Salamatov Y.

 

1. Common definition of ideality.

Producible technical systems (TS) are points for construction of a curve of a change of ideality in development of given of TS. Each TS has the level of ideality. Till now in TRIZ spoke only about that as far as "less" or "more" ideality in given of TS. It is necessary to find a quantity indicator for definition of ideality.

TS is a structure which is characterized by some sum of the constructive, energetic, technological parameters, intended for realization of the defined main useful function (MUF) or the sum of functions (∑F).

Also any technical structure represents some sum of expenses (payment for appearance of useful functions) - weight, sizes, consumed energy (WSE)

Let's remind ideality (generally) of the TS is defined as the ratio:

 

                             (1)

Than numerator there is more and the less denominator, the is more ideality.

But how to use this formula at a solution of problems and/or purposeful development of systems?

 

2. What should be an index of ideality.

The index of ideality should be dimensionless magnitude. It is necessary for objective comparison of the different TS, fulfilling same MUF, or for comparison of any TS among themselves: which TS the idealest?

Expression for a dimensionless index may be obtained only as the equation homogeneous concerning dimensionality (Buckingham's theorem: If any equation is homogeneous concerning dimensionality it can be transformed to a relation containing a complex of dimensionless combinations of magnitudes)

The equation is uniform concerning dimensionality if its form does not depend on choice of units (for example is uniform, i.e. does not depend on a choice of a dial of measurement of temperature - Celsius, Kelvin etc.)[1].

For correct use of the analysis of dimensionality it is necessary to know character and amount of the fundamental variables chosen for definition of ideality given of TS.

Any magnitude can be named fundamental variable - if it influence on ideality and capable to vary irrespective of other variables. As against them controlled variables vary with a vary of other variables.

Indexes of costs (WSE) - all three magnitudes are fundamental.

Correctly it is necessary to choose MUF (that it was fundamental magnitudes).

 

3. Definition of MUF.

For correct definition MUF it is necessary to make the enumeration of all useful properties of the TS for the sake of which it and was created.

What properties of the TS to include in structure of useful functions?

The system should be described full: all key parameters (properties) distinguishing given of TS from any other same of class, should be included in the list.

Example. We shall define MUF (∑F) for car.

What properties characterize and distinguish the TS - car from other automobiles (lorry, sports automobile etc.)?

1. Distance on which the person will be displaced.

But if to take only this parameter under it will approach cross-country vehicle with the big petrol tank better.

2. Useful carrying capacity, i.e. how many the person and what amount of a cargo may transport this car.

But if we shall take only these two parameters the lorry with the big body in the best way will approach.

3. Time of delivery of the person and a cargo for the defined distance.

But if we shall take only these three parameters in the best way will approach sports with a body.

4. Comfort (the more comfortably, than there are less than expenditures of an energy on control of the automobile - control of subsystems, a pose of the driver, softness of seats, a climate in interior, availability of the information on the automobile and an environment, presence of subsystems providing normal physiological needs),

 

These four parameters distinguish car from other types of automobiles.

 

4. Definition of ideality.

So, MUF of car - fast and comfortably to move persons and a cargo in space.

Is useful - functional parameters (it is more - the better):

1         L - distance of delivery, m

2         G - capacity, ÷ĺë., is more exact - load-carrying capacity useful, kg;

3         T -Time of delivery, seconds;

4         C - comfort, a unit of measurements - Joule-1 (i.e. this magnitude should be in a denominator):

 

Parameters of costs (it is less - the better)::

5         W - a mass, kg;

6         E - a power consumption, i.e. consumption of fuel on unit of run, L/km;

7         S - sizes (volume), m3;

 

I.e. we have seven fundamental parameters.

The common equation for ideality can be noted in the following aspect: