1、1Research of Collaborative Simulation Modeling of Highspeed Machine ToolsAbstract. Dynamic effects of machining processing could not be ignored with the increasing speed of CNC machine tools， the analysis of kinematic behavior related to the kinematics， dynamics and control system etc， and there wer
2、e a lot of coupling relationship of these systems. A simulation of single discipline could not reflect the overall performance with having to the simplification of the other discipline. It proposed a collaborative simulation modeling method based HLA for CNC machine tools. The development process of
3、 HLA-based simulation mainly involved system design， high level modeling， domain modeling， transformation of domain models， federal integration. Finally， this paper described an open architecture of collaborative simulation modeling with RTI， and developed the dynamics and control system models usin
4、g Matlab and Adams software respectively. It provided theoretical support to solve coupling and interaction of the multi domain models of machine tools products in the design and development. Keywords： High Level Architecture； Collaborative 2Simulation； Collaborative Modeling； High-speed Machine Too
5、ls 1 Introduction NC machine tool is a typical electromechanical integration product， in which multiple fields such as machinery， control， heat transfer， and electronics are involved and there are a large number of system parameters in complex coupling. Especially as NC machine tools processing spee
6、d and machining accuracy are constantly improved， the coupling and interaction between fields has become one of the key problems of affecting the improvement of NC machine tools dynamic performance. Collaborative modeling “assembles“ the models in different disciplines such as machinery， control， hy
7、draulic pressure， and pneumatic machinery to be a larger simulation model for applying it to the simulation and analysis of the product performances. In reference 1， a study of NC machine tool dynamics joint simulation based on the joint surface modeling is proposed； in reference 2， a study of the d
8、ynamic characteristics of NC machine tool feed drive system based on rigid-flexible & electrical-mechanical coupling collaborative modeling is proposed； in references 3-4， the simulation of NC machine tool feed servo drive system is implemented based on Adams and Matlab joint simulation method. 3The
9、se studies are mainly based on the interfaces in tool software CAE for realizing the multidisciplinary collaborative modeling， and the shortcoming is that the data interface is often owned by a company privately， but these companies have not standard and openness so that they are difficult to expand
10、 it， and also can only make integrated emulation in a single computer without supporting distributed simulation. In references 5-6， a study of applying multidisciplinary modeling and simulation to high-speed motorized spindle and CNC milling machine based on unified modeling language Modelica is pro
11、posed. The downside of this approach is that a large number of domain model libraries should be built， for coping with the disabled effectively reuse in the previous models. HLA （High Level Architecture） provides a common technical framework for complex system modeling and simulation， aiming at prom
12、oting model reuse and interoperability. HLA will unite the simulation models of all areas for orienting at the collaborative simulation of the whole product and improving product performance， and also good results have been studied and obtained currently in motors， forging operation machine， and oth
13、er complex products 7-8. In this paper， the collaborative simulation model of NC machine tool is 4constructed based on HLA collaborative modeling method. 2 The collaborative modeling based on HLA Collaborative modeling is the basis and prerequisite for multidisciplinary collaborative simulation， in
14、which the entire modeling process can be divided into system design， high-level modeling， domain modeling， domain model transformation， federal integration， etc. In this paper， HTC2550hs high-speed numerical control turning processing center is used as the study object， as shown in figure 1： it impl
15、ements the turning processing of components through the combination of axis X and axis Zs straight line feed movement with spindle rotary motion， and the core components of the turning is a unit of the feed system and spindle. 2.1 The system design NC machine tool multidisciplinary collaborative sim
16、ulation model is mainly made up of control model， electrical model， and multi-body dynamics model. Multi-body dynamics model includes workbench， principal axis， and feeding system as the controlled system， and also randomly sends the current state of the machine tools information to the controller m
17、odel. Controller model is used in the controller for the simulation to receive the state information from the multi-body dynamics 5model， and also produces control signal with the support of a certain control algorithm and then transfers to the drive model. Driver model makes the simulation of the e
18、xecutive components such as servo driver and servo motor， and also transfers to multiple parameters such as driving moment and direction the multi-body dynamics model by receiving control information， so that an interaction among three areas is completed， as shown in figure 2. 2.2 High-level modelin
19、g High-level modeling is to make system design concrete on the basis of system design and HLA standard， and this model includes federal object model and federation member model. The high-level model based on HLA standard provides the basic information description for multidisciplinary collaborative
20、model and its sub-model， including the behavior of the model characteristics， interface requirements， interactions， and so on. The high-level model can be used for guiding the development process of the federal members， and also ensures the final multidisciplinary collaborative simulation model well
