Improve Design Quality Research Articles

Parametrical Finite Element Modeling of Overhead Transmission Line-Towers System

With large-scale development of ultra high-transmission network, the structure of transmission line-towers system tends to the tower higher, the cross-section of transmission lines larger and span between towers longer. As the increasing of transmission lines voltage grade, transmission line-towers system has higher requirements on static and dynamic stability. It is difficult for traditional design method to meet the demands of new transmission line-towers, not to mention shorten the design cycle, improve design quality. In this paper, we establish overhead transmission line-towers system model based on parameterized finite element method, by gradually increasing the thickness of the icing, iced load, wind load, weight, mechanical properties under the action of the load and the conductor tension. The analysis results show that the model can effectively reflect the mechanical properties of the transmission towers, and improve the quality of the design, greatly shortening the design cycle.

A Study on the Development Direction and Priority of the BIM-Based Hospital Design Validation Technology

Hospital design review is challenging because design requirements for hospitals are more complex than other facilities, and many design changes occur due to changes of medical device specifications during a construction period and request from experts in various fields. Building Information Modeling (BIM) has recently been adopted in a hospital design process to improve design quality and reduce design errors. A possibility of automated check of hospital design using BIM has been demonstrated. However, the current use of BIM is too limited to satisfy the needs of practice. The main goals of this study are to survey the needs for the BIM-based hospital design validation technology and to propose the development direction and priority through a survey with experts and professionals in hospital design and construction. As the results, among various hospital-related design codes and guidelines, practitioners perceived that design change orders during a construction process and an overwhelming amount of design requirements were the most important and most repeatedly examined items. When BIM-based design validation was adopted, the central medical department, wards, and the outpatient department were regarded as the most beneficial spaces, clash detection between architectural and mechanical, electrical, and plumbing (MEP) components as the most beneficial work type, and the design development phase as the most beneficial phase. The development priority and direction of a BIM-based hospital design validation technology found in this study are expected to be used as a blueprint for developing and improving BIM-based hospital design validation systems in the future.

Three-Dimensional Design and Analysis of Multi-Spindle Drilling Device

Design and analysis of multi-spindle transmission device helps to improve design quality and efficiency of aggregated machine tools and other automatic mechanical devices. This paper analyzed principles and structures of two multi-spindle transmission mechanisms adopted extensively in mechanical area. A three-dimensional prototype of the multi-spindle drilling device designed for machining six holes simultaneously was built with Pro/Engineer software. The device adopted multi-spindle reciprocating transmission mechanism. The application of the software involved creating simplified model used for motion analysis, performing kinematic analysis of the mechanism, establishing measures of main parameters and executing optimal design of key parts.

3D Modeling and Motion Simulation of Mine Skip Getting through Dump Rail Based on Pro/E

3D modeling, virtual assembly and motion simulation of an up-open fan gate mine skip were completed with Pro/Engineer software. During virtual design, faults of a mine skip such as static and dynamic interference can be found out prior to be made, which is helpful to optimize it. Furthermore, it is effective to shorten design period of mine skip and save development cost and improve design quality.

Knowledge-Based System for Supporting the Design of a Plate-Press

This paper presents a knowledge-based system capable of giving the designer quality support when making decisions from the aspect of modeling the reinforcement of a plate-press within a position of maximum compressive load, and by choosing suitable material for the plate. Based on the selected combination of reinforcement and material, this system acquaints the user with the size and position of the largest comparative stress, and the greatest nodal displacement in the load-direction. This system operates based on the implemented knowledge of experts in the execution of design, material selection, and numerical analysis based on the finite-element method (FEM), which was written with the help of parameters within the knowledge-base of the CATIA V5 CAD-system. Using this system gives the user an opportunity to reach conclusions that are crucial for designing a plate-press or pressure-loaded die-elements, in general. The results reveal that the system can dramatically shorten design time and improve design quality in comparison to manual design process.

