About the transition period in the process of cage catching by parachutes
Abstract
When studying the vibrations of rigid reinforcement of mine shafts, it is necessary to distinguish two types of forces of interaction between the parachute device and conductors - braking and coupling. Under the braking force we will understand the force of interaction between parachutes and conductors when the lifting vessel is moving along the conductors, and under the coupling force we will understand the force of interaction between parachutes and conductors when the lifting vessel is stationary in relation to the conductors or moving at a very small speed. In general case, the coupling force is not equal to the braking force. Thus, at action of friction parachutes the difference in the value of braking force and clutching force will be determined by the difference in the value of motion and rest friction coefficients. It should be borne in mind that the rest friction is 1.7-2.8 times greater than the motion friction and, consequently, the clutching force will be greater than the braking force.
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References
- Dobrokhotov A. A. About calculation of rigid reinforcement of mine shafts. Coll.: Problems in Conducting Mining Excavations. Ugletekhizdat, 1955.
- Ponomareva T.A. About dynamic coefficient at calculation of rigid reinforcement of mine shafts. Journal of Mining Institute, 1958, vol. XXXVI, iss. 1.
- Rabinovich I. M., Sinitsyn A. P., Terenin B. M. Calculation of Structures for Short-Term and Instantaneous Forces, pt. 1, PH of VIA, 1956.
- Reference book. Engineering Structures, vol. I. Mashstroizdat, 1950.