21、 integrated. 2.3 Domain modeling Domain modeling is to decompose the modeling tasks of the complex products involving the multidisciplinary knowledge into 6the concrete modeling tasks of multiple disciplines， and also assign them to the development teams of different disciplines. This is a top-down
22、process， and the development of a certain discipline domain model is usually completed y the corresponding group with the support of the discipline oriented simulation software. Dynamic model is implemented with ADAMS， and a series of processes such as 3d modeling and assembly are implemented with 3
23、d software SolidWorks， and then the geometry， quality， and constraint relationship of the 3d model is input into software ADAMS in the format of Parasolid， and also the material and constraint relationship of components are added. In figure 3， the dynamic model of the high-speed numerical control tu
24、rning processing center HTC2550hs feed workbench is shown. The control system and drive modeling of NC machine tool are usually done by Matlab. In figure 4， the axis-Z control system model for HTC2550hs machining center is shown： a three-closed loop structure including current control， speed control
25、， and position control is usually applied to the linear servo system； the three rings are controlled in the serial control mode； position control is based on the speed and current control； the dynamics of the position control system 7is basically guaranteed by the inner ring， while the steady state
26、accuracy is mainly accomplished by outer ring. 2.4 Model transformation The discipline model generated using different simulation software in o the domain modeling stage usually does not provide the collaborative simulation mechanism， so the multidisciplinary collaborative simulation cannot be direc
27、tly implemented， and model transformation is mainly to solve the collaborative simulation integration problems of commercial software. In terms of engineering standpoint， the main task of the domain model transformation stage is to transform the discipline domain model into the federal members of su
28、pporting the collaborative simulation model. Usually， it is implemented in the way of adapter， and Adams adapter and Matlab adapter are mainly involved in the collaborative modeling process of NC machine tool. The development of adapter will occupy certain workload， but it will applied as a high-deg
29、ree reuse component to the collaborative simulation system after the development is completed. 2.5Federal integration Federal integration is a process to integrate all federal member models into a unified multidisciplinary collaborative simulation federal process according to the needs of 8collabora
30、tive simulation after the domain model is encapsulated， namely， a process of collaborative simulation， including time strategy management， data distribution and order， and so on. 3 Collaborative simulation based on HLA HLA， by providing a general， relatively independent operation support framework R
31、TI （Run Time Infrastructure） ， makes the specific simulation function implementation， simulation operation management， and underlying communication separate， so that each discipline simulation model such as machine tools dynamic model established with Adam and the control system model established wi
32、th Matlab relatively independent； the standard function and service can be implemented using the latest technologies of all disciplines to the maximum degree， and its system structure is as shown in figure 5. RTI is a support environment for simulation operation， and has provided the underlying comm
33、unication and transport services， including six major modules （federal management， declaration management， object management， ownership management， time management， data distribution）. 4 Conclusion The multidisciplinary collaborative modeling based on HLA 9can give full play to the advantages of sim
34、ulation tools in all areas respectively， strengthen the coordination and cooperation between the designers in different areas， better integrate interdisciplinary coupling and interactions， and also reuse the existing information resources effectively. In this paper， a collaborative simulation model
35、is established using high-speed NC machine tool as application object， and then the collaborative simulation will be studied around the interface relationship between different disciplines， so that more comprehensive， more accurate dynamic performance parameters are obtained than those in single CAE
36、， and also a powerful support is provided for the development and design of the complex products such as NC machine tool. References 1 Dan XU， Qiang LIU. Study on the Joint of NC Machine Tool Dynamics with Simulation based on the Joint Surface Modeling J. Mechanical Design and Manufacturing， 2008， （
37、3）： 9-11. 2 Yanfeng YAO， Qiang LIU， Wenjing WU. Dynamic Simulation of a Linear Motor Feed Drive System based on Rigid-flexible & Electrical-mechanical Coupling J. Journal of Vibration and Shock， 2011， 30 （1）：191-196. 3 Xianin 10YE， Dongsheng ZHANG， Bin FENG. United Simulation about CNC Machine Tool
38、Feed Drive System based on ADAMS and MATLAB J. Machine Tool & Hydraulics， 2013， 41（15）：160-163. 4 Qin Yao， Yongguang LIU， Zhijia LIU. United Simulation about CNC Machine Tool Feed System based on ADAMS and MATLAB J. The Fifth National Fluid Transmission and Control Conference （The Conference on Hydr
39、aulic and Pneumatic Air China Institute in 2008）. 5 Longyuan WU. Study on the NC Milling Machine Multi-field Modeling and Simulation J. Masters Degree Thesis of South China University of Technology， 2012. 6 Xing KUANG. High-speed Machining Centers Feed System Multi-field Modeling Technology J. Maste
40、rs Degree Thesis of Huazhong Institute of Technology， 2012. 7 Tianyuan XIAO， Wenhui FAN. HLA based Integrated Platform for Collaborative Design， Simulation， and Optimization J. Journal of System Simulation， 2008， 20（13）： 3542-3547. 8 Miaomiao Fan， Yushun Fan， Shuangxi Huang. Design and Simulation Supportive Platform for Forging Manipulator System J. Journal of Mechanical Engineering， 2010， 46 （11）： 76-82.
