Integration of Risk Management into the Machinery Design Process

Blecha, Petr; Blecha, Radim; Bradac, Frantisek

doi:10.1007/978-3-642-23244-2_57

Cited by 11 publications

(21 citation statements)

References 3 publications

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“…In this Letter, we assume that the merging dual AGNs are coplanar so that they are moving inside their host galaxies (the dual AGNs share a coplane with the host galaxy). This is supported by the fact that dual AGNs are preferentially aligned with the major axis of their host galaxies (Comerford et al 2011), which is confirmed by simulations of Blecha et al (2012). Otherwise, the friction acting on dual AGNs depends on the vertical boundary of their host galaxies.…”

Section: Basic Equations Of the Dynamical Modelmentioning

confidence: 78%

“…Hernquist 1989; Hammer et al 2009). As a potential phase of merging galaxies, dual active galactic nuclei (AGNs) generally exist (Callegari et al 2009; Colpi & Dotti 2009; Yu et al 2011; Blecha et al 2012; van Wassenhove et al 2012). Mergers may result in the so‐called coevolution, for example, tight correlations between SMBH mass and bulge mass or between SMBH mass and velocity dispersion (Di Matteo, Springel & Hernquist 2005; Hopkins et al 2006; Robertson et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, dual AGNs have been systematically found (Comerford et al 2011; Rosario et al 2011; Shen et al 2011; Fu et al 2012) from candidates selected from double‐peaked narrow‐emission‐line AGNs (Zhou et al 2004; Comerford et al 2009a; Liu et al 2010; Rosario et al 2010; Smith et al 2010). In order to explain the observational appearance of dual AGNs, van Wassenhove et al (2012) and Blecha et al (2012) made great attempts to demonstrate that dual AGNs only appear in the late phase of mergers by including most important processes, such as radiative cooling of a multiphase interstellar medium (ISM), star formation, AGN and supernova feedback. With these sophisticated simulations, we still lack sufficient predictions for convenient observational tests.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of dual active galactic nuclei at kpc scales: observational consequences

Wang

Yuan

2012

Monthly Notices of the Royal Astronomical Society: Letters

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Dual active galactic nuclei (AGNs) at kpc scales that originated from galaxy mergers have been found, but the dynamics of the mergers are insufficiently understood, especially the relevant observational consequences. We present evolutionary models of dual AGNs in two cases driven by different friction laws with their surroundings, which are characterized by forces with F∝V* and . The evolutionary behaviours show that there is a minimum time‐scale of ∼108 yr to accomplish a merger. Since the total friction and moment acting on dual AGNs with unequal masses do not vanish, the centre of mass moves with a velocity of Vc∼ a few ten km s−1 and makes an offset of ΔS∼ sub‐kpc of the merged AGNs with respect to the centre of their host galaxies. The relative motion of the two cores along the line joining the centre of mass is of VR∼ a few ten km s−1, which determines the merger time‐scales. Dissipation of the orbital kinetic energy of dual AGNs either enhances stellar velocity dispersion or heats up the interstellar medium in its revirialization to form a soft X‐ray cocoon enshrouding them with a typical luminosity of ∼1042 erg s−1. We predict that galaxies with offset AGNs are likely to host binary supermassive black holes at sub‐kpc scales, shedding light on searching candidates from AGNs.

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Section: Basic Equations Of the Dynamical Modelmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics of dual active galactic nuclei at kpc scales: observational consequences

Wang

Yuan

2012

Monthly Notices of the Royal Astronomical Society: Letters

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“…This development phase of the machine is aimed at ensuring its competence in the area of requirements for its safety, ergonomics and limitation of operator errors. (Blecha, 2011) The implementation of this phase of the solution lies mainly in the consistent application of technical risks management. Guidance on carrying out risk assessment can be found in many places.…”

Section: Analysis and Assessment Of Riskmentioning

confidence: 99%

Development of Production Machines With Respect to the Human Factors

Kotek¹,

Trávníček²,

Tůma³

et al. 2018

TRANSACTIONS of the VŠB – Technical University of Ostrava, Safety Engineering Series

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The inappropriate adaptation of the machinery to human properties and abilities may result both in physiological effects on the operator (e.g. muscle skeletal damage) resulting, for example, from inappropriate body posture, excessive or repeated exertion, and also in psycho-physiological effects such as mental overload or insufficient workload or stress, which may occur due to the operation, inspection or maintenance of the machine within the limits of its intended use. Psycho-physiological effects can lead to an increase in operator’s errors, lower safety or quality, thus directly affecting the quality of the production process. For these reasons, the ergonomics needs to be of high importance. The submitted paper describes the use of advanced virtual reality technologies and risk management in machine development.

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“…Classified into three types: Process Flaws, Individual Flaws and Environmental Flaw Inappropriate Management of Work System -Inappropriate system managing work system elements, such as methods, workers and environments. In 2011, several papers were published dealing with risk management during development of machine tools as well as during development of the related safe software [Blecha 2011a], [Blecha 2011b], [Blecha 2011c]. In the same sphere of industry, the virtual reality technology has been successfully used for simulation and development of safe mechatronic systems [Tuma 2014].…”

Section: Introductionmentioning

confidence: 99%

Methodology of Development and Validation of Software for Safety-Related Parts of Control Systems in Stage Technology

Drlik¹

2019

MM SJ

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The presented paper contributes to solution of safety assurance in complex mechatronic systems used in theatre stage technology. The aim is to solve the problem associated with reasonably foreseeable incorrect behaviour of persons and operators of these systems by application of safety measures respecting the nature of the specific conditions in which such mechanisms are being used. Special attention is paid to development, verification and validation of software for safety elements of the programmable electronic systems used to control the stage mechanisms. The validation is shown on the implementation of the methodology during development of the functional safety system of the stage technology in the National Theatre Brno.

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Integration of Risk Management into the Machinery Design Process

Cited by 11 publications

References 3 publications

Dynamics of dual active galactic nuclei at kpc scales: observational consequences

Dynamics of dual active galactic nuclei at kpc scales: observational consequences

Development of Production Machines With Respect to the Human Factors

Methodology of Development and Validation of Software for Safety-Related Parts of Control Systems in Stage Technology

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