Christoph Herrmann

Christoph Herrmann
Technische Universität Braunschweig · Institute of Machine Tools and Production Technology / Sustainable Manufacturing & Life Cycle Engineering

Prof. Dr.-Ing.

About

534
Publications
199,411
Reads
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9,870
Citations
Citations since 2016
321 Research Items
8130 Citations
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201620172018201920202021202205001,0001,500
201620172018201920202021202205001,0001,500
Additional affiliations
October 2018 - present
Fraunhofer Institute for Surface Engineering and Thin Films IST
Position
  • Managing Director
January 2012 - present
Technische Universität Braunschweig
Position
  • Professor (Full)

Publications

Publications (534)
Article
Hydrogen fuel cells have increasingly gained relevance for electric vertical take-off and landing aircraft due to their potential to overcome the main challenges related to batteries. Previous studies have investigated their feasibility for urban air mobility; however, a robust assessment of their environmental implications is still lacking. To fil...
Article
Full-text available
With increasing electrification in the automotive field, lithium‐ion batteries are rapidly becoming an inseparable part of everyday life. To meet the various governmental goals regarding CO2 emissions, it has become imperative to rapidly optimize the manufacturing process to produce high quality batteries at the least possible emissions and cost. M...
Article
Full-text available
Lithium‐ion batteries are used in a wide range of applications, with the electromobility sector being the main contributor to the increasing demand predicted for the next decade. Although batteries play an important role in decarbonizing the transportation sector, their production includes energy‐intensive processes that hinder a more sustainable p...
Chapter
Engineering processes for innovative and eco-efficient automotive components show a high degree of labour division. Domain-specific information needs to be exchanged between actors and serves as input for decision-making, e.g. information on part performance, weight, cost or environmental impact. In current engineering practice, this cross-domain c...
Chapter
The manufacturing of multi-material components for the automotive industry adds additional process steps to the traditional process chain while also employing new manufacturing technologies. Both factors usually lead to higher production costs as well as higher energy demands and environmental impacts. Cyber physical production systems (CPPS) are a...
Chapter
Recent years introduced process and material innovations in the design and manufacturing of lightweight body parts. Lightweight materials and new manufacturing processes often carry a higher environmental burden in earlier life cycle stages. The prospective life cycle evaluation of newly developed manufacturing processes and related production syst...
Chapter
Designing lightweight hybrid multi-material parts for automotive body applications is subject to a large solution space. This results in a large variety of concept alternatives that are able to fulfil the technical performance criteria. Towards prioritizing eco-efficient concepts, life cycle environmental impacts need to be determined at an early d...
Article
Full-text available
Battery cells and their production processes are developing continuously towards higher efficiencies. Conventional Life Cycle Inventories (LCI) applied in Life Cycle Assessment (LCA) studies are either numerical or parametrized, which inhibits their application to changing developments in battery research. Therefore, this article presents an approa...
Article
Electric vehicles powered with renewable energy are considered a key technology to decarbonize the mobility sector. However, the currently used lithium-ion batteries contain environmentally harmful, scarce, and expensive materials. The recycling of spent traction batteries could mitigate the environmental impact of electric mobility by substituting...
Article
Full-text available
Heating, ventilation and air conditioning (HVAC) systems in battery production are a main component of the technical building services (TBS) and ensure the required low moisture conditions in dry rooms for battery cell assembly. In fulfilling these functions, they contribute significantly to the overall energy demand and are among the main energy c...
Article
In the priority model of sustainability, ecology is listed as the most important category of sustainability. A main goal is the decrease of carbon dioxide and other emissions to the environment. To tackle this challenge, the so called biologisation of manufacturing is identified as one lever for sustainability. In this paper, the example of a cooli...
Article
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Socio-technical systems represent complex interactions of humans with ecological, social and economic systems. A system’s design and its operations determine whether its impact is “negative”, “neutral/zero” or “positive” over the system life cycle with regard to its contribution to sustainable development. But coping with exceeded planetary boundar...
