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38 Ship Modeler�s Tools ideas | model ship building, model ships, tools

Designing of diagrams to optimize mathematic model of the ship power plant SPP combined propulsion complexes CPC for decreasing operational loss and increasing fuel efficiency with simultaneous load limiting on medium revolutions diesel generator MRDG by criterion reducing of wear and increasing operation time between repairs. After analyzing of ship power plant model ship building tools quality control of CPC proposed diagrams to optimize mathematic model of the above mentioned complex.

The model based on using of electronic controllers in model ship building tools quality control regulation bjilding control systems for diesel and thruster which allow to actualize more complicated control algorithm with viewpoint of increasing working efficiency of ship power plant at normal and emergency modes.

Determined builsing of comparative computer modeling in MatLab Simulink for building of imitation model objects based on it block diagrams and mathematic descriptions. The function blocks of proposed complex are the main structural units which allow to investigate it normal and emergency modes. For example, the function boxes outputs of PID-regulators of MRDG depends from set excitation voltage and rotating frequency that in turn depends from power-station load and respond that is cpntrol ship moving or dynamically positioning, and come on input inputs of qualit rotating frequency PID-regulator models.

Practical value. The function blocks ofproposed complex are the main structural units which allow to investigate it normal and emergency modes. References 9, figures 6. Key words: ship power plants, combined propulsion complex, mathematical modeling, electronic controller, thruster, diesel, dynamic positioning. In recent years rowing power plants RPP are the best solutions for certain kodel of ships.

The so-called combined propulsive systems CPS with electric propulsion motors on shaft line are variable speed throughout the range of coordinates with direct control moment and powered on based on many tire designs flexible systems AC uneven distribution impedance [1, 2] which are the only ones with multiple power grids diesel-generators or turbo-generators which have found many advantages in several areas of shipbuilding.

Fuel savings, reduced maintenance costs, improved flexibility, high reliability, reduced noise and vibration -this is the main thing that marks these systems on the market today. An additional start-up costs associated with the increase in the number of components mmodel not negate these advantages, because such systems are very flexible in terms of operation, management and placement on board.

Electrical equipment also shows high efficacy in a large range of operational modes. But to take advantage of such systems today require study of existing models of RPP SPC, developing new models and management strategies, analysis and optimization of marine vessels operating in various operating conditions [3], particularly on hold position DP. Problem definition. We know that bulding power systems that have stringent requirements for voltage and frequency so that MTDG models developed from this review have no prospects for change.

They differ in power and consumption of power. Frequency converters FCthruster T and other internal load include functional blocks of the power consumption of the overall distribution of active and reactive power.

PID-controllers of MTDG, T and automatic voltage regulators AVR checked in terms of performance [5], and it turned out that it is enough for simulations that cover the main indicators of supply ship power plant SPP CPS but not enough to account degradation effects occurring on lines shaft [6, 7].

To model ship building tools quality control the above problems it is necessary, based on theoretical assumptions regarding electronic buildimg and models of heat engines and maneuvering propulsion device, design a circuit optimization mathematical SPP SPC which would allow to implement more complex control algorithms in terms of improving the efficiency of SPP for the entire range load.

The goal of the cotnrol is the development of schemes of optimization mathematical model of SPP Toolw with screw-type Azipod steering installation to reduce operating costs and improve fuel efficiency while loading restriction on the criterion MTDG reduce wear and increase turnaround time.

Power generation units. Each ER has an independent system of support mechanisms that include fuel system, air pressure and low cooling water that are able to cross-connect. Two groups of three MTDG are connected to the two main sections of tires of high voltage. Section interconnected sectional switch. From the main switchboard MSB by reducing the high voltage transformers will supply switchboards SSB of own needs and transformers for power supply to electric technology inherent in this type of vessel.

Low voltage distribution system consists of two main tires left and right sides at the main deck, which are fed from the main modeel high-voltage interconnected switches that interlocked with the transformer feeder breakers. Distribution PLC controls the functions of the engine, and the digital module synchronization and load control DSLC controls buildint timing model ship building tools quality control distribution of power.

DP system is double-redundant Fig. DP system can control up to eight engines T, as usual - to. Each ocntrol unit has an independent channel of communication with the main central control computer. As sources of tooks in handheld power plant salient-pole brushless synchronous generators SG of high voltage with diesel- or turbo-drive are used. The most convenient cnotrol of mathematical models of these machines is machines in the form of an orthogonal coordinate system d, q which is rigidly connected to the rotor.

This coordinate system has advantages over a fixed coordinate system a, b, c in which, during rotation of the rotor axis of the rotor and stator windings mutually moved because phase AC voltage, current and flux expressed in tooos variables.

Vectors voltage, current and flux in the perpendicular arranged axes d, q are constant and relatively fixed. The disadvantages of modeling in axes d, q include the inability to study asymmetric modes. In order to improve clarity and simplify the simulation results analysis more convenient to use equations in relative units. For rigid framework of fixed voltage and frequency for the MSB and SSB used for standard shkp and power factor on modular tires.

Ship power system is isolated and models presented in this article, a rotor speed SG chosen as the base, and viewing other power generators are calculated in relation to it.

The angle of the base power generator and the voltage on the tire load module is calculated according to the current generator. For each of the SG model of the 7th order is used, and the relationship between generators through quaality module that represents the overall burden as AC impedance, which makes the vector components of the load to the output current generators and voltage vector returns on tires depending on the load characteristics constant impedance, constant power.

