Abstract
In order to achieve the high efficiency and stable cushioning effect under the uncertain impacting situation, a digital hydraulic damper is developed which can adjust the whole buffering capacity so as to be adaptable to the impacting load on time during the buffering process. In the paper, the mechanism of energy dissipation in the digital hydraulic damper and the whole damping process are studied. The relationship between the energy dissipation process and the control process is given. Firstly, the energy dissipation process of the digital throttling unit is studied, and the mathematical model of energy losses of the digital hydraulic damper unit and the energy dissipation model of the whole digital damper are established. The energy dissipation model of the digital hydraulic buffer is proposed. Secondly, the effect on energy losses caused by the three elements of the digital damper, which are the sudden extension of cross section, form of orifice, and form of cone valve port, is analyzed. Finally, based on the energy dissipation model, the control model of the energy dissipation process is given, which lays a theoretical foundation for detailed structural design and control optimization.
Highlights
As a kind of safety protection device, the hydraulic damper has been widely used in various occasions. e basic working principle is that the energy generated by the impacting body is consumed by means of throttle section which can produce liquid resistance
A digital hydraulic damper consists of several digital magnetic throttle units which are made up of the high-speed on-off valve and the throttle valve. e throttle valve and the high-speed on-off valve are connected in series so as to form the digital throttling unit shown in Figure 2, which consists of the throttle valve body, coil, valve core, gas spring, keeper, and pole shoe
In the formula, q is the average flow rate of the digital damper unit, τ is the pulse width modulation (PWM) of pulse, which is equal to tp/tf, where tp is the pulse width of PWM and tf is the pulse period of PWM, Cd is the flow coefficient, A2 is the area of throttle hole at section 2-2, and Δp2 is the pressure difference of the conical valve orifice
Summary
As a kind of safety protection device, the hydraulic damper has been widely used in various occasions. e basic working principle is that the energy generated by the impacting body is consumed by means of throttle section which can produce liquid resistance. Wang et al [2] studied the structure design, optimization, and dynamic characteristics of multiorifice hydraulic buffer. In order to achieve the above objectives, the energy dissipation process of the digital throttling unit needs to be studied. On this basis, the energy dissipation model and the control model of the digital hydraulic buffer should be proposed, which will provide a theoretical foundation for detailed structural design and control optimization. The energy dissipation process of the digital throttling unit is studied, and the influence of the sudden extension of digital damper unit, valve opening, and extension on energy losses is analyzed. Energy dissipation model of the digital hydraulic buffer is proposed, and the correlative model of energy dissipation and control processes is established, which lays a theoretical foundation for detailed structural design and control optimization
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