CN110941874B - Vehicle body combination function design method integrating Kano, QFD and FAST - Google Patents
Vehicle body combination function design method integrating Kano, QFD and FAST Download PDFInfo
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Abstract
The invention provides a vehicle body combination function design method integrating Kano, QFD and FAST. Firstly, user demands are collected, the user demands are analyzed in a layering mode through a KJ method, and user demand attributes are classified and importance degrees are determined by combining a Kano model; then, decomposing the vehicle body function by adopting a FAST method to obtain a vehicle body function structure; and finally, importing the vehicle body function structure into a 'demand-function' quality house model according to the user demand data, and establishing a matching relationship between the user demand and the vehicle body function to form a vehicle body function system diagram. The invention integrates the function design method of the baby carriage by the Kano, QFD and FAST combination method, verifies the effectiveness and rationality of the method through the design practice of the baby carriage, can effectively discover reasonable functions from the view of user demands, and adopts a combination mode to obtain the optimal design scheme.
Description
Technical Field
The invention relates to a vehicle body combination function design method integrating Kano, QFD and FAST, in particular to a combination design method of a baby carriage, and belongs to the technical field of baby carriage design.
Background
With the development of economy and society, the demands of people for travel are more and more important, and the demands for travel tools are also more and more high. In the design of baby carriages, the function is the most important feature of the carriage, which also means that the product designer needs to get a good understanding of the market situation and the needs of the user. The core of the baby carriage body design is to meet the requirements of users, however, the requirements of users are continuously changed along with the social development and the time progress, and the design method of the prior art is difficult to meet the requirements of current customers.
Disclosure of Invention
And excavating potential demands of users through a Kano model, integrating Kano and QFD quality house models, and quantitatively analyzing the demands of the users. And determining key factors influencing purchasing factors and using feelings of users by adopting a FAST functional analysis technology method. The infant car body function design combination method is provided, which takes the user requirement as a starting point and integrates a Kano model, a QFD theory and a FAST method.
The technical scheme of the invention is as follows:
a vehicle body combination function design method integrating Kano, QFD and FAST comprises the following steps:
(1) Analyzing the requirements of a vehicle body user;
from the perspective of user demand, the need for functionality of the stroller body is explored. Integrating a KJ method (card sorting method) and a Kano model to perform layering and quantitative analysis on user demands, determining importance, and establishing a user demand expansion table;
(2) Analyzing the vehicle body function structure;
decomposing the vehicle body function structure by adopting a FAST method, and establishing a matching relation between the vehicle body function and the structure by establishing a vehicle body function tree, and establishing a vehicle body function unfolding table and a vehicle body structure part unfolding table;
(3) Constructing a vehicle body function system;
the QFD quality house model is redesigned by combining the kano model and the QFD theory; and (3) importing the user demand expansion table in the step (1) and the vehicle body function expansion table in the step (2) into a model, constructing a demand-function quality house model, and ensuring one-to-one correspondence between demands and functions by supplementing and deleting vehicle body functions from the perspective of user demands and the perspective of vehicle body functions.
Preferably, the specific steps of the step (1) are as follows:
(1-1) user demand hierarchical analysis;
obtaining the user demand conditions of the baby carriage body through user investigation and access, expressing all user demands in simple and accurate language, screening and filtering, sorting to obtain three-level demand cards, sorting the obtained three-level demands again, sorting the three-level demands meeting the same demands, and sorting the user demands through a KJ method to obtain two-level demands;
(1-2), user demand attribute classification and importance determination;
(1-2-1), design and collection of Kano questionnaires;
(1-2-2) establishing a Kano quantification model by collecting and analyzing user demand data;
by designing the quantization index of the Kano model and collecting the Kano questionnaire, the user data is quantitatively analyzed, and the vehicle body function u is known for each vehicle body j To (1) to
Indicating that the vehicle body function u is not provided j Average satisfaction of the user; to->
Representative providing body function u j Average satisfaction of the user; to->
Representing the user's vehicle body function u j Average importance perception of (1), namely:
i represents the users, i.gtoreq.1, and I represents the total number of users.
