Browsing by Author "Tomiyama, Tetsuo"
Now showing 1 - 16 of 16
Results Per Page
Sort Options
Item Open Access Adoption of product service systems in health care.(2017-10) Mittermeyer, Stephan Alexander; Tomiyama, Tetsuo; Tiwari, AshutoshHealth care systems are constantly challenged to deliver better quality of care at lower cost. Product Services Systems (PSS) aim to output a higher value to a customer, while reducing resource input required to achieve such value and sustainability. In the health care market this could help companies increase their focus on value for the patient, but also for the health care system as such. This focus on value can ultimately help drive down health care cost, which is one of the most pressing issues in health care systems today. The potential of PSS to address some of the major challenges in the health care market was recognised early in PSS research, however adoption in this field is still below expectation. Motivated by the potential of PSS in health care this work aims to explore the current status of adoption as well as drivers and barriers to future adoption in this market and evaluates if and how PSS can be designed and implemented by companies active in this market. This work showed that PSS can be feasible and useful in this sector as they address relevant current challenges. Future changes in the health care market will likely make PSS even more relevant. Certain concepts of PSS are already applied in the market without leveraging the benefits of a fully developed PSS. Limitations in how the value for patients and other market actors is determined and made transparent is a major challenge in the adoption of PSS. An assessment method is proposed to enable companies to evaluate the value generation of their PSS offerings. In addition, a guideline for PSS design is proposed based on results of this work and field observations. This thesis contributes to a better understanding of PSS adoption in health care by investigating mechanisms in the health care market to understand if PSS can be implemented in a useful manner and how PSS can be adopted in health care in the future. As PSS consists of a number of separate concepts that may be used by themselves and also outside a PSS concept, a detailed analysis was performed to evaluate how PSS concepts are already utilized by industry, as such partial implementations may be a good starting point for full PSS adoption. Adoption of a PSS in any industry requires a measure to evaluate the success of a system implementation or the quality of PSS offerings. Given the complex market network in health care, metrics for evaluations have been identified, linking different dimensions of clinical utility to PSS. Those metrics enable companies to assess PSS systems or scenarios, but also enable development teams to focus their PSS design efforts, as those assessment metrics provide a framework for PSS requirements engineering in this market. Based on the results of the work outlined above, design guidelines were defined to support the development process of PSS in health care.Item Open Access Automation of train cab front cleaning with a robot manipulator(IEEE, 2018-06-21) Moura, João; McColl, William; Taykaldiranian, Gerard; Tomiyama, Tetsuo; Erden, Mustafa SuphiIn this letter we present a control and trajectory tracking approach for wiping the train cab front panels, using a velocity controlled robotic manipulator and a force/torque sensor attached to its end effector, without using any surface model or vision-based surface detection. The control strategy consists in a simultaneous position and force controller, adapted from the operational space formulation, that aligns the cleaning tool with the surface normal, maintaining a set-point normal force, while simultaneously moving along the surface. The trajectory tracking strategy consists in specifying and tracking a two dimensional path that, when projected onto the train surface, corresponds to the desired pattern of motion. We first validated our approach using the Baxter robot to wipe a highly curved surface with both a spiral and a raster scan motion patterns. Finally, we implemented the same approach in a scaled robot prototype, specifically designed by ourselves to wipe a 1/8 scaled version of a train cab front, using a raster scan pattern.Item Open Access Automation of Train Cab Front Cleaning with a Robot Manipulator(Cranfield University, 2018-08-09 09:55) Moura, João; McColl, Willam; Taykaldiranian, Gerard; Tomiyama, Tetsuo; Suphi Erden, MustafaThis files gives a short description of the data used to produce the plots of the paper submitted to review.Besides the data files, we are only submitting the pdf file (CASE2018.pdf) and the accompanying video (CASE2018.mp4).NB. CASE2018.pdf cannot currently be uploaded here but see related article at https://doi.org/10.1109/LRA.2018.2849591 and conference site at http://case2018.org/.The data files can be found in the data_plots folder.The files have the extension *.dat, and the data is separated by a space.Each column of the files correspond to a different measured variable and the rows correspond to the measurements over time.The files are the following:baxter_raster_large.datbaxter_raster_small.datbaxter_spiral.dattrain_raster_large.dattrain_raster_small.datWhere train refers to the experiments done with the functional prototype on the scaled front train.Baxter refers to the experiments done with the Baxter in the curved surface.Raster and spiral refer to the pattern of motion used, and large and small refer to the radius of the raster scan - distance between the parallel lines.The first line of each files indicates the measurement quantities for each column, where:The forces (fx,fy,fz) are measured in Newton.The torques (mx,my,mz) are measured in Newton meter.The positions (x,y,z) are measured in meters.The reference positions (xref,yref,zref) are measured in meters.The time is measured in seconds.Item Open Access Capturing, classification and concept generation for automated maintenance tasks(Elsevier, 2014-04-24) Farnsworth, Michael; Tomiyama, TetsuoMaintenance is an efficient and cost effective way to keep the function of the product available during the product lifecycle. Automating maintenance may drive down costs