### Abstract

Original language | English |
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Title of host publication | Proceedings of the IMAC-XXVI: A conference & Exposition on Structral Synamics. Orlando, Florida, USA, 4 - 7 Feb. 2008 |

Pages | 2333-2346 |

Volume | 4 |

Publication status | Published - 2008 |

MoE publication type | A4 Article in a conference publication |

Event | 26th IMAC Conference and Exposition on Structural Dynamics 2008 IMAC XXVI - Orlando, Florida, United States Duration: 4 Feb 2008 → 7 Feb 3008 |

### Conference

Conference | 26th IMAC Conference and Exposition on Structural Dynamics 2008 IMAC XXVI |
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Abbreviated title | IMAC XXVI |

Country | United States |

City | Orlando, Florida |

Period | 4/02/08 → 7/02/08 |

### Fingerprint

### Keywords

- piping vibration
- high cycle fatigue
- finite element

### Cite this

*Proceedings of the IMAC-XXVI: A conference & Exposition on Structral Synamics. Orlando, Florida, USA, 4 - 7 Feb. 2008*(Vol. 4, pp. 2333-2346)

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*Proceedings of the IMAC-XXVI: A conference & Exposition on Structral Synamics. Orlando, Florida, USA, 4 - 7 Feb. 2008.*vol. 4, pp. 2333-2346, 26th IMAC Conference and Exposition on Structural Dynamics 2008

IMAC XXVI, Orlando, Florida, United States, 4/02/08.

**Operational displacement shape based estimation of vibration borne stress variation in a pipeline.** / Vepsä, Ari.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Operational displacement shape based estimation of vibration borne stress variation in a pipeline

AU - Vepsä, Ari

N1 - Project code: 13109

PY - 2008

Y1 - 2008

N2 - Excessive vibration is one of the leading causes of high cycle fatigue in process piping. One way to assess the severity of vibration is to measure the stress variation caused by it with strain gages. An alternative way is discussed in this paper. The basis of this alternative way is formed by operational displacement shapes (ODS) measured from the actual structure. In order to test the method, two different sets of ODS were measured from a secondary feed water piping system of Loviisa 1 nuclear power plant. Two sets of forces were then derived from these two measured ODS sets. Each force set is supposed to be equivalent to the actual loading in a sense that it should produce behaviour analogous to the actual measured ODS when applied to a finite element (FE) model. Two sets of ODS were then computed with the FE model using the derived force sets as input values. As a result, two sets of stress amplitudes were also obtained for the ODS. Vibration borne stress variations in the time domain at the desired locations were then estimated by applying the principle of superposition to the stress variation amplitudes of the individual ODS.

AB - Excessive vibration is one of the leading causes of high cycle fatigue in process piping. One way to assess the severity of vibration is to measure the stress variation caused by it with strain gages. An alternative way is discussed in this paper. The basis of this alternative way is formed by operational displacement shapes (ODS) measured from the actual structure. In order to test the method, two different sets of ODS were measured from a secondary feed water piping system of Loviisa 1 nuclear power plant. Two sets of forces were then derived from these two measured ODS sets. Each force set is supposed to be equivalent to the actual loading in a sense that it should produce behaviour analogous to the actual measured ODS when applied to a finite element (FE) model. Two sets of ODS were then computed with the FE model using the derived force sets as input values. As a result, two sets of stress amplitudes were also obtained for the ODS. Vibration borne stress variations in the time domain at the desired locations were then estimated by applying the principle of superposition to the stress variation amplitudes of the individual ODS.

KW - piping vibration

KW - high cycle fatigue

KW - finite element

M3 - Conference article in proceedings

SN - 978-1-60560-066-6

VL - 4

SP - 2333

EP - 2346

BT - Proceedings of the IMAC-XXVI: A conference & Exposition on Structral Synamics. Orlando, Florida, USA, 4 - 7 Feb. 2008

ER -