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Home Environmental Stress-strain analysis of diesel engines on the basis of finite elements method and holographic interferometry

Stress-strain analysis of diesel engines on the basis of finite elements method and holographic interferometry

Description

A new technology for stress and strain analysis in complicated and extra complicated mechanical systems, such as diesel engines, is proposed on the basis of the finite elements method and holographic interferometry. The holographic speckle interferometry technique is the most advanced optical method used in the analysis of material deformation and fracture processes, enabling non-contact measurements to be carried out on the 3D field of rough surfaces. However, difficulty in obtaining accurate results and absence of back propagation leads to a total failure of the analysis. The developed hardware-software system includes geometric modelling in Pro/ENGINEER system, finite elements modelling in ANSYS and the parallel experiments on the holographic unit. The verification analysis of the results achieved and the adjustment of the models’ parameters is carried out by the specialized software.

Innovative Aspect and Main Advantages

The main novelty is that experimental and numeric examination is carried out as a single process. The results of examination are being compared not only at the end of the research, but also during the whole process. A tetra-component model of a diesel engine system under examination is being developed on the basis of the suggested method of generalized parametric description of complex and extra complex mechanical systems, in particular:

  1. real object of research;
  2. mathematic model of the physic-mechanical process under consideration;
  3. numerical (finite-element) model;
  4. experimental model (physical object model together with measuring equipment – a holographic unit).

The main advantage is the combination of contemporary informational technologies, experimental research and mathematic models in a single process.

The suggested technology has substantial principal advantages, such as:

  1. 2-3 times increase in the research efficacy;
  2. The precision of displacement determination – up to 0,1 micrometer;
  3. Contact-free method of holographic interferometry annihilates possibility of deviations in the conduct of sensitive objects;
  4. The suggested method enables to determine the reaction of the object researched to the change of not only separate factors, but also to the variation of the whole multitude of factors;

Areas of Application

  • There are no fundamental limitations as to the nature of objects under consideration (machine-building constructions, building constructions, bio-mechanical systems, non-linear phenomena of plasticity, creep, transient analysis, etc.
    1. Precision instruments production
    2. Microelectronics
    3. Chemical engineering
    4. Power engineering
    5. Medicine

    Hardware-software system for stress and strain analysis in objects with complicated geometries
    Fig. 1 Hardware-software system for stress and strain analysis in objects
    with complicated geometries

    Interferograms
    Fig. 2 Interferograms

    Numerical modeling
    Fig. 3 Numerical modeling

    Stage of Development

    Technological developments are done and worked out on the basis of soft hardware complex uniting the system of two-processors computer stations, “SIN-1” holographic unit and ANSYS, LSDYNA, Pro/ENGINEER, SolidWorks software.

    Contact Details

    Contact person: Mykola Tkachuk
    National technical University “Kharkov Polytechnic Institute”
    Address: Kharkov, 21 Frunze str., KhPI, departament TMM
    Tel/Fax: (380-57) 707-6902
    Mob.: 8(067) 573-6117
    E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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