Numerical coordinates (X) are marked in a two-dimensional quadrant of Kano user demand j ，Y j ) Wherein the unsatisfied value is represented by the abscissa and the satisfied value is represented by the ordinate, and then X is set j And Y j Threshold value, according to coordinate point (X j ，Y j ) The type of the user demand attribute is determined, the average satisfaction degree and the importance degree perception of the users of other vehicle body function attributes are calculated respectively, and the ordering of the average importance degree is obtained;
(1-2-3) determining a user demand attribute category;
according to the coordinate point (X j ，Y j ) In the region, kano categories corresponding to the function attributes can be obtained, and user demand attribute categories of the vehicle body functions can be obtained.
Preferably, the specific steps of the step (2) are as follows:
(2-1) decomposing a vehicle body functional structure;
analyzing user demands by using a FAST method, decomposing the handcart into four large-function systems, namely a riding function, a moving function, a protecting function and a folding function, and decomposing the handcart according to the structure of the baby carriage from top to bottom by using the FAST method to obtain other secondary functions related to basic functions and corresponding functional structures; the four functional systems are respectively as follows:
riding function
Building a FAST function tree aiming at the riding function of the handcart, wherein the riding function is taken as a basic function, and the basic function is further decomposed to obtain a secondary function: the back, buttocks and feet are supported, and the corresponding vehicle body function structure is as follows: chair back, cushion and foot pedal;
mobile function
Building a FAST function tree aiming at the mobile function of the vehicle body, wherein the mobile function is taken as a basic function, and the mobile function is further decomposed to obtain a secondary function: the steering control direction, power supply and steering are as follows: a handle, a push rod, and front and rear wheels;
protection function
Building a FAST function tree aiming at the protection function of the vehicle body, wherein the protection function is taken as a basic function, and the secondary function is further obtained through decomposition: the car body has the functions of shielding sunlight, preventing slipping and preventing leaning forward, and the corresponding car body has the following functions: sunshade, safety belt and front guard rail;
folding function
Building a FAST function tree aiming at the folding function of the trolley, wherein the folding function is taken as a basic function, and the basic function is further decomposed to obtain a secondary function: support the automobile body, fold the automobile body, dismantle the automobile body, and rather than corresponding automobile body function structure is: a frame and a folding device;
(2-2) unfolding the functions of the vehicle body;
and introducing a KJ method to perform cluster analysis on the collected user demands. The method comprises the following steps:
a. sorting the collected user demands, checking the demands, and eliminating the same similar demands to form a three-level demand project card;
b. the order of the three-level demand project cards is disordered, all cards are grouped and classified according to the internal relation among each card, and then a title is formed into a second-level demand project card according to the attribute category of each group of cards;
c. repeating the step b to classify and group the 'secondary demand item cards' upwards to form 'primary demand item cards';
d. and checking the obtained three-level card for the user demand, and deleting the first-level demand project card which does not contain the second-level demand project card or the third-level demand project card in consideration of the refinement degree of the user demand. Meanwhile, the primary demand project cards can be unfolded according to actual situation requirements to form secondary demand project cards or tertiary demand project cards.
Preferably, the specific steps of the step (3) are as follows:
(3-1) constructing a demand-functional quality house matrix model;
the method comprises the steps of establishing a demand-function quality house matrix model by combining a baby car body user demand expansion table and a baby car body function expansion table, taking the user demand expansion table as a left wall of a quality house, and taking the baby car body function expansion table as a roof; the "strong correlation", "medium correlation" and "weak correlation" are respectively represented by 5 points, 3 points and 1 point, and represent the correlation between the user demand and the function. Checking a requirement-function quality house model, analyzing at least one function corresponding to each requirement, and finally forming a functional system guided by the user requirement by checking the quality house model from different angles, supplementing necessary functions and deleting redundant functions;
(3-2) constructing a function-part quality house model;
according to the baby car body structure parts and the function-part quality house model, establishing a correlation between a target function and the car body parts, and determining which structures influence the realization of the function;
checking a quality house model to ensure that each function has corresponding parts corresponding to the quality house model;
to satisfy the newly added function, the body function structure is updated to form a new baby body part expansion table.
