To give a brief background on the proposed research being discussed in this paper, the domain of ... more To give a brief background on the proposed research being discussed in this paper, the domain of research is that of knowledge acquisition from documents. The implementation is planned for the domain of manual assembly of aircraft structures. This research aims to develop a knowledge acquisition system for a diagnostic system to detect potential issues in assembly during the planning stages itself. This is to avoid such issues being faced whilst during actual assembly, and to avoid iterations in assembly planning that may result. The research challenge is to acquire the required knowledge from documents and other texts. The procedure to acquire knowledge from text would be tested with texts pertaining to assembly diagnostics and the acquired knowledge is validated by applying it to example assemblies.
Guidelines for a Decision Support Method Adapted to NPD Processes, 2007
Designing is an abstract activity. In designing, solutions must be derived in an environment wher... more Designing is an abstract activity. In designing, solutions must be derived in an environment where design requirements, methods and evaluation criteria are subject to frequent change. Consequently while designing, recognising something that makes something better or worse in relation to its context, is vital to achieve design solution [1]. The interrelationship shared by context and designing though acknowledged; understanding of the same has remained fuzzy yet. A theoretical interpretation of designing and context is a necessary precursor to develop such an understanding. While the literature in design domain is rich in discussions on designing the same is not the case with later. Although a great amount of deliberation on the notion of context exists in other domains of study, however, a comprehensive dialogue in relation to design is needed. This paper intends to address few aspects of this issue by providing a definition of context that is synthesised through a broad survey and ...
A multicomponent binder-plasticiser system based on acrylates was formulated for making flexible ... more A multicomponent binder-plasticiser system based on acrylates was formulated for making flexible tapes of Alumina (58 volume %), to be used for Laminated Object Manufacturing. Optimum lamination parameters were arrived at by viscosity measurement of the binder-plasticiser system and ...
The medial axis transform (MAT) has been used in meshing algorithms for decomposition (Tam 1991; ... more The medial axis transform (MAT) has been used in meshing algorithms for decomposition (Tam 1991; Price 1995; Price 1997) and for decomposition and termination (Quadros 2000: Quadros Thesis 2000). This paper describes an algorithm that uses the MAT for quad meshing that is adapted to the variation of geometric feature size in the domain. The algorithm is a modification of Lay Tracks, an automatic quad meshing algorithm that uses the MAT for both subdividing the domain and for terminating the advancing front of the mesh. The modification involves the adaptive placing of nodes inside the subdivided regions and makes use of the radius function available in the MAT to identify feature size and adapt the node spacing and mesh size to it. The algorithm has been implemented and tested on some typical geometries. Results on the quality of the mesh obtained are presented.
Artificial Intelligence for Engineering Design, Analysis and Manufacturing, 2016
Documents are a useful source of expert knowledge in organizations and can be used to foresee, in... more Documents are a useful source of expert knowledge in organizations and can be used to foresee, in an earlier stage of a product's life cycle, potential issues and solutions that might occur in later stages of its life cycle. In this research, these stages are, respectively, design and assembly. Even if these documents are available online, it is rather difficult for users to access the knowledge contained in these documents. It is therefore desirable to automatically extract the knowledge contained in these documents and store them in a computer accessible or manipulable form. This paper describes an approach for the first step in this acquisition process: automatically identifying segments of documents that are relevant to aircraft assembly, so that they can be further processed for acquiring expert knowledge. Such identification of relevant segments is necessary for avoiding processing of unrelated information that is costly and possibly distracting for domain relevance. The a...
This paper presents a case study of augmenting an electronic screen with a projected display to h... more This paper presents a case study of augmenting an electronic screen with a projected display to help visualizing sensor data in a smart manufacturing set up. The visualization module displays both spatial and temporal data and by holding a semi-transparent screen in front of an electronic screen, a user can augment spatial information with temporal trend or vice versa. The system also supports interaction through an interactive laser pointer and is integrated to an early warning system to alert any deviation in sensor readings in the contexts of environment and people tracking.
Research into Design for Communities, Volume 1, 2017
For real-time ergonomic applications, it is essential to track body data and perform real-time da... more For real-time ergonomic applications, it is essential to track body data and perform real-time data analysis, for detecting postural deviations and possible ergonomic difficulties. This paper presents a setup that uses a body tracking system for automated, real-time postural data collection during an assembly task, for use in ergonomic studies. An analysis of the tracked data in developing a measure for assemblability assessment is also presented. A case study of a standing posture assembly, which involved inserting a threaded bolt into a threaded hole in a peg board, is used for the analysis. During the assembly task, postural data of operators is tracked automatically and analysed for angular variations in time, which is then compared with the benchmarks provided by RULA. The time taken in various postures across the activities is also compared. The results show that variation in the torso angle can be taken as a potential measure for assessing reach difficulty in assembly.
