CB* 3256-1985 Vibration Rating of Marine Diesel Engines CB*3256-1985 Standard download decompression password: www.bzxz.net

National Ship Standardization Technical Committee Professional Standard CB*3256—85
Vibration Rating of Marine Diesel Engines
Published on June 16, 1985
Implemented on October 20, 1986
National Ship Standardization Technical Committee Professional Standard Vibration Rating of Marine Diesel Engines
CB*3256--85
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This standard specifies the vibration rating of marine medium and high-speed diesel engines when running on the test bench. If the above diesel engine is running on the actual ship and on the test bench, this standard can be used as a reference for vibration rating. Definition of equivalent vibration intensity
This standard adopts the equivalent vibration intensity of the whole machine as the evaluation value, which is defined as follows; V=)*+()+()
V. Equivalent vibration intensity, mm/s:
Where:
VxVyV,-
are the effective values ​​of vibration velocity in the three directions of x, y, z, respectively, mm/s; V,, and V, are the number of measuring points in the three directions of x, y, z, respectively. The measurement of V, V, and V, values ​​shall be carried out in accordance with the provisions of CB*3154-83 "Vibration Measurement Method for Marine Diesel Engines". 2 Classification of diesel engine support conditions
When evaluating the vibration quality of diesel engines, the following support conditions can be selected as needed: a. Diesel engine without vibration isolation: the diesel engine is directly installed on the base, b. Diesel engine with vibration isolation: the diesel engine is installed on the base through a specific elastic element (shock absorber), and the elastic element used must be a component that is normally used with the engine. 8 Classification and evaluation of vibration values ​​
According to the maximum equivalent vibration severity V measured under the specified working conditions, the diesel engine engine dynamic quality is divided into A, B, C, and D grades. Grade A is: excellent working condition,
Grade B is: good working condition;
Grade C is: tolerable working condition,
Grade D is: unqualified working condition
The equivalent vibration severity value V of each grade is specified in the following table: National Ship Standardization Technical Committee 1985-06-16 Implementation 198610-20
Equivalent vibration severity level
Additional explanation,
CB*3256—85
Diesel engine without vibration isolation
Diesel engine with vibration isolation
The definition of "equivalent vibration severity" in this standard refers to IS03945 (1978) "Mechanical vibration of large rotating machines with a speed of 10 to 200 r/s - Measurement and evaluation of vibration severity" and ISO2372 (1974) "Mechanical vibration of machines with a speed of 10 to 200 r/s - Description of evaluation standards", and the classification of equivalent vibration severity and the classification method of diesel engine vibration quality level are directly taken from the above two international standards.
This standard was proposed by the Marine Diesel Engine Subcommittee and is under the jurisdiction of the 711 Institute. This standard was drafted by the 711 Institute. The drafter of this standard is He Ji Zeng.
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