AMESim simulation comparison of new and old multi-way valve slewing
According to Figure 2-3, build a simulation model of the excavator rotary hydraulic system, as shown in Figure 5-1. AMESim simulation software does not have a rotary motor with reducer module, so it is built according to the actual objects. AMESim simulation software does not have a manual proportional pressure reducing valve module, so it is also built in combination with basic principles and physical parameters. Save the valve port area corresponding to each displacement of the spool as a .txt file, and then import it into the simulation system for simulation calculation.
The main parameters:
Density of hydraulic oil: 872kg / m3; volumetric modulus of elasticity: 1700MPa; temperature: 40 ℃; displacement of hydraulic main pump: 63ml / r; rated speed: 2400r / min;
Rated engine speed: 2400r / min; power: 47Kw;
Displacement of rotary motor: 80ml / r; rated speed: 2200r / min;
Numerical calculation results and analysis After the above simulation system is built, the relevant physical parameters are substituted into each model, the program is run, and the performance parameters of the rotary motor are simulated, and the corresponding performance curve is obtained as follows:
Figure 5-2 shows the curve of the outlet pressure of the rotary motor during the opening of the valve port. The back pressure of the rotary motor corresponding to the new valve is small, but the difference is not large. And the back pressure is gentle at the beginning;
Figure 5-3 shows the flow curve of the outlet flow of the rotary motor during the opening of the valve port. The flow rate of the rotary motor corresponding to the new valve is too large, but the difference is not large, indicating that the new valve has a strong flow capacity under the same circumstances. And in the initial stage, the flow is relatively flat. Among them, the flow rate is a negative value, indicating that the flow direction of the inlet and outlet of the valve is opposite to that of the motor during simulation:
Figure 5-4 shows the inlet pressure change curve of the rotary motor during the opening of the valve port. The inlet pressure of the rotary motor corresponding to the new valve is relatively small, but the difference is not large. And the pressure change of the old valve at the initial stage has obvious steps, while the pressure change of the new valve at the initial stage is relatively smooth;
Figure 5-5 shows the curve of the output torque of the rotary motor during the opening of the valve port. The output torque of the rotary motor corresponding to the new valve is relatively small, but the difference is not large. And the pressure change of the old valve at the initial stage has obvious steps, while the pressure change of the new valve at the initial stage is relatively smooth;
