JPH0455985A - Support system for fluid related circuit development - Google Patents

Abstract

PURPOSE:To freely and easily enable designation at the arbitrary point of an output point by designating the output point in a fluid related circuit for the solution to be outputted in a post-processing part on the fluid related circuit diagram in a pre-processing part. CONSTITUTION:A general model formula corresponding to the entire fluid related circuit is designated in a hydraulic related circuit diagram to be prepared in a pre-processing part 1 at a stage before structure. A specified variable is turned to be the one equipped with the attribute as an output point in the pre-processing part 1 by this designation. This is processed while combined in the general model formula equipped with the discrimination index when the general model formula equipped with the discrimination index when the general model formula is constructed in an analysis part 2. Thus, the designated position of this output point can be freely selected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid-related circuit development support system used for designing fluid-related circuits such as hydraulic circuits and verifying their behavior.

[Conventional technology]

Conventionally, in the design of this type of fluid-related circuit, a designer creates a fluid-related circuit diagram using a CAD system, creates a numerical simulation program based on this circuit diagram, and solves this program. Therefore, methods have been taken to investigate the behavior of this fluid-related circuit.

In these simulation programs, the entire fluid-related circuit is targeted from the beginning of its creation, and variables are displayed according to the preferences of the program creator, and the output of a specific part of the fluid-related circuit can be obtained. In case,
The output point was specified by specifying one of these variables.

[Problem to be solved by the invention]

However, in recent years, the configurations of fluid-related circuits that are subject to consideration have become more complex, and the fluid operations thereof have also become more complex, making it increasingly difficult to easily predict the behavior of the fluid in the circuit and the equipment associated with it. There is. Under these circumstances, symbol diagrams corresponding to various elements as fluid-related equipment and model formulas showing the relationship between the input to the element and the state quantity of the element as the output from the element have been registered. a pre-processing unit that combines the symbol diagrams to create a fluid-related circuit diagram in order to obtain a desired fluid-related operation; and a pre-processing unit that creates a fluid-related circuit diagram from the library unit based on the fluid-related circuit diagram. an analysis section that calls each model equation corresponding to the above, automatically generates an integrated model equation corresponding to the entire fluid-related circuit, and solves the integrated model equation according to the input conditions; A fluid-related circuit development support system has been proposed that includes a post-processing section that outputs a solution.

Even when such a method is used, in the conventional method, an overall model equation for the entire system is automatically generated, an output point must be specified, and a variable corresponding to this point must be found and output. In this way, when the configuration of the fluid-related circuit is complex, the task of specifying variables at the output point becomes increasingly difficult as the number of elements increases.

Furthermore, as the system under consideration becomes more complex, it becomes more difficult to predict the fluid operation within this system, and as a result, it may not be possible to understand the operation of the circuit based only on the initially planned output points.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a fluid-related circuit development support system that allows output points to be freely and easily specified at any point in a fluid-related circuit. .

[Means to solve the problem]

To achieve this objective, the fluid-related circuit development support system according to the present invention specifies an output point in the fluid-related circuit for the solution output by the post-processing section in the above-mentioned proposed fluid-related circuit support system. but,
It is characterized by being configured so that it can be freely configured on the fluid-related circuit diagram in the pre-processing section.

[For production]

With such a configuration, the hydraulic pressure-related circuit diagram is specified in the hydraulic-related circuit diagram created in the preprocessing section at a stage before the comprehensive model formula corresponding to the entire fluid-related circuit is constructed. This designation causes a specific variable to have an attribute as an output point in the preprocessing section. When the comprehensive model formula is constructed in the analysis section, this is incorporated into the comprehensive model formula and processed, with the above-mentioned identification index included. Furthermore, the designated position of this output point is configured to be freely selectable.

Therefore, in this support system, the processing of the analysis section and post-processing section is completely entrusted to the computer side, making it possible to proceed with the processing.

〔Effect of the invention〕

By using the configuration shown in 2, it is possible to specify the output point without waiting until the completion of the overall model formula construction as in the past, and when designing and verifying hydraulic-related circuits that are constructed by combining a large number of elements. However, it has become more convenient to use a support system that can respond automatically.

Furthermore, in the above configuration, even if a critical problem occurs in a certain circuit part in the circuit design, an output point can be freely set at the problematic part and used as a reference for changing the design of that part. becomes possible.