and improve performance time; however capturing the necessary information required to perform certain maintenance tasks and later building automated platforms to undertake them is very difficult. This paper looks at the creation of a novel methodology tasked with firstly the capture and classification of maintenance tasks and finally conceptual design of platforms for automating maintenance.Item Open Access Challenges of digital twin in high value manufacturing(SAE International, 2018-10-30) Singh, Sumit; Shehab, Essam; Higgins, Nigel; Fowler, Kevin; Tomiyama, Tetsuo; Fowler, ChrisDigital Twin (DT) is a dynamic digital representation of a real-world asset, process or system. Industry 4.0 has recognised DT as the game changer for manufacturing industries in their digital transformation journey. DT will play a significant role in improving consistency, seamless process development and the possibility of reuse in subsequent stages across the complete lifecycle of the product. As the concept of DT is novel, there are several challenges that exist related to its phase of development and implementation, especially in high value manufacturing sector. The paper presents a thematic analysis of current academic literature and industrial knowledge. Based on this, eleven key challenges of DT were identified and further discussed. This work is intended to provide an understanding of the current state of knowledge around DT and formulate the future research directions.Item Open Access Design Interference Detector-A Tool for Predicting Intrinsic Design Failures(Cranfield University Press, 2009-03-31) D’Amelio, V.; Tomiyama, Tetsuo; Rajkumar Roy; Essam ShehabIntricate failures at the system integration phase of the design are mostly generated by interactions of product modules or/and engineering domains. Modules of the product are tested independently and when their integration is performed, design failures are detected. This significantly delays the machine development. This paper aims at introducing a software tool able to predict phenomena which generate destructive couplings of engineering domains and product modules. An example shows how these couplings influence the system behaviors. The analysis is conducted at the conceptual deign level and makes use of qualitative data to reason out behaviors of the product.Item Open Access Design, modelling, simulation and integration of cyber physical systems: Methods and applications(Elsevier, 2016-07-18) Hehenberger, P.; Vogel-Heuser, B.; Bradley, D.; Eynard, B.; Tomiyama, Tetsuo; Achiche, S.The main drivers for the development and evolution of Cyber Physical Systems (CPS) are the reduction of development costs and time along with the enhancement of the designed products. The aim of this survey paper is to provide an overview of different types of system and the associated transition process from mechatronics to CPS and cloud-based (IoT) systems. It will further consider the requirement that methodologies for CPS-design should be part of a multi-disciplinary development process within which designers should focus not only on the separate physical and computational components, but also on their integration and interaction. Challenges related to CPS-design are therefore considered in the paper from the perspectives of the physical processes, computation and integration respectively. Illustrative case studies are selected from different system levels starting with the description of the overlaying concept of Cyber Physical Production Systems (CPPSs). The analysis and evaluation of the specific properties of a sub-system using a condition monitoring system, important for the maintenance purposes, is then given for a wind turbine.Item Open Access Designing contracts for aero-engine MRO service providers: models and simulation(Elsevier, 2017-03-02) Wibowo, Arie; Tjahjono, Benny; Tomiyama, TetsuoThe aero-engine Maintenance-Repair-Overhaul (MRO) service provider has begun to adopt the product-service system (PSS) offering in order to maintain their competitiveness. Such total solution approach combines an availability-based service contract with product offerings (e.g., leasing). The current MRO service provider's contract design method is inadequate to support this offering. Miscalculation often occurs, because many of the decisions are often based on intuitions and experiences, resulting in lower quality, higher cost and longer turnaround time for the maintenance. This paper proposes an enhanced contract design method that is more scientific through the simulation modelling. The models incorporate both customers’ requirements and the shop floor's operational availability. The paper provides discussion on how the results of the simulation of the models can be used to support decision making and the design of availability based contracts.Item Open Access Function allocation theory for creative design(Elsevier, 2016-08-09) Tomiyama, TetsuoFunction structure influences on systems architecture (or product architecture). This paper discusses a design method for creative design solutions that focuses on the allocation of functions. It first proposes a theory called “Function Allocation Theory” to allocate a function to an appropriate subsystem or component during the systems decomposition phase. By doing so, the complexity of design solutions can be reduced. The theory is applied to some examples including collaborative robots and robotics maintenance. Finally, the paper illustrates a case study of designing a reaction-free fastening system using this theory.Item Open Access Integrating Conventional System Views with Function-Behaviour-State Modelling(Cranfield University Press, 2009-03-31) van Beek, T. J.; Tomiyama, Tetsuo; Rajkumar Roy; Essam ShehabThe main contribution of this paper lies in the observations done in industry resulting in an approach of integrating the Function-Behaviour-State (FBS) model with user workflow and interface models to create complex system overview. On one side of the spectrum it focuses on modelling the usage of the system, while on the other side it considers the modelling and managing of interfaces. The choice for both these views is based on an industrial experience with the clinical Magnetic Resonance (MR) imaging system to manage design