Control unit for vessel's diesel power plant

FIELD: transport; shipbuilding.

SUBSTANCE: device contains magnetoelastic torque transducer consisting of two magnetoelastic converters located at opposite sides of propeller shaft and made with test coils. Transducer is capable of measuring mechanical stress caused by torsional oscillations and constant component of torque. There is compensation circuit of zero signal and automated remote control system for main engine of vessel's power plant. Apart from it, device has synchronous detector, lower frequencies filter, upper frequencies filter, and threshold devices.

EFFECT: increase of reliability and efficiency of vessel's power plant at expense of prevention of operation of diesel in sphere of mechanical stress from torsional oscillations exceeding preset value and its protection from overload.

1 dwg

 

The invention relates to shipbuilding, in particular to systems for remote automated control (DAU) ship power plants (SPP). The purpose of the invention is to enhance reliability and efficiency of power plants.

High economic and energy indicators of diesel engines medium and high power led to their wide distribution in ship power plants (SPP).

Due to their design, diesel is the most powerful agent of torsional vibrations in the engine - propeller shaft - propeller.

In the case of resonant torsional oscillation amplitude variable mechanical stresses in the elements of shafting may exceed the rated value 5-7 times [1].

In practice, the exploitation of rare cases of breakage of the shafts under the action of torsional vibrations.

The main effect of torsional vibrations have on the reliability and durability of the nodes associated with the shafting: timing chain and gears, camshafts, Motulevich and head bearings, elastic couplings, etc.

Damage due to torsional vibrations, reduce the reliability of marine power plant, increase operating costs and threaten the safety of navigation.

A significant part of the energy installations of modern vessels has forbidden the AOR is s speed for continuous operation.

In kN. auth. Timofeev J.K. management System of the ship's energy processes. - SPb.: Shipbuilding, 1994., the described system, remote automatic control (DAU) main engines SAU: FAHM-S, FAMP-M, FAMP-S firm ASEA (Sweden), Geamot 90C company SYSTEMTECHNIK NORD (Germany), which provided the device is not allowing to work in the area of critical rotation frequency [2].

In addition, DOW has a device that protects diesel overload. The load of the diesel engine is determined indirectly by the position restricting fuel pumps.

Critical speed is calculated and checked during the tests of power plants.

The increasing power and complexity of power plants leads to the appearance of resonant torsional vibrations in the frequency range of rotation [3].

On vessels with controllable pitch propeller (CPP) the occurrence of torsional vibrations depends on the load of internal combustion engine power plants [4].

The most heavily torsional vibrations occur when the minimum value of the average torque.

In this mode of operation of the mechanical stress from the torsional vibrations, changing its sign, significantly exceeds the voltage from the average torque.

With increasing angle of rotation of the blades CPP reduces mechanical stresses due to torsional vibrations.

At large angles of rotation love the TEI CPP mechanical stress from torsional vibrations disappear.

The appearance and disappearance of the torsional vibrations caused by load changes occur at a constant frequency of rotation of the propeller shaft.

To prevent operation of power plants with high values of mechanical stresses due to torsional vibrations, and protect diesel overload encouraged to use the magnetoelastic torque sensor.

1. Copyright certificate №669231. Bulletin No. 23. 25.06.79. Device for measuring torque on a rotating shaft. The Zhadobin N.E. and other

2. Copyright certificate №1229612. Bulletin No. 17. 07.05.86. Device for measuring torque and power of the power unit. The Zhadobin N.E. and other

3. Copyright certificate №1527521. Bulletin No. 45. 07.12.89. Device for measuring characteristics of the ship power plant. The Zhadobin N.E. and other

Device for control of the ship power plant contains a magnetoelastic torque sensor, consisting of two cross-magnetoelastic transducers 1, 2; located on two opposite sides of the shaft.

The output signal of a magnetoelastic torque sensor, taken from two series-connected measuring windings cross magnetoelastic transducers, through the compensation scheme of the zero signal 3 is supplied to the lowpass filter 4, designed the La allocation of the first harmonic component.

The low pass filter 4 is connected to a synchronous detector 5, which responds to the change of sign of the mechanical stresses due to torsional vibrations.

The output signal of the synchronous detector is applied to a second low pass filter 6, which serves to highlight the envelope amplitude of the output signal of the magnetoelastic torque sensor. To the output of the lowpass filter connected: the high-pass filter 7 and the third low pass filter 8, which serves to highlight the average mechanical stresses.

To the output of the high-pass filter 7 is connected to the fourth low pass filter 9, the output of which is proportional to the mechanical stresses due to torsional vibrations.

The outputs of low-pass filters 8 and 9 are connected to the corresponding threshold devices 10 and 11.

If excess mechanical stress from the torsional vibrations of the setpoint threshold device 11 changes its state, feeding the signal into the system DAU 12.

Similarly, if excess mechanical stress from the average torque setpoint threshold device 10 changes its state, feeding the signal into the system DAU 12.

Thus, the proposed device allows you to protect diesel EMS from work in the field of mechanical stresses due to torsional vibrations, previousinstance value and to protect it from overload.

Structural diagram of the device shown in the drawing

Literature

1. Geebhatia, Muevelo, Whitemore. Analysis of existing calculation methods, and ways of measuring torsional vibrations of ship shafting and tendencies of their improvements. RMRS NTS No. 23, St. Petersburg., 2000.

2. Uchimiya. The control system of ship power plants. - SPb.: Shipbuilding, 1994.

3. Aguguri, Usersi. Torsional vibrations and reliability of ship shafting. - M.: Transport, 1982.

4. Neadon. Magnetoelastic transducers in ship automation. - Leningrad: Sudostroenie, 1985.

Device for control of the ship energy installation comprising a magnetoelastic torque sensor, consisting of two cross-magnetoelastic transducers located on opposite sides of the propeller shaft and measuring windings, a compensation circuit of the zero signal, the system remote automated control of the main engine of the ship power plant, characterized in that it introduced a synchronous detector, low pass filters, high-pass filter and a threshold device, and magnetoelastic torque sensor configured to measure mechanical stresses due to torsional vibrations and and constant component of torque moreover, the measuring winding cross-magnetoelastic transducers magnetoelastic torque sensor connected in series and through a compensation circuit of the zero signal and the first low pass filter connected to the input of the synchronous detector, configured to respond to a change of sign of the mechanical stresses due to torsional vibrations, the output of the synchronous detector connected to the input of the second low pass filter, configured to allocate the envelope amplitude of the output signal of the magnetoelastic torque sensor, the output of the second lowpass filter connected to the input of the high-pass filter, configured to allocate the variable component of the mechanical stresses due to torsional vibrations, the output of high-pass filter connected to the input of the third filter bottom frequencies made with the possibility of averaging the variable component of the mechanical stresses due to torsional vibrations, the output of the third low pass filter connected to the input of the first threshold device, is arranged to signal to the system remote automated control in excess of a predetermined value of mechanical stress from the torsional vibrations, the output of the second lowpass filter connected to the fourth input f is ltra lower frequencies, made with the possibility of allocation component of the mechanical stress from the constant component of the torque, the output of the fourth low pass filter connected to the input of the second threshold device, is arranged to signal to the system remote automated control in excess of a predetermined value of mechanical stress from the average torque.



 

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