〔Example〕

Embodiments of the present application will be described below based on the drawings.

First, an outline of the hydraulic circuit development support system of the present application will be explained based on FIG. 1. As shown in the diagram, this system has four main parts (preprocessing section (1), analysis section (2)
, a post-processing section (3), and a library section (4)).

To explain the functions of each part, first, the preprocessing part (1) is a part used mainly for creating a hydraulic circuit diagram (5) intended by the user of this system, that is, a CAD means, and , creation of a symbol diagram (6) for each element used in this hydraulic related circuit diagram (5), and creation of a model formula (e1) for the model associated with this,
This is the part that also makes changes. Here, the symbol diagram (6) refers to the high-speed response valve (
15), relief valves (18), etc. (elements) are expressed schematically in order to show them on the circuit diagram, and the model formula (e I) is Correspondingly, it is a mathematical representation of how these circuit elements work.

Next, the function of the analysis section (2) will be explained. This analysis section (2) is a section that automatically generates an overall model equation (E1) for the hydraulic circuit that has already been created based on the hydraulic circuit diagram (5) created by the preprocessing section (1). be. In the operation at this part (2), it is naturally necessary to select a model corresponding to each element, input part data for the model, input calculation conditions, etc.

The model formula (e1) registered in the library section (4) for each model corresponding to each element is
They are combined based on the created hydraulic-related circuit diagram (5). Furthermore, in this part (2), the overall model equation (E1) corresponding to this hydraulic pressure related circuit is solved according to the input conditions. This is the role of the analysis section (2). Furthermore, in the post-processing section (3), the above-mentioned analysis section (
The solution of the hydraulic pressure related circuit obtained in step 2) is output as a dynamic characteristic chart (8). Furthermore, this support system is configured to output a bill of materials (not shown) for parts used in this circuit based on the model selected for each element.

The flow of processing in each of the above-mentioned sections (1), (2), (3), and (4) is shown in FIG.

The general configuration of the system of the present application is as described above, or the configuration of the hydraulic circuit development support system of the present application is based on an example of using this for a hydraulic circuit for lifting and lowering operations of a three-point linkage mechanism. The functions will be explained step by step. FIG. 3 shows a mechanical schematic diagram of this system, and FIG. 4 shows a hydraulic circuit diagram of this system.

First, FIG. 3 will be explained. This work vehicle (10) is equipped with the aforementioned three-point linkage mechanism (11) at its rear.
A working device (Ila) such as a rotary is operated up and down by this three-point linkage mechanism (11). Here, this three-point linkage mechanism (11) is a hydraulic cylinder (12)
Driven by. Pressure oil is supplied to the hydraulic cylinder (12) by a pump (14) mechanically connected to the engine (13). Furthermore, the circuit from this pump (14) to the hydraulic cylinder (12) is provided with a high-speed response valve (15) as a lift switching valve and a falling speed control valve (16) as a flow rate control valve. . In the example of the present application, this high-speed response valve (15) is for controlling the opening and closing of the high-speed response valve (15) in response to a control command from a PID control unit (17) serving as a control means. The falling speed regulating valve (16) is for preventing a sudden descent during a descending operation of the working device. This PID control section (17) controls the three-point linkage mechanism (
11) is obtained as control information. Furthermore, a relief valve (18) is provided in this circuit.

Users of the support system of the present application should keep in mind the hardware system described above, or while referring to reference drawings,
A hydraulic circuit diagram (5) for this hardware system is created in the preprocessing section (1) described above. This method is similar to traditional CA
This is the same as that used in the D system. FIG. 4 shows a hydraulic circuit diagram (5) created in this manner. In this figure, corresponding elements are labeled with the same numbers. At the same time as this operation, in this support system, the designer can select the part (
A flag (called a measuring instrument symbol) as shown in FIG. 4 is set on the node). Each of these flags requests an output from a portion of the circuit where the flag is set. Here, each flag is attached with an identification mark of the physical quantity to be output.

The target physical quantities are fluid pressure and flow rate for fluid systems, and displacement, velocity, and linear motion for mechanical systems.
For acceleration, force, and rotational motion, angle, angular velocity, angular acceleration, and torque are covered, and for electrical systems, voltage and current are covered. For each of these physical quantities, there are flags (called instrument symbols) that symbolize the physical quantities ([F] (fluid pressure), Q (flow rate), ■ (current).

■ (displacement), ■ (angle), etc.) can be erected.

