A Model for Automatic Control of Vibratory Plate Compactor
of the most Application of automatic control into compaction eglenineering works. This isoduel to problem compared with other machines used in civil g the difficulties in getting proper feedback, consisting of a transfer to the compactor and information on the state of the soil being just under compaction. The The paper presents an approach to this difficult and practically ti p ort nt p h have been discussion contains evaluation of several different responses possibility of a1 in information on g used so far in compaction analysis. compactor without Additionally, involving mathematical model of soil is mechanical behaviour of c pacto considered.
Simulation of Soil-Compaction with Vibratory Rollers
Most frequently, vibratory rollers are used for compaction tasks during earth works and road construction. An increase in roller performance can be achieved by automatically adapting the machine's parameters which determine the compaction result and by automatically controlling the state of compaction continuously. The actual problem is, that because of the extensive variety in properties of the materials to be compacted and the conditions in job site, it is very difficult to state the criteria for the feedback control of the roller parameters. By means of modelling and simulating, the vibration behaviour and compaction effect as well as the interdependence between the state of roller-operation and the state of soil-compaction is investigated. The goal is to aquire knowledge about the interactions between vibratory rollers and soil during compaction in order to improve roller construction and automatic compaction measuring-systems.
Engineering mechanics of elasto-plastic composites
Abstract The paper is concerned with the elasto-plastic behaviour of two-phase composite materials with regular internal structure. The macroscopic behaviour of the composite is studied in terms of the mechanical properties of the constituents, their volume fractions and geometrical arrangement. Both constituents are assumed to be elastic-ideal plastic, and the associated flow rule is assumed to be valid. No restrictions are placed on the yield conditions of the constituents. Firstly, the macrobehaviour in an elastic range is described. Then, the method of determination of the initial yield surface of the composite is presented. Subsequently, the incremental equations describing the macrobehaviour in the case when one of the constituents becomes plastic are derived. It also includes a description of the macrohardening phenomenon and a discussion of the determination of the composite limit surface. The proposed theory is illustrated by a single example concerning the elasto-plastic analysis of reinforced earth.