The beneficial effects are that: the invention integrates the vehicle body function design method of kano, QFD and FAST combination method, verifies the effectiveness and rationality of the method through the design practice of the baby carriage, expands the method to the field of other vehicle body function design, can effectively discover reasonable functions from the user demand angle, and adopts a combination mode to obtain the optimal design scheme.
Drawings
FIG. 1 is a flow chart of a method for designing a combined function of a vehicle body integrating Kano, QFD and FAST according to the present invention.
FIG. 2 is a schematic diagram of a Kano user demand model in two-dimensional quadrants of the present invention.
Fig. 3 is a schematic diagram of a FAST-building stroller body seating function tree of the present invention.
Fig. 4 illustrates a cart sitting mode of the present invention.
Fig. 5 a parent-child mode of the cart of the present invention.
Fig. 6 a lying pattern of the trolley according to the invention.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 1, a method for designing a combined function of an infant car integrating Kano, QFD and FAST includes the following steps:
step one, vehicle body user demand analysis
(1) User demand hierarchical analysis
And obtaining the user demand condition of the baby carriage body through the investigation and the access of the user. All user demands are expressed in a simple and accurate language, and then screening and filtering are carried out, so that a three-level demand card is obtained. And classifying the obtained three-level demands again, and classifying the three-level demands meeting the same demands to form two-level demands. The user demands are arranged through a KJ method, and 8 secondary demands are obtained: portability, storage, combinability, removability, foldability, pushability, sitting and lying ability, stability, and the development is as in table 1:
table 1 user demand expansion Meter for baby carriage body arranged by KJ method
(2) User demand attribute classification and importance determination
1) Design and collection of Kano questionnaires
The questions in the positive and negative directions are respectively set through 8 initial user demand items obtained through interviews, so that a Kano questionnaire is formed. The interviewee needs to make a "v" within the corresponding product attribute satisfaction "≡". As shown in Table 2, the user's satisfaction with each question is divided into five levels, namely, "satisfied", "supposed to do so", "not so-called", "tolerable", "offensive", and 4, 2, 0, -2, -4 scores are used to correspond to the user's satisfaction with each function requirement item, respectively. The importance degree for the user's demand is equally divided into five quantization levels "unimportant, general, important", and the importance degree is determined corresponding to the score of 1, 3, 5, 7, and 9, respectively, as shown in table 2.
Table 2 user demand Kano questionnaire form for baby strollers
Table 3 functional attribute importance rating table for baby strollers
2) User demand data collection analysis and establishment of Kano quantitative model
By designing the quantization index of the Kano model and collecting the Kano questionnaire, the user data is quantitatively analyzed, and the vehicle body function u is known for each vehicle body j To (1) to
Indicating that the vehicle body function u is not provided j Average satisfaction of the user; to->
Representative providing body function u j Average satisfaction of the user; to->
Representing the user's vehicle body function u j I represents users, i is 1-96, and i is the total number of users). Namely:
marking numerical coordinates in a two-dimensional quadrant graph
Wherein the unsatisfied value is represented by the abscissa and the satisfied value is represented by the ordinate, all coordinate points +.>
Will fall within the interval 0 to 4 and negative values in the result are problematic attributes and are not considered in the calculation of the average value. Then, set +.>
And->
Threshold value, which can be based on coordinate point
Is used to determine the type of user demand attribute. The total survey was given 120 questionnaires, and after the invalid questionnaires were removed, the effective questionnaires were 96. By analyzing and processing the data collected by the Kano questionnaire, corresponding values of satisfaction and importance are respectively given, and taking portable functions as an example,
using the formula
The average dissatisfaction of the user when no portable function is provided is calculated as:
using the formula
Calculating the average satisfaction of the user when providing the portable function is +.>
Using the formula
Computing average importance perception of a user for a portable function
The average satisfaction and importance perception of the users of other vehicle body function attributes are calculated according to the same calculation method, and the average importance ranking is obtained, and the results are shown in table 4.
