Kerstin Weinberg and Ulrich Gabbert
The paper presents a new technique for a compatible transition from a h‐refined to a p‐refined finite element mesh. At one or more faces of particularly designed pNh‐transition…
Abstract
The paper presents a new technique for a compatible transition from a h‐refined to a p‐refined finite element mesh. At one or more faces of particularly designed pNh‐transition elements a low order h‐discretization may be combined with a usual p‐mesh in the other parts of the elements. The pNh‐elements are conform finite elements which can be applied in an adaptive scheme controlled by a residue based error estimate. Typical applications which require strongly a local mesh refinement within a p‐finite element mesh are, e.g. the approximation of high gradients and the determination of contact areas. Numerical examples demonstrate the efficiency of the pNh‐element technique for such problems.
Details
Keywords
Denis Anders, Stefan Uhlar, Melanie Krüger, Michael Groß and Kerstin Weinberg
Wind turbines are of growing importance for the production of renewable energy. The kinetic energy of the blowing air induces a rotary motion and is thus converted into…
Abstract
Purpose
Wind turbines are of growing importance for the production of renewable energy. The kinetic energy of the blowing air induces a rotary motion and is thus converted into electricity. From the mechanical point of view the complex dynamics of wind turbines become a matter of interest for structural optimization and optimal control in order to improve stability and energy efficiency. The purpose of this paper therefore is to present a mechanical model of a three‐blade wind turbine with a momentum and energy conserving time integration of the system.
Design/methodology/approach
The authors present a mechanical model based upon a rotationless formulation of rigid body dynamics coupled with flexible components. The resulting set of differential‐algebraic equations will be solved by using energy‐consistent time‐stepping schemes. Rigid and orthotropic‐elastic body models of a wind turbine show the robustness and accuracy of these schemes for the relevant problem.
Findings
Numerical studies prove that physically consistent time‐stepping schemes provide reliable results, especially for hybrid wind turbine models.
Originality/value
The application of energy‐consistent methods for time discretization is intended to provide computational robustness and to reduce the computational costs of the dynamical wind turbine systems. The model is aimed to give a first access into the investigation of fluid‐structure interaction for wind turbines.
Details
Keywords
Linda Höglund, Maria Mårtensson and Kerstin Thomson
The purpose of this paper is to enhance understanding of the conceptualisation and operationalisation of public value in practice by applying Moore's (1995) strategic triangle as…
Abstract
Purpose
The purpose of this paper is to enhance understanding of the conceptualisation and operationalisation of public value in practice by applying Moore's (1995) strategic triangle as an analytical framework to study strategic management and management control practices in relation to public value.
Design/methodology/approach
The paper uses an interpretative longitudinal case study approach including qualitative methods of document studies and interviews between 2017 and 2019.
Findings
In the strategic triangle, the three nodes of authorising environment, public value creation and operational capacity are interdependent, and alignment is a necessity for a strategy to be successful. But this alignment is vulnerable. The findings suggest three propositions: (1) strategic alignment is vulnerable to management control practices having a strong focus on performance measurements, (2) strategic alignment is vulnerable to standardised management control practices and (3) strategic alignment is vulnerable to politically driven management control practices.
Originality/value
With the strategic triangle as a base, this paper tries to understand what kind of management control practices enable and/or constrain public value, as there has been a call for this kind of research. In this way it adds to earlier research on public value, to the growing interest in the strategic triangle as an analytical framework in analysing empirical material and to the request for more empirical studies on the subject. The strategic triangle also embraces political factors, government agendas and political leadership for which there has also been a call for more research.
Details
Keywords
Panagiotis V. Kloutsiniotis and Dimitrios M. Mihail
Following an “employee-centric” approach, the purpose of this paper is to examine the effects of high-performance work systems (HPWS) on employees’ work engagement and job…
Abstract
Purpose
Following an “employee-centric” approach, the purpose of this paper is to examine the effects of high-performance work systems (HPWS) on employees’ work engagement and job satisfaction, and the mediating effect of these variables on employees’ affective commitment and intention of leaving their hospital.
Design/methodology/approach
Structural equation modeling was used on a sample of 296 clinicians (doctors and nurses) across seven Greek regional hospitals.
Findings
The findings indicate a strong positive effect of HPWS on employees’ job satisfaction, affective commitment, and work engagement and a negative effect on their intention to leave. In addition, employees’ engagement and job satisfaction positively mediate the HPWS effects on employees’ affective commitment and negatively on their intention to leave.
Practical implications
The findings not only validate previous studies’ conclusions, but also provide evidence for the potential fruitfulness of the HPWS approach in improving employees’ outcomes and well-being in turbulent times.
Originality/value
Although the argument that HPWS has a positive effect on organizational performance and productivity is well established, there are considerably fewer studies that examine the positive effects of HPWS specifically on employees’ job attitudes and outcomes, and the processes through which HPWS influences health-related outcomes. Finally, this study confirms the argument that HPWS can be a fruitful approach even in a country severely affected by Europe’s debt crisis over the last five years.