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Motor Testing
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
As one of the key devices in electric motor testing, dynamometers (or dynos in short) have been used extensively for measuring rotating speed, torque, power output, and force from power sources such as motors and engines. Based on the measured operation characteristic data, motor efficiency and other useful information can be determined. Dynamometers can operate in two basic modes: (a) the absorbing or passive mode in which a dynamometer is driven by the motor under test and provides a specific brake torque load to the testing unit and (b) the driving mode in which a dynamometer drives a machine to determine the torque and power required for operating such a driven machine. A dynamometer that can either drive or absorb is called a universal or active dynamometer.
The reciprocating piston petrol engine
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
As mentioned earlier, a dynamometer is used in an engine testing laboratory to measure the brake power (or effective power) of an engine, because it acts as a brake to balance the torque or turning effort at the crankshaft through a range of speeds. A graph of the engine power curve can be drawn by plotting brake power values against engine speeds (Figure 1.2). Various standardized test procedures may be adopted in engine testing, such as those established by the American Society of Automotive Engineers (SAE), the German Deutsche Institut für Normung (DIN) and the Italian Commissione tecnica di Unificazione nell’ Automobile (CUNA). In an engine specification table only the maximum brake power and corresponding crankshaft speed are usually quoted. For example, the 5.9 litre V twelve-cylinder 48-valve engine used in the high-performance Aston Martin DB9 Volante car is claimed to develop 330 kW at 6000 rev/min.
Environmental emission analysis of the engine using Botryococcus braunii marine algae with CeO2 nanoparticle additives
Published in Journal of Experimental Nanoscience, 2023
S. Karthikeyan, T. Dharmaprabhakaran, Ekrem Yanmaz, Sana Sulaiman Hamid, T. Bothichandar
The dynamometer is used to measure the torque and speed generated by the engine and to regulate the engine load. This allows the engine to be tested under various conditions and helps to identify any issues with the engine performance [32]. The dynamometer is connected to the engine and the engine is then run at a variety of speeds, loads, and temperatures. The data collected from the dynamometer is used to generate a graph of the engine’s performance, which can then be used to identify any potential problems or areas for improvement. All of these devices are connected to your computer [1, 34–36]. This allows technicians to monitor the engine’s performance in real-time, so they can take immediate action if any issues arise. The data collected can also be used to create more accurate models and simulations of the engine, which can be used to optimise its design and performance. This combination of components allows the user to monitor the fuel and air flow in the system, as well as measure the fuel and air pressure, in order to ensure the engine is running optimally and efficiently [36–38] All of these readings are taken in real time, allowing the user to make adjustments to the fuel and air flow as needed in order to keep the engine running at peak performance. The readings also provide data that can be used to diagnose and troubleshoot any potential issues with the engine.
Pool boiling heat transfer of water and nanofluid outside the surface with higher roughness and different wettability
Published in Nanoscale and Microscale Thermophysical Engineering, 2018
Wen-Tao Ji, Peng-Fei Zhao, Chuang-Yao Zhao, Jing Ding, Wen-Quan Tao
The experimental test apparatus was designed to carry out pool boiling heat transfer experiment at the atmospheric pressure (Figure 1). It mainly consists of the vessel, test sample, electric heating, condensing, and data acquisition system. The vessel for boiling has the internal diameter of 300 mm and 505 mm in height. The wall thickness is 6 mm. The vessel is well insulated with rubber plastic (60 mm) and aluminum foil to prevent the heat loss. Two sight glasses with diameter of 80 mm are configured in the vessel to observe the boiling process. The test sample is a copper block, which has the dimension of 100 mm × 50 mm × 70 mm (length × width × height). The top of the sample is the surface for modification and boiling, and the bottom is in contact with the electric heater with thermal grease. The bottom of copper sample is located in just the middle of the electricity heating block. The other surfaces are wrapped with insulating materials to prevent heat loss from the bottom to top. The insulating materials include high temperature resistant (up to 250 °C) epoxy resin adhesive (10 mm thick) and polytetrafluoroethylene tapes (at least 20 mm). Underneath of the test sample is the electrical heating plate. The size of the plate heater is 150 mm (long) × 150 mm (width) × 15 mm (height). The heating power can be regulated from 0 to 2 kW. The power can be measured by dynamometer with accuracy of 0.5%. Two auxiliary heaters with maximum power of 2kW are also fixed in the vessel, which are used to promote the pool boiling to reach the saturate state. When the liquid in the vessel reaches the saturate state, it will be turned off. A supporting plate is configured between electric heater and vessel.