LMS IMAGINE LAB AMESIM R13 - MAGNiTUDE 64 Bit
Tanja Freeze
For example, changing the geometry of the ports affects the opening time, which helps to decrease the magnitude of the forces generated by switching from low to high pressure. At the same time, it also results in a different distribution of the forces on the swash plate. As a result, the force available to pilot the swash plate is modified. To address swash plate dynamics and noise emissions issues together, system simulation is the only effective solution allowing for efficient tradeoff analysis.
It is worth pointing out that active seat suspensions can offer a great improvement in vibration reduction in commercial vehicles, but are not the best option for vehicles aiming to carry multiple passengers comfortably. First, active seat motion is independent from the cabin; the relative motion might be unintuitive at first for occupant when interacting with the steering wheel, pedals, and vehicle controls (e.g. touch screens) in the cabin. Also, active seats only offer suspension control in the vertical axis and cannot compensate roll and pitch vibrations which are big contributors to motion sickness (Diels and Bos, 2016). Furthermore, a vehicle would need as many active seats as passengers in the vehicle, which would increase cost and weight, notably for public transportation such as mini-buses, shuttles, and full size buses. All of these issues could be resolved with fully active vehicle suspension systems, allowing not only vibration control, but also vehicle attitude corrections and ride quality control of the whole vehicle. In the context of this work, active seat actuators operate with forces that are orders of magnitude lower than vehicle suspensions. The potential for controlled slippage MR actuation in full vehicle suspensions applications remains to be studied.
Figure 6 shows desirable response of the constant power regulator system. As shown in Figure 7, on the other hand, the undesirable performance of an irregular discharge flow is observed at the cut-off pressure area in the performance test results of developed VDAPP. The maximum magnitude of the fluctuation is about 10 liters per minute as shown in Figure 7. In this study, therefore, the operation principle of the mechanical regulator with VDAPP is analyzed, and it is modeled by using AMESim software in order to find out the cause of the undesirable performance. Firstly, in this section, the operation principle of the mechanical regulator with VDAPP is described.
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