Article
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Sustainability aims to meet the demands of the present generation as well as improve the quality of life, develop the economy, conserve resources, and protect the environment for the future generations. Additive manufacturing is one of the techniques to achieve sustainability in manufacturing. Life cycle assessment is a useful tool to ensure viabil...
Article
Condition monitoring plays an important role in production systems, since a failure of a single device could block the whole production line. State-of-the-art technologies such as vibration monitoring, acoustic emission technique, shock pulse method or similar are often applied through a variety of sensors in order to monitor a big amount of differ...
Article
Increasing shares of renewable energy sources, such as photovoltaics and wind energy, challenge the grid stability. In order to ensure grid stability, demand side management is often seen as a solution. Due to its high share of more than 40% of the entire net energy consumption, the German industrial sector has to be analyzed in more detail. As man...
Article
Energy usage in industries is one of the major contributors for climate change, biodiversity loss and resource scarcity. Technological advancements in digitalization led by Industry 4.0 facilitates affordable energy monitoring systems. This allows comprehensive understanding of the primary energy needs and improvement in the areas of inefficiency o...
Article
Factories are complex systems, which are characterized by interlinked and overlapping life cycles of the constituent factory elements. Within this context, the heterogeneity of these life cycles results in life cycle complexity and corresponding conflicts and trade-offs that need to be addressed in decision situations during the planning and operat...
Article
Full-text available
Heating, ventilation and air conditioning (HVAC) systems in a production environment ensure a variety of functions, such as providing a pleasant room climate, ensuring defined process conditions and maintaining clean air in the workplace. In fulfilling these functions, they contribute significantly to the overall energy demand in industry. With the...
Conference Paper
While traditional business models pursue mainly monetary interests, sustainable business models make a contribution to face the ecological and social challenges of our time in an economic way. Companies - especially SMEs - are often faced with the challenge of developing sustainable business models. Typically, new business models often represent a...
Article
Full-text available
Battery raw materials have been identified as one of the main contributors to the overall environmental impact of batteries, however the primary data related to their production remains scarce and is subjected to high uncertainty. In particular, the commercial life cycle inventory datasets related to refining and processing of graphite as an anode...
Article
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The increasing amount of waste from electrical and electronic equipment and the resulting environmental issues are challenging, since product life cycles are too short, and companies continue to rely on linear (business) models. The Circular Economy is an approach to meet these challenges by extending the product lifetime. One way to extend the pro...
Article
Full-text available
In the German industry Heating, Ventilation and Air Conditioning (HVAC) systems account for 11 %–20 % of the final energy consumption. Usually HVAC systems are dimensioned based on static extreme values and thus during most of the operation time, HVAC systems tend to be overdimensioned. In addition, the extensive literature review of 40 papers show...
Article
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The shift towards a climate-neutral economy will affect businesses in the upcoming decades. Companies will need to increase their transformation towards environmentally sustainable businesses in the following years, in which digitalization might be a practical enabler to accelerate this transformation. However, as a starting point, companies requir...
Article
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Manufacturing companies increasingly have to address the risks and contributions related to their environmental impacts. Therefore, more data are needed in order to provide full transparency with regard to production, and to highlight the potential relationships between the process data and the environmental impacts. In order to achieve this data t...
Article
Full-text available
The application of batteries in electric vehicles and stationary energy-storage systems is widely seen as a promising enabler for a sustainable mobility and for the energy sector. Although significant improvements have been achieved in the last decade in terms of higher battery performance and lower production costs, there remains high potential to...
Article
The production of battery materials has been identified as the main contributor to the greenhouse gas (GHG) emissions of lithium-ion batteries for automotive applications. Graphite manufacturing is characterized by energy intense production processes (including extraction), mainly being operated in China with low energy prices and a relatively high...
Article
Full-text available
Recent years introduced process and material innovations in the design and manufacturing of lightweight body parts for larger scale manufacturing. However, lightweight materials and new manufacturing technologies often carry a higher environmental burden in earlier life cycle stages. The prospective life cycle evaluation of lightweight body parts r...
