Hydraulic dynamometers are used to measure the force, torque, and power that is produced by different types of engines, motors and other varieties of rotating movers. Power is capable of being calculated by measuring rotational speed. If a dynamometer measures liquids such as oil or water as a medium of power, the dynamometer is then considered to be hydraulic. Dynamometers are used in multiple industries and have a variety of applications. The marine engineering industry, power production industries, the automotive industry, aerospace design, performance racing, the mining industry, and electric motor generators are all areas where hydraulic dynamometers are commonly used. Another word for hydraulic dynamometer is "dyno." These devices are also commonly referred to as water brake dynamometers. Some other industrial applications of water brakes include data readings in large trucks, off road vehicles, military vehicles, recreational vehicles, and mining equipment. The use of these dynamometers in recreational vehicles is also sometimes necessary in order to provide drivers with certain data readings that they require in order to safely operate their vehicles and machines. Water brake dynamometers are another highly useful device that can be put to many uses within vehicles.
Hydraulic Dynamometers - Taylor Dynamometer, Inc.
Hydraulic Dynamometers - Taylor Dynamometer, Inc.
How They Work
A dynamometer measures power based on the speed rotation of disks and shafts inside of a casing. To cause rotation, liquid flows into hollow grooves that exist between the shafts and disks. The liquid rotates in a spiral motion causing the unit to push against the outer casing. Applied brakes prevent the casing from moving, and that is how the pressure is gauged. Their rotational speed is then measured to give a power output reading. The speed and force with which the shafts and disks turn will vary depending on the amount of pressure applied to them by the movement of liquid. The rotating disks are mounted inside of a casing that surrounds all of the components. The component that measures this data is called a load cell. The load cell is usually located on the arm of the dynamometer. A signal is transmitted by the load cell to a load cell amplifier. Additionally, an analog water valve supplies control command through the use of an electronic transducer. This transducer converts the electric signal proportionally to air quantity supply to the valve. The fill level of the hydraulic dynamometer and the consequent load is then controlled by a water outlet valve. This water outlet valve is operated by a closed loop electro-hydraulic system.
How A Water Brake Dyno Works
Water brake dynos work essentially the same way as hydraulic dynamometers do. A water brake dyno uses the principle of viscous coupling. This means that the dynos transfer and read power and rotation using viscous fluid. Water brake dynos have an impeller that measures the turbulence and friction of an engine hooked to a rod. The output shaft of the vehicle using the dynamometer (or PTO, power take off shaft) is coupled to the impeller which spins inside a housing. While the engine is running, the housing is filled with a specified amount of liquid. If you fill the housing with more liquid, the engine subsequently "feels" more load. The amount of energy is measured to determine the amount of force that is required to overcome a braking force.
There are many different types of dynamometers available to consumers today. They each feature their own advantages and can serve a multitude of different applications.
High RPM Dynamometers
Some dynamometers are capable of operating at up to 6,000 rpm and can also be operated in both rotational directions. These dynamometers may be capable of operating at an increased power capacities. These capacities range from 2,125 hp up to 4,250 hp due to larger diameter components.
Low RPM, High Inertia Dynamometers
Other dynamometers operate at a low rpm and have high torque. They commonly have high inertia and can come in very compact varieties. Smaller dynamometers can still handle difficult operating conditions in many cases and usually have a capacity of around 50 hp (37 kW) and a maximum of 6,000 rpm.
Gasoline Water Brake Dynos
Certain water brake engine dynamometers work well with gasoline and lower powered diesel engines. These usually operate at speeds of up to 5,500 rpm, and their capacities usually range from 270 to 805 hp (201 to 600 kW). Some are used as a type of high-speed motor tester. This type of motor tester is common in the automotive industries.
A well-constructed dynamometer can drive productivity and ensure uptime with systems are delivering the best overall value for validations, diagnostics, engine break-ins, and many other important processes. A great dynamometer can ensure a quicker return on a consumer's investments. Well constructed dynamometers can also increase accuracy in areas like off-road vehicles, large trucks, and military equipment. Precise, robust, and repeatable testing is a feature that consumers will appreciate and come to depend on. Some dynos even work well under extremely rough operating conditions, which can be very beneficial to consumers in many situations.
