Research On The Key Technologies Of The Design Of The Mechatronic Products And The Cyber-Physical Systems

Nowadays, more and more embedded technologies are applied in the mechatronicproducts, which lead the system to become the complex muti-domain system includingmechanics, electronics, hydraulics, control etc. Moreover, the system has graduallyevolved into a new kind of complex system with information, network and intelligence.This is so called as Cyber-Physical Systems (CPS). It is necessary to study the digitaldesign methods for the new products to match the news characteristics, improve the designefficiency, reduce the research costs and shorten the development cycle. Based on thedigital modeling and simulation and the hardware-in-the-loop (HIL) simulationtechnologies, this paper deeply researched the key technologies of digital design in thedesign process for the current mechatronic products and prospective CPS with thecombination feature of Cyber and Physical. This research is conducted with the support ofNational863projects, natural science funds and the relevant research projects of COMAC.The research can be summarized as follows:(1). Analyzing and summarizing the current digital design of mechatronic productsincluding waterfall model, V model and modeling-design-analysis model, with thepointing of the problems in current product design process. By this way, the digital designmethods for the current mechatronic products and prospective CPS are discussed to statethat the key technologies and two main phases of the methods are digital modeling andsimulation and the HIL simulation. Based on muti-domain modeling and simulation, themethods could be applied into project design, detailed design and test.(2). As to the design of CPS, the modeling and simulation of it based on the Modelicalanguage and MWorks software becomes the better choice with the realization ofhierarchical modeling from the base model, synthesize model to system model. Moreover,the landing gear system is taken as an example that the model libraries of hydraulics,mechanics, electronics and control are established based on Modelica. Then the model ofsubsystems including retractable landing gear, nose-wheel steering, wheels brakes andenergy management are designed.(3).The principle of “electric-signal priority sub-section” is presented to divide thesystem into model and physics. In the HIL simulation, the key problems and keytechnologies are analyzed, including the RTI (Real-Time Interface) technology (ex: thecommunication between the model and hardware), code automatically generation formulti-target machine technology (ex: the efficient transferring from the model code tomachine code), and code automatically download for multi-target machine technology (ex:realizing the setting, running control and monitoring of the target machine). (4).Based on the researches on the digital design, a general digital design platformhas been implemented, which includes the digital simulation system, the simulation targetsystem and the integration management system. The digital simulation system is based onthe Modelica language and MWorks software to realize the hierarchical modeling. Theintegration management system is composed by the RTI and the code generation anddownload technologies. The simulation target system is based on the VxWorks toreal-time calculate the model.(5).For the landing gear system as a living example, the digital and HIL designplatform is established based on the general digital design platform with the additionaldevelopment of the signal simulation system and the dash board system. The subsystemsof retractable landing gear, nose-wheel steering, wheels brakes and energy managementcould be designed by the platform. Then the project design, detailed design and test couldbe optimized, verified, and analyzed respectively. The platform has been successfullyapplied into the landing gear system of ARJ21and C919in COMAC, which improves thedesign efficiency and shortens the development cycle.