Hydraulic Leveling

Hydraulic Leveling

Popularity of Hydraulic Fitness Equipment

We make use of hydraulic mechanism in our lives in one way or the other. Starting from the brake in our cars to the elevators in our apartments to other heavy machines, hydraulic system is widely in use. Fitness equipment is not any different from these. There are many exercise machines that work on the principle of hydraulics.

When we talk about hydraulic fitness equipment, it implies those fluid operated machines used for strength training through resistance. Hydraulic fitness machines are designed to be balanced and stable offer an excellent workout for every person at any fitness level.

How does a hydraulic fitness equipment works?

A hydraulic exercise machine is made with a hydraulic cylinder. The cylinder helps the person using the equipment to work at various levels of exertion without making any adjustments to the machine. Hydraulic cylinder use oil or fluid. Pressure or force is exerted on this oil or fluid by the help of a piston connected to the cylinder. Force is exerted on a piston inside the cylinder, which leads to the movement of the machine. Thus, instead of adjustable weights, hydraulic fitness equipments use cylinders to create more resistance. The harder one pushes, the more the resistance is.

Reasons for popularity

• Hydraulic exercise machines are widely used today in fitness centers. The reason for their high demand is that they are very easy to operate and hence preferred a lot by children, seniors and women.
• Hydraulics is used in exercise machines to add resistance, which helps to build strength.
• The other exercise machines usually have the adjustable weight mechanism which is very hard to move with extra weights. The hydraulic fitness equipment can be used at the user's own comfort and fitness level.
• A relatively weak person can use this machine by pushing slowly but still attaining a fruitful workout with minimum effort. Similarly a strong person can perform faster movements to achieve a fruitful session as well.
• There is no question of muscle soreness using these equipments.
• There is no need to move heavy weights.
• Another advantage of using these machines is that the same machine can be used by different people of different fitness level. That is why many gyms and fitness centers are switching to using hydraulic fitness machines.
• Moreover these equipments are also available with various special features like arm curls, shoulder presses, leg extensions, rotary torsos and biceps etc.

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For more information and online purchase of different hydraulic machines, check out Hydraulic Equipment Manufacturers

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Hydraulic Lift physics help?

A hydraulic lift has two connected pistons with cross-sectional areas 5 cm2 and 500 cm2. It is filled with oil of density 500 kg/m3.

a) What mass must be placed on the small piston to support a car of mass 1100 kg at equal fluid levels?

b) With the lift in balance with equal fluid levels, a person of mass 80 kg gets into the car. What is the equilibrium height difference in the fluid levels in the pistons?

c) How much did the height of the car drop when the person got in the car?

thanks!

A1 = 5 cm² = 5 x (0.01)² m² = 5e-4 m² {small piston area}
A2 = 500 cm² = 500 x (0.01)² m² = 500e-4 m² {car's side piston area}
A2/A1 = force expansion at equal level of oil = 100

since force is proportional to mass, 1100/100 = 11 kg ANS (a)

oil density = 500 kg/m³ = 1/2 that of H2O so height of oil will be twice the equivalent in H2O.
1 atm = 101,300 Pa = 10.3 m of H2O = 20.6 m of oil {equivalence 10.3 m of H2O = 1 atm}
80 kg = 80(9.81) = 785 N {added force on A2}
the added pressure in the oil = 785/500 e-4 = 0.157e5 Pa
oil level drop on car side = 0.157e5/1.013e5 x 20.6 m = 0.155 x 20.6 = 3.19 m of oil ANS (c)

I believe that the answer to b) is the same as c).
The reason is that the height or height difference of the oil (fluid in tube) is directly proportional to the pressure. Thus the new level of the oil (fluid in tube) will be proportional to pressure added. And since the pressure is the SAME on both sides of the hydraulic system ie both the large AND small area pistons, the height or level change will be the SAME on both sides. Therefore an increase in fluid pressure = 80 kg person will drop the level on car side by 3.19 m, and it will also raise the level on the small piston side by the SAME amount. ANS (b).

International Hydraulic Elevator with HORRIBLE Leveling at Dillard's, Florida Mall, Orlando, FL