Article
Full-text available
Due to the increasing demand for flights, the aviation sector will become one of the main emitters of harmful emissions such as carbon dioxide (CO2) and nitrogen oxides (NOx) in the long term. Especially short-haul flights are particularly critical because of the high kerosene consumption per passenger kilometer traveled. To counteract this develop...
Article
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The aviation industry is increasingly facing the challenge posed by climate change. Alongside the aviation sector, advances in aircraft design and electric propulsion towards sustainability have also emerged in new segments of transportation, the urban air mobility, which has arisen to address the road traffic congestion challenges particularly fac...
Article
The decarbonization of supply chains in the automotive industry is crucial to limit global warming as the industry is a main contributor to global greenhouse gas emissions. The main emissions during the production of a car result from material production and further production steps of automotive components at suppliers. Therefore, supplier compani...
Article
Full-text available
With an ever-growing population and therefore an increasing demand for healthcare products, the pharmaceutical industry is expected to continue to grow worldwide. This large-scaled production contributes significantly to the environmental impacts. The overall environmental impact of the pharmaceutical industry is estimated to be high due to the com...
Article
Full-text available
The main objective of spare parts supply is to maximize the service level whilst minimizing costs of tied-up capital, operational activities and administrative processes. Additive Manufacturing (AM) offers the opportunity to decentralize the supply chain and manufacture on-demand without minimum order quantities. While AM could improve sustainabili...
Article
Full-text available
Additive manufacturing (AM) currently evolves from a prototyping process to an alternative manufacturing process for end-use parts, advancing into fabrication of low to medium product volumes. Moreover, increasing awareness of environmental impacts of manufacturing lead to the necessity of holistic evaluation among traditional evaluation criteria i...
Article
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The continuously increasing integration of volatile renewable energy sources requires an increasing amount of energy flexibility and organizational effort on the demand side to improve the synchronization of demand and supply. Within factories, energy flexibility potentials can be beneficially exploited to increase the utilization of on-site renewa...
Article
Full-text available
Sustainable manufacturing aims to deal with the challenges such as climate change, biodiversity loss and resource scarcity by minimising the environmental impacts due to product, processes, and systems through optimal use of energy and resources. Life cycle assessment (LCA) has become an important tool to identify, evaluate and assess the environme...
Article
The data supported consideration of the whole life cycle of a product or component for an optimization of the life cycle and single life cycle stages is a promising research area in Life Cycle Engineering. Here, the acquisition of data along the life cycle is essential and can be achieved through the use of emerging so-called Life Cycle Technologie...
Article
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The market environment of manufacturing companies is characterized by numerous challenges. In the course of individualized mass production, companies are faced with the challenge of efficiently and flexibly fulfilling customer-specific production orders. Consequently, current production is characterized by a high diversity of variants, small produc...
Article
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Nanofluids consisting of nanoscale particles in a carrier medium are increasingly used as cutting fluids in minimum quantity lubrication (MQL) due to their enhanced cooling and lubricating properties. These improvements have already been demonstrated, but a fundamental understanding of the underlying mechanisms and particle-surface interactions is...
Article
Full-text available
In this contribution, a concept is presented that combines different simulation paradigms during the engineering phase. These methods are transferred into the operation phase by the use of data-based surrogates. As an virtual production scenario, the process combination of thermoforming continuous fiber-reinforced thermoplastic sheets and injection...
Conference Paper
Full-text available
Integration of additive manufacturing (AM) into series production demands for comprehensive methods and tools. An agent-based process chain simulation framework is proposed to embed AM into a cyber-physical production system. A multi-dimensional evaluation supports the planning of AM process chains as well as their day-to-day operation. The detaile...
Article
Battery technology in combination with carbon-free energy presents a major paradigm shift for the future of the mobility and energy storage sector and already creates an immense demand for large scale battery factories. However, current battery production sites still report considerable scrap rates caused by insufficient process control and a lack...
Article
Due to the increased complexity of products and manufacturing systems as well as increasing competition, the importance of product quality has grown for manufacturing companies. Accordingly, the demand for the analysis of intermediate product features and intermediate product propagation to support process-integrated quality management is growing....