The Research on Architecture Design Engineering Method Based on Computer Virtual Reality Technology

Also known as virtual reality or virtual reality environments virtual environment, is rapidly developing a comprehensive computer and interactive graphics technology, which integrates computer graphics, multimedia, artificial intelligence, multi-sensor, network parallel processing, the use of computer-generated three-dimensional space image synthesis technology to achieve the goal, through visual, hearing, touch, in order to render the graphics and animation, the viewer, "seeing is bright." Virtual reality technology is an integrated building design approach, designed to reduce labor intensity, shorten the design cycle, improve design quality, saving investment. Designers to design the building and engineering units can communicate with each other on the World Wide Web.

Hardware Behavioural Modelling, Verification and Synthesis with UML 2.x Activity Diagrams

Modelling of hardware behavior is the fundamental process of hardware design project. Possible specification techniques, like UML 2.x Activity Diagrams or Control Interpreted Petri Nets, all have its advantages and disadvantages. Combing the accessibility of UML and full support for formal verification of Petri nets may significantly improve design quality. The article propose a system supporting logic controllers development, starting from a specification, going through formal verification (including model checking), and ending with synthesis.

Research on Modeling of Screw Pump Characteristic Mathematical Model

For the design and management of the modern heavy oil piplines, the application of mathematical model to describe the characteristics of screw pump is crucial to the improvement of design quality and operational management efficiency. According to the features of HOW7T.3(50mm) screw pump’s actual measured data, this research established two groups of mathematical model.The first one described the change of screw pump’s displacement along with the variation of pressure difference and viscosity, while the second group described the change of shaft power along with the variation of pressure difference and viscosity, and then it solved all the four models by a particle swarm optimization (PSO) algorithm. The model-building and model-solving of these two examples showed that the PSO algorithm could rapidly search the best model regression parameter. Through the four target test, the research finally selected two models with relatively high accuracy. In the end, the paper put forward that it is necessary to take further research on the forms of screw pump characteristic mathematical model, and the corresponding optimization method of model-solving, in order to make the models more succinct and with higher fitting precision.

Review of preventative behavioural interventions for dermal and respiratory hazards

No previous systematic review of the evidence base has been undertaken to help occupational health professionals understand how to reliably lower the instance of occupational ill-health through reducing risk-taking behaviour. To evaluate the effectiveness and processes of occupational-based behavioural interventions for workers exposed to dermal and respiratory hazards. A systematic review was conducted. Sixteen electronic databases were searched using key words. Bibliography, health and safety websites and hand searches of key journals were also undertaken. Articles were included if they evaluated an intervention targeting workers' behavioural compliance, addressed dermal or respiratory hazards, used before and after measures with a control group comparison and used behaviour-related exposure indicators such as airborne exposure, health effects, behaviour observations and self-reported work practices. Data were extracted according to potential sources of bias, impact and behavioural change processes used. Ten of 550 articles identified as potentially relevant were included. A predominance of small effect sizes, particularly for larger samples, demonstrated limited but positive impact upon exposure. Studies contained too much heterogeneity for reliable meta-analysis. None of the studies covered the full range of behaviour change components necessary for reducing exposure risk. We conclude that future interventions could enhance their effectiveness through improving design quality, reporting and basing their content upon evidence-based behavioural change approaches. Using a comprehensive range of evidence-informed behaviour change ingredients should improve occupational health professional's ability to reliably reduce occupational ill-health where exposure cannot totally be designed out of the workplace.

Application of Virtual Prototype Technology in Designing Special Electromechanical Device

Adopting computer technology for building virtual prototype model of special electromechanical device. After analysis and evaluation for structural form of that device, we find out the means and measures of optimization design. Take the advantage of that virtual prototype don’t limited by virtual experiment test length like physical prototype, there is no need for manufacturing and testing the physical prototype and we can acquire optimum design plan. To sum, we choose virtual prototype model in design electromechanical device can shorten the period of study and development electromechanical product effectively and improve design quality of electromechanical product conspicuously.