Choosing dynamometer manufacturer is an important part of the purchasing process. Consumers should feel comfortable in their choice of vendor. They can ask any questions that come to mind, and the vendor of their choice will be able to answer them accurately. Vendors usually also have a parts and service department of some kind that customers can access if need be.
Consumers must fully understand what type of dynamometer will be needed for each specific engine type. They must also be well aware of the capabilities of the dynamometer they are purchasing. A quality vendor will be ready and willing to answer all questions that may arise when speaking with potential customers. A good sales representative will help consumers to determine which engine dynamometer best fits their specific requirements.
Dynamometer suppliers ought to have detailed product list so that consumers may review all available options before making a purchasing decision. Engineers of dynamometers ought to also be sure to use high-quality materials well-regulated construction processes. Many manufacturers offer warranties on their dynamometers as well as different types of customer satisfaction guarantees.
A good company who constructs and sells these types of dynamometers also may sell any parts and accessories that may be needed in the future. This can make repairs and upkeep of dynamometers a simpler process for consumers. Many companies maintain an inventory of parts for repairs, consumable replacements, and spares. There are also certain accessories that may be required for dynamometer testing. Some of these include pressure transducers, flow turbines, oxygen sensors, and blow-by meters. A good company will have these accessories readily available as well. These departments may also have any product manuals that consumers will require.
There are a wide variety of competent dynamometer vendors available for consumers to choose from. Each vendor may carry a slightly different product, so consumers must carefully consider which manufacturer they choose before making any purchases. A great company will also be able to assist consumers with servicing and maintaining dynamometers, fixing any issues, or finding any parts that may be necessary. Manufacturers likely want to help their clients feel confident in all purchasing decisions. A reliable supplier and knowledgeable sales representative can make the shopping process much simpler for consumers.
In certain cases, is extremely important that consumers regularly calibrate their dynamometers. This is mainly true for dynamometers used in the power and marine engineering industries. This will ensure accurate test results. When data is collected from these types of dynamometers that seems questionable, it may well be time for a re-calibration. Checking the sensors may be a good idea. Calibration is crucial if consumers want correct readings regarding temperature, pressure, voltage, frequency, and fluid flow.
The product designer that the dynamometer was purchased from can walk consumers through the calibration process. Many companies even offer calibration as a standard service. Not all dynamometers require calibration, but the ones that do must be serviced at regular intervals. Consumers may find these types of calibration services convenient and helpful when it comes time for dynamometers to be calibrated.
Companies who construct these devices in many cases use premium materials and components in order to ensure that they create a reliable and trustworthy product. Using high-quality materials and standards of design makes these devices a better value to consumers. Though initially, they may be more expensive to purchase, they will pay for themselves over time. This is because choosing an inexpensive product that is poorly built will lead to the necessity of repairs and replacement parts more often. Eventually, this can end up costing consumers much more than they would have spent purchasing a high-end dynamometer, to begin with. For this reason, dynamometers ought to be engineered using a manufacturing process that will be conducive to long lasting, durable, and of high-quality dynamometers. Some materials used in the construction of dynamometers include aluminum alloys and stainless steel. Aluminum is a very lightweight material which is useful for many reasons including portability and weight. Stainless steel is corrosion resistant, durable, and strong. There are many different parts at play with these types of dynamometers and it is imperative that they are all working in sync. Many dynamometer constructors adhere to strict regulations and guidelines in order to ensure their products meet strict quality standards. Knowing how that dynamometer is constructed of quality materials can be reassuring to consumers.
Durability and performance are very important. These dynamometers will be put to rugged industrial use and it is important that they can stand up well to wear and tear. Consumers should purchase dynamometers that are constructed of high-quality materials and designed to last. Consumers must also consider the rpm rate that the dynamometer of their choosing is capable of operating at. The ideal dynamometer will strike a balance between absorption characteristics and prime moving components. It is also important for consumers to take into consideration loading limits, speed range, and power capabilities.