Calculation of the non-stationary thermal state of a drilling device for sampling lunar soil

Аuthors

Matushkin A. A.^*, Kozedra P. A.^**, Kurguzov A. V.^***

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: matushkinaa@mai.ru
**e-mail: kpa_777@mail.ru
***e-mail: mandigit@yandex.ru

Abstract

The paper deals with the issues of drilling lunar soil using a new design of a diamond soil intake de-vice. The calculation of heat release in the soil intake device was calculated in two stages, at the first stage, heat flows were found in the diamond bit itself, and at the second stage, the search for the op-timal operating mode of the entire drilling device as a whole was carried out, subject to the ma-ximum allowable temperature rise at the rock intake site of no more than 10 degrees by kelvin. The calcula-tion of the first stage was carried out according to empirical formulas, and the second stage was calcu-lated using finite elements in the ANSYS Workbench software product, namely, using the transient thermal module.
As a result of the calculation, an optimal algorithm for the operation of the drilling device was found, provided that the drill rotates at 3000 rpm and uses a bit made of steel 12X18H10T with 6 abrasive belts. The resulting algorithm of operation is a periodic switching on and off of the drilling device, turning off the drilling device is necessary to cool down the soil intake area. The operation al-gorithm consists of three inclusions of 20, 15 and 10 seconds with a frequency of 100 seconds and a subsequent period of a longer stop for 235 seconds. Thus, work has been carried out to justify the possibility of using a new design of a soil intake device for drilling lunar rock.

Keywords:

regolith, drilling device, lunar soil, unsteady heat transfer, drilling, ANSYS, diamond drilling

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