Applying computer simulation management experiment method to study the issue of trans-boundary water conflict is proposed in the paper. Based on the thought that the nature of water conflict is strained relations amon...
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In non-air-conditioned buildings, occupants are able to interact with their surrounding environment using various adaptive opportunities such as opening a window. The availability of these opportunities may make occup...
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In non-air-conditioned buildings, occupants are able to interact with their surrounding environment using various adaptive opportunities such as opening a window. The availability of these opportunities may make occupants feel thermally comfortable across a wider range of conditions than in air-conditioned buildings. Therefore, a good understanding of human adaptive behaviour is required to generate a realistic simulation of the thermal performance for non-air-conditioned buildings. From a field survey carried out in four non-air-conditioned buildings in the summer of 2009, in Loughborough University, UK, it was found that occupants have different preferences when using adaptive opportunities to adjust their surrounding thermal environment. This paper presents a new approach that attempts to model human adaptive behaviour captured from occupant survey data. In addition, an adaptive preference model, which is a key part of the approach, is introduced in this paper.
This paper described a procedure that combines the measurement of dry-friction contact behaviour, its theoretical modelling and the analysis of structures with friction joints. The experimental part describes a fricti...
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ISBN:
(纸本)9780791897652
This paper described a procedure that combines the measurement of dry-friction contact behaviour, its theoretical modelling and the analysis of structures with friction joints. The experimental part describes a friction damper test rig which is specifically designed for measuring the dynamic force-response characteristics of a joint. A hybrid mathematical model, which is a combination of the traditional macro- and micro-slip models, is proposed to represent the joint characteristics and it is shown that such a model represents the measured behaviour better than any of the traditional ones. The final part of the paper demonstrates the procedure applied to a blade-damper test structure and which includes testing, analysis and correlation of both sets of results. The non-linear response levels are predicted using a dedicated program based on the Harmonic Balance Method and it is found that the proposed analysis procedure can predict the amount of response reduction, the optimum friction damper load and the locked natural frequency quite accurately.
The paper presents a critical appraisal of existing methods for modelling and simulation of CNC machine tool feed drives. Their goal is the development of mathematical models which adequately replicate the dynamic beh...
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ISBN:
(纸本)1861941188
The paper presents a critical appraisal of existing methods for modelling and simulation of CNC machine tool feed drives. Their goal is the development of mathematical models which adequately replicate the dynamic behaviour of the actual machines. The advantages and disadvantages of lumped parameter models and modular approach are discussed and the suitability of mixed, hybrid, distributed-lumped modelling is emphasised. Some applications of other methods to CNC machine tool feed drives are examined. The importance of a thorough study regarding the factors influencing the machine dynamic performance and the strategies for error compensation and correction is underlined. The achieved accurate simulations for multi-axis machine tool applications will be used for automatic tuning and condition monitoring purposes.
Corrosive species in various forms exist widely in the environment and can significantly affect wear behaviour of materials, usually accelerating wear. Under some other conditions where the environments are seemingly ...
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Corrosive species in various forms exist widely in the environment and can significantly affect wear behaviour of materials, usually accelerating wear. Under some other conditions where the environments are seemingly non-deleterious in terms of corrosivity, some species from the environment can still affect the tribological behaviour of materials. It is thus extremely important to recognise the roles of reactive species in affecting the tribological processes and to understand the processes of tribo-corrosion interactions. In this paper, the mechanisms of wear debris generation and the roles of reactive species in the generation of wear debris during sliding wear in gaseous or aqueous environments are discussed. The effect of environment on the development of wear protective layers is described. Based on the proposed mechanisms, mathematical models for sliding wear in both dry and aqueous environments are outlined, and the validity of the models is assessed against experimental data in sliding conditions.
Due to high demand for workers and limited technology management in Indonesia, the industries need to focus on increasing worker's productivity in this labour-intensive system. Such system has the inclination to u...
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Due to high demand for workers and limited technology management in Indonesia, the industries need to focus on increasing worker's productivity in this labour-intensive system. Such system has the inclination to use workers to actuate the economic cycle. But in employing human workers, we will face the problem of fatigue. This research identifies factors affecting fatigue recovery of workers and obtained the mathematical model for it. The model was built using the experimental design method that involved three workers with age ranging from 20 to 22 years and obtained that variable of activity, treatment and operator have closely related to fatigue recovery. The mathematical model was obtained as equation of Y=-13,856+15,515X1+2,736X2+3,674X3 with X1 is variable of activity, X2 is variable of treatment and X3 is variable of operator. The results of this research would become an indicator for the manufacturing industries in Indonesia to increase labour's productivity.
Early design decisions have an impact on downstream product development processes. Poor decisions can reduce efficiency and effectiveness, and have a detrimental effect on product quality, delivery time, and cost. How...
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ISBN:
(纸本)9781904670964
Early design decisions have an impact on downstream product development processes. Poor decisions can reduce efficiency and effectiveness, and have a detrimental effect on product quality, delivery time, and cost. However, the range of tools suitable for use in early design is limited, in part because of ambiguity in available design definitions. This paper reports research that investigated the role of complex decision making in a quality incident that occurred in the development of a complex product system. A case study approach with document analysis and semi-structured interviews was used. Data were analysed using lenses from both social sciences and engineering design. In this paper, we report the use of embedded design structures to gain insights into the downstream consequences of design decisions. Results indicate that embedded product, process and supply network structures have the potential to underpin a new generation of design tools for considering downstream complexities arising from early design choices. Such tools could both improve the quality of design decisions and support improved management of development processes by highlighting areas of future risk.
High-speed telecommunications routers are very important systems in today's networked environments. The purpose of this paper is to propose a mathematical model of the faulty behaviour of such systems and, derived...
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As an accident is very common scenario for today's world. This paper presents one more step towards safety of driving through an application called Crash Prediction System (CPS). That analyzes driver's behavio...
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With human interaction systems becoming more interconnected and complex, it is imperative that we validate the human model which solutions are based on to avoid unintended negative outcomes from any oversights. While ...
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