Hermann Kloberdanz's research while affiliated with Technische Universität Darmstadt and other places

Publications (40)

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This chapter describes three general strategies to master uncertainty in technical systems: robustness, flexibility and resilience. It builds on the previous chapters about methods to analyse and identify uncertainty and may rely on the availability of technologies for particular systems, such as active components. Robustness aims for the design of...
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Uncertainty affects all phases of the product life cycle of technical systems, from design and production to their usage, even beyond the phase boundaries. Its identification, analysis and representation are discussed in the previous chapter. Based on the gained knowledge, our specific approach on mastering uncertainty can be applied. These approac...
Chapter
During the development of load-carrying systems uncertainty caused by nescience can be handled applying resilience design. With this systematic approach, in addition to robust design, resilient system properties can be achieved. The resilience design methodology comprises new and extended models and methods. The central aspect of resilient properti...
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Resilient systems have the capability to survive and recover from seriously affecting events. Resilience engineering already is established for socio-economic organisations and extended network-like structures e. g. supply systems like power grids. Transferring the known principles and concepts used in these disciplines enables engineering resilien...
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Load-carrying systems often suffer from unexpected disruptions which can cause damages or system breakdowns if they were neglected during product development. In this context, unexpected disruptions summarize unpredictable load conditions, external disturbances or failures of system components and can be comprehended as uncertainties caused by nesc...
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Resilience as a concept has found its way into different disciplines to describe the ability of an individual or system to withstand and adapt to changes in its environment. In this paper, we provide an overview of the concept in different communities and extend it to the area of mechanical engineering. Furthermore, we present metrics to measure re...
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Integrated product design in manufacturing aims to comprehensively tap manufacturing potential for higher durability, lightweight design and additional functional benefits in the realized product. This paper introduces an approach for systematically integrating manufacturing induced properties into product design and is illustrated with a case stud...
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Designers formulate requirements to ensure development processes that anticipate stakeholder needs. Most development projects fail due to vague and imprecisely formulated requirements, which is linked to poor requirement quality in the early phases of development projects.
Conference Paper
Increases in the price and number of resource supply bottlenecks can have far-reaching consequences for mechanical engineering companies. The consideration of supply risks is of growing importance. This paper discusses the role of product designers when considering the criticality of resources from a business perspective, the potential to be realis...
Conference Paper
This paper classifies different types of scaling uncertainty that occur in size range development. Scaling uncertainty can be divided into two groups: One that concerns variance in product or process properties, already described in literature; the other concerns effects that are neglected on purpose or due to ignorance. Uncertainty of this kind is...
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The steady consideration of requirements during the development of new products remains one of the most difficult and challenging tasks in every development process. Within these considerations, quality criteria are existing for the structured formulation and documentation of requirements in requirements lists. Existing approaches focus on the comp...
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This paper presents an approach to developing size ranges of products that have ergonomic requirements. Ergonomic requirements are a main source of semi-similarity in size ranges. This approach is based on a process model for uncertainty analysis, the size range development methodology of Pahl and Beitz, and robust design principles. The process mo...
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In order to take full advantage of manufacturing technologies, designers have to use technology specific manufacturing-induced properties. An adequate selection and optimisation of the manufacturing technology and a consequent combination of product and process development can lead to product innovations. Linear flow splitting yields ultra fine gra...
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Scaling methods allow the estimation of the impact of changes in individual parameters on system performance. In the technical context, physical similarity is the focus. This paper demonstrates the extension of scaling methods to include uncertainty scaling. The advantages of using scaling uncertainty for the development of scaled products and the...
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This paper gives an overview about how to locate uncertainty in product modelling within the development process. Therefore, the process of product modelling is systematized with the help of characteristics of product models and typical working steps to develop a product model. Based on that, it is possible to distinguish between product modelling...
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The authors propose a method to assess the clarity of a design on working principle level. To do so, the Contact and Channel Model is used in an adapted form to differentiate elemental interfaces based on their geometry and function. This classification is used to derive a generic catalogue of elemental interfaces. A product can be represented thro...
