model. Additionally, multi-dimensional FEM and CFD simulations are performed to obtain parameters for the validation, which cannot be measured. The results lead to an enhanced model describing hard sealing contacts, which is validated consecutively by a real application test rig.Scientifically, the description of the contact mechanics between two contact partners is advanced on the one hand. On the other hand the basis for a profound development of metallic sealing seats and the holistic advancement of seat valves is established. This is achieved by the development of a method which describes the contact mechanics of hard-hard-contacts. This method together with the resulting findings is expected to be applicable to other engineering fields with similar contact areas (interference fit, bolted connections etc.).

静密封座是许多流体应用中非常重要的机械元件。它们的基本任务是防止不必要的泄漏。密封座可分为软密封（主要基于弹性体）和硬密封接触（即金属接触）。尽管硬密封金属触点的组成非常简单，但迄今为止，仍无法根据设计和操作参数可靠地预测泄漏。硬密封部件的一个重要应用是阀座阀。这种类型的阀的一个常见用途是在移动的液压系统中作为负载保持阀，以防止意外的安全相关机器移动。阀座阀的设计基于专业知识和经验。这会导致尺寸偏向安全侧，从而导致密封座的力和几何尺寸过大。结果是不必要的大安装空间、降低的动力学和大多数情况下阀门的有限疲劳强度。Bo Bohesson博士开发了一种描述两个接触伙伴的新方法。所谓接触力学理论能够模拟软密封接触并正确预测由此产生的泄漏。本项目的目标是将接触力学理论应用于硬密封接触，并推导出描述金属密封座的通用模型。其结果是一个理论概念与物理动机，其中包括参数，如塑性变形和表面粗糙度。为了开发和验证一般接触模型，将设计和建造试验台，以分别研究不同的参数，并将测量结果与模型进行比较。此外，还进行了多维FEM和CFD模拟，以获得无法测量的验证参数。结果导致一个增强的模型描述硬密封接触，这是验证了连续的真实的应用试验台。另一方面，为金属密封阀座的深入发展和阀座阀的整体进步奠定了基础。这是通过开发描述硬-硬接触的接触力学的方法来实现的。该方法和所得结果有望应用于具有类似接触面积的其他工程领域（过盈配合、螺栓连接等）。