which is supported on bearings housed in the test gear set box. A slot is cut on the drum to hook the free end of the spiral springs. The other end of the second piece of shaft carries the test gear fastened by means of a key.We characterized the dynamic behavior of a pair of high performance aeronautical gears which are part of a complex transmission system. The gear pair was tested using a mechanical recirculating power test rig designed to simulate the severe operating conditions of transmitted torque and angular speed. The test rig and the most important phenomena that influence its dynamic behavior are described.frequency behavior of spur gears Shuting Li [20] used a power circulating test rig was used. Rubber couplings were used to avoid the effect of vibration signals from motor and shaft. Construction of this test rig is shown in Fig.5. Fig. 2. Test rig for investigating gear noise emission [10] Fig. 3. Test rig for investigating gear noise [14]The mechanical power re-circulating gear test rig also called four square gear test rig is the most preferred test rig because of the low power requirement just to overcome the frictional losses and windage losses in running condition [8-9]. The test rig can run at high efficiency most of the time.Power re-circulating gear test rig. (a) The test rig. (b) Two-dimensional scheme and general layout (not to scale). The rig is instrumented to measure and record several quantities. The torque transferred by the tested gears is redundantly measured on each of …Some examples of test rigs Back-to-back (power recirculating) gear test rigs. These rigs are in both 91.5mm and 160mm centre distance. In house,
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