This hydraulic-related circuit diagram (5) will be created using a CAD system, but in the example of this application, each element includes a hydraulic system element, an engine (13), a three-point link mechanism (11), etc. The hydraulic circuit diagram (5) includes mechanical elements such as the above, and electrical elements such as the PID control section (17). That is, in this support system,
Relief valves (18L high-speed response valve (15), falling speed adjustment valve (16), hydraulic cylinder (12) and each pipe line (p
) In addition to hydraulic system elements such as engine (13)
, three-point linkage mechanism (11), and PID control section (17)
Mechanical and electrical elements such as these are included in the study, and the behavior of hydraulic circuits is studied.

Now, the hydraulic circuit diagram (5) obtained as above
A method for creating an integrated model equation (E1) corresponding to this circuit diagram from the following will be described below. As mentioned above, this system is equipped with a library part (4), and this part (4) stores model formulas (e
1) is registered. In this model formula (e1), the input (external variable) system and output (state variable) system for each model are defined, and the conditions that determine the properties of the model itself (patency constant, calculation constant)
The structure has a system. For example, in the above-mentioned high-speed response valve (15), the input system is the valve inlet (151L first, second, third outlet (1501)) shown in FIG.
1502) (1503), the first current signal (I 1) to the first solenoid valve (V1), the second current signal (■2) to the second solenoid valve (V2), and the output system is: Valve inlet (15
1), first, second, third valve outlet (1501) (1502
) (1503). Examples of conditions include relief setting pressure and the like. Each pipe (p
), the input system is the flow rate at the pipe inlet and outlet,
The output system is the pressure at the inlet and outlet of the pipe, and the condition system is the diameter and length of each pipe (p) itself. When the physical quantities of mechanical elements and electrical elements are targeted as in this application, the physical quantities of mechanical elements include acting force, load torque,
Position, velocity, acceleration, angular velocity, and angular acceleration are considered, and physical quantities of electrical elements include current value,
The configuration is such that voltage values and the like are taken into account.

Now, for elements with different functions, their symbol diagrams, the corresponding models that can be selected and their model formulas (e1), and the inputs, outputs, and A system of conditions is definitely stored in said library part (4). That is, in this system, each symbol diagram is associated with a model formula (e1) determined as a result of model selection. In this application, since the program is created using the FORTRAN language TR, the model formula (e1) is written in a subroutine format, and the input/output system is written as a group of arguments in the subroutine. In this model formula (e1), an argument group or its processing method is defined. Further, as described above, a representative model is prepared corresponding to each element, and the model equation (e1) of this model can be modified if necessary.

An example of the configuration of the model formula (e1) of the mechanical element and the electrical element in the present application will be introduced below. For the engine (13) as a mechanical element, the model equation is configured to output the engine rotation speed,
It is configured to linearly interpolate the model data regarding the engine rotation given in advance in the time domain to output the rotation speed at a desired time. Based on the rotation speed and other conditions (fluid system conditions) delivered from the engine, the pump outputs its suction pressure and discharge pressure. On the other hand, electric system elements will be explained using the PID control section (17) as an example.

This PrD#I control section (17) detects the lift arm angle from the three-point linkage mechanism, calculates the current off time to the high-speed response valve (15), and calculates the output current value if the current time is the on time. calculate.

The formula for calculating the current off time is constructed as follows.

dTo f f (n)=Kp*dEV (n)+K
i *EV (n) + Kd*d 2EV (n) where dToff(n) is the current off time, Kp, Ki, K
d is the proportional, integral, and differential gain, V (n) is the actual lift arm speed, RV (n) is the target speed, and EV
(n), dEV (n).

d2EV(n) is written as below.

(n indicates time step.) EV (n)=V (n)-RV (n)dEV (n
)=EV (n)-EV (n-1)d 2EV (n
) = dEV (n) - dEV (n-1) The high-speed response valve (15) is configured to receive the current value from the PID control unit (17), calculate the solenoid force, and calculate the valve speed. It is being done. Furthermore, an output routine corresponding to model formula (e1) is prepared in correspondence with the above-mentioned case measuring instrument. Then, the overall model equation (E
During the automatic generation of step 1), the output routine corresponding to the measuring instrument is called.

