| Water Hammer | |
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Hydraulic systems consist of several mechanical components. Because these components are mechanical they require a certain amount of time, known as response time, to react to different pressures, flows, signals etc. This shows a simple hydraulic system that extends and retracts a cylinder by using a closed center directional control valve. This system also uses a relief valve that, when pressure rises due to the valve being closed, allows the pressurized fluid to return to the tank. An improperly sized accumulator will result in a pressure surge due to the time between the directional control valve closing and the relief valve opening as shown. HyPneu can be used to determine the proper sizing required for an accumulator to avoid this pressure surge as shown also. |
Metal Processing |
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During the production of sheet metal, large slabs of steel run across rollers which apply a constant force in order to create a uniform thickness throughout the slab. The slab runs under a series of these rollers until the desired thickness is reached. A problem that can occur in this process is that if the roller is constantly trying to apply the same force at all time then when the roller is in between two slabs the roller will forcefully press between the two slabs. If this happens the entire way down the production line it can produce ripples in the metal. Using HyPneu, the proper logic controls can be determined to create less force through the roller when it is not on a slab and reapply the correct amount of force when it is in contact with another slab. This show how the proper control can reduce the ripples in the sheet metal. |
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| Rapid Manufacturing | |
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When manufacturing certain parts, production times can be cut drastically by feeding the part rapidly and then slowing the feed rate at a specific point to have more accurate positioning. In order to accomplish this task a regenerative system may be used. HyPneu can simulate this system using several cartridge valves as shown as well as using PLC to control a one directional control valve. Using either method provides the same result in HyPneu which shows that the extension speed slows down after reaching 4 inches and then retracts quickly after extending 5.5 inches. |
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