scholarly journals Parametric Modelling of Steel Connectors in a Glulam Based Post and Beam Building System – Towards a Flexible Product Platform Approach

2020 ◽  
Author(s):  
Shamnath Thajudeen ◽  
Martin Lennartsson ◽  
Fredrik Elgh ◽  
Per Johan Persson
Keyword(s):  
Design Process ◽  
Production Efficiency ◽  
Single Case ◽  
Product Platform ◽  
Parametric Modelling ◽  
Building System ◽  
Engineer To Order ◽  
Improved Design ◽  
House Building ◽  
Design And Production

House building projects are distinctive, and the degree of customisation creates bottlenecks in the design process and challenges for production, which results in longer lead time and higher costs. Aligned with a product platform approach, previous studies have introduced cost-effective approaches such as standardisation, modularization, configurators, etc. Still, components that cannot be completely modularized and configured due to high complexity level, may require a lot of engineering efforts during development. A platform approach that can be used to support engineer-to-order products that change over time still needs to be explored. The application of parametric modelling to automate the design process in the construction industry has the potential to further increase both the design and production efficiency. Thus, the objective of this research is to apply parametric modelling in the design of steel connectors used in a glulam based post and beam building system as part of a flexible product platform for increased design and production efficiency. A single case study has been carried out with a Swedish multi-storey house building company. Empirical data were gathered from a workshop with the design team followed by interviews, and document analysis. A computer-supported method for the steel bracket connectors has been developed, that connects post and beam components with pre-defined rules and constraints as part of the platform development. The result contributes to expanding knowledge about the development of a flexible product platform for improved design process and downstream production of customised components with parametric modelling support in the industrial post and beam buildng system.

scholarly journals Supporting the Reuse of Design Assets in ETO-Based Components—A Case Study from an Industrialised Post and Beam Building System

Buildings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 70
Author(s):  
Shamnath Thajudeen ◽  
Fredrik Elgh ◽  
Martin Lennartsson
Keyword(s):  
Parametric Design ◽  
Single Case ◽  
Parametric Modelling ◽  
Building Components ◽  
Building System ◽  
Engineer To Order ◽  
External Efficiency ◽  
House Building ◽  
Modelling Process

The ability to offer customisation has been considered as a competitive advantage for industrialised house building (IHB) companies. Product platform approaches have been acknowledged as one of the prominent ways to improve both internal and external efficiency. However, the use of traditional platform-based strategies does not suffice for the design of engineer-to-order (ETO)-based components in a building system. The purpose of this research is to test and evaluate how the reuse of design assets can be achieved by using a parametric modelling approach to support the design process of ETO-based components in a post and beam building system. This is an additional study using the design platform approach (DPA) that contributes to expanding the knowledge for designing ETO-based components. This research proposes a parametric design platform method developed by following an inductive approach based on the findings from a detailed study on bracket connection with a single case study in a Swedish multi-storey house building company. The proposed method offers flexibility in modelling ETO building components, facilitates design automation, and shows a 20-times improvement in the modelling process. This approach can be used in any building system with ETO-based components by identifying, formalising, and reusing connected design assets. A key finding is that the ETO components can be shifted towards configurable solutions to achieve platform-based design.

scholarly journals Expanding the Building System into a Product Platform for Improved Design and Manufacture – A Case Study in Industrialised House-Building

2020 ◽  
Author(s):  
Shamnath Thajudeen ◽  
Martin Lennartsson ◽  
Fredrik Elgh
Keyword(s):  
Single Case ◽  
Product Platform ◽  
Design Phase ◽  
Structured Interviews ◽  
Design Support ◽  
Effect Analysis ◽  
Building System ◽  
External Efficiency ◽  
Improved Design ◽  
House Building

Industrialised house builders in Sweden have been challenged to meet the demand for housing solutions as the population has increased at a faster rate. As a result, the housing industry is currently faced with objectives to improve productivity and internal efficiency while also controlling the production cost of houses without compromising external efficiency. To remain competitive, many companies developed own building system (BS) based on fixed or partially fixed production systems with different prefabrication techniques. The challenges remain in the design phase and proper methods and tools are required to manage it. In many industries, the product platform approach has been used as a means to achieve both internal and external efficiency. However, little attention has been paid in relating the platform approach to building system support in the design phase of Industrialised house building (IHB). Thus, the main purpose of this paper is to explore the current state of the industrialised house building system and outline design support solutions for the building system from a product platform approach. Qualitative research was conducted by linking a single case company working with post and beam building system in combination with a literature review. Empirical data were gathered from five semi-structured interviews and two workshop sections. A cause-effect analysis has been conducted to realize the potential causes of challenges in the design process. The result illustrates a methodology with principle solutions that can be used as design support for the case company as a path forward and improve further from a product platform perspective.

