Parametric design approach on high-order and multi-segment modified elliptical helical gears based on virtual gear shaping

Aimed at the complexity of non-circular gears design and manufacturing process, according to the principles of gear connection, the pitch curve mathematical model of high-order elliptical gears is established. The pitch curve meshing characteristic and transmission ratio of high-order elliptical gears is calculated and analyzed using MATLAB software. Based on the converting tooth profile method, the gear tooth profile parameterized design, CAD graphics drawing, three-dimensional modeling, machining simulation and CNC programming of high order elliptical gears are studied with CAXA software. The processing experiments using CNC wire-cut machine prove the validity and practicability of the method. This electronic document is a "live" template. The various components of your paper [title, text, heads, etc.] are already defined on the style sheet, as illustrated by the portions given in this document.

Parametric control systems design approaches possess the advantage of providing all the degree of freedom in the system design and are very effective in dealing with multiple objective design. To facilitate the parametric control design for hypersonic vehicles (HVs), this paper derive the parametric control-oriented models for a general nonlinear longitudinal dynamical model of HVs. The force and moment coefficients in the original model are assumed to have some generalized forms. Both first-order quasi-linear model and matrix second-order nonlinear model have been developed without involving linearization in certain operating points, and the obtained results allow for direct application of parametric control design approach.

Taking the Syrian city of Homs as its point of departure, this paper aims to suggest some first components of a parametric urban design approach to post-conflict reconstruction focused on scenario building. From analyses of social, physical and environmental infrastructures and theoretical positions on environmentally and socially sustainable urban design in the Middle Eastern culture and climate, a framework and some initial tests for a parametric 3D urban model developed in CityEngine are presented. With the intended purpose of providing a tool capable of visualising modifiable urban design scenarios along with relevant associated data, the presented work focuses on the smallest scale of a model encompassing scales from the district level to the level of the urban block, with some relevant architectural features relating to social and environmental qualities.

The effect on dynamics of using a new transmission design for eccentric speed reducers

A non-circular planetary gears train beating-up mechanism was proposed, the ideal kinematic curve of beating-up rockshaft was constructed and the reverse model of the pitch curve of non-circular gears was established based on the ideal kinematic curve. When the first-level non-circular gears were set as elliptical gears, the maximum swinging angle of the sley and the influence of the elliptical gears' eccentricity on the concavo-convex characteristic of the second-level non-circular gears were analyzed. Provided with a set of parameters, the pitch curves and tooth profiles of the second-level non-circular gears were determined by reverse method. The result has shown that non-circular planetary gears train beating-up mechanism can meet the requirements of beating-up process.

Flow fluctuation abatement of high-order elliptical gear pump by external noncircular gear drive

This study focused on the ultimate tensile strength (UTS) maximization of solid state joining process i.e. friction stir welding (FSW) by using vertical milling machine on AA 6082-T6. In order to evaluate the effect of process parameters such as tool rotational speed, traverse speed and tool pin length on ultimate tensile strength of friction stir welded aluminum alloy 6082-T6, Taguchi parametric design and optimization approach was used. Through the Taguchi parametric design approach, the optimum levels of process parameters were determined. The results indicate that the rotational speed and welding speed are the significant parameters in deciding the tensile strength of the joint and the tool pin length is the least significant parameter in deciding the tensile strength of the joint.

Bu makalede iç ve dış dişlilerdeki girişimi belirleyen analitik yaklaşımlar araştırılmaktadır. Dış helisel dişliler için fonksiyonel ve imalat tipi girişimler dikkate alınmaktadır. İç düz dişliler için evolvent ve takılma girişimleri ele alınmıştır. Girişim limitleri için literatürde bulunan denklemler incelenmiştir. Ayrıca iç düz dişliler için evolvent girişimi profil kaydırma ile önlemek için bir denklem önerilmiştir. Tasarım parametrelerinin etkisini araştırmak için hem kremayer tipi hem de pinyon tipi dişli imalatı için bilgisayar programları geliştirilmiştir. Geliştirilen programlara dayalı olarak sayısal örnekler verilmiştir. Bu çalışma dişli tasarım sürecinin ilk aşamalarında girişim olup olmadığını belirlemek için kullanılabilir.

The internal gear grinding machine, ZI20A is the first of its kind that is applicable for mass production of internal gears. It is suitable for grinding planetary gears, heat-treated internal or external gears at high speeds with high accuracy. One of the features of this machine is its ability to grind stepped workpieces. In case of stepped workpieces, it is difficult to determine the axial stroke required to achieve proper grinding of the entire tooth surface without causing any interference of the stepped region with the machine parts or grinding wheel. During the grinding test of such workpieces, sometimes the tooth flank remains unground at the ends due to inadequate axial stroke. A new simulation tool has been developed to visualize and analyse the internal gear grinding process. Using this simulation tool, the axial stroke required for grinding can be estimated without performing actual grinding tests.

