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- Pär Johannesson
- 1998

The concept of rainnow cycles is often used in fatigue of materials for analysing load processes, which in most realistic cases should be modelled stochastically. Methods are developed for computation of the rainnow matrix for random loads that are changing properties over time due to changes of the system dynamics. For a random vehicle load the change of… (More)

- Pär Johannesson, Bo Bergman, +4 authors Jacques de Maré
- Quality and Reliability Eng. Int.
- 2013

- Pär Johannesson
- 2007

Often fatigue tests of materials are performed with constant amplitude loads. When dealing with variable amplitude loads, like random loads, one forms equivalent load cycles. The now commonly used cycle counting method is rainflow counting which was introduced by Endo in 1968. The equivalent definition of rainflow cycles as illustrated in Figure 1 is due to… (More)

- Pär Johannesson
- 1995

In this report we will present a simple way to model and simulate random fatigue loads, which are oftenly both non-stationary and non-Gaussian. The method is based on approximating the non-Gaussian process by a transformation of a Gaussian process. The procedure can be used to simulate loads as well as calculating important cycle properties of the load such… (More)

- Pär Johannesson
- 1998

Pär Johannesson Department of Mathematical Statistics, Lund Institute of Technology, Lund University, Sweden ABSTRACT: How does the fatigue damage to a vehicle depend on the usage of the vehicle? When it is used in its natural environment by a customer, both the drivers and the environmental properties vary in a more or less random way. One can say that the… (More)

- Pernilla Arinder, Pär Johannesson, Ingela Karlsson, Elisabeth Borch
- PloS one
- 2016

Hand hygiene, cleaning and disinfection are pre-requirements for hygiene management in hospital settings and the food industry. In order to facilitate risk management, different contamination scenarios and interventions need to be evaluated. In the present study data on transfer rates and reductions of Staphylococcus aureus were provided in an experimental… (More)

- Pär Johannesson, Thomas Svensson, Leif Samuelsson, Bo Bergman, Jacques de Maré
- Quality and Reliability Eng. Int.
- 2009

We will present an application of the probabilistic branch of Variation Mode and Effect Analysis (VMEA) implemented as a first order, second moment reliability method. First order means that the failure function is approximated to be linear with respect to the main influencing variables, while second moment means that only means and variances are taken into… (More)

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