Simulation Analysis to Shock Strength of Electromechanical Products Using MSC.PATRAN and MSC.DYTRAN

The traditional method of verifying mechanical and electrical products shock strength is primarily through impact test to the product. From the current experiment the force size and amount of structural deformation can’t be gotten when it suffers from the impact load. Applying the software of MSC.Patran and MSC.Dytran, finite element is modeled for the mechanical and electrical products components, and impact property is analyzed when they are subject to impact load. It can reduce the number of verification test and improve design quality. The application is very promising.

Application of 3D Bridge Information Modeling to Design and Construction of Bridges

Building information modeling (BIM) is a new technology in bridge construction industry. 3D models can provide perfect numerical expression of drawings from design results. 3D information models for bridge structures improve design quality in terms of accurate drawings, constructability and collaboration. However, there are lots of obstacles to apply these techniques to actual bridge projects. In this paper, extensible information schema for bridges is proposed to enable interoperability between different design and construction processes. From the planning stage of a bridge construction project to the construction stage, the proposed bridge information models were applied to enhance current practices. Digital mock-up, parametric modeling, 4D and 5D simulation were conducted. From several applications for four years, a design guideline of 3D information models was suggested. It is essential to change current processes for the effective use of BIM techniques in bridge construction industry.

RESEARCH ON A NEW HARDNESS TESTING DEVICE BASED ON VIRTUAL DESIGN

Structure optimization of Hardness Testing Device (HTD) based on virtual design is proposed here. The purpose of the HTD is to obtain hardness properties of accessories. Since the creation of the previous HTD, a few problems have been experienced during testing. In the present work, improvements in both equipment design and automation control have been made. A realistic digital analysis is generated by combining automated and interactive approaches to evaluate the capability of the device with simulation software ADAMS and AMESim. Theoretical analysis is taken into account to obtain numerical results close to reality. The approach and the conclusions should be useful for composite structures design. The improved design of HTD reduces the number of costly physical prototypes, improves design quality and reduces product development time.

Application of Parallel Indexing Cam Design Software Platform in Intermittent Mechanism Designing of Die-Cutting Machine

The formation of parallel indexing cam profile was described in detail with the calculation of the cam profile data. With VB as the software platform, the parallel indexing cam contour was calculated, the contour mapping was also displayed, and the data was saved as required format. Then a three-dimensional entity of the parallel indexing cam mechanism is drawn up directly in SolidWorks in order to perform the 3D parameterization design and motion emulation of the parallel indexing cam mechanism. This can help designers to find the problems, such as the rotation difficulties caused by excessive pressure angle, the motion distortion caused by small radius of curvature. So the designer can make modification in time to improve design quality and shorten the product development cycles. The software platform can select type of the interval splitter by calculating and selecting the power motor according to the input drive shaft angle and the output shaft such shares. The system could perform the transmission of information and share the information between subsystems, enhancing the degree of integration and automation of parallel indexing cam design and manufacture. A good software platform was developed for parallel indexing cam mechanism’s design, manufacturing and performance studying. Finally, the example of interval paper-feed mechanism in an automatic die-cutting machine was verified the usability and effectiveness of the software platform.

Performance Analysis of Large Radial Equal-Thickness Vibratory Feeder

The radial equal-thickness feeder in the paper is designed for the rotary hearth furnace and achieves radial equal-thickness distributing for material. Vibratory feeder is a complex elastomer. Dynamic analysis is an important part for the large radial equal-thickness vibratory feeder. In order to attain the vibration characteristics of the basis and the screen body, such as amplitude, frequency, vibration locus, vibrating direction angle, and improve design quality, so the vibration feeder is tested and analyzed. Dynamic response parameters of large radial equal-thickness vibratory feeder are tested in field and the data in different time are collected by software DH5920. Material transportation speed and throughput are derived. The real average velocity is νmmax=0.054m/s, the real throughput is Q=3600hBνγ=25.19t/h. The results showed that the feeder can meet the production process requirements.