ABSTRACT Fused deposition of ceramics (FDC) uses thermoplastic binder and ceramic blend as feed m... more ABSTRACT Fused deposition of ceramics (FDC) uses thermoplastic binder and ceramic blend as feed material. The geometry of the fused deposition machine restricts the workability of the FDC feed material, which is in the form of a filament. The feasibility of the usage of these filaments is mainly based on the viscosity at the working temperature and the compressive modulus of the feed material at near room temperature. The polymers based on Polyethylene (PE), having two molecular weights 3,000 (LDWAX) and 341,000 (LDPE) were mixed in various weight proportions by solvent method using toluene as solvent, to develop a binder system for Fused Deposition Modeling of alumina. Variation of viscosity as a function of composition, temperature and solid loading was measured using spindle viscometer and capillary rheometer. Dilatometric thermal expansion of 50 Vol% alumina compounded binders is measured up to 120 ° C. The pronounced softening of the compounded mixture is observed beyond 70 ° C, when the volume % of LDWAX is in excess of 50% total binder content. The compression strength decreases from 720 N to 310 N for pellet having 1.2cm diameter and 1.5 aspect ratio, when the percentage of LDWAX varies from 40 to 70% in the binder composition. The suitability of the compounded mix of LDWAX and LDPE binder with 40 Vol. % alumina for FDC is being evaluated in a Stratasys TM 1600 machine. Introduction The success of the FDC [1-2] or injection molding [3-4] is mainly dependent on the detailed characterization and selection of the proper feed material composition. A multicomponent binder (MB) system containing base binder, plasticiser, and tackifier have been found to be useful in FDC [5]. The advantage of MB over simple unicomponent binder system is its cumulative and variable property with the composition. The different decomposition temperature of each component in the binder system will minimize the cracks in the sample after binder burn out. The role of materials processing [6] and solid loading are the other parameters, which control the property of the feed material. In this paper we restrict ourselves to a particular solid loading of 50 Vol. %.
This paper describes a method for constructing circular blends using geometric tools. The algorit... more This paper describes a method for constructing circular blends using geometric tools. The algorithm presented in this paper is based on marching along a characteristic direction on the tangent plane to the Voronoi surface of the two surfaces being considered for blending. Starting from any point on the edge to be blended, the algorithm converges to the spine curve. The characteristic direction of marching lies on the plane containing the points in assignment and the tangent plane to the Voronoi surface. The spine curve generation algorithm presented in this paper, does not require computing o sets of surfaces or an explicit evaluation of surface-surface intersection (SSI). The algorithm presented is computationally simple and fast, and can be used for constant and variable radius circular blending of surfaces, each of which is G continuous. The algorithm can also be used to obtain the surface-surface intersection curve by setting the radius of blend to zero.
The research work reported here is part of a larger project aimed at acquiring knowledge about is... more The research work reported here is part of a larger project aimed at acquiring knowledge about issues in assembly, from documents. In order to do so, the first step is to identify the presence of issues. For this, sentiment analysis is proposed as a means. The presence of issues is proposed to be found by detecting negative sentiment. However, general English sentiment lexicons are not enough to detect negative sentiment in specialized domains, in this case, aircraft assembly. This paper studies an existing sentiment analysis tool, and creates an enhanced sentiment lexicon on the basis of the performance of the tool. The enhanced domain lexicon is proposed as the solution to identifying domain specific issues.
Abstract Process planning for a computer numerical control (CNC) machining is a multi-objective d... more Abstract Process planning for a computer numerical control (CNC) machining is a multi-objective decision-making activity. A process planner defines machining set-up along with operation-sequencing at macro-level and decides toolpath strategies with its cutting parameters at micro-level. This paper proposes a data driven model that enables consideration of energy consumption also as a decision-making criterion during process planning for five-axis machining. A two-stage predictive energy model with an intermediate stage of exact feed prediction is proposed for machining on a five-axis machine. A process planner can use this model to choose optimal machining conditions that minimizes energy consumption during five-axis machining.
