The physical model of -20 diesel oil and force model of injector controlvalve of common rail system is built. The changes of the fluid thickness are investigated on thebase of the results of CFD and experiments for co...The physical model of -20 diesel oil and force model of injector controlvalve of common rail system is built. The changes of the fluid thickness are investigated on thebase of the results of CFD and experiments for control valve of injector. The results indicate thata fluid thickness of 0.02-0.03 mm between the poppet and valve guide is sufficient to dampen anyexcessive control valve poppet bouncing.展开更多
The principle of intensified dewatering with expression-type decanter isanalyzed, the factors affecting dewatering of expression-type decanter are studied and thestructural features of expression-type decanter are int...The principle of intensified dewatering with expression-type decanter isanalyzed, the factors affecting dewatering of expression-type decanter are studied and thestructural features of expression-type decanter are introduced. It is proven through the sludgedewatering experiments in the municipal sewage treatment factories of different regions that thisexpression-type decanter developed can satisfy the technical requirements of sludge dewatering inmunicipal sewage treatment展开更多
One of the open issues in principle scheme design of mechanical systems is principle representation, which not only outlines the physical principles, but also facilitates the design synthesis. An energy-based approach...One of the open issues in principle scheme design of mechanical systems is principle representation, which not only outlines the physical principles, but also facilitates the design synthesis. An energy-based approach to represent principle scheme design is proposed. Firstly, an energy interaction model of mechanical systems is established and an intermediate model is derived, in which principle scheme design is transformed into solving the energy functions of system. Then the energy functions are modeled with the language of bond graphs, and principle representation for components is presented. Finally, characteristics of the developed representation approach are analyzed and a design example of gate drive system is given to demonstrate this approach.展开更多
文摘The physical model of -20 diesel oil and force model of injector controlvalve of common rail system is built. The changes of the fluid thickness are investigated on thebase of the results of CFD and experiments for control valve of injector. The results indicate thata fluid thickness of 0.02-0.03 mm between the poppet and valve guide is sufficient to dampen anyexcessive control valve poppet bouncing.
文摘The principle of intensified dewatering with expression-type decanter isanalyzed, the factors affecting dewatering of expression-type decanter are studied and thestructural features of expression-type decanter are introduced. It is proven through the sludgedewatering experiments in the municipal sewage treatment factories of different regions that thisexpression-type decanter developed can satisfy the technical requirements of sludge dewatering inmunicipal sewage treatment
基金This project is supported by the National Natural Science Foundation of China (60174037, 50275013) and Foundation for University Key Teacher by the Ministry of Education.
文摘One of the open issues in principle scheme design of mechanical systems is principle representation, which not only outlines the physical principles, but also facilitates the design synthesis. An energy-based approach to represent principle scheme design is proposed. Firstly, an energy interaction model of mechanical systems is established and an intermediate model is derived, in which principle scheme design is transformed into solving the energy functions of system. Then the energy functions are modeled with the language of bond graphs, and principle representation for components is presented. Finally, characteristics of the developed representation approach are analyzed and a design example of gate drive system is given to demonstrate this approach.
基金partly supported by the National Key Basic Research Project(Grant No.G2000048701)the National Natural Science Foundation of China(Grant No.G40071031).
