Conceptual Design of a Positively Engaged Continuously Variable Transmission

2008 ◽  
Author(s):  
Ryan R. Dalling ◽  
B. Levi Haupt ◽  
Robert H. Todd
Keyword(s):  
Product Development ◽  
Conceptual Design ◽  
Continuously Variable Transmission ◽  
Operating Conditions ◽  
Product Development Process ◽  
Design Phase ◽  
Concept Generation ◽  
Conceptual Design Phase ◽  
Concept Evaluation ◽  
Variable Transmission

Previous research and publications at Brigham Young University have established the new positive engagement continuously variable transmission (PECVT) family of continuously variable transmissions (CVTs). Various embodiments of PECVTs have been identified and surveyed; resulting in the identification of the behavior termed the non-integer tooth problem. Additional research has been conducted to further explore the non-integer tooth problem and identify a feasible solution to the problem through the use of a product development method. This publication will address the conceptual design phase of the product development process for a PECVT. This will include: the identification of the operating conditions of a PECVT, i.e. further detail of the non-integer tooth problem, identification of required characteristics for a solution, design specifications, concept generation, concept evaluation, and concept selection. The conceptual design phase will result in a conceptual solution which will satisfy the identified characteristic requirement and designs specifications.

scholarly journals A Product Development Approach in The Field of Micro-Assembly with Emphasis on Conceptual Design

2019 ◽  
Vol 9 (9) ◽  
pp. 1920 ◽  
Author(s):  
Christoph Gielisch ◽  
Karl-Peter Fritz ◽  
Anika Noack ◽  
André Zimmermann
Keyword(s):  
Product Development ◽  
Conceptual Design ◽  
Manufacturing Systems ◽  
Development Process ◽  
Product Development Process ◽  
Reconfigurable Manufacturing Systems ◽  
Design Phase ◽  
Reconfigurable Manufacturing ◽  
Micro Assembly ◽  
Conceptual Design Phase

Faster product lifecycles make long-term investments in machines for micro assembly riskier. Therefore, reconfigurable manufacturing systems gain more and more attention. But most companies are uncertain if a reconfigurable manufacturing system can fulfill their needs and justify the initial investment. New and improved techniques for product development have the potential to foster the utilization and decrease the investment risk for such systems. In this paper, four different methods for product development are reviewed. A set of criteria regarding micro assembly on reconfigurable manufacturing systems RMS is established. Based on those criteria and the assessment, a novel approach for a product development method is provided, which tries to combine the strengths of the beforehand presented approaches. It focuses on the conceptual design phase to overcome the customers’ uncertainty in the development process. For this, an abstract representation of a micro-assembly product idea as well as a decision tree for joining processes are established and validated by real product ideas using expert interviews. The validation shows that the conceptual design phase can be used as a useful tool in the product development process in the field of micro assembly.

scholarly journals An Immersive VR Application for Interactive Product Concept Generation and Qualitative Evaluation

2009 ◽  
Author(s):  
Christian Noon ◽  
Ruqin Zhang ◽  
Eliot Winer ◽  
Jim Oliver ◽  
Brian Gilmore ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Computer Aided Design ◽  
Systems Design ◽  
Qualitative Evaluation ◽  
Assessment Tools ◽  
Design Phase ◽  
Concept Generation ◽  
Early Assessment ◽  
Element Analysis ◽  
Conceptual Design Phase

Currently, new product concepts are evaluated by developing detailed virtual models with Computer Aided Design (CAD) tools followed by evaluation analyses (e.g., finite element analysis, computational fluid dynamics, etc.). Due to the complexity of these evaluation methods, it is generally not possible to model and analyze each of the ideas generated throughout the conceptual design phase of the design process. Thus, promising ideas may be eliminated based solely on insufficient time to model and assess them. Additionally, the analysis performed is usually of much higher detail than needed for such early assessment. By eliminating the time-consuming CAD complexity, engineers could spend more time evaluating additional concepts. To address these issues, a software framework, the Advanced Systems Design Suite (ASDS), was created. The ASDS incorporates a PC user interface with an immersive virtual reality (VR) environment to ease the creation and assessment of conceptual design prototypes individually or collaboratively in a VR environment. Assessment tools incorporate metamodeling approximations and immersive visualization to evaluate the validity of each concept. In this paper, the ASDS framework and interface along with specifically designed immersive VR assessment tools such as state saving, dynamic viewpoint creation, and animation playback are presented alongside a test case example of redesigning a Boeing 777 in the conceptual design phase.

A New Analytical Model of a Centrifugal Compressor and Validation by Experiments

2010 ◽  
Vol 26 (1) ◽  
pp. 37-45 ◽  
Author(s):  
H. Pourfarzaneh ◽  
A. Hajilouy-Benisi ◽  
M. Farshchi
Keyword(s):  
Conceptual Design ◽  
Centrifugal Compressor ◽  
Experimental Studies ◽  
Design Tool ◽  
Operating Conditions ◽  
Experimental Results ◽  
Design Phase ◽  
Robust Model ◽  
Conceptual Design Phase ◽  
Wide Range

AbstractIn the conceptual design phase of a turbocharger, where emphasis is mainly on parametric studies, before manufacturing and tests, a generalized and robust model that implies over a wide range properly, is unavoidable. The critical inputs such as compressor maps are not available during the conceptual design phase. Hence, generalized compressor models use alternate methods that work without any supplementary tests and can operate on wide range. One of the common and applicable modeling methods in design process is the ‘Dimensionless Modeling’ using the constant coefficient scaling (CCS). This method almost can predict the compressor characteristics at design point. However, at off design conditions, error goes up as mass flow and speed parameters increase. Therefore, the results are not reliable at these points. In this paper, a variable coefficient scaling (VCS) method is described. Then, a centrifugal compressor is modeled using the VCS method. To evaluate the model and compare it with the experimental results, some supplementary experiments are performed. Experimental studies are carried out on the compressor of a S2B model of the Schwitzer turbocharger in the turbocharger Lab., at Sharif University of Technology. The comparison between the experimental results and those obtained by the VCS method indicates a good agreement. It also suggests that the present model can be used as an effective design tool for all operating conditions.