TABLE 4 average satisfaction score for Kano model
3) Determining user demand attribute categories
According to the statistical result of Table 4, the positive and negative average satisfaction values are paired
Marked in a two-dimensional quadrant graph of Kano user demand. Referring to fig. 2, according to the region where the coordinate points are located, the Kano category corresponding to the functional attribute is known. Taking the portability function attribute as an example, it is known that the average satisfaction score of the user when the portability function is not provided is calculated by using the formula (1)
From the calculation of formula (2), it is known that the average satisfaction score of the user when providing the portable function +.>
Thus, the positive and negative average satisfaction value pair for the portable function attribute is (3.083, 3.833). And marking the numerical value pair as a function 1 in a two-dimensional quadrant graph of the user requirement, and judging that the portable function attribute is a standard requirement according to the quadrant area where the numerical value pair is positioned. Other functions are evaluated in the same manner, and the user demand attribute categories of the resulting vehicle body functions are filled in table 4.
According to calculation and combination with a two-dimensional quadrant graph, the portable function (function 1), the stability (function 7) and the sitting and lying ability (function 8) are the normative requirements; storage function (function 2), combinability (function 3), removability (function 4) are interest requirements; foldable (function 5), pushable (function 6) are basic requirements.
Step two, analyzing the functional structure of the baby carriage body
(1) Functional structural disassembly of baby carriage body
The user demand is analyzed by the FAST method, the stroller is decomposed into four large-function systems (riding function, moving function, protecting function and folding function), and the FAST method is utilized to decompose according to the stroller structure from top to bottom.
1) Riding function
A FAST function tree (shown in fig. 3) is built for the riding function of the baby stroller, the riding function is taken as a basic function, and the secondary function is further obtained by decomposition: the back, buttocks and feet are supported, and the corresponding vehicle body function structure is as follows: chair back, cushion and foot pedal.
2) Mobile function
A FAST function tree (same as fig. 3, abbreviated) is built for the movement function of the baby carriage body, the movement function is taken as a basic function, and the secondary function is further obtained by decomposition: the steering control direction, power supply and steering are as follows: handle, push rod, front and back wheels.
3) Protection function
A FAST function tree (the same as fig. 3, abbreviated) is built for the protection function of the baby carriage body, the protection function is taken as a basic function, and the secondary function is further obtained by decomposition: the car body has the functions of shielding sunlight, preventing slipping and preventing leaning forward, and the corresponding car body has the following functions: sunshade, safety belt, front guardrail.
4) Folding function
A FAST function tree (same as fig. 3, abbreviated) is built for the folding function of the stroller, which serves as a basic function, and is further decomposed to obtain a secondary function: support the automobile body, fold the automobile body, dismantle the automobile body, and rather than corresponding automobile body function structure is: a frame and a folding device.
In summary, other secondary functions related to the basic function and corresponding functional structures are obtained. The definition table of the functions of the parts of the baby carriage body is obtained in consideration of other additional functions of the baby carriage body, such as food placement, storage, etc., as shown in table 5.
Table 5 functional definition of parts of baby stroller
(2) Vehicle body function deployment
According to the function definition of the parts of the handcart, the functions of the handcart corresponding to the functional structures are defined as three-level functions, and are classified to form two-level basic functions, so that the function unfolding table 6 of the handcart for babies is formed integrally.
