Research on the application of the hottest PDM tec

Research on the application of PDM technology in mechanical reliability design and analysis

Product integration technology has been developed for many years. From the widespread popularity of computer-aided design tools represented by C3P (cad/cae/cam/pdm) in the industry to the gradual maturity of m3p (multibody system, Mul tidisci plural collaborative, multi domain physical modeling, product lifecycle management) since the mid-1990s, Computer aided design emphasizes more on the research and development of system dynamic design of complex mechanical products based on multi-body system, optimization design based on multidisciplinary collaborative integration framework, multi domain unified modeling technology based on constitutive fusion, and reusable mechanical, electrical, hydraulic, and control digital functional prototype analysis, and gradually forms related technologies and software platform tools; In terms of design management, product data management (PDM) extends to product life cycle and has formed product life cycle management (PLM) technology

with the rapid development of computer-aided technology, remarkable achievements have been made in the performance integrated design, analysis and simulation technology of mechanical products; In recent years, breakthroughs have been made in the research and application of digital prototype technology and many key technologies in the integrated development of product performance. With the development of reliability engineering, there is a strong demand on how to integrate reliability into the process of mechanical product performance integrated design and analysis simulation; At the same time, how to consider multidisciplinary collaborative design analysis and optimization with reliability as the goal in the process of integration has also become the key to improve the reliability of complex systems

reliability design analysis and performance design analysis of mechanical products are closely linked and inseparable. In the past, the traditional mechanical reliability design and analysis based on statistical probability required a large number of test data and product parameters to be collected and analyzed, which must also be carried out in combination with empirical analysis. There is a problem of disconnection between performance and reliability. Moreover, the level of design analysis is often limited to a single component and a single discipline, which is not closely combined with the overall performance of the product. With the development of related disciplines and technologies, such as digital prototype technology, collaborative truth access technology, multidisciplinary optimization technology, etc., it is possible to integrate the performance and reliability of mechanical products, collaborative design, analysis and simulation, and multidisciplinary optimization with reliability as the goal

1 virtual prototype technology

virtual prototype technology is a digital product design method based on simulation model. Using computer simulation and integration technology, the decentralized product development and simulation process are integrated together, and the product prototype is visually designed and optimized, performance tested, manufacturing simulated and used simulated in the virtual environment. The core technology is performance simulation (CAE). For complex engineering objects, it is not competent to rely on only oneortwo kinds of software. It is necessary to build a composite simulation environment composed of a variety of software in order to carry out multi-objective and multi-level performance simulation of the research object. The ultimate goal of virtual prototype is to use the data interface and secondary development technology of simulation tools to create numerical simulation models according to geometric characteristics, realize the sharing and dynamic exchange of analysis data, and try to model once and call many times. In this paper, PDM technology is introduced into the virtual prototype to ensure that the data between the functional modules in the system can flow with high efficiency

2 product data management

product data management (PDM) has a wide range, and it can manage all the data that can eventually be converted into computer description and storage. PDM can be widely used in various industrial fields. However, each field has its own characteristics and needs, and the level requirements and levels of application are different

in the information integration process of product development, PDM system can be regarded as an integration framework. Various applications (such as computer-aided tools (cad/cam/cae), electronic design automation (EDA), office automation (OA), computer-aided process design (CAPP), material requirements planning (MRP), etc.) will be implemented in various ways, such as application interface, development (packaging), etc, It is directly integrated as an object, so that all product data distributed in various places of the enterprise and used (run) in various applications can be highly integrated, coordinated and shared, and all product R & D processes can be highly optimized or reorganized

3 PDM based comprehensive design and analysis platform for mechanical product performance and reliability

in the PDM software framework, various application components are highly integrated. Based on the application background of mechanical product performance and reliability design and simulation, this paper determines the management mode of product data; Establish the organization mode and collaborative environment of virtual prototype integrated simulation team: realize the integration of simulation tools and PDM; The process manager provided by PDM is used to realize the management and coordination of parallel simulation process

the general idea of this platform scheme is reflected in product design, analysis of comprehensive data of product performance and reliability at all levels, process synthesis, feature synthesis and comprehensive trade-off, and closed-loop information at all stages. The relationship between various technical methods in the comprehensive technical system of performance and reliability is shown in Figure 1

Figure 1 functional structure of PDM based comprehensive design and analysis platform for mechanical product performance and reliability

(1) data synthesis of performance and reliability

mainly refers to the synthesis of calculation and analysis data. In the digital environment of mechanical products, it links with the performance design platform and integrates reliability design analysis tools to realize the sharing and integration of performance design data and reliability design data

(2) process synthesis of performance and reliability design analysis

based on system performance design and analysis, combined with the needs of reliability design and analysis, research the collaborative design analysis process around the core work items, and realize the comprehensive design analysis between performance and reliability