To give a brief background on the proposed research being discussed in this paper, the domain of ... more To give a brief background on the proposed research being discussed in this paper, the domain of research is that of knowledge acquisition from documents. The implementation is planned for the domain of manual assembly of aircraft structures. This research aims to develop a knowledge acquisition system for a diagnostic system to detect potential issues in assembly during the planning stages itself. This is to avoid such issues being faced whilst during actual assembly, and to avoid iterations in assembly planning that may result. The research challenge is to acquire the required knowledge from documents and other texts. The procedure to acquire knowledge from text would be tested with texts pertaining to assembly diagnostics and the acquired knowledge is validated by applying it to example assemblies.
Guidelines for a Decision Support Method Adapted to NPD Processes, 2007
Designing is an abstract activity. In designing, solutions must be derived in an environment wher... more Designing is an abstract activity. In designing, solutions must be derived in an environment where design requirements, methods and evaluation criteria are subject to frequent change. Consequently while designing, recognising something that makes something better or worse in relation to its context, is vital to achieve design solution [1]. The interrelationship shared by context and designing though acknowledged; understanding of the same has remained fuzzy yet. A theoretical interpretation of designing and context is a necessary precursor to develop such an understanding. While the literature in design domain is rich in discussions on designing the same is not the case with later. Although a great amount of deliberation on the notion of context exists in other domains of study, however, a comprehensive dialogue in relation to design is needed. This paper intends to address few aspects of this issue by providing a definition of context that is synthesised through a broad survey and ...
A multicomponent binder-plasticiser system based on acrylates was formulated for making flexible ... more A multicomponent binder-plasticiser system based on acrylates was formulated for making flexible tapes of Alumina (58 volume %), to be used for Laminated Object Manufacturing. Optimum lamination parameters were arrived at by viscosity measurement of the binder-plasticiser system and ...
The medial axis transform (MAT) has been used in meshing algorithms for decomposition (Tam 1991; ... more The medial axis transform (MAT) has been used in meshing algorithms for decomposition (Tam 1991; Price 1995; Price 1997) and for decomposition and termination (Quadros 2000: Quadros Thesis 2000). This paper describes an algorithm that uses the MAT for quad meshing that is adapted to the variation of geometric feature size in the domain. The algorithm is a modification of Lay Tracks, an automatic quad meshing algorithm that uses the MAT for both subdividing the domain and for terminating the advancing front of the mesh. The modification involves the adaptive placing of nodes inside the subdivided regions and makes use of the radius function available in the MAT to identify feature size and adapt the node spacing and mesh size to it. The algorithm has been implemented and tested on some typical geometries. Results on the quality of the mesh obtained are presented.
Artificial Intelligence for Engineering Design, Analysis and Manufacturing, 2016
Documents are a useful source of expert knowledge in organizations and can be used to foresee, in... more Documents are a useful source of expert knowledge in organizations and can be used to foresee, in an earlier stage of a product's life cycle, potential issues and solutions that might occur in later stages of its life cycle. In this research, these stages are, respectively, design and assembly. Even if these documents are available online, it is rather difficult for users to access the knowledge contained in these documents. It is therefore desirable to automatically extract the knowledge contained in these documents and store them in a computer accessible or manipulable form. This paper describes an approach for the first step in this acquisition process: automatically identifying segments of documents that are relevant to aircraft assembly, so that they can be further processed for acquiring expert knowledge. Such identification of relevant segments is necessary for avoiding processing of unrelated information that is costly and possibly distracting for domain relevance. The a...
This paper presents a case study of augmenting an electronic screen with a projected display to h... more This paper presents a case study of augmenting an electronic screen with a projected display to help visualizing sensor data in a smart manufacturing set up. The visualization module displays both spatial and temporal data and by holding a semi-transparent screen in front of an electronic screen, a user can augment spatial information with temporal trend or vice versa. The system also supports interaction through an interactive laser pointer and is integrated to an early warning system to alert any deviation in sensor readings in the contexts of environment and people tracking.
Research into Design for Communities, Volume 1, 2017
For real-time ergonomic applications, it is essential to track body data and perform real-time da... more For real-time ergonomic applications, it is essential to track body data and perform real-time data analysis, for detecting postural deviations and possible ergonomic difficulties. This paper presents a setup that uses a body tracking system for automated, real-time postural data collection during an assembly task, for use in ergonomic studies. An analysis of the tracked data in developing a measure for assemblability assessment is also presented. A case study of a standing posture assembly, which involved inserting a threaded bolt into a threaded hole in a peg board, is used for the analysis. During the assembly task, postural data of operators is tracked automatically and analysed for angular variations in time, which is then compared with the benchmarks provided by RULA. The time taken in various postures across the activities is also compared. The results show that variation in the torso angle can be taken as a potential measure for assessing reach difficulty in assembly.
