Yanmar Small Land Engine: Professional Test and Evaluation Helps Construction Machinery Prosperity — — (Part II: Vibration Test)

For more than 90 years，Yanmar has always been in the forefront of the industrial diesel engine field.。1933，We have developed the world's first practical small diesel engine.。Our engineers are constantly developing new technologies，To keep Yanmar moving forward.。We are committed to maintaining the existing environment，Insist on innovation，Quality is guaranteed，Ensure the safety of operators。

TNVSeries engine as a very environmentally friendly engine，Its performance specifications are developed under standard atmospheric conditions.。It must be confirmed in advance whether the engine and its applied machinery can operate normally under the given operating environment.。This confirmation is achieved through on-board installation testing.。This series of tests predicts how the data collected under standard atmospheric conditions will change under the operating environment of the machine.，And determine whether the result will adversely affect machine performance。

The engine vibration test is used to check that the machine maintains its mechanical strength under service conditions。If the criteria are not met，It needs to be improved。Test contents include engine structure strength inspection andECUVibration inspection。The engine structural strength test will check the engine feet.、DPF(Exhaust inlet side)、DPF(Exhaust outlet side)、DPFVibration acceleration of differential pressure sensor; ECUVibration inspection includesECUVibration acceleration of Vehicle body mounting part and engine support leg。Use a three-axis accelerometer to record operating data from before engine start to after engine stop，Make sure that the engine can operate normally at all speeds.。

Warm up the engine before starting the test，The engine reaches 60℃Stop preheating when above。When the machine is warmed up，Check the installation position of the equipment or other areas of the engine for the presence of oil、Water or fuel leak，It is also important to avoid irregularities caused by accidental contact with parts or vibration。Ensure that strain data and vibration data are recorded at the same time.，And set that half frequency cutoff low pass filt to alias filtering，The results of the data collected are strictly Yanmar.PSDAfter analysis and evaluation, compare the results withOEMShare，The rest of the structural strength assessment depends onOEMRequired specifications、Component configuration、Installation using open thread、PTOConfiguration, etc。

Vibration test can find and solve potential assembly problems in advance after the engine is installed.，Avoid machine damage and personal injury，It also helps to improve the service life and stability of the whole Vehicle.。

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