Next, in the analysis section (2), the hydraulic pressure related circuit diagram (5
), a method for automatically generating the comprehensive model equation (E1) of the entire circuit itself will be explained. In this application, a unique technique is adopted for this automatic generation method. That is, this is the comprehensive model formula automatic generation means (20) in the present application.

FIG. 5 shows the processing flow of the integrated model formula automatic generation means (20), and will be explained based on this figure. This includes element ordering means (21) and node ordering means (
22), degree-of-freedom ordering means (23), and all of these are configured to calculate each element, each node, and overall model equation (E1) for the entire specific fluid-related circuit diagram (5) that has been created. It can be said that it is a processing means that makes it possible to identify the independent variables within by serial numbers. Here, a node is a connection point between each element.

The function of each means (21), (22), and (23) will be explained below. First of all, each element is ordered by the element ordering means (21). This ordering is performed in the order of input by CAD (approximately in accordance with the order of the flow paths of the hydraulic circuit) from the main elements to each pipe line as shown below. This example is shown below.

Element: 1 Element: 2 Element: 3 Element: 4 Element: 5 Element: 6 Motor (Engine) Gear Pump T-type Joint Fast Response Valve Relief Valve Tank (Here, the engine is treated as a motor in the system.) Next Then, the node ordering means (22) orders the nodes as connection points of each element, and at the same time, the node correspondence table (TI
) or created. This node correspondence table (TI) shows the main symbol (t] as the main element connected to each node.
), the subsymbol (t2) as an element connected to the bundled element, and the corresponding port name (t3.t4) in these elements, by node number (
This is a table corresponding to t5). At this stage, the port names (t3) (t4) of each element are displayed depending on each element. That is, for example, the inlet of an element is denoted by 1 in every element, and the outlet is likewise denoted by 2.

Further, in the present application, after the creation of the node correspondence table (T I ), the degree of freedom ordering means (23) generates the degree of freedom correspondence table (T2), and then the comprehensive model equation (E1)
is automatically generated. This method will be explained below.

In this application, the model formula (e
The argument group 1) is classified into state variables, external variables, inherent constants, calculation constants, etc. Here, the state variable is a physical quantity that the element has at each calculation step (state), and the external variable is a state variable passed from an element connected to this element. Here, of course, the state variable described above differs by the amount of the calculation process between the stage when this model formula (e 1) is called and the state when the process using this model formula (e 1) is completed. Furthermore, the above-mentioned inherent constants and calculation constants are constants used in the processing of each model formula (e1). In this application, the argument group of this model formula (e1) is described and arranged in a unique configuration. That is, each argument is one character indicating the type of variable, and the port name (up to 4 characters) of each model connected via - underscores.
Furthermore, the arguments in each model formula (e1) are classified into state variables and external variables according to the above classification, and these are arranged in order as a state variable group and an external variable group as a subroutine argument group. It is being done. An example of this is shown below.

MOTOR (W MC! state variable)! PUMP without external variables (P 1. P 2! State variable Q
1. Q2. WMC)! External variable TEE (P 1.P 2.P 3! State variable 0 1, Q 2.Q 3)! External variable DENJI (P P, P C.

! State variable D D)! External variable RELIEF (X RF, V RF, P 1゜P
2. P3. I state variable TANK Q1, Q2)! External variables (PI)! State variable PIPE (Q 1.Q 2.P LP
I, P2) Examples of motors (engines), pumps, T-type joints, high-speed response valves, relief valves, tanks, and vibrators are shown here. Taking a motor (engine) as an example, (
W MC) indicates that the type of variable is W: angular velocity, indicating that it is a variable of the MC boat. After passing through such a preparatory stage, the degrees of freedom ordering means (23) converts the overall model equation (E1) using the unified variable (Y) with degrees of freedom as parameters according to the circuit diagram (5). An overall model equation (E1) is created while defining independent variables. In this process, the above-mentioned degrees of freedom apply only to the ordered elements in the overall model equation (E1), and in the argument section of the model equation (e1) corresponding to this element, only the state variables (external variables , are not considered at first.) are determined in the order of their description. An example of this case is shown below in program form. Here, the program is created in a format that calls the model formula (e1) to the ordered elements, so
The CALL statements are written in this order.

CALL MOTOR(Y (1))! State variables! CALL PUMP without external variables (Y (2), Y (3)!
State variables Y(40), Y(43), Y(1))! External variable CALL TEE (Y (4), Y (5),
Y (6) 1 state variable Y(44), Y(46), Y(49))! External variable CALL DENJI (Y(7), Y(8),
・・! State variables..., Y(61), Y(62))! External variable CALL RERIEF (Y (26).

