... He describes a top-down design methodology to systematically translate key characteristics to... more ... He describes a top-down design methodology to systematically translate key characteristics to critical features on parts and choose consistent assembly ... Wang and Ozsoy [24] provided a method for automatically generating tolerance chains based on assembly fea ...
Presents a state transition model of assembly and concepts from control theory to model variation... more Presents a state transition model of assembly and concepts from control theory to model variation propagation and control during assembly. The assembly process is modeled as a multi-stage linear dynamic system. Two types of assemblies are addressed: Type-1 where the assembly puts together parts at their pre-fabricated mating features, and Type-2 where the assembly process can incorporate in-process adjustments to redistribute variation. The model builds on the concept of the datum flow chain. Algorithms are developed to determine and control variation in final assembly propagated through the combined effect of individual part variations and choice of assembly methods. An optimal control problem is formulated to develop a scientific approach to designing assembly features
Volume 4: 4th Design for Manufacturing Conference, 1999
Complex mechanical products, such as automobiles and airplanes, must satisfy many customer requir... more Complex mechanical products, such as automobiles and airplanes, must satisfy many customer requirements, commonly called Key Characteristics (KCs). Such products have many separate parts, all of which must cooperate to deliver these requirements. In many cases there are more requirements than degrees of freedom available to meet them all independently, requiring prioritization. This problem is called KC conflict. In a highly complex product, such conflicts can be difficult to detect during design. This paper defines this problem and shows how screw theory can be used to detect and potentially correct it.
... want to access the data for non-engineering reasons such as cost analysis, documentation, etc... more ... want to access the data for non-engineering reasons such as cost analysis, documentation, etc. ... A detailed study of the product development process and supporting IT tools for this system ... context, the DSM greatly enhances the value of the existing documented knowledge base ...
... Cambridge, MA 02139 ABSTRACT mis presentation combines historical line-age, assessment of the... more ... Cambridge, MA 02139 ABSTRACT mis presentation combines historical line-age, assessment of the state of the art, and repre-sentative videotapes on robot force control. The ... inertias strategy forcing of a events related geometry to task sequence of ector or ...
One of the most difficult problems which designers of complex mechanical assemblies face routinel... more One of the most difficult problems which designers of complex mechanical assemblies face routinely is not to be aware of when they are committing mistakes. More and more dependence of designers on CAD systems further aggravates the problem of committing the mistake of not giving proper attention to the kinematic structure of the assembly. This article presents design phases for assemblies according to a top-down design process and the generic steps that constitute different design phases. A comprehensive classification of mechanical assemblies follows the outline of the steps of the design process. This classification also defines the characteristics of different types of assemblies and most importantly it identifies the possible mistakes that designers may commit. A separate classification of different procedures for meeting assembly tolerances is also presented. This article will not only talk about the classifications but it will also enlist information about various techniques that can be used to analyze different types of assemblies. Together, these sets of classifications outline a comprehensive design procedure that will help designers of assemblies in making sure that they justify their design decisions. This paper also links the steps in the design process to specific tools developed in previous papers.
Assembly research comprises the definitive description of how parts interact during assembly (cal... more Assembly research comprises the definitive description of how parts interact during assembly (called Part Mating Science), and the collection of part mating processes into systems that assemble products. Products can be assembled by four techniques: manual labor, special purpose machines, programmable systems (a new type of interest in mid volume production), or hybrids of the above. Programmable systems promise to exhibit some of the adaptability of manual labor plus the repeatibility of special machines, a good combination where parts variation and market uncertainties are present.
... He describes a top-down design methodology to systematically translate key characteristics to... more ... He describes a top-down design methodology to systematically translate key characteristics to critical features on parts and choose consistent assembly ... Wang and Ozsoy [24] provided a method for automatically generating tolerance chains based on assembly fea ...