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Engineering students face a confusion of requirements and product properties during task clarifi-cation in product development projects. As requirements are mainly documented in the form of desired product properties, customer needs and expectations may not be sufficiently considered during the development of new and innovative products.This paper...
Conference Paper
This paper gives an overview of methods used to describe uncertainty in size range development. Laws of growth, scenario laws of growth and probabilistic laws of growth are extended to allow the calculation of dynamic, size-dependent product behaviour. Dynamic product behaviour can depend on time or load cycles, such as corrosion and wear. Effects...
Conference Paper
This paper presents an approach to address size dependent uncertainty occurring in size range development. A brief introduction of handling estimated uncertainty using scenario based laws of growth is given. Monte Carlo simulation is used to determine the size dependency of stochastic uncertainty in size range products. The results of best- and wor...
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Für die erfolgreiche Entwicklung von Produkten sind typischerweise eine Vielzahl von Einflussfaktoren zu berüksichtigen. Aufgrund von Unsicherheiten, z.B. fehlenden Informationen oder schwankende Einflussgrößen im Produktlebenslauf, ist eine detaillierte Analyse jedoch häufig schwierig. In diesem Beitrag wird deswegen die Wahrscheinlichkeits- mit d...
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Developing sustainable products is no easy task. For designers, this means that not only technical requirements for functional performance but also ecological, economic and social requirements have to be met. Besides comprehensive knowledge in the field of sustainable product development also persistence is demanded. This is due to the fact that de...
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Today, a wide variety of methods to deal with uncertainty in load-carrying system exists. Thereby, uncertainty may result from not or only partially determined process properties. The present article proposes a classification of methods to control uncertainty in load-carrying systems from different disciplines within mechanical engineering. Therefo...
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In mechanical engineering uncertainties occur during the entire life cycle of a product. These uncertainties are defined as deviations from process and product properties. This makes the development of a comprehensive methodology for analysing uncertainties necessary. The methodology is called Uncertainty Mode and Effects Analysis (UMEA) and consis...
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Within this paper products are called robust, if uncertainties (property variations and disturbances) from production and use have no or little influence on the result during the use. In order to design products robust from the beginning of the design process, their design is to be carried out in a methodically supported Robust Design process (RD)....
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Every engineering product is exposed to a multitude of uncertain influencing factors during the different stages of its life cycle. While much effort is invested to deal with this uncertainty during production and use, it often is not adequately taken into account in product development. Moreover, especially in the early design stages well-know met...
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In its entire life cycle every product is exposed to different uncertainties. In technical systems, these uncertainties are generally understood as deviations from nominal states of product and process properties. In development processes uncertainties particularly occur when modelling and forecasting technical or economic product and process prope...
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Within this paper, the model of the "Solutions Space Representatives" (SSR) is presented. The use of the model allows the parallel modelling of products and their processes in mutual dependency already during the early development phases. This leads to a model-based integrated product and process development which clearly exceeds the approaches of...
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In this paper, a catalogue of tools is developed in order to support the design of robust products. Here, disturbances are considered which arise from the environment and have an impact on the product. Three strategies for the controlling of disturbances are presented, "Eliminate disturbance", "Reduce / eliminate disturbance influence" and "Reduce...
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A complete model of uncertainties is being developed in this paper, where uncertainties can be identified on different levels of abstraction. Uncertainties have to be taken into consideration during the planning and developing process especially while building the model and forecasting the technical product and process properties. It enables the as...
Conference Paper
During its life cycle, each engineering product goes through different stages of planning, production and usage. Uncertainties occur in all of these phases. As defined, uncertainties in technical systems are present as far as product and process properties are not determined and deviations of these properties arise. They result either from imperfec...
Article
This approach shows a methodology which allows to systematically integrate the existing models and methods of Robust Design into the development of a product and its life cycle processes. To this end, a model of the design process is presented. At every stage of this model, the required documents are allocated generating a certain documentation. It...