Y (27).

Y (50), Y (52)) CALL TANK (Y (31)) CALL
PIPE (Y(40), Y(41).

Y (42) Y(2), Y(31)) Here, first, the argument of (W MC), which is the state variable of the motor (engine), is a unified variable (Y
(1)). In the case of this motor (engine), there are no external variables, so no further operations are performed. Next, regarding the pump, its state variables (P-1, P-2) or unified variables (Y (2), Y (
3) will be replaced by ). Here, the external variable (Q-
1, Q2, and Q-3) are not yet related to the processing and cannot be replaced with unified variables.

Since the external variable of the pump (W MC) is the state variable of the motor (engine) that has the same description format and is connected at node 1, this substitution is performed (Y(1)).
It will be replaced as. For example, (Y (2)), which appears for the first time in the pump, is a vibe (Y (2)) that appears at the end of the program as an element due to the node relationship.
P I PE) is replaced by an external variable (P I). Such operations are performed throughout the entire circuit.

The above operations have been explained on a FORTRAN basis for ease of explanation, but in the present application, before such replacement operations, a table (T2) that the inventor calls a degrees of freedom correspondence table is created. This degree of freedom correspondence table (T2) is the unified variable (Y)
Types of variables (t
11) Element number (t1) identified as a state variable
2), port name (t13), and corresponding node number (t
14) is a comparison table of the element number (t l 5) and boat name (t 16) identified as external variables. As can be easily understood from this table (T2), the overall model equation (E1) is described here as a unified variable with degrees of freedom as parameters based on the specific circuit system to be considered, and a unified It is now possible to process it.

Now, regarding the output processing by the aforementioned measuring instruments, this is achieved by passing output information as shown below in correspondence to each measuring instrument.

OUT (STEP, 1) = Y (3) OUT (ST
EP, 2)=Y (7) In other words, the aforementioned comprehensive model equation (E
After generating 1), the node to which the measuring instrument symbol is attached is determined to be the physical quantity based on the measuring instrument type (corresponding to physical quantities with different properties), and the variable (Y (3).

Y (7) ) etc. are identified as output information and output. By adopting such a configuration, the preprocessing section (
After the predetermined physical quantity specified by the measuring instrument symbol (1) is processed by the analysis unit (2), it is automatically identified and output as output information corresponding to the node.

On the other hand, the initial value of the circuit is input at a predetermined step as one aspect of the above-mentioned condition system (.

In this system, the comprehensive model equation (E1) formed as described above is solved by following the time steps using the Ponge, Footer, Gill, etc. methods.

Below, a simulation result of a hydraulic circuit related to lifting and lowering a working device using the three-point link (11) described above will be explained. That is, the calculation results obtained by the analysis section (2) are output to a printer or illustrated in a post-processing section (3). Here, since printer output is a common output format, its explanation will be omitted. Figures 8(a) and 8(b) show the results of the graphical output. Here, in each drawing, the horizontal axis is time, and the vertical axis in Figure 8 (a) is pressure (left scale kgf/am2) and position (
Height) (right scale cm) is shown in Figure 8 (
In (b), the flow rate (left scale 1/m1n) and rotation speed (right scale rpm) are shown. The graphs of this output example in each drawing will be explained one by one. In Figure 8 (a), the pump discharge pressure is shown as a solid line (□), the cylinder internal pressure is shown as a dashed line (--1, ---), and the lower link height is shown as a long-dashed line (= ---). , the fast-response valve discharge pressure is shown by a single dashed line.

