working principle and applications of hydraulic dynamometer ppt
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I need help with ppt for hydraulic dynamometer
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#2
The typical assembly of a test bench of internal combustion engine equipped with a hydrodynamic brake consists of an IC motor as the device under test and the brake that simulates the load. The engine speed, dynamometer speed and dynamometer torque can be measured. The desired set points of motor speed and torque constitute the test bench inputs. The LME water brake is manufactured by AVL Zoellner GmbH, and has a load capacity of 1200 kW, with a maximum speed of 4000 rpm. The water brake can be divided into two essential parts: the rotor driven by the engine to be tested, consisting of the turbine wheel and shaft, and the stator composed by the casing and supply. In contrast to torque converters and clutches (based on the same principle of operation), a water brake has only one rotating part, resulting in a 100% slip between the two units and thus a thermal impact Large on the working fluid.


The working compartment of the hydraulic dynamometer consists of semicircular special blades cast in stainless steel rotor and stators. Water flowing in a toroidal vortex pattern around these fins creates a torque reaction through the dynamometer housing which is measured by a precision load cell. The filling level of the hydraulic dynamometer and, therefore, the load are controlled by a water outlet valve, operated by a closed-loop electro-hydraulic servo system. The energy absorbed by the dynamometer is drawn by the water as heat.
The torque applied by the dynamometer is measured by a load cell installed on the dynamometer arm. The load cell signal is transmitted to a load cell amplifier. The control command is supplied to the analog water outlet valve, via an electronic / pneumatic transducer, which converts the electrical signal into a proportional amount of air as supply to the valve. As for the control platform, dSPACE real-time rapid prototyping tools are used. Together with the real-time interface (RTI), the DS1103 controller card is fully programmable using the Matlab / Simulink environment. The DS1103 card also offers a choice of interfaces, including 50-bit I / O channels, 36 A / D channels, 8 D / A channels, and so on.
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