Electric values are modeled in axes d, q. The scheme of the general structure of ttools model ship building tools quality control with input and output parameters is shown in Fig. Flowchart model ship building tools quality control the shup power plant model: z - fuel index, relative model ship building tools quality control. Developing an AVR mathematical model based on electronic PID-controller and model ship building tools quality control power semiconductor switch, consider their characteristics [9].

Appointment proportional integral differential PID controller mdel to maintain the specified value uset some input values through its comparison with the initial current value which is made by negative feedback signal ufb. The difference between these two values is called inconsistency or deviation from the set value.

The power semiconductor switch PSS of AVR serves as a key between a source of constant tension and winding brushless exciter. Model ship building tools quality control control pathogen carried by regulating the duration included disconnected state of the key semiconductor, i.

In general, the power converter is nonlinear dynamic link. Since the switching frequency is much higher than the bandwidth of the system, the power converter can also be viewed as lagless link. As a link in model ship building tools quality control system of regulation, the PSS is usually described aperiodic link or link with a delay. For normal Buildint operation must be specified limit values of the output voltage to prevent situations overexcited and under exited generator.

Block restrictions - moodel stabilizing element. The converter converts the voltage signals into digital instrument transformers, its transfer function can also be expressed in terms of aperiodic link of the first order.

The moment of the engine, sship by losses and moment resistance point generator, which prevent rotation of the shaft. Mkdel engine depends on the amount of fuel which enters it, thus regulating effect on the frequency of rotation of the motor shaft creates a regulatory body that changes the amount of fuel.

For diesel this regulatory body is rail of the high-pressure buildkng pumps HPFP. In ship MTDG producing alternating current to drive sus-tainability rotational speed of the diesel engine are presented the most stringent requirements, provided that the requirements of model ship building tools quality control to ship frequency alternating current network, so you need to support high-speed diesel drive mode with high accuracy, irrespective of changing the ship's electrical load buildingg.

For this purpose, the system of automatic speed control. Currently, the ships model ship building tools quality control the old buildings are used in mechanical and hydrome-chanical regulators rotational speed diesel engines that have proven to be reliable working regulating device. However, the functionality of these controllers are limited, therefore improving modern automatic control systems ACS and systems of automatic control SAC ship diesel engines is moving towards the use of electronic controls based on microprocessor.

With the use of electronic controls in ACS and SAC diesel engine provided a new, higher level, allowing you to implement more complex control algorithms diesel and provide previously unattainable performance quality of the regulation of its speed. A prerequisite for this process. Quaoity the structure of regulatory law and regulation is determined by several factors. In addition, you must also add the block, describing servomechanism HPFP rails, as which mkdel be used executive electric and electrohydraulic units.

In this model ship building tools quality control, the most convenient is to describe this item using aperiodic links of the first order. The very same diesel engine hsip some delay after repositioning rail fuel pump to a corresponding change in the frequency of rotation of its shaft is connected with the time on the course of chemical processes inside the combustion chamber, contgol well as the inertia of mechanical assemblies.

Because it is most preferably diesel seems like pure link delay. Results of investigations. Structural Wooden Model Ship Building Tools 4d models of electronic AVR and regulator speed diesel according to Fig. The modeling will be done in MatLab Simulink, and, given the results of studies, dependence and transfer functions control speed T [5] operating in different modes that correspond quakity a particular operating toolw of the ship in general, try to get the graphics speed shaft T and power consumption as a function of time and confirm the adequacy contol mathematical buildding.

For example, according to the block diagram in Fig. The total installed capacity is 40 MW, while T capacity of 3x2. The maximum speed for azimuth thrusters RPM but in the scheme of the line of shafts are present lowering transmission between the engines and propellers of fixed pitch PFP but measurements taken directly from the line of shafts via inductive sensors that provide signals of qualiry speed to DP-controller.

Simulations using the strategy of vector control and direct control point and power, as described in [5], and flowcharts shown in Fig. The simulation results are compared with field measurements mode, type vessels Supply vessel which performs dynamic positioning.

To measure the ship were only available mechanical power T, so the graphs depict modulated depending on electricity consumption and power loss in induction motors T.

Temporary delays in the registration of measurement data can be buulding by. MTDG and T. In other cases, of course, affect the results of tuning con. Mpdel control loops T torque, flux and current are set out as the biggest gain in order to explore the process performance in regulating torque while maintaining the value stream as close to the nominal value Tools Needed For Model Ship Building Quality for different load conditions.

Appropriateness of comparative computer simulation in MatLab Simulink to build simulation models of objects based on their block diagrams and mathematical descriptions is defined.

The functional blocks of the proposed complex are basic structural units of RPP SPC models allowing them to investigate the normal model ship building tools quality control emergency operation modes. The method can be used to preselect the parameters of modern electronic controls. There will also be performed computer simulations of processes in the RPP SPC with different types of T at: the change of frequency of T model ship building tools quality control the reverse; dynamic changes of emphasis propellers; failure of contrll T; changes of rowing propellers torque.

The obtained results should reveal characteristic changes of basic parameters of RPP SPC at the relevant operation modes that will permit to consider investigated models adequate to real objects. Woud H. Design of propulsion and electric power generation systems.

Budashko V. Improving management system combined thruster propulsion systems. Mathematical principles of simulation of power plant's control system at drillship. Bulletin of Kamchatka State Technical University,buidling. Hansen J.

Modelling and control of model ship building tools quality control power systems. Doktor ingenier thesis, Trondheim, Norway, Mathematic builving of tolls controllers speed of model ship building tools quality control for ship power plants in combined propulsion complexes.

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