Flow rate vs pressure relationship in a hydraulic cylinder

In summary, the flow rate in a hydraulic cylinder is the volume of fluid passing through the cylinder per unit of time, typically measured in L/min or GPM. Pressure is directly proportional to flow rate, as explained by Bernoulli's principle. The relationship between flow rate and pressure is shown by the flow rate vs pressure curve, where an increase in pressure results in a higher flow rate but at a decreasing rate. The size of the hydraulic cylinder can affect this relationship by providing a larger surface area and internal volume. Other factors that can affect the flow rate vs pressure relationship include fluid viscosity, temperature, and design of the hydraulic system, as well as any obstructions or restrictions.
  • #1
serbring
269
2
Hi all,

I need to model an hydraulic cylinder with simulink and to control it according to some rules. What I don't understand is to find a relationship between the flow rate and pressure inside it. Any suggestion is appreciated.

Thanks
 
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  • #2
A hydraulic system is designed so the pipes are large enough to not obstruct the flow. The pressure in the cylinder will be determined by the load connected to the rod.

The flow rate sets the rate of movement of the piston. It is independent of the pressure, except for the external mechanical components connected to the rod.
 

1. What is the flow rate in a hydraulic cylinder?

The flow rate in a hydraulic cylinder refers to the volume of fluid that passes through the cylinder in a given unit of time. It is typically measured in liters per minute (L/min) or gallons per minute (GPM).

2. How does pressure affect the flow rate in a hydraulic cylinder?

The pressure in a hydraulic cylinder is directly proportional to the flow rate, meaning that an increase in pressure will result in a higher flow rate and a decrease in pressure will result in a lower flow rate. This relationship is known as the Bernoulli's principle.

3. What is the relationship between flow rate and pressure in a hydraulic cylinder?

The relationship between flow rate and pressure in a hydraulic cylinder is described by the flow rate vs pressure curve. This curve shows that as pressure increases, the flow rate also increases but at a decreasing rate. Eventually, the flow rate reaches a maximum value and remains constant even with further increases in pressure.

4. How does the size of the hydraulic cylinder affect the flow rate vs pressure relationship?

The size of the hydraulic cylinder can affect the flow rate vs pressure relationship in two ways. Firstly, a larger cylinder will have a larger surface area, resulting in higher pressure for the same force applied. Secondly, a larger cylinder will have a larger internal volume, allowing for a higher flow rate at a given pressure. Therefore, a larger cylinder will generally have a steeper flow rate vs pressure curve compared to a smaller cylinder.

5. What factors can affect the flow rate vs pressure relationship in a hydraulic cylinder?

Aside from the size of the cylinder, other factors that can affect the flow rate vs pressure relationship include the viscosity of the fluid, the temperature of the fluid, and the design of the hydraulic system. Additionally, any obstructions or restrictions in the system, such as clogged filters or valves, can also impact the flow rate vs pressure relationship.

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