The Part Count Tool (PACT) for Concept Selection

2009 ◽  
Author(s):  
Tarang Parashar ◽  
Katie Grantham Lough ◽  
Robert B. Stone
Keyword(s):  
Conceptual Design ◽  
Manufacturing Cost ◽  
Design Phase ◽  
Concept Generation ◽  
Product Concept ◽  
Design Concepts ◽  
Conceptual Design Phase ◽  
New Concepts ◽  
Component Type ◽  
The Cost

This paper presents a part count tool that automates the consideration of manufacturing cost during the conceptual design phase by predicting part count for a particular product concept. With an approximate number of parts per product in the conceptual design phase, the designer can estimate the cost associated with the product. On the basis of the cost, the designer can make changes according to budget requirements. The part count tool will also aid in ranking the design concepts by number of components for a product. This tool utilizes existing automated concept generation algorithms to generate the design concepts. It extracts the available data from the Missouri S&T Design Repository to compute an average number of parts per component type in the repository and then calculates an average part count for new concepts. This data can subsequently be used by designers to estimate product cost. The part count tool also uses an algorithm to determine how to connect two non compatible components through the addition of mutually compatible components. While emphasis is placed on the average parts per product in evaluating designs, the overall functional requirement of the product is also considered.

scholarly journals Application of Noise Certification Regulations within Conceptual Aircraft Design

Aerospace ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 210
Author(s):  
Michel Nöding ◽  
Lothar Bertsch
Keyword(s):  
Conceptual Design ◽  
Aircraft Design ◽  
Low Noise ◽  
Operating Conditions ◽  
Published Data ◽  
Design Phase ◽  
Simulation Process ◽  
Research Activities ◽  
Conceptual Design Phase ◽  
Conceptual Aircraft Design

ICAO Annex 16 regulations are used to certify the acoustic performance of subsonic transport aircraft. Each aircraft is classified according to the measured EPNL levels at specific certification locations along the approach and departure. By simulating this certification process, it becomes possible to identify all relevant parameters and assess promising measures to reduce the noise certification levels in compliance with the underlying ICAO regulations, i.e., allowable operating conditions of the aircraft. Furthermore, simulation is the only way to enable an assessment of novel technology and non-existing vehicle concepts, which is the main motivation behind the presented research activities. Consequently, the ICAO Annex 16 regulations are integrated into an existing noise simulation framework at DLR, and the virtual noise certification of novel aircraft concepts is realized at the conceptual design phase. The predicted certification levels can be directly selected as design objectives in order to realize an advantageous ICAO noise category for a new aircraft design, i.e., simultaneously accounting for the design and the resulting flight performance. A detailed assessment and identification of operational limits and allowable flight procedures for each conceptual aircraft design under consideration is enabled. Sensitivity studies can be performed for the relevant input parameters that influence the predicted noise certification levels. Specific noise sources with a dominating impact on the certification noise levels can be identified, and promising additional low-noise measures can be applied within the conceptual design phase. The overall simulation process is applied to existing vehicles in order to assess the validity of the simulation resultsfcompared to published data. Thereafter, the process is applied to some DLR low-noise aircraft concepts to evaluate their noise certification levels. These results can then be compared to other standard noise metrics that are typically applied in order to describe aircraft noise, e.g., SEL isocontour areas. It can be demonstrated that certain technologies can significantly reduce the noise impact along most of an approach or departure flight track but have only a limited influence on the noise certification levels and vice versa. Finally, an outlook of the ongoing developments is provided, in order to apply the new simulation process to supersonic aircraft. Newly proposed regulations for such concepts are implemented into the process in order to evaluate these new regulations and enable direct comparison with existing regulations.

Applying Function-Based Failure Propagation in Conceptual Design

2007 ◽  
Author(s):  
Daniel Krus ◽  
Katie Grantham Lough
Keyword(s):  
Risk Analysis ◽  
Product Design ◽  
Conceptual Design ◽  
Functional Model ◽  
Thermal Control ◽  
Design Phase ◽  
Historical Knowledge ◽  
Conceptual Design Phase ◽  
Failure Propagation ◽  
Potential Risks

When designing a product, the earlier the potential risks can be identified, the more costs can be saved, as it is easier to modify a design in its early stages. Several methods exist to analyze the risk in a system, but all require a mature design. However, by applying the concept of “common interfaces” to a functional model and utilizing a historical knowledge base, it is possible to analyze chains of failures during the conceptual phase of product design. This paper presents a method based on these “common interfaces” to be used in conjunction with other methods such as Risk in Early Design in order to allow a more complete risk analysis during the conceptual design phase. Finally, application of this method is demonstrated in a design setting by applying it to a thermal control subsystem.

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