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Method for determining a parameter characteristic of the fatigue state of a part

A technology of fatigue state and eigenvalues, applied in strength characteristics, engine components, instruments, etc., can solve problems such as incomplete real-time provision, and achieve good diagnostic results

Inactive Publication Date: 2009-07-29
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The disadvantage of this proposed solution is, however, that the measured values ​​required for determining the characteristic values ​​of the fatigue state are only available not completely in real time during load cycles, which may each, depending on the use of the respective component, last for more than a considerable amount of time. a long period of time, such as months or even years

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  • Method for determining a parameter characteristic of the fatigue state of a part

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Embodiment Construction

[0022] The load cycle of the steam turbine components shown in their entirety in FIG. 1 starts at time t1 in the initial phase of the steam turbine. by t 1 From moment to moment, the steam turbine gradually heats up so that a positive temperature difference is established between the surface and the interior of the corresponding component. In this phase, the load curve 2 which characterizes the load cycle in diagram 1 first rises. When the steam turbine continues to heat up, the temperature difference first continues to increase until at t 2time reaches a maximum value of 4.

[0023] In the case of near equilibrium, the temperature difference then decreases again until at t 3 An equilibrium state is reached at all times, in which the same temperature distribution is present within the respective component. In the exemplary embodiment shown in FIG. 1 , depending on the mode of operation, a slight cooling of the component then takes place, wherein this cooling also takes pla...

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Abstract

The method for determining an approximation of the characteristic value of the fatigue state of a component due to a time-varying load over a number of load cycles should itself be realized in a relatively long-lasting load cycle that is particularly satisfactory and suitable for real-time Diagnostics regarding the current fatigue state of components to determine maintenance intervals. For this purpose, in addition to already closed load cycles in given cases, only partially closed load cycles are also taken into account when determining the characteristic values, wherein the temporary load values ​​of the not yet elapsed phases of the only partially closed load cycles are taken into account. is a predetermined fixed value.

Description

technical field [0001] A method for determining approximate values ​​of the characteristic values ​​of the fatigue state of a component. [0002] The invention relates to a method for determining an approximation of a characteristic value of a fatigue state of a component due to a time-varying load over a plurality of load cycles. Background technique [0003] In the application of a large number of technical devices, assemblies or components may be exposed to alternating or time-varying loads, for example in the form of mechanical or thermal loads. The individual components can be subjected to, for example, direct mechanical loads through the compressive or tensile stresses that occur. Such time-varying thermal loads arise, for example, in turbine components or components, especially in the steam turbine, when the steam turbine is started or stopped. [0004] During start-up of the steam turbine, that is to say the turbine components are gradually heated from a cold start...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D21/00F02C9/00
CPCF01D21/00G01N2203/0224G01N2203/0073F02C9/00G01N2203/0244
Inventor A·博德E·戈布雷赫特
Owner SIEMENS AG