Method for evaluating acoustical quality of ship and warship mechanical system according to effective power

Abstract

The invention provides a method for evaluating the acoustical quality of a ship and warship mechanical system according to effective power. The method for evaluating the acoustical quality of the ship and warship mechanical system according to the effective power comprises the following steps that firstly, the ratio KN of the effective power WN and the total power W of the ship and warship mechanical system is calculated; secondly, whether the ratio KN is larger than a set threshold value K or not is judged, if yes, it is determined that the acoustical quality of the ship and warship mechanism system can meet the design requirements, and if not, it is determined that the acoustical quality of the ship and warship mechanism system cannot meet the design requirements, the method is ended. According to the method for evaluating the acoustical quality of the ship and warship mechanical system according to the effective power, the acoustical quality of the ship and warship mechanical system is evaluated according to the ratio of the effective power to the total power, and the method is suitable for the schematic design phase of the ship and warship mechanical system. The method for evaluating the acoustical quality of the ship and warship mechanical system according to the effective power is used for evaluation of the designed acoustical quality of a ship and warship mechanical system scheme and is simple and good in operability.

Description

technical field

[0001] The invention belongs to the technical field of ship vibration reduction and noise reduction, and in particular relates to a method for evaluating the acoustic quality of a ship mechanical system based on effective power. Background technique

[0002] The mechanical system scheme should be selected in the early design stage of engineering equipment, not only its performance, strength, and operation factors, but also its acoustic factors should be considered. Due to the constraints on the functional use of the systems and the requirements placed on them in terms of strength, survivability and reliability, these schemes often vary in the complexity of construction, which leads to a series of factors in the high noise pipeline transmission system appear.

[0003] The design of the mechanical system is affected by the following conditions, and a certain margin is usually added when designing the pipeline transmission system:

[0004] 1) Hydraulic resista...

Examples

example 1

[0063] The following uses the efficiency parameter K of the pipeline transmission system N and B S , to specifically evaluate the acoustic quality of a typical ship cooling system.

[0064] Assuming that all consumers of the cooling system are connected in parallel, they are located between the inlet and outlet main lines, in which case the main lines act as collectors, each of which is kept at constant pressure. For simplicity, a water cooling system for two consumers is studied, the original functional scheme of this cooling system is shown in Figure 4 As shown, the nominal diameter of the transmission pipe supplying cooling water to each consumer is D y 100mm. The first consumer takes 25m under normal function 3 / h, its pressure loss is 5×10 4 Pa (5m water column), the second consumer also needs 25m 3 / h, but its head loss is 2×10 5 Pa (20m water column), the initial function scheme of the system is as follows image 3 .

[0065] In order to guarantee these parame...

technical field

[0001] The invention belongs to the technical field of ship vibration reduction and noise reduction, and in particular relates to a method for evaluating the acoustic quality of a ship mechanical system based on effective power. Background technique

[0002] The mechanical system scheme should be selected in the early design stage of engineering equipment, not only its performance, strength, and operation factors, but also its acoustic factors should be considered. Due to the constraints on the functional use of the systems and the requirements placed on them in terms of strength, survivability and reliability, these schemes often vary in the complexity of construction, which leads to a series of factors in the high noise pipeline transmission system appear.

[0003] The design of the mechanical system is affected by the following conditions, and a certain margin is usually added when designing the pipeline transmission system:

[0004] 1) Hydraulic resista...

Examples

example 1

[0063] The following uses the efficiency parameter K of the pipeline transmission system N and B S , to specifically evaluate the acoustic quality of a typical ship cooling system.

[0064] Assuming that all consumers of the cooling system are connected in parallel, they are located between the inlet and outlet main lines, in which case the main lines act as collectors, each of which is kept at constant pressure. For simplicity, a water cooling system for two consumers is studied, the original functional scheme of this cooling system is shown in Figure 4 As shown, the nominal diameter of the transmission pipe supplying cooling water to each consumer is D y 100mm. The first consumer takes 25m under normal function 3 / h, its pressure loss is 5×10 4 Pa (5m water column), the second consumer also needs 25m 3 / h, but its head loss is 2×10 5 Pa (20m water column), the initial function scheme of the system is as follows image 3 .

[0065] In order to guarantee these parame...

Images