Coordination for replicated collaborative feature modeling

Collaborative feature modeling has been proposed and applied in product design for improving design quality and shortening lead-time. The coordination mechanism for scheduling the collaborative design activities has been a topic of significant research effort. Total-locking mechanism and granular locking mechanism have been reported. However, these granular locking mechanisms have some limitations. Although the designers can edit different parts of a feature model at the same time, there are some conflicts due to feature interactions. Besides, in order to maintain consistency of the replicated design models, the order of execution of the ‘feature create operations’ must be kept consistent at the client sites. In this research, a fine granular locking mechanism is proposed for a replicated collaboration system. The locking granularity is defined according to feature relationships, and the potential operation conflicts are resolved using a naming and matching mechanism. In the proposed approach, a design model can be divided into several feature portions, thus a parallel working paradigm can be achieved. The ‘feature create operation’ is processed differently from the ‘feature modify operation’ so as to maintain consistency of the order of the features created. The limitation of this approach is that the effectiveness depends on the parent–child relations of the features. The proposed coordination approach has been validated in a proof-of-concept prototype system developed based on Java and Open CASCADE.

The integration of HAZOP expert system and piping and instrumentation diagrams

The main purpose of hazard and operability (HAZOP) analysis is to identify the potential hazards in the process design which nowadays is generally developed through a computer aided design (CAD) package. Due to the time and effort consuming nature of HAZOP, it is not done in every engineering firm for every design project. To make HAZOP an integral part of process design, an integration framework is proposed in this paper to seamlessly integrate the commercial process design package Smart Plant P&ID (SPPID, Intergraph) with one of the HAZOP expert systems (named as LDGHAZOP) developed by authors. This integration makes it possible to perform HAZOP analysis easily at anytime of the whole lifecycle of a chemical plant as long as the process design is available, which might help the improvement of design quality. One industrial case study is used to illustrate the ability of the integrated system.

The Design Method of Punches and Dies for Progressive Die of Motor Core Based on Association Design Technology

This paper describes a structural design tool for punches and dies in 3D progressive dies of motor core based on association design technology. Based on the classification and 3D modeling method of punches and dies, the associated model is set up to describe the holes on plates of die set for punches and dies. The proposed tool integrates the design knowledge of progressive dies for motor core to automate the design for punches, dies and corresponding holes on plates. This design tool is constructed on a PC and integrated with SolidWorks software. We use progressive die for the motor core with rotator, stator and vice-stator as a concrete example to demonstrate the power of the design tool. The results show that it can not only improve design quality but also save both time and costs dramatically.

Performance Prediction and Design Method for Centrifugal Pump Based on Computational Fluid Dynamics

Using Reynolds average N-S equations closed by standard k- turbulence model, the steady and unsteady turbulent flow in centrifugal pump was simulated by using MRF model and SM model respectively. A method for predicting the performances of centrifugal pump was built on the basis of computational fluid dynamics. By the presented performance prediction method, not only the flow characteristics of centrifugal pump can be obtained, but also can its performances be evaluated quantitatively and qualitatively. The advantages and disadvantages of some traditional design methods for centrifugal pump were analyzed. On the basis of performance prediction and flow analysis, a new design method was put forward in consideration of the steady and unsteady performances of centrifugal pump. The proposed method can be used to design the centrifugal pump with high running stability, efficiency and cavitation resistance, and it is available for shortening development period and improving design quality of pump.

Post-Occupancy Evaluation and Design Quality in Brazil: Concepts, Approaches and an Example of Application

This article aims to describe the origins and evolution of post-occupancy evaluation (POE) activities in Brazil. This methodology was consolidated in the Brazilian academic field in the mid-1990s. Whenever possible, parallels between activities carried out in this country and abroad are pointed out. Emphasis is given to the possibility of using POE to improve design quality, especially in architecture, and its use in the management of designing processes. In this sense, the article shows the benefits of POE studies applied in different types of occupancies. Specifically, a case study of school building is presented. Finally, a number of conclusions are drawn regarding prognoses as to the limits of its use in the professional practice of architects, urban planners and designers. The POE's potential to provide feedback for positive design practices, benchmarks, and for updating building codes and standards is also discussed.