Abstract The flow control of hydraulic transformers is a great challenge. To meet this challenge, a new kind of hydraulic transformer, variable hydraulic transformer （VHT）, is proposed in this work. This paper focus...Abstract The flow control of hydraulic transformers is a great challenge. To meet this challenge, a new kind of hydraulic transformer, variable hydraulic transformer （VHT）, is proposed in this work. This paper focuses on the power characteristics of the newly proposed VHT, including instanta neous power, average power, power pulsation, and efficiency. In the analyses, the concepts of efficiency, input power, output power, starting angle, and ceasing angle are defined or redefined. To investigate the power characteristics, their models are derived by considering the governing fac tors such as the control angle of the swash plate and the structure of the port plate. This work high lights that the load flow can be adjusted by adjusting the control angle of the swash plate, and the power characteristics at the Bport produce a remarkable change. In addition, the VHT has a starting angle and a ceasing angle, and these two angles can be adjusted by the influencing factors. The results reveal that the power pulsation and the jump points of the instantaneous power are the primary causes of a less smooth work. Then, it is shown that the control angle of the port plate, the control angle of the swash plate, and the pressures at the ports are the three key elements for a stable operation. The results also reveal that the adjustment of the influencing factors can improve the efficiency.展开更多
基金co-supported by the Open Foundation of State Key Laboratory of Fluid Transmission and Control of China(No.GZKF-2008003)the National Natural Science Foundation of China(Nos.50875054 and 51275123)
文摘Abstract The flow control of hydraulic transformers is a great challenge. To meet this challenge, a new kind of hydraulic transformer, variable hydraulic transformer （VHT）, is proposed in this work. This paper focuses on the power characteristics of the newly proposed VHT, including instanta neous power, average power, power pulsation, and efficiency. In the analyses, the concepts of efficiency, input power, output power, starting angle, and ceasing angle are defined or redefined. To investigate the power characteristics, their models are derived by considering the governing fac tors such as the control angle of the swash plate and the structure of the port plate. This work high lights that the load flow can be adjusted by adjusting the control angle of the swash plate, and the power characteristics at the Bport produce a remarkable change. In addition, the VHT has a starting angle and a ceasing angle, and these two angles can be adjusted by the influencing factors. The results reveal that the power pulsation and the jump points of the instantaneous power are the primary causes of a less smooth work. Then, it is shown that the control angle of the port plate, the control angle of the swash plate, and the pressures at the ports are the three key elements for a stable operation. The results also reveal that the adjustment of the influencing factors can improve the efficiency.
