THEORETICAL RESEARCH ON REASONABLE SHIELD SUPPORT CAPACITY IN CLOSE-MULTIPLE COAL SEAMS WITH THE COORDINATED MINING: A CASE STUDY OF QIANJIAYING COAL MINE.

In order to assess the rationality of the rated shield support capacity (RSSC) experienced selection and guide the reasonable RSSC selection for the subsequent working faces of each coal seam, the coupling relationship between shield and roof strata was revealed during each coal seams mining.According to whether the fractured rock blocks generated

This paper proposes a new driving method for switched reluctance motors (SRMs) using the standard full-bridge inverter.In spite of changing the internal structure of an SRM, the proposed method uses an extra ring structure circuit to make it possible for the inverter to drive the SRM.Next to the standard converter, a controllable DC source is neede

Metal additive manufacturing (AM) processes regularly experience high temperatures, quick velocities and rapid solidification taking place in a small volume melt pool.Accurate capturing of data from the melt pools is very difficult and can require expensive equipment.Physics based numerical models can be used to simulate the AM process.However, the