(3) characteristic synthesis and trade-off between performance and reliability

performance and reliability are two important components of product system efficiency, and they are also important related factors of product development. This platform takes the efficiency of mechanical product system as the goal, studies the model and trade-off method of multidisciplinary optimization of performance and reliability, and realizes the comprehensive trade-off between performance and reliability

3. 1 reliability design

the basis of reliability collaborative design analysis of mechanical products includes system reliability modeling, failure mode and effect and hazard analysis (FMECA), and fault tree analysis (FTA). System reliability analysis studies the whole mechanical product system, including the prime mover, control device, actuator and other parts, so they are respectively connected as sub modules to the complex system reliability model, analysis and evaluation method under the main module of the experimental program. Failure mode and effect hazard analysis (FMECA) is mainly qualitative analysis. Through analysis, mastering the failure of mechanical products can not only directly guide the mechanism design, but also lay the foundation for further quantitative analysis and Simulation of mechanical product reliability. Fault tree analysis (FTA) can be used for both qualitative and quantitative analysis. Quantitative analysis can further analyze the faults of mechanical products. General fault tree quantitative analysis can be combined with system reliability model

(1) reliability design criteria compliance inspection based on CAD

by building a knowledge base system of mechanical product reliability design criteria in an integrated environment, the reliability information of mechanical product design process can be collected, and the knowledge base can be used for reliability design criteria compliance inspection. Through the inquiry of instance information, it realizes the integration with CAD (such as UG, proe) system, helps to manage the part information of mechanical products in the part design and process design (CAD) system, and uses the knowledge base of reliability design criteria to check the compliance of reliability criteria of part design

(2) probabilistic design of mechanical parts based on CAE

based on three-dimensional digital prototype and finite element model, through data interaction and integrated simulation with CAE software (such as NASTRAN, ANSYS), probabilistic design of mechanical product strength fracture reliability, probabilistic design of mechanical product wear/corrosion reliability, probabilistic design of mechanical product fatigue reliability are realized

3. 2 Reliability Analysis and simulation

(1) fmeca/fta based on CAD

in the process of modern mechanical product design, a large number of computer-aided design software tools are introduced. The more mature ones are Unigraphics, pro/engineering, etc. on the basis of the secondary development of mainstream CAD tools, this module can realize data interaction and collaborative design with CAD software, and integrate fmeca/fta process into the performance design process, So as to realize the reliability design into the product scheme

by building the FMECA fault knowledge base system of mechanical products in the integrated environment and querying the fault engineering information, we can use these fault knowledge to support the optimization of product design and process design, and finally realize the improvement of product design and scheme

this system is used in product design at the same time. According to the part information of mechanical products in the part design system, the fault knowledge in the fault knowledge base is used to analyze the fault of part design, assist the parts to design the performance and requirements that need to be tested, optimize and improve the part design, reduce all kinds of repetition and repetition in product development, and reduce the cost

(2) reliability analysis and Simulation of mechanism motion based on CAE software

on the basis of three-dimensional digital prototype and finite element model, combined with the reliability analysis and Simulation of mechanical strength, through data interaction and automatic integrated simulation with CAE (such as ada-ms, LS DYNA) software, the reliability analysis and Simulation of mechanism motion error accuracy, reliability analysis and Simulation of motion performance of multi rigid body mechanism Reliability analysis and Simulation of kinematic performance of flexible multibody mechanisms

(3) reliability analysis and Simulation of mechanical strength based on CAE software

based on three-dimensional digital prototype and finite element model, combined with mechanism motion reliability analysis and simulation, through data interaction and automatic integrated simulation with CAE (such as nast-ran, ANSYS) software, the static strength reliability analysis and Simulation of mechanical products, dynamic strength reliability analysis and Simulation of mechanical products, and thermal strength reliability analysis and Simulation of mechanical products are completed

(4) mechanical fatigue reliability analysis and simulation based on CAE software

based on three-dimensional digital prototype and finite element model, as well as mechanism motion reliability analysis and simulation and mechanical strength reliability analysis and simulation, through data interaction and automatic integrated simulation with CAE (such as msc. fatigue, fe_safe) software, complete the fatigue/fracture life and reliability analysis and Simulation of mechanical products

(5) reliability optimization analysis and Simulation of mechanical product system

on the basis of comprehensive trade-off optimization design of mechanical product system reliability, combined with virtual prototype of mechanical products, optimization with reliability as the goal, through the combination of probability analysis of mechanical parts and reliability analysis and simulation. Realize data interaction and automatic integrated optimization analysis and simulation

the comprehensive trade-off and optimization of performance and reliability mainly consider the following three aspects:

① determination of the influence trend and strength of trade-off factors. This problem is closely related to the product object. It is proposed to establish a set of analysis and judgment elements according to the product type and comprehensive characteristics, and establish relevant evaluation criteria or rules to assist users in realizing the comprehensive trade-off

② establishment of trade-off evaluation elements and determination of weights, investigation and analysis of relevant achievements at home and abroad, and establishment of evaluation element set and its evaluation criteria or rule requirements according to the object and scope of comprehensive trade-off. use