Table 6 functional deployment watch for baby carriage
Step three, vehicle body function system construction
(1) Building a 'demand-function' quality house matrix model
The infant car body user demand expansion table and the infant car body function expansion table are combined to establish a 'demand-function' quality house matrix model (shown in table 7), the user demand expansion table is used as a 'left wall' of the quality house, and the infant car body function expansion table is used as a 'roof'. The "strong correlation", "medium correlation" and "weak correlation" are respectively represented by 5 points, 3 points and 1 point, and represent the correlation between the user demand and the function.
Table 7 Trolley "demand-function" quality house model
The "demand-function" quality house model is examined, each demand is analyzed for at least one function corresponding to it, and each demand must have a 5 point (strong correlation). Analysis and examination of the combinable requirements show that no corresponding structural function is realized, and the requirements belong to type A interest requirements, and the importance is the lowest. Thus, this need is not met in the design. Analysis and examination of the "stability requirement" shows that no corresponding structural function is realized, but the requirement belongs to the O-type specification and has higher importance. Therefore, it is known that the existing infant car body function system cannot fully meet the stability requirement and lacks necessary functions. The "shock absorbing" function may be added through the discussion of the relevant designer. Analysis and examination of parent-child interaction show that no corresponding structural function is realized. Thus, in combination with kano class and importance analysis, a "seat orientation adjustment" function may be added.
By checking the quality house model from different angles, supplementing necessary functions and deleting redundant functions, a functional system oriented to the user's needs is finally formed, as shown in table 8.
Table 8 infant car body function expansion table based on user's requirements
(2) Construction of "function-parts" quality house model
According to the mass house model of the baby car body structural parts and the functional-parts, the strong correlation, the medium correlation and the weak correlation are respectively expressed by 5 minutes, 3 minutes and 1 minute. A correlation between the target function and the body part is established, defining which structures will affect the implementation of the function, as shown in table 9.
Table 9 baby stroller "function-parts" quality house model
Checking a quality house model to ensure that each function has corresponding parts and components corresponding to the parts and at least one strong correlation symbol exists in the correlation relationship; and (5) repeatedly checking. Through inspection, the damping function and the seat direction adjusting function are added in the process of constructing the 'demand-function' quality house, and a damping spring is also needed to be added; for meeting the function of 'seat direction adjustment', a seat direction regulator is needed to be added, so that parent-child interaction is realized.
To sum up, in order to satisfy the newly added function, the vehicle body function structure is updated, and a new infant vehicle body part development table 10 is formed.
Table 10 baby carriage body parts unfolding table
Examples:
design optimization of trolley body
(1) Determining the shape and design category of a trolley
The selected body parts are screened for external design features according to the FAST functional analysis method, and the design category of the stroller is determined and numbered sequentially (as in table 11).
Table 11 baby carriage appearance design category and number
(2) Building a morphological matrix of design characteristic elements of the hand-push car body modeling
Design features of the relevant parts are collected and contoured according to the modeling design categories identified in table 11. According to 5 design categories, the design features of the relevant parts are classified and coded, and a shape matrix of elements of the design features of the baby carriage is established, as shown in table 12.
Table 12 shape and design characteristic element form matrix of baby carriage
(3) Combined scheme of appearance modeling characteristic elements of handcart
And combining characteristic elements through a morphological analysis method, and optimally screening all the combined schemes to obtain 5 baby carriage modeling characteristic element combined schemes (shown in table 13). And 5 combination schemes are evaluated from the aspects of satisfying functions, appearance modeling and technical realization at equal angles, and finally A2 is selected as an optimization scheme.