ABSTRACT Fused deposition of ceramics (FDC) uses thermoplastic binder and ceramic blend as feed m... more ABSTRACT Fused deposition of ceramics (FDC) uses thermoplastic binder and ceramic blend as feed material. The geometry of the fused deposition machine restricts the workability of the FDC feed material, which is in the form of a filament. The feasibility of the usage of these filaments is mainly based on the viscosity at the working temperature and the compressive modulus of the feed material at near room temperature. The polymers based on Polyethylene (PE), having two molecular weights 3,000 (LDWAX) and 341,000 (LDPE) were mixed in various weight proportions by solvent method using toluene as solvent, to develop a binder system for Fused Deposition Modeling of alumina. Variation of viscosity as a function of composition, temperature and solid loading was measured using spindle viscometer and capillary rheometer. Dilatometric thermal expansion of 50 Vol% alumina compounded binders is measured up to 120 ° C. The pronounced softening of the compounded mixture is observed beyond 70 ° C, when the volume % of LDWAX is in excess of 50% total binder content. The compression strength decreases from 720 N to 310 N for pellet having 1.2cm diameter and 1.5 aspect ratio, when the percentage of LDWAX varies from 40 to 70% in the binder composition. The suitability of the compounded mix of LDWAX and LDPE binder with 40 Vol. % alumina for FDC is being evaluated in a Stratasys TM 1600 machine. Introduction The success of the FDC [1-2] or injection molding [3-4] is mainly dependent on the detailed characterization and selection of the proper feed material composition. A multicomponent binder (MB) system containing base binder, plasticiser, and tackifier have been found to be useful in FDC [5]. The advantage of MB over simple unicomponent binder system is its cumulative and variable property with the composition. The different decomposition temperature of each component in the binder system will minimize the cracks in the sample after binder burn out. The role of materials processing [6] and solid loading are the other parameters, which control the property of the feed material. In this paper we restrict ourselves to a particular solid loading of 50 Vol. %.
This paper describes a method for constructing circular blends using geometric tools. The algorit... more This paper describes a method for constructing circular blends using geometric tools. The algorithm presented in this paper is based on marching along a characteristic direction on the tangent plane to the Voronoi surface of the two surfaces being considered for blending. Starting from any point on the edge to be blended, the algorithm converges to the spine curve. The characteristic direction of marching lies on the plane containing the points in assignment and the tangent plane to the Voronoi surface. The spine curve generation algorithm presented in this paper, does not require computing o sets of surfaces or an explicit evaluation of surface-surface intersection (SSI). The algorithm presented is computationally simple and fast, and can be used for constant and variable radius circular blending of surfaces, each of which is G continuous. The algorithm can also be used to obtain the surface-surface intersection curve by setting the radius of blend to zero.
The research work reported here is part of a larger project aimed at acquiring knowledge about is... more The research work reported here is part of a larger project aimed at acquiring knowledge about issues in assembly, from documents. In order to do so, the first step is to identify the presence of issues. For this, sentiment analysis is proposed as a means. The presence of issues is proposed to be found by detecting negative sentiment. However, general English sentiment lexicons are not enough to detect negative sentiment in specialized domains, in this case, aircraft assembly. This paper studies an existing sentiment analysis tool, and creates an enhanced sentiment lexicon on the basis of the performance of the tool. The enhanced domain lexicon is proposed as the solution to identifying domain specific issues.
Abstract Process planning for a computer numerical control (CNC) machining is a multi-objective d... more Abstract Process planning for a computer numerical control (CNC) machining is a multi-objective decision-making activity. A process planner defines machining set-up along with operation-sequencing at macro-level and decides toolpath strategies with its cutting parameters at micro-level. This paper proposes a data driven model that enables consideration of energy consumption also as a decision-making criterion during process planning for five-axis machining. A two-stage predictive energy model with an intermediate stage of exact feed prediction is proposed for machining on a five-axis machine. A process planner can use this model to choose optimal machining conditions that minimizes energy consumption during five-axis machining.
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Papers by B. Gurumoorthy