Citations

... Citizens may also share additional unconventional resources, e.g., water in a boiler or electricity stored in car batteries or sourced from privately owned solar panels to charge phones. Thus, instead of failing, resource distribution degrades gracefully [33]. Cities are characterized by networks of infrastructure systems that have developed over time [40]. ...
... Die grundlegenden Resilienzeigenschaften der Systeme werden durch funktionale Resilienzcharakteristiken, vereinfacht als "Resilienzfunktionen" bezeichnet, definiert. [8] Für lasttragende Systeme haben sich die Resilienzfunktionen Reagieren (responding), Überwachen (monitoring), Antizipieren (anticipating) und Lernen (learning) als geeignet erwiesen [9]. Bei der Entwicklung resilienter lasttragender Systeme sind Systemreaktionen auf unbekannte oder nicht berücksichtigte äußere Einflüsse oder veränderte Systemzustände zu definieren und zu realisieren. ...
... In [7] we defined the performance range p of a technical system. It describes the subset of influencing factors for which the system is able to maintain a predefined minimum performance f min . ...
... Integrated Function Model (IF Model) [39] x x x x x x VIII 14 Kinematic Model [40] x x x x I 15 Model of Langeveld (Langeveld) [41] x x x IV 16 Models according to He (He) [42] [43] [44] x x x II 17 Models based on Gero (Gero) [45] [46] [47] x x x x x x II 18 Multibody Simulation (MBS) [34] x x x x VII 19 Node Link Diagram (NLD) [32] x x VI 20 NVH 5 Model [34] x x x x VII 21 Parametric Associativity Graph (PAG) [26] x x x IV 22 Product Architecture [48] x x x VIII 23 [49] x x VIII 24 Product Structure Model [50] x x x x IV 25 Prototype [2] x x x x III 26 Pseudo Rigid Body Model (PRBM) [51] [52] [53] x x x x VII 27 Remanufacturability Model (RM) [54] x x x VII 28 Model of Rihtaršič (Rihtaršič) [55] x x x I 29 SAPPhIRE 6 [56] x x x x VI 30 Sketches [2] x x x x I 31 Statistical Model [57] x x x x VII 32 Symbolic Representations [2] x x x x I [63] x x x x III CAD computer-aided design, C&C² model contact and channel, CPM characteristics properties modeling, FEM finite element method, NVH noise vibration harshness, SAPPhIRE "State Action Parts Phenomenon Input ORgan Effect", SysML systems modeling language the instance that has been found in research. The original sources of the product models are not considered. ...
... Due to the vagueness of formulated requirements, many system development projects were fail due to poor collecting requirement process in the early process. The successful software system is based on required functionalities under particular limitations required from the system [5,6]. Mattmann et al. [6]. ...
... Considering uncertainty during product development is a necessary task (Wiebel et al., 2013;Chalupnik et al., 2009). Following (Kreye et al., 2011), there are four different types of uncertainty: ...
... Another way to enhance understanding of the needs and views of different actors is role-playing. Rath et al. (2013) propose to involve students in a tutorial on sustainable innovation for product design based on role-play, in which teams of students are project teams of a fictitious company. In the game, research associates represent the board of management, while the members of a research group engaged in sustainable products development have the role of consultants. ...
... It can be reduced and turned into aleatory uncertainty by doing research activities. These can also be related to stochastic uncertainty (quantified according to probability theory), estimated uncertainty (with known effects, but difficult to quantify fully), and unknown uncertainty (not possible to quantify) (Engelhardt et al. 2011). A major source of uncertainty are users and their perceptions, which means that simplifications, idealisations, and abstractions, which are central to modelling, will drive uncertainty (Walter et al. 2014). ...
... The UMEA proposes five steps, from the analysis of the environment and objective to the decision on how to deal with the identified and evaluated uncertainty, and offers suitable models and methods for each step. A brief description of these five steps based on Engelhardt et al. (2009Engelhardt et al. ( , 2011 is shown in Figure 4. Engelhardt et al. (2009) In the first step of the UMEA, the system under consideration is separated from its environment. The variables and objects influencing the system are identified. ...