scholarly journals Improved design criterion for frictionally engaged contacts in overrunning clutches

2021 ◽  
Author(s):  
Nadine Nagler ◽  
Armin Lohrengel
Keyword(s):  
Design Process ◽  
Contact Area ◽  
Axial Load ◽  
State Of The Art ◽  
Tangential Force ◽  
Design Criterion ◽  
Hertzian Contact ◽  
Loss Of Function ◽  
Axial Loads ◽  
Improved Design

AbstractOverrunning clutches, also known as freewheel clutches, are frictionally engaged, directional clutches; they transmit torque depending on the Freewheel clutch rings’ rotation directions. The torque causes a tangential force in the Hertzian contact area. The hitherto “state-of-the-art design criterion” bases on this load situation. In practice, axial loads additionally act on the frictionally engaged Hertzian contact area. This additional axial load can cause the loss of the friction connection and so the freewheel clutch slips. This publication presents an improved design criterion for frictionally engaged contacts in freewheel clutches. It allows to consider tangential as well as axial loads during the design process. Additionally, it offers the possibility to estimate the probability of frictional engagement loss and gross slip based on the freewheel clutch’s application scenario. This publication points out how to use the improved design criterion to design freewheel clutches that are more robust against a loss of function.

The Wireless Sensor System Based on the Chip of STM32 and SH79F32

2014 ◽  
Vol 548-549 ◽  
pp. 744-747
Author(s):  
Chen Jie Qi ◽  
Hong Wei Wang
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Design Process ◽  
Temperature Sensor ◽  
Sensor System ◽  
Wireless Sensor ◽  
Circuit Boards ◽  
Communication Tool ◽  
Wireless Transceiver ◽  
Design And Production

In this thesis, we take STM32F103R8T6 as main chip, SH79F32 as auxiliary chip, the temperature sensor of DS18B20 as collection tools, wireless transceiver based on nRF905 as communication tool, and reach the function of wireless sensor networks. Through Altium Designer Release 10 to conduct schematic design and draw PCB, and then solder circuit boards, use the software of Keil to design process, to realize wireless sensor communication between different microcontrollers, after that ,complete the design and production of wireless sensor communications platforms.

Optioneering of long viaducts via parametric design

2021 ◽  
Author(s):  
Paul M. Sobota
Keyword(s):  
Design Process ◽  
Performance Indicators ◽  
Parametric Design ◽  
Design Stage ◽  
Parametric Modelling ◽  
Parametric Approach ◽  
Early Design Stage ◽  
Main Challenge ◽  
Suitable Approximation

<p><br clear="none"/></p><p>During the optioneering phase, engineers face the challenge of choosing between myriads of possible designs, while, simultaneously, several sorts of constraints have to be considered. We show in a case study of a 380 m long viaduct how parametric modelling can facilitate the design process. The main challenge was to satisfy the constraints imposed by several different stakeholders. In order to identify sustainable, aesthetic, economic as well as structurally efficient options, we assessed several key performance indicators in real time. By automatically estimating steel and concrete volumes, a simple, yet suitable approximation of the embodied carbon (considering 85-95%) can be obtained at a very early design stage. In summary, our parametric approach allowed us to consider a wider range of parameters and to react more flexibly to changing conditions during the project.</p><p><br clear="none"/></p>

The Naval Ship Design/Production Interface

1986 ◽  
Vol 2 (03) ◽  
pp. 185-195
Author(s):  
B. F. Tibbitts ◽  
P. A. Gale
Keyword(s):  
Design Process ◽  
Ship Design ◽  
Design Activity ◽  
Naval Ship ◽  
Current Design ◽  
Design Production ◽  
Design And Production

The paper discusses, from a ship designer's perspective, some of the current topics and issues relating to the interface between naval ship design and production. The current environment within which naval ship design activity is taking place is described. Notable current views on Navy ship design and how it might be improved are summarized. Navy design topics pertinent to improving ship producibility, operability, maintainability and survivability are discussed and examples from recent ship designs are. presented. Issues which result from apparent conflicts in current design initiatives and critiques of the Navy ship design process are highlighted and discussed. Finally, some general conclusions are drawn.