Table 13 baby carriage appearance modeling combination scheme
(4) Functional structural design scheme and detail display of handcart
According to the 'demand-function' quality house and the 'function-part' quality house unfolding table obtained by Kano, QFD and FAST analysis, the requirements of the designed baby carriage are defined as follows: the portable bicycle has the advantages of light weight, portability, convenience in carrying, convenience in shopping, convenience in installation, component replacement, convenience in transportation, convenience in pushing up, flexibility in turning, sitting and standing, lying, parent-child interaction, small volume after folding, simplicity in folding, adaptation to uneven road sections, no jolt, high safety and high comfort. The baby carriage comprises the following structures: the bicycle comprises a bicycle frame, a folding device, a chair back, a seat cushion, a pedal, a handle, a push rod, front and rear wheels, a sunshade, a safety belt, a front guardrail, a storage basket, a damping spring and a seat direction regulator. The optimization process is as follows:
(1) Portable and folding function design analysis of handcart
The baby carriage body has the advantages of light weight, convenient carrying, convenient installation, replaceable parts, convenient transportation, small volume after folding, simple folding and classification as the design of the portable and folding functions of the baby carriage, and the carriage body structure related to the baby carriage body is a carriage frame and a folding device. Starting from the folding mode and the vehicle body material, the vehicle body folding mode needs to be considered in design, and the volume is smaller after the vehicle body folding mode is simpler to fold.
(2) Functional design analysis for sitting and lying of handcart
The sitting, lying and parent-child interaction requirements can be classified into the design of the sitting and lying functions of the baby carriage, and the corresponding vehicle body structure comprises: chair back, seat cushion, foot pedal and chair direction regulator. In the design, the child seat is started from the child seat, the design requirements are met by adjusting the angle and the direction of the seat, and the child seat can be adjusted to be in a sitting mode of fig. 4, a parent-child mode of fig. 5 and a lying mode of fig. 6 according to specific needs.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Two modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A vehicle body combination function design method integrating Kano, QFD and FAST is characterized by comprising the following steps:
(1) Analyzing the requirements of a vehicle body user;
from the perspective of user demands, exploring the vehicle body function demands, integrating a KJ method and a Kano model, carrying out layering and quantitative analysis on the user demands, determining importance, and establishing a user demand expansion table;
the specific steps of the step (1) are as follows:
(1-1) user demand hierarchical analysis;
acquiring the requirement conditions of the vehicle body users through user investigation and access, recording and sorting the requirements of all users, screening, filtering and sorting to obtain three-level requirement cards, classifying the obtained three-level requirements again, classifying the three-level requirements meeting the same requirements, and sorting the user requirements through a KJ method to obtain secondary requirements;
(1-2) determining user demand attribute classification and importance, specifically comprising:
(1-2-1), design and collection of Kano questionnaires;
(1-2-2), collecting and analyzing user demand data and establishing a Kano quantification model;
user data is quantitatively analyzed through Kano questionnaire collection by designing quantization indexes of a Kano model, and for each vehicle body function u j To
Representing not providing the vehicle body function u j Average satisfaction of user at time, in +.>
Representative providing body function u j Average satisfaction of user at time, in +.>
Representing the user's vehicle body function u j Average importance perception of (1), namely:
wherein I represents the users, I represents the total number of users;
two-dimensional image of Kano user demandNumerical coordinates (X) are marked in the limit map j ，Y j ) Wherein the unsatisfied value is represented by the abscissa and the satisfactory value is represented by the ordinate, and then X is set j And Y j Threshold value, according to coordinate point (X j ，Y j ) The type of the user demand attribute is determined, the average satisfaction degree and the importance degree perception of the users of other vehicle body function attributes are calculated respectively, and the ordering of the average importance degree is obtained;
(1-2-3) determining a user demand attribute category;
according to the coordinate point (X j ，Y j ) In the region, kano categories corresponding to the function attributes can be obtained, and user demand attribute categories of the vehicle body functions are obtained;
(2) Analyzing the vehicle body function structure;
decomposing the vehicle body function structure by adopting a FAST method, and establishing a matching relation between the vehicle body function and the structure by establishing a vehicle body function tree, and establishing a vehicle body function unfolding table and a vehicle body structure part unfolding table;
(3) Constructing a vehicle body function system;
the Kano model and the QFD theory are combined, and the QFD quality house model is redesigned; and (3) importing the user demand expansion table in the step (1) and the vehicle body function expansion table in the step (2) into a model, constructing a demand-function quality house model, and ensuring one-to-one correspondence between demands and functions by supplementing and deleting vehicle body functions from the perspective of user demands and the perspective of vehicle body functions.
