Spring Accumulator $—$ Spring loaded accumulator

Variables

 Name Value Units Description Modelica ID $\mathrm{pistonCylinder}$ pistonCylinder $\mathrm{housing}$ housing $\mathrm{friction}$ friction $\mathrm{fixed}$ fixed $\mathrm{chamber}$ chamber $\mathrm{spring}$ Gas or mechanical spring spring ${p}_{A\left(\mathrm{summary}\right)}$ $\mathrm{chamber.p}$ $\mathrm{Pa}$ Pressure at port A summary_pA ${q}_{\mathrm{cham}\left(\mathrm{summary}\right)}$ $\mathrm{chamber.qcham}$ $\frac{{m}^{3}}{s}$ Flow rate flowing into Chamber summary_qCham ${P}_{\mathrm{hyd}\left(\mathrm{summary}\right)}$ $\mathrm{chamber.summary_HP}$ $W$ Hydraulic Power in chamber summary_HP

Connections

 Name Description Modelica ID ${\mathrm{port}}_{A}$ port_A

Parameters

General Parameters

 Name Default Units Description Modelica ID ${n}_{\mathrm{ports}}$ $0$ Number of ports nPorts ${d}_{i}$ $m$ Inner diameter of cylinder d_i ${V}_{\mathrm{dead}}$ ${10}^{-6}$ ${m}^{3}$ Minimum oil volume dead_volume $m$ $\frac{1}{10}$ $\mathrm{kg}$ Mass of piston m ${s}_{\mathrm{max}}$ $\frac{1}{2}$ $m$ Piston maximum stroke (between stiff, compliant cylinder walls) s_max ${\ell }_{\mathrm{piston}}$ $0.02$ $m$ Length of piston piston_length ${s}_{\mathrm{start}}$ $\frac{1}{2}{s}_{\mathrm{max}}$ $m$ Cylinder initial stroke: default is half full s_start ${p}_{\mathrm{preload}}$ $4.·{10}^{7}$ $\mathrm{Pa}$ Preload pressure for empty accumulator p_preload ${\mathrm{ΔT}}_{\mathrm{system}}$ $0$ $K$ Temperature offset from system temperature dT_system ${c}_{\mathrm{spring}}$ $8.·{10}^{5}$ $\frac{N}{m}$ Spring rate c_spring

Friction Parameters

 Name Default Units Description Modelica ID ${d}_{\mathrm{viscous}}$ $4.·{10}^{3}$ $\frac{Ns}{m}$ viscous_damping

Constant Parameters

 Name Default Units Description Modelica ID ${A}_{\mathrm{piston}}$ [1] ${m}^{2}$ Piston area piston_area

[1] $\frac{1}{4}{d}_{i}^{2}\mathrm{\pi }$