complexity. The paper gives a real example of the approach.Item Open Access Multidisciplinary design process observations of a "train front cab cleaning robot" project(2017-08) Taykaldiranian, Gerard; Tomiyama, TetsuoThis thesis presents an observation of the designed development process of a train cab front cleaning robot that was demonstrated by building a scaled prototype which was presented during the robotics and autonomous systems dissemination event held by RRUKA. The design process consisted of the systems, mechanical, and software designs which were completed in a multidisciplinary engineering project. Self-reflective observation was conducted to identify problems in decision making, lack of expertise which led to delays, cost increase of the project. The challenges of a multidisciplinary academic design project were addressed during the integration phase when all the system came together in order to build the robot. The problems faced during the project were categorised into external, managerial, logistical, and design issues, which were in turn analysed through.Item Open Access On the Potential of Function-Behavior-State (FBS) Methodology for the Integration of Modeling Tools(Cranfield University Press, 2009-03-31) Alvarez Cabrera, A. A.; Erden, M. S.; Tomiyama, Tetsuo; Rajkumar Roy; Essam ShehabCurrent mechatronic products tend to be very complex systems. A design team is necessary to develop such products, and appropriate modeling and design support tools are essential to aid the design team. The Automatic Generation of Control Software for Mechatronic Systems project aims to develop a set of prototype tools and a framework to integrate available modeling tools, aiming to support the generation of control software for mechatronic machines. The project contemplates functional modeling as part of this framework. This paper considers the Function-Behavior-State (FBS) model as a base for the functional model, and discusses its potential regarding integration of modeling tools.Item Open Access Productisation business model in non-OEM aero-engine MRO service providers(IOS Press, 2016-12-31) Tjahjono, Benny; Tomiyama, TetsuoThe combination of product and service to provide customer’s satisfaction has been known since 1990s in the aerospace industry, particularly within MRO (Maintenance-Repair-Overhaul) service providers. Initially, the OEMs offered servitisation solutions by bundling the product with services. However, to remain competitive, the non-OEM MRO service providers also initiated bundling its service with products as offerings. This productisation business model is a reverse approach of a servitisation business model. This paper identifies and proposes five types of the productisation business model and each of these types will be shown with a descriptive analysis and illustrations to highlight the understanding of the evolution towards providing offers by bundling services with products. Through this study, non-OEM aero-engine MRO service providers will be able to assess the most suitable business model, based on the MRO service provider’s strengths and challenges.Item Open Access Resilient architecture for cyber-physical production systems(Elsevier, 2018-05-24) Tomiyama, Tetsuo; Moyen, FlorianProduction systems are a typical example of cyber-physical systems (CPS) in which a variety of machines, actuators, sensors and control systems are interwoven to produce products as efficiently as possible. Even though sophisticated condition monitoring systems are deployed, stoppage, breaks, and other types of failures still happen. To avoid catastrophic operational disruptions, desirably the production system itself resiliently and autonomously responses to failures. This paper reports a design method for a resilient architecture of a cyber-physical production system that can deal with disturbances and failures in a discrete-event process. A physical demonstrator was built to demonstrate its reconfiguration capabilities.Item Open Access Systems and conceptual design of a train cab front cleaning robot(Elsevier, 2017-03-02) Tomiyama, Tetsuo; García, Luis Rubio; Kršlin, Andraž; Taykaldiranian, GerardThis paper presents and briefly describes the methodology used to get the systems and conceptual design of a train cab front cleaning robot. While the sides of the trains are cleaned by a mechanised washer, the cab fronts are cleaned manually which imply a number of health and safety issues. The aim of this project is first to carry out an analysis of the current procedures in order to detect the possible gaps in the process, generating a list of requirements that will make possible the conceptual design of a cleaning system that fulfil those requirements. The proposed solution includes the division of the system in various subsystems where different solutions for each subsystem will be considered, analysed and selected as a final option to develop a prototype. This paper focuses in the main structure of the robot that holds the end-effector; different conceptual designs are shown that comply with the requirements set in the systems design.Item Open Access Towards an integrated decision making framework for aero engine MRO contract management in the productisation context(Elsevier, 2016-06-13) Wibowo, Arie; Tjahjono, Benny; Tomiyama, TetsuoOne of the most critical elements in the ‘productisation’ of service adopted by today's aero-engine Maintenance Repair and Overhaul (MRO) companies is the match between customer demands and the operational capabilities of the MRO shop. Currently, the service contract is offered based upon experience and intuition rather than on scientific approach. This paper presents an integrated decision making framework to design contracts that considers demand and operational parameters. In addition to literature survey, the approach adopted in building the framework is a case study research, which obtains data from semi-structured interviews, observations and the company archives. Two main perspectives, dynamic operational parameters and shop floor operational parameters, were identified as essential and pertinent to the design and management of the service contract in the productisation context. The framework will incorporate both perspectives to support productisation.