Mine Impact Burial Prediction From One to Three Dimensions

Author:

Chu Peter C.1

Affiliation:

1. Naval Ocean Analysis and Prediction Laboratory, Naval Postgraduate School, Monterey, CA 93943

Abstract

The Navy’s mine impact burial prediction model creates a time history of a cylindrical or a noncylindrical mine as it falls through air, water, and sediment. The output of the model is the predicted mine trajectory in air and water columns, burial depth/orientation in sediment, as well as height, area, and volume protruding. Model inputs consist of parameters of environment, mine characteristics, and initial release. This paper reviews near three decades’ effort on model development from one to three dimensions: (1) one-dimensional models predict the vertical position of the mine’s center of mass (COM) with the assumption of constant falling angle, (2) two-dimensional models predict the COM position in the (x,z) plane and the rotation around the y-axis, and (3) three-dimensional models predict the COM position in the (x,y,z) space and the rotation around the x-, y-, and z-axes. These models are verified using the data collected from mine impact burial experiments. The one-dimensional model only solves one momentum equation (in the z-direction). It cannot predict the mine trajectory and burial depth well. The two-dimensional model restricts the mine motion in the (x,z) plane (which requires motionless for the environmental fluids) and uses incorrect drag coefficients and inaccurate sediment dynamics. The prediction errors are large in the mine trajectory and burial depth prediction (six to ten times larger than the observed depth in sand bottom of the Monterey Bay). The three-dimensional model predicts the trajectory and burial depth relatively well for cylindrical, near-cylindrical mines, and operational mines such as Manta and Rockan mines.

Publisher

ASME International

Subject

Mechanical Engineering

Reference52 articles.

1. Arnone, R. A., and Bowen, L. E., 1980, “Prediction Model of the Time History Penetration of a Cylinder Through the Air-Water-Sediment Phases,” Naval Coastal Systems Center, NCSC Technical Note 734-36.

2. Satkowiak, L. J. , 1987, “Modifications to the NCSC Impact Burial Prediction Model,” Naval Coastal Systems Center, NCSC Technical Note 883-87.

3. Satkowiak, L. J. , 1987, “User’s Guide for the Modified Impact Burial Prediction Model,” Naval Coastal Systems Center, NCSC TN 884-87.

4. Hurst, R. B. , 1992, “Mine Impact Burial Prediction Model-Technical Description of Recent Changes and Developments (U),” (Restricted), Defense Scientific Establishment, DSE Report 149.

5. Experiments on Mine Burial on Impact-Sydney Harbour;Mulhearn;U.S. Navy Journal of Underwater Acoustics

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