2. The vehicle body combination function design method integrating Kano, QFD and FAST according to claim 1, wherein the specific steps of the step (2) are as follows:
(2-1) decomposing a vehicle body functional structure;
analyzing the user demand by using a FAST method, decomposing the vehicle body into four large-function systems, namely a riding function, a moving function, a protecting function and a folding function, and decomposing the vehicle body according to the vehicle body structure from top to bottom by using the FAST method to obtain other secondary functions related to the basic function and corresponding functional structures; wherein the four large function systems are respectively as follows:
riding function: building a FAST function tree aiming at the riding function of the vehicle body, and further decomposing the riding function to obtain a secondary function: the back support, the buttocks support and the feet support, and the corresponding vehicle body function structure is as follows: chair back, cushion and foot pedal;
the moving function: building a FAST function tree aiming at the mobile function of the vehicle body, and further decomposing the mobile function to obtain a secondary function: the steering control direction, power supply and steering are as follows: a handle, a push rod, and front and rear wheels;
the protection function: building a FAST function tree aiming at the protection function of the vehicle body, and further decomposing the protection function to obtain a secondary function: the car body has the functions of shielding sunlight, preventing slipping and preventing leaning forward, and the corresponding car body has the following functions: sunshade, safety belt and front guard rail;
folding function: building a FAST function tree aiming at the folding function of the vehicle body, and further decomposing the folding function to obtain a secondary function: support the automobile body, fold the automobile body, dismantle the automobile body, and rather than corresponding automobile body function structure is: a frame and a folding device;
(2-2) unfolding the functions of the vehicle body;
according to the function definition of the vehicle body parts and the matching relation between the vehicle body functions and the structures, the vehicle body functions corresponding to the functional structures are defined as three-level functions, the three-level functions are classified to form two-level basic functions, and a vehicle body function expansion table and a vehicle body structure part expansion table are established.
3. The vehicle body combination function design method integrating Kano, QFD and FAST according to claim 2, wherein the specific steps of the step (3) are as follows:
(3-1) constructing a demand-functional quality house matrix model;
the method comprises the steps of establishing a demand-function quality house matrix model by combining a car body user demand expansion table and a car body function expansion table, taking the user demand expansion table as a left wall of a quality house, and taking an infant car body function expansion table as a roof;
checking a requirement-functional quality house model, analyzing at least one function corresponding to each requirement, and finally forming a functional system guided by the requirement of a user by checking the quality house model from different angles;
(3-2) constructing a function-part quality house model;
according to the vehicle body structure parts and the function-part quality house model, establishing a correlation between a target function and the vehicle body parts, and determining which structures influence the realization of the function;
checking a quality house model to ensure that each function has corresponding parts corresponding to the quality house model;
to satisfy the newly added function, the body function structure is updated to form a new body part expansion table.
4. The vehicle body combination function design method integrating Kano, QFD and FAST according to claim 3, wherein the vehicle body is a stroller vehicle body.
5. The vehicle body combination function design method integrating Kano, QFD and FAST according to claim 4, wherein the secondary requirements in the step (1-1) include portability, storability, combinability, detachability, foldability, pushability, sitting-lying ability, stability.
6. The vehicle body combination function design method integrating Kano, QFD and FAST according to claim 5, wherein the correspondence between the requirements and functions is: the portable corresponding function is light weight and convenient carrying; the storage corresponding function is to place personal things and facilitate shopping; the combinability corresponding function is that the components are used in combination, so that different use scenes are met; the corresponding function of detachability is convenient installation, replaceable parts and convenient transportation; the corresponding function of the foldability is that the volume is small after folding, and the folding is simple; the corresponding function of the pushability is that the pushing is convenient and the steering is flexible; the corresponding functions of sitting and lying are sitting and lying and parent-child interaction; the stability corresponding function is to adapt to uneven road section, not jolt, security, travelling comfort height.
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