Intelligent optimal design of floor tiles: A goal-oriented approach based on BIM and parametric design platform

This paper proposes a meta-model-based parametric Historic Building Information Modelling (HBIM) approach to preserving and renewing traditional timber dwellings, specifically focusing on traditional Bai ethnic residential architecture. The study integrates traditional architectural principles with contemporary digital construction techniques. Traditional Bai dwellings have complex timber structural and spatial characteristics with various components. Results from the application of HBIM demonstrate improved efficiency in documenting and managing structural information, facilitating the maintenance and preservation of heritage buildings. The study concludes that HBIM, supported by parametric and generative design approaches, offers significant advantages in the digital preservation of architectural heritage. This approach not only ensures the structural integrity and historical accuracy of the models but also provides a scalable solution for managing and preserving traditional dwellings in the face of modernization pressures. This research broadens the scope of parametric design within digital construction theory, particularly concerning ancient timber structures. It offers a crucial framework that can inform both future studies and practical efforts in the preservation of heritage buildings.

This paper reports on an industry-academia collaboration for integrating construction and engineering analyses into a graduate-level architecture design studio, including the developed workflow and curriculum, and lessons learned from the students’ and instructors’ experiences. The studio program pursues two learning goals namely implementing multi-variate analyses to develop a sustainable design concept as well as practicing collaboration and communication inside an interdisciplinary team. The results of this paper are mostly useful for students and new professionals in the AEC field who want to take most advantage of the emerging data-driven built environments and adopt a new mindset that supports the integration of construction information into the design process. Specifically, the outcomes of the design studio effort are summarized in the following three categories: (1) the development of a generalized and standard workflow for implementing parametric, computational, and performance-based design and construction approach that assists project teams to create design concepts, evaluate their design performance, and visualize the results, (2) the establishment of a framework for evaluating the quality of design process and collaboration in an integrated design team, and (3) the creation of visual programming methods and tools and design/construction software applications for systematic design programs’ analysis and data visualization/interpretation for knowledge-based decision making (this work is in progress).

The present study is part of a series aimed at enhancing the reliability of JIS B 1759, ”Estimation of tooth bending strength of cylindrical plastic gears.” This study examined the stress correction factor converting the nominal tooth bending stress into the local one. The current version has a problem with underestimating the load capacity of internal gears, but considering the contact ratio under load has alleviated the problem. Nevertheless, some issues remain, which led the present paper to determine an alternative stress correction factor through finite element analyses of internal virtual spur gears. Before discussing the alternative factor, examining the fillet profile of injection-molded internal spur gears led to proposing a single circular arc as the standard fillet. Based on that, FEAs of internal virtual spur gears with a single circular fillet determined the modified stress correction factor, which can relieve JIS B 1759 of the underestimations. The modified factor enables the standard to estimate load capacity regardless of external or internal gears, which improves the reliability of the standard.

Parametric design enables iterative and customizable design approaches for textile pattern design. This project based research aims to address the question of how parametric design may be applied to generate iterative and dynamic patterns for a textile screen. Utilizing Grasshopper and Rhino3D as a computational tools to develop a series of bespoke parametric knitting patterns (McNeel 2018; Grasshopper Development Team 2020). The patterns are generated by manipulating design parameters such as stitch and floats. The study also addresses the interplay between digital design tools and the tactile craftspersonship of textile fabrication, highlighting the integration of computation and tradition. The integration of parametric design in textile pattern designs has significant potential for enhancing creativity and innovation, including possible uses in interior design, fashion, and textile art. The study emphasizes the methods of developing the design in the computer and fabricating by hand. In this case computational tools are advancing the design and creatvie process to produce more intricate and dynamic patterns, revolutionizing the way textiles are conceptualized and created.

This study examines Zaha Hadid′s design methodology with a chronological assessment of her work and its roots in parametric design. Zaha Hadid and Patrik Schumacher1 pursue Parametricism, and have executed a series of projects that embody it. Her recent work however, does not show building geometry influenced by paintings that can be found in her early work. This study reinterprets the paintings of Malevich, an originator of Suprematism who is believed to inspire her early work from the perspective of Gestalt psychology with parametric observation within the discourse of Parametricism in order to discover consistent design approaches throughout her practice. By investigating her inspiration from Malevich in her early work to her more recent parametric design approach, Zaha Hadid′s consistent design methodology within the evolution of her work is investigated.