On the other hand, in Figure 8 (b), the pump rotation speed is the solid line (□
), the cylinder displacement is indicated by the long dashed line (-1→, the first control current (If)) or the dotted line (...
,・1. , , , ), the second control current (■2) is indicated by a - dotted chain line (-・-・−・−・→.In the lifting/lowering operation of the working device in this embodiment, this device is The problem is how to control it in a short time without overshooting or hunting, etc. In Fig. 8, 0.0 to 2.0 (sec) indicates this upward stroke (UP). It is 2.0 to 3.
0 (sec) or a downward stroke (D o wn ). Furthermore, during this upward stroke (UP), the working device is sufficiently far away from the target position and the first control current (
11) is always in the first upward stroke (UP).
I) and the second upward stroke (UP2) in which the first control current (I1) is intermittently turned on and off. Furthermore, the downward stroke (Down) also has this configuration (Down 1) (Down 2). This first ascending or descending stroke (UP I
) (Down 1), the control current (II) (1
2) Or, the pressure, flow rate, etc. are kept at a constant value and pulsate over a long period. One way, two ascending or descending strokes (UF4
) (Down2), the high-speed response valve (15) is controlled intermittently by the PID control unit (17), and the pressure, flow rate, etc. change greatly, and the cylinder displacement and lower link height are smoothly adjusted to the target value (SPI )(SF3)(L
RI) (LR2). This is just
This is because FIGS. 8(a) and 8(b) show operation diagrams when each element, P[) control conditions, etc. are set to ideal conditions.

To compare with this example, an example in which the control conditions (proportional and integral gain) are changed in PID control is shown in Figure 9 (
b) Shown in (b).

In this case, in the aforementioned second upward stroke (UF4), intense vibrations occur in the pump and cylinder internal pressure, and a hunting portion (P) occurs in the cylinder displacement itself.

[Another example]

In the above embodiment, an engine and a three-point linkage mechanism have been described as mechanical elements, but as long as they respond in a typical manner to an input system of predetermined physical quantities,
These may be of any kind. The same thing can also be said about electrical elements.

Furthermore, in the above example, the control means is based on the PID control method, but other control methods such as fuzzy control may be adopted.

In the above embodiment, for this target circuit, the PI
We have explained how the response of the system changes when the D control conditions are changed, but when designing such hydraulic circuits,
Its hard aspects (hydraulic elements, mechanical elements,
Changing the dynamic characteristics of (and electrical system elements) (changing the equipment used) is a hot topic, and by changing the circuit configuration by adding or removing new hydraulic elements, etc., the above-mentioned Therefore, it is possible to study the dynamic characteristics of hydraulic circuits.

Furthermore, in the analysis section, the degree of freedom correspondence table (T2) of this application
The overall model formula for the hydraulic related circuit (E
When solving 1), it is possible to use methods other than the pump, footer, and gill method.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings by the reference numerals.

[Brief explanation of drawings]

The drawings show an embodiment of the fluid-related circuit development support system according to the present invention, with FIG. 1 showing the main configuration of the fluid-related circuit development support system, and FIG. 2 showing the flow of processing in each main part. Fig. 3 is a diagram of the hardware system of the system to be considered in the present support system, Fig. 4 is a hydraulic circuit diagram of the system to be considered shown in Fig. 3, and Fig. 5 is a diagram of the processing of the integrated model formula automatic generation means. A diagram showing the flow, Figure 6 is a diagram of the node correspondence table, Figure 7
The figure is a diagram of the degree of freedom correspondence table, Figure 8 is a diagram of the output in the optimal operating state of the system under consideration shown in Figure 3, and Figure 9 is a diagram of the inappropriate setting of conditions for the system under consideration shown in Figure 3. It is a diagram of the output in the case. (1)...Preprocessing section, (2)...Analysis section, (3)...
・・Post-processing section, (4) ・・Library section, (5)・
... Fluid related circuit diagram, (TI) ... Node correspondence table, (T2) ... Degree of freedom correspondence table.

Claims (1)

[Claims] 1. Symbol diagrams corresponding to various elements as fluid-related equipment, model equations (e1 ) is registered, and a preprocessing unit (5) that combines the symbol diagrams to create a fluid-related circuit diagram (5) in order to obtain a desired fluid-related operation.
1) and the fluid-related circuit diagram (5), each model formula (
an analysis unit (2) that calls e1), automatically generates an overall model equation (E1) corresponding to the entire fluid-related circuit, and solves the overall model equation (E1) according to input conditions; The obtained comprehensive model equation (E
In a fluid-related circuit development support system comprising a post-processing section (3) that outputs the solution of step 1), specifying an output point in the fluid-related circuit for the solution output by the post-processing section (3). The fluid-related circuit development support system is configured such that the preprocessing section (1) can freely perform the following on the fluid-related circuit diagram (5). 2. The designation of the output point is specified in the fluid-related circuit diagram (
2. The fluid-related circuit development support system according to claim 1, wherein in step 5), a measuring instrument symbol having a physical quantity identification mark is attached to a node serving as a connection point of said element.