Yefei Li

FEM-Based Structure Optimization with Grid-Enabled Analysis Environment

This paper presents an application of grid-enabled computing technologies in the field of engineering design optimization using finite element method (FEM). Three essential elements in FEM-based structure optimization problems (CAD modeling, mesh and solution, and optimization) are integrated and automated with grid-enabled computation environment, dataset toolkits which is now being developed collect metadata to build a group level to describe the analysis tasks of the whole engineering problem, it allows access to remote computational resources and executing analysis tasks. A FEM-based optimization is exposed to remote users and is applied to help FEM-based excavator working equipment analysis. A case running in this environment is shown in the end to validate design results

A Design Strategy for Product Development Using Anthropometry

To achieve success in the marketplace, human factors play an important role in product development. In this paper a design strategy considering anthropometric variability for different demographic data was put forward. With the aid of parametric technology of Computed Aided Design (CAD), concept model of products was initialized. Detailed parameters of products were configured according to the anthropometric information based on measurement of customers’. Multiple linear regression were used to model the relation between the product comfort and design variables, thus the sizes of products could adapt to specific customers of certain age, height and gender. A children’s scooter was demonstrated as a case to validate this strategy. A three dimension parametric model of a scooter was built first, the parameters concerned with human factors were determined according to the knowledge of anthropometry.

Research on computer aided design of customized insoles

This paper put forward a framework of computer aided design system of customized insoles. We build a three dimensional model of the foot and insoles via scanning technology. Biomedical parameters were got by pressure distribution system Xsensor and gait analysis system Footscan. Then we get the boundary conditions of customized foot and insoles. The results of design show that the pressure in the customized insoles was reduced compared with which on the former insoles.

Research on structure design of scooter for children based on human factors

Scooter is a small toy which is driven by users feet. Its popular among children at different ages. We should take human factors into account during design process. The sizes of scooter must adapt to those of a certain age group of children. In this paper we put forward a methodology on structure design based on human factors, then we build a three dimensional parametric model of a scooter for ergonomic analysis. The parameters of scooters are determined according to the knowledge of anthropometry.

Effect of Uncertainty on Vibration Analysis of Composite Bicycle Frame

An assessment was put forward to quantify the influence of random material properties uncertainties on vibration analysis of the composite bicycle frame. Youngs modulus, tensile yield strength and density of the composite material were modeled as independent random variables. The effect of material uncertainties on modal analysis and harmonic response analysis were evaluated using the finite element method. The results of this study showed that the vibration analysis, design and optimization of the bicycle frame should be considered with regard to the randomness in composite material properties.

A Knowledge Based CAD/CAE Integrated Multidisciplinary Design System

This paper presents a knowledge based CAD/CAE integrated multidisciplinary design system. The CAD and CAE models of the major parts of products are established with a set of parameters input from the user interface (UI). The knowledge base and inference engine were constructed to determine the parameters. The system contained self developed modules and commercial CAD/CAE software. It automated the design process and eased the capacity of complicated engineering analysis of the designers and reduced the time for computation. A case study on a roof cover in turbine was carried out to verify the feasibility of this system. The results showed that the developed system facilitated the multidisciplinary design.

A Computer Aided Conceptual Evaluation of Excavator Cab Based on Ergonomics

In this study a methodology of computer aided conceptual design in product development based on ergonomics was put forward. When products concerned with people are designed, ergonomics should be taken into account. The digital human model was used to decide the layout of design scheme. Ergonomics features were extracted in workplace analysis. With the aid of software Pro/Engineer, the whole human and machine virtual environment were built. A case of the modeling and size specification of the excavator cab for different drivers was given as the example to show the whole design process. The results shows that the development of ergonomics, computer aided concept design and anthropometry can help the designers to improve product development.

Research on the usability evaluation technology of professional software interface for specific user

Operation of professional software requires the operator mastering knowledge of profession and experiences. In order to reduce the requirements to users, the software interface needs a better human-computer interactive interface. After surveying on the process of interface design of software, evaluation index and common evaluation methods, we design a survey to investigate users satisfaction index when users operate the software. Then analyse reliability and validity of the survey. And finally evaluate the interface usability of a profession software.

A medical aided system for evaluating crura rehabilitation

This paper presents an overview of the current state of development of medical education with a special attention to the fields of rehabilitation. Changes in internet technology provide opportunities for rehabilitation. In this work, we apply medical resources and e-learning service technologies to construct a medical aided learning system. There is summarized philosophy at preparing the e-learning tool, presented achieved results and pointed out some practical hints that should be considering at development of medicine based e-learning modules. Then the paper describes implement of the e-learning system for crura rehabilitation. Medical resources associated with the components of the learning system are encapsulated as reusable Learning agent. Integrated rehabilitation knowledge is used within rehabilitation of disabled people and interns. An example of evaluation of crura rehabilitation is demonstrated. Finally, the paper indicates sketched challenges and ways of future development of e-learning in the presented fields.

Grid environment for fabricating custom artificial human bone

Computer assisted instruction in biomedical engineering (BME) education has been explored and changed dramatically in decades. In this paper we presents a new educational Grid Environment for BME courses. It is designed to be suitable for supporting for the education of medical instrumentation. In emergent situation it helps students to manipulate Rapid Prototyping Machine to fabricate custom artificial human. A rapid prototyping process chain (RPPC), which combines time limits, cost of CT scans, parallelism in computer simulations and bone fabrication, was integrated as workflow in grid service. The grid involves a synthesis of coordinated examinations and large scale, parallel artificial human bones simulations. The portal at students sides need only a thin client and can be accessed by a standard web browser. To illustrate the application of our approach in the grid environment, a femur fabrication case is presented to show its fast and reliable results.