Figure 2 Overall framework of the design quality assurance system in a virtual environment
designing process
The current CAD system provides a powerful part-level detailed design capability. The designer first designs the detailed structure of the part, and then completes the assembly design of the product according to the assembly relationship between the specified parts. This bottom-up design process is not In line with people's design thinking, the design results can not guarantee the function specified by the designer. To this end, the design quality assurance system must support the assembly-level design, the so-called top-down design process. The Design Quality Assurance System (DQAS) we designed is based on this theory, as shown in Figure 3.
The input of the whole system is the user's demand, and the output is the product design result, which is in line with people's design ideas. The whole system is built on the design knowledge base (including geometry library, technology library, function library and management library) and design analysis knowledge base (including feature process library, manufacturability evaluation knowledge base, assembleability evaluation knowledge base and optimization evaluation analysis library). ) on the basis of.
Figure 3 Design process diagram of design quality assurance system in virtual environment
2 Key technologies for design quality assurance in virtual environments
Establishment of virtual design quality assurance environment
According to the interactive nature of virtual reality (VR), it can be divided into different types. Currently, there are three kinds of commonly used, namely desktop virtual reality, virtual reality and enhanced virtual reality. Depending on the design and manufacturing, design quality assurance requires a desktop virtual reality environment that uses a personal computer and workstation to generate simulations in which the designer uses various software for design, evaluation, and simulation. The establishment of the simulation environment is the core content of the desktop virtual environment technology. Because object-oriented simulation breaks through the concept of traditional simulation in theory, its concept of analyzing, designing and implementing the system is very consistent with the natural way of thinking that people understand the objective world, thus enhancing the intuitiveness and comprehensibility of simulation research. Object-oriented simulation is inherently scalable and reusable, providing an extremely convenient means of simulating large-scale, complex systems. In addition, object-oriented simulation is easy to integrate with computer graphics, artificial intelligence/expert systems, and management decision science. Therefore, object-oriented simulation technology provides favorable technical support for the establishment of virtual design quality assurance environment.
Database in virtual design quality assurance environment
The virtual design quality assurance system consists of many different functional modules. Due to the complex structure of the system, the data exchange volume and application frequency are very high. Different functional modules have different data organization and management requirements, and are management virtual design quality assurance systems. A large amount of data in it is necessary to build a database. The object-oriented database formed by the combination of object-oriented technology and database technology can not only provide similar functions to traditional databases, such as persistent storage of data, concurrency control, transaction management, recovery, query, etc., but also provide some suitable for engineering applications. Advanced features and features, such as data abstraction and encapsulation, powerful information modeling capabilities, object representation and combination level polymorphism, scalability, and more. With the gradual improvement and promulgation of the PDES/STEP standard, object-oriented databases supporting PDES/STEP product/process modeling will become an important support for database management in virtual design quality assurance environments. The database under the virtual design quality assurance environment includes two comprehensive libraries: design knowledge base and design analysis knowledge base. The design knowledge base includes geometric library, technical library, function library and management library. The design analysis knowledge base includes feature process library. A manufacturing evaluation knowledge base, an assemblability evaluation knowledge base, and an optimization evaluation analysis library.
Programming and integration of various design analysis software under virtual design quality assurance environment
It can be seen from the framework of the virtual design quality assurance system that the design process includes the design, analysis and simulation process. The whole process requires the support of various design, analysis and simulation software. The various software modules are independent of each other and pass each other. The interface communicates. The current object-oriented programming (OOP) approach decomposes a software system into a series of logical components that represent objects, each of which is a collection of data and processes. Data represents the state of the object, and the process represents the behavior of the object. Only the process owned by the object can access and change its own data. These features help to create a model that is closer to the real world and execute the object-oriented program through the delivery of the message. To change the state of the object. Therefore, the object-oriented programming tool is an ideal tool for programming and integrating various design analysis software under the virtual design quality assurance environment.
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LG Sigma Elevator Spare Parts, LG Elevator Spare Parts, Sigma Elevator Spare Parts
Sigma Elevator Company is a subsidiary of Otis Elevator Korea (OEK) in South Korea for all overseas/export markets. It was founded in 2000.
Starting in 1968, "Goldstar" elevators, and later on, "LG" elevators, were counted among the world's top elevator brands. With the beginning of this new millennium, that legacy lives on through the birth of "SIGMA" elevators.
SIGMA Elevator Company will continue on with its mission of supplying elevators and escalators to more than 50 nations worldwide through its global network of 11 sales companies, 2 offices, and 52 agents or distributors.
SIGMA Elevator Company is dedicated to providing its customers with the best quality products and services. SIGMA elevators feature unmatched safety, ride comfort, and modern design. SIGMA escalators and moving walkways are held to similar safety and comfort standards and are integral parts of our modern urban aesthetics.
Changwon factory, Korea, the main factory of SIGMA Elevator, has long been a well-established name in the global elevator industry. SIGMA`s Dalian factory in China produces elevators & escalators to meet the demands of the local and worldwide markets as well.
SIGMA Elevator Company is committed to increasing customer value through a sharp focus on product innovation and customer satisfaction. With technology developed over the past 30 years, an enduring innovative spirit, and enthusiastic attitude towards providing customer value, Sigma Elevator Company stands by its product and service lines with confidence.
Sigma currently has businesses in more than 75 countries worldwide, and subsidiaries in five countries; Hong Kong (China), Vietnam, Thailand, Malaysia and Singapore.
In the United States, Sigma elevators were distributed by CemcoLift, which was a historic elevator company bought by Otis and based in Hatfield, PA. However, in 2012 CemcoLift has gone bankrupt and replaced by a new company called Minnesota Elevator Solutions.
It's headquarter, factory and testing tower are located in Changwon, South Korea, which are also operated by Otis Elevator Korea. It also has a secondary factory in Dalian, China, opened in 1998 to meet demands on Chinese elevator market.
In 2014, Sigma had a partnership with EXPRESS Elevator Co., Ltd., an elevator company based in Suzhou, China as well as a subsidiary of Otis. In 2016, Express/Sigma opened their headquarters in Suzhou, China
LG Elevators was the elevator and escalator division of LG Electronics. It was acquired by Otis in 1999 and was later known as LG-OTIS Elevator Company.
LG changed its name from GoldStar in 1994 after GoldStar merged with Lucky Chemical. In 1999, it was acquired by Otis Elevator Company, later known as LG-OTIS Elevator Company from 2000 until 2003, when it was renamed to OTIS-LG Elevator Company. Later in 2006, OTIS-LG was again renamed to Otis Elevator Korea.
LG-OTIS Elevator Company (later OTIS-LG Elevator Company then Otis Elevator Korea) was a joint venture company between Otis and LG Electronics` elevator and escalator division, LG Elevators in South Korea. It was formed in 2000. The brand was renamed to OTIS-LG Elevator Company in 2003 and later Otis Elevator Korea in 2006, where it is currently known as that in South Korea
LG Sigma Elevator Spare Parts, LG Elevator Spare Parts, Sigma Elevator Spare Parts
CEP Elevator Products ( China ) Co., Ltd. , https://www.zjsmartcommercialescalators.com