LOGIN TO YOUR ACCOUNT

Username
Password
Remember Me
Or use your Academic/Social account:

CREATE AN ACCOUNT

Or use your Academic/Social account:

Congratulations!

You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.

Important!

Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message

CREATE AN ACCOUNT

Name:
Username:
Password:
Verify Password:
E-mail:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Languages: English
Types: Article
Subjects:
Force identification using inverse technique is important especially when direct measurement through force transducer is not possible. Considering the effects of impact excitation force on the integrity of a lightweight structure, impact force identification has become the subject of several studies. A methodology utilising Operating Deflection Shape (ODS) analysis, Frequency Response Function (FRF) measurement and pseudo-inverse method to evaluate the dynamic force is presented. A rectangular plate with four ground supports was used as a test rig to simulate the motions of a simple vehicle body. By using the measured responses at remote points that are away from impact locations and measured FRFs of the test rig, unknown force locations and their time histories can be recovered by the proposed method. The performance of this approach in various cases such as under-determined, even-determined and over-determined cases was experimentally demonstrated. Good and bad combinations of response locations were selected based on the condition number of FRF matrix. This force identification method was examined under different response combinations and various numbers of response locations. It shows that in the over-determined case, good combination of response locations (i.e. low average of condition number of FRF matrix) and high number of response locations give the best accuracy of force identification result compared to under-determined and even-determined cases.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [1] Starkey J., Merrill G., On the ill-conditioned nature of indirect force-measurement techniques, Journal of Modal Analysis 1989;4:103-108.
    • [2] Yoon J.-Y., Singh R., Estimation of interfacial forces in a multi-degree of freedom isolation system using a dynamic load sensing mount and quasi-linear models, J. Sound Vib. 2011;330:4429- 4446.
    • [3] Ma C.-K., Lin D.-C., Chang J.-M., Estimation of forces generated by a machine mounted upon isolators under operating conditions, J. Franklin Inst. 1999;336:875-892.
    • [4] Ma C.-K., Ho C.-C., An inverse method for the estimation of input forces acting on non-linear structural systems, J. Sound Vib. 2004;275:953-971.
    • [5] Otsuka T., Okada T., Ikeno T., Shiomi K., Okuma M., Force identification of an outboard engine by experimental means of linear structural modelling and equivalent force transformation, J. Sound Vib. 2007;308:541-547.
    • [6] Yoon J.-Y., Singh R., Indirect measurement of dynamic force transmitted by a nonlinear hydraulic mount under sinusoidal excitation with focus on super-harmonics, J. Sound Vib. 2010;329:5249-5272.
    • [7] Liu J., Han X., Computational Inverse Procedure for Identification of Structural Dynamic Loads Computational Mechanics, in: Springer Berlin Heidelberg; 2009, p. 323-323. 58.62 22.31
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article