Presents a state transition model of assembly and concepts from control theory to model variation... more Presents a state transition model of assembly and concepts from control theory to model variation propagation and control during assembly. The assembly process is modeled as a multi-stage linear dynamic system. Two types of assemblies are addressed: Type-1 where the assembly puts together parts at their pre-fabricated mating features, and Type-2 where the assembly process can incorporate in-process adjustments to redistribute variation. The model builds on the concept of the datum flow chain. Algorithms are developed to determine and control variation in final assembly propagated through the combined effect of individual part variations and choice of assembly methods. An optimal control problem is formulated to develop a scientific approach to designing assembly features
Volume 4: 4th Design for Manufacturing Conference, 1999
Complex mechanical products, such as automobiles and airplanes, must satisfy many customer requir... more Complex mechanical products, such as automobiles and airplanes, must satisfy many customer requirements, commonly called Key Characteristics (KCs). Such products have many separate parts, all of which must cooperate to deliver these requirements. In many cases there are more requirements than degrees of freedom available to meet them all independently, requiring prioritization. This problem is called KC conflict. In a highly complex product, such conflicts can be difficult to detect during design. This paper defines this problem and shows how screw theory can be used to detect and potentially correct it.
... want to access the data for non-engineering reasons such as cost analysis, documentation, etc... more ... want to access the data for non-engineering reasons such as cost analysis, documentation, etc. ... A detailed study of the product development process and supporting IT tools for this system ... context, the DSM greatly enhances the value of the existing documented knowledge base ...
... Cambridge, MA 02139 ABSTRACT mis presentation combines historical line-age, assessment of the... more ... Cambridge, MA 02139 ABSTRACT mis presentation combines historical line-age, assessment of the state of the art, and repre-sentative videotapes on robot force control. The ... inertias strategy forcing of a events related geometry to task sequence of ector or ...
One of the most difficult problems which designers of complex mechanical assemblies face routinel... more One of the most difficult problems which designers of complex mechanical assemblies face routinely is not to be aware of when they are committing mistakes. More and more dependence of designers on CAD systems further aggravates the problem of committing the mistake of not giving proper attention to the kinematic structure of the assembly. This article presents design phases for assemblies according to a top-down design process and the generic steps that constitute different design phases. A comprehensive classification of mechanical assemblies follows the outline of the steps of the design process. This classification also defines the characteristics of different types of assemblies and most importantly it identifies the possible mistakes that designers may commit. A separate classification of different procedures for meeting assembly tolerances is also presented. This article will not only talk about the classifications but it will also enlist information about various techniques that can be used to analyze different types of assemblies. Together, these sets of classifications outline a comprehensive design procedure that will help designers of assemblies in making sure that they justify their design decisions. This paper also links the steps in the design process to specific tools developed in previous papers.
Assembly research comprises the definitive description of how parts interact during assembly (cal... more Assembly research comprises the definitive description of how parts interact during assembly (called Part Mating Science), and the collection of part mating processes into systems that assemble products. Products can be assembled by four techniques: manual labor, special purpose machines, programmable systems (a new type of interest in mid volume production), or hybrids of the above. Programmable systems promise to exhibit some of the adaptability of manual labor plus the repeatibility of special machines, a good combination where parts variation and market uncertainties are present.
A stati space approach is taken to vehicle merging on high speed highways. The vehicles ate assum... more A stati space approach is taken to vehicle merging on high speed highways. The vehicles ate assumed to be traveling in equal sized "slots" which move at the group velocity. At points where two or more lanes merge, some vehicles must be moved forward or backward to other slots to accomplish the merge. The state of a group of vehicles to be merged is defined in terms of the slots occupied at any time. A finite set of admissible terminal stales, representing possible merged configurations, is easily determined. The sequence of moves required to obtain a merge is found as a shortest path in the space of all states, running from the initial state to the terminal manifold. Various costs may be applied to moves in this space, such as time consumed, or number of vehicles being moved simultaneously. Costs may also be assigned to the terminal arrangements, reflecting, for example, the size of platoons in the resulting merge. Estimates are made of required computing load and the method is compared with other approaches.
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