Standardising the Design and Production of Mooring Winches Through More Cohesive Regulations: A Necessary Step

2015 ◽  
Vol 157 (A4) ◽  
pp. 251-262
Keyword(s):  
Design Process ◽  
Mooring System ◽  
Manufacturing Equipment ◽  
Ship Owner ◽  
Technological Advances ◽  
Design And Construction ◽  
Design And Production

"Stricter guidelines, hand in hand with continuous technological advances, mean that vessels are safer and more efficient. At the same time, these changes make ships more complex and expensive. However, this is not the case with mooring equipment. Regulations vary in content, but have the same objective. They fail to improve the ships’ safety and prices are negatively affected. A vessel’s mooring system has to take into account various sets of regulations, including those of the country under whose flag it is sailing; the classification societies; ship owner associations and the terminal ports. This paper will analyse the contents of all these regulations in an attempt to find what they have in common. Its next purpose is to propose guidelines with unified contents. The proposal is to harmonise regulations that affect the mooring winch’s operation, design and construction. With standardised regulations, it would be possible to carry out a single design process and one calculation for components. These steps will be apt for every kind of project. By unifying this process, the final price of manufacturing equipment will be reduced."

Design of a Novel Head Support for People With Hypermobile-Type Ehlers–Danlos Syndrome

2020 ◽  
Vol 3 (4) ◽  
Author(s):  
Robert S. Pierce ◽  
Martin L. Tanaka ◽  
Candace Ireton ◽  
Zachary Church ◽  
David Hudson
Keyword(s):  
Design Process ◽  
Computer Aided Design ◽  
Cord Compression ◽  
Product Development Process ◽  
End User ◽  
Ehlers Danlos Syndrome ◽  
New Device ◽  
Improved Design ◽  
Future Work ◽  
Danlos Syndrome

Abstract Hypermobile-type Ehlers–Danlos Syndrome (hEDS) is characterized by connective tissue laxity resulting in excessive joint mobility. This can lead to instability of the cervical spine resulting in spinal cord compression and neck pain. People with hEDS often utilize commercially available cervical collars to provide head support, but these devices are not well-suited for this population. This work describes the development of a novel head support designed specifically to meet the needs of people with hEDS. The head support was developed using the principles of human-centered design, in which the end user is an active participant in the design process. People with hEDS were interviewed to identify limitations of existing support devices and desirable features of a new device. Input from the interviews was combined with structured design methods to generate initial designs. A prototype of a selected initial design was developed and evaluated by a person with hEDS. Feedback from this evaluation was incorporated into a second-generation design. This improved design stabilizes and supports the head while flexing to allow limited motion. It has an open, well-ventilated structure, and can be worn under clothes. By including end users in the design process, making effective use of computer-aided design and additive manufacturing processes, and gaining feedback through rapid prototyping, the product development process has been accelerated and focused on the needs of the end-user. Future work will continue to include people with hEDS as part of the design team to develop a high-functioning, affordable head support.

A Digital Twin-Driven Improved Design Approach of Drawing Bench for Brazing Material

2019 ◽  
Author(s):  
Bingtao Hu ◽  
Yixiong Feng ◽  
Yicong Gao ◽  
Hao Zheng ◽  
Jianrong Tan
Keyword(s):  
Production Efficiency ◽  
Optimal Parameter ◽  
Design Approach ◽  
Structural Parameter ◽  
Analytic Hierarchy ◽  
Digital Twin ◽  
Twin Model ◽  
Full Life Cycle ◽  
Improved Design ◽  
Uniform Diameter

Abstract Brazing materials can be made into different shapes to meet the requirements of different scenarios and the welding rod is a very common form. The rough-processed welding rods must be properly finished by the drawing bench to remove the oxide film on the surface and made into a uniform diameter. However, the continuous welding rod often breaks resulting low production efficiency. To reduce the frequency of workers’ reconnection operation of broken welding rods, we proposed a digital twin-based approach to improve the design of the structure of the drawing bench. First, we established a full life cycle digital twin model for the welding rod from the formulation stage to the finishing stage. The product ontology of the welding rod was built and the key process parameters were collected. Second, based on the product ontology, the key structural parameter of the drawing bench that affects the internal stress of the welding rod was determined by means of analytic hierarchy process. Third, we modified the key structural parameter in the digital twin model and simulated the finishing process. A near-optimal parameter was found. Last, we improved the structure of the actual drawing bench accordingly and carried out some experiments. The results matched well with the simulation prediction and the frequency of welding rod breaking is significantly reduced, which proved the effectiveness of our proposed improved design approach.

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