Article
Quality inspection planning is an integral part of the production planning process. It is often derived from the experience of the planner. Despite the increasing availability of data during the manufacturing phase and the emergence of data analytics tools to transform these data into valuable information, there is a lack of revising existing inspe...
Article
Full-text available
To meet the sustainable development goals of the United Nations, the energy and resource efficiency of industrial processes have to increase, and workplaces have to become decent for the involved workers. Plating process chains are typically associated with high energy and resource demand and the use of hazardous chemicals. For the analysis and imp...
Conference Paper
Full-text available
Increasing demand for individualized products as well as the need forflexible and variable manufacturing leads to an increase in the complexity of modernproduction systems (PS). This complexity requires the implementation of digitalisedlean as well as Industry 4.0 (I4.0) measures. Even though these measures might enablethe handling of this complexi...
Chapter
The use of hybrid vehicle components can support the achievement of a more sustainable mobility through e.g. weight reduction and reduced environmental impacts. In order to exploit all potentials of hybrid components a holistic comprehension of the life cycle is necessary, which can be achieved by increasing the transparency through a digital repre...
Poster
Full-text available
Short use time of EEE-devices results in increasing global E-waste with 53,6 Mio tons in 2019 [1]  One solution is extension of product usage by cascade use within Circular Economy (CE) (e.g. repair, resell)  Cascade use increases resource effectiveness but is not well established [2]  Used products have individual condition resulting in differe...
Conference Paper
Full-text available
The conditions for industrial companies are changing due to increasing customer demands for individualised as well as sustainable products. Furthermore, companies are confronted with technological change by digital transformation. Therefore, production planning has to address various structural, procedural and organisational changes. Planning proje...
Article
Nowadays, the availability of data from the manufacturing environment, such as process and operation related data or past maintenance activities enable new possibilities for advanced data analytics like prediction of failure behavior. Possible predictions could consider faults of specific components or even the current product and component propert...
Article
Full-text available
This paper presents a production-centered economic assessment of DLP production in the early product development process, based on Continuous Liquid Interphase Printing (CLIP). It is applied to an automotive exterior part case study to reveal expected process economics and estimate part prime cost for different printer sizes and automation concepts...
Article
Smart Product Service Systems (Smart PSS) have the potential to contribute to a Circular Economy (CE), but in the design of these systems engineering teams often lack information and knowledge on CE strategies and processes. Against this background, the authors propose a knowledge transfer system for the design of Smart-circular PSS. The system can...
Article
Full-text available
In grinding processes, heat is generated by the contact of the grains with the workpiece. In order to reduce damages on the workpiece and the grinding tool, cutting fluids are necessary for most grinding processes. They have the tasks of cooling and lubricating the contact zone and to remove the chips from the contact area. Different types of cutti...
Article
Full-text available
Energy efficiency in industry is a key element in decreasing costs and environmental impact. This especially applies to the battery production, due to the cost-sensitivity and high potential environmental impact. A mandatory production step in the battery production is the cell assembly in dry rooms. The operation of dry rooms requires complex and...
Article
Carbon fibre manufacturing is characterized by a high energy demand due to long processing times and energy intensive thermal processes. Since energy flow related information about the carbon fibre production is rare, lacks in detail and ranges widely, the goal of this paper is to increase the transparency of energy flows in the carbon fibre value...
Conference Paper
Full-text available
Storage technologies such as lithium-ion batteries (LIB) are a key technology to enable emerging transportation as well as sustainable energy policies. The manufacturing of LIB cells is characterized by high scrap rates of up to 40 % in the industry and a high energy demand, leading to a high environmental impact and high costs. Furthermore, the LI...
Conference Paper
Full-text available
With additive manufacturing (AM) becoming a competitive manufacturing process for low to medium production volumes, rapid manufacturing becomes an increasingly relevant manufacturing approach. However, regulations and customers demand more eco-efficient life-cycles of products. This requires engineers and designers to pre-select between productive...