Nowadays, the competition among industries is fierce and the market economic system is changing rapidly, which puts forward higher requirements for the financial management of enterprises. The flexible financial management method can be adjusted timely and appropriately according to the changes of external factors. Make all-round adjustments to the use of funds in multiple links such as enterprise investment, financing and operation, so as to more effectively manage the financial operation of the enterprise and provide more accurate and valuable information for the future operation and development of the enterprise [1]. This needs the comprehensive cooperation of various factors in optimizing enterprise financial management. Among them, the flexible management of capital structure plays a positive role in promoting the flexible operation of financial management. Therefore, it is very necessary for enterprises to adopt appropriate and scientific methods to effectively carry out flexible financial management of flexible capital structure (Figure 1). Flexibility is a kind of ability to deal with the uncertainty caused by the change of external environment. Flexible financial management refers to the ability of enterprises to quickly deal with the impact of uncertain factors on financial business activities when external environmental factors change. At present, this ability is reflected in three aspects: buffer ability, adaptability and innovation ability. At the same time, combined with three ways to assist enterprises to realize flexible financial management, and finally give full play to its role in enterprise development. The three types of management methods are income distribution management flexibility, financing management flexibility and capital investment management flexibility [2]. Koosha h believes that the goal of value chain accounting is to provide real-time value-added information to help managers optimize and reconstruct the value chain, make management decisions and improve management efficiency. They also said that in order to achieve this goal, value chain accounting has the basic function of real-time evaluation and reflection and the core function of multi-dimensional control [3]. Based on the value chain theory and accounting management theory, Suleiman discusses the specific constituent elements of the value chain accounting management framework, expounds in detail the internal relationship and operation mechanism of the system, the similarities and differences of the unified accounting, and highlights the essence and characteristics of value chain accounting from the aspects of connotation, objective, function, subject and accounting scope [4]. After comprehensively analyzing the economic environmental conditions and theoretical development status of value chain accounting, samsatli s constructed the basic framework of the theoretical structure of value chain accounting. They analyzed the composition of value chain accounting system, including the hierarchical relationship between operation objectives, assumptions, essence, principles, procedures and methods [5].

Based on the current research, this paper constructs a relatively complete value chain accounting framework by combing the development process of value chain accounting exploration and cost management at home and abroad. Then, a practical case is applied to illustrate the advantages of introducing value chain accounting and its analysis method to improve cost management in advanced manufacturing industry. Finally, it introduces the preconditions for using value chain accounting and its analysis methods to improve cost management.

The first derivative _{0}) is the rate of change of _{0}_{0}, x changes by one unit, y changes by _{0}) units

Example 1 function

It means that when

Cost is the cost that the producer spends on producing goods There are three basic cost concepts: total cost, average cost and marginal cost Let _{1} the fixed cost, _{2} the variable cost,

Total cost function

Average cost function

Marginal cost function

Income refers to the income of producers from selling goods. Let

Total return function

Average return function

Marginal income function

Profit is the difference between income and cost, and the profit function is also a function of output (sales volume). If

Demand (

Similarly, price (

The Gomez curve is an image of function (11)

It is an asymmetric S-shaped curve. Where T represents the year or time period, and Y represents the value of each year corresponding to the prediction object (such as sales volume, annual output value, etc.). The rogisti curve is an image of function (12)

It is a symmetrical s - shaped curve It can reflect phenomena with life cycle characteristics, such as population prediction, commodity life span, etc[7].

A brand of cars were sold in a prefecture level city continuously from 2012 to 2018. According to the statistical data of sales volume (excluding group purchasing power) and the scatter diagram of sales volume, the calculation and prediction model has been established as the Goethe curve

Try to analyze and predict the car sales volume of the city in 2019.

The inflection point of the curve obtained by the second derivative of the solution is (6766). It can be seen that the growth rate of car sales is the fastest before and after t = 6 (year)

At that time,

If t = 9, y = 1178 (sets) is the actual sales volume of current cars.

By substituting t = 10 into the model, the predicted value in 2008 is y = 1319 (sets).

Potential market demand = maximum sales − current actual sales = 2082−1178 = 904 (sets)

Market potential = market potential demand / maximum sales volume = 904 ÷ 2082 × 100%=43%

The calculation results show that the market potential is still 43%, and the brand manufacturer can continue to develop in this city.

After the application of value chain accounting information and its analysis methods, cost management no longer only focuses on the calculation and analysis of the costs incurred, but starts to plan, analyze and control the costs from the selection of suppliers and distributors to the design, development, production, sales and scrapping of products on the basis of considering the needs of customers. The improved cost management is an omni-directional and whole process multi-dimensional control system, including overall planning in advance, implementation control in the process and analysis and review afterwards. Before product production, plan the total amount and distribution of cost together with customers, suppliers and distributors; In the process of product manufacturing, relying on the analysis results of value chain accounting information and value appreciation provided in real time by the information technology platform, real-time control is adopted for the operation links that do not increase value but consume resources and processes with large cost deviation, so as to control the cost within the planning scope as far as possible; After the products are manufactured and sold, the current cost planning is adjusted on the basis of meeting the interests of all parties in the value chain alliance, so as to meet the long-term interests of all parties and achieve win-win results [8].

After the application of value chain accounting analysis combined with calculus method, the scope of cost management is extended to design, supply, sales and other aspects within the economic subject. Traditional cost management methods usually focus on the implementation of cost control in the production process, and do not pay attention to the costs of research and development, design, customer service and so on. The improved cost management extends the scope of cost control from the previous scope of “material procurement in to product sales out” to R & D and design before procurement, backward to customer service after sales, and extends the scope of cost management outward to upstream suppliers, downstream retailers and customers. In the improved cost management, enterprises are not regarded as isolated economies, but connected with upstream and downstream enterprises into a chain value chain alliance through value flow. Through full cooperation with upstream and downstream enterprises, we can achieve the common goal of mutual benefit and win-win results, optimize the value chain and reduce costs. For example, by analyzing and understanding the relationship with suppliers and developing a solid strategic partnership with suppliers, enterprises can greatly reduce the speculative opportunities of transactions, reduce transaction risks, minimize the losses caused by delayed delivery and poor quality, and reduce the signing cost of contracts. By strengthening customer relationship management, potential customer development costs and existing customer maintenance expenses can be reduced. While controlling the internal cost of the enterprise, the enterprises in the value chain alliance should also consider the negative impact on other enterprises in the value chain alliance. The improved cost management system considers developing cost control at the height of the whole value chain alliance rather than the cost reduction of a single individual, so as to avoid the one-sided pursuit of cost reduction caused by narrow vision.

After using the value chain accounting information and its analysis methods, the cost management process is naturally regarded as an important means for enterprises and their value chain alliances to achieve their respective strategic objectives. Cost management has risen to a strategic height and has been generally recognized by all constituent units and employees in the value chain. This change in concept will make enterprises and employees more autonomous to participate in the activity of cost management. From the original passive acceptance to active participation, they begin to actively think about cost control in every detail. Improved cost management is an activity process that runs through the whole business process and unfolds in multiple dimensions. It requires every individual to participate in it in order to achieve the goal of cost planning. This requires not only the management, but also every employee to participate in the whole process of cost target planning, implementation, control and evaluation. Allowing employees to participate in the planning process will also improve employees' enthusiasm and enthusiasm [9].

Therefore, the adoption of value chain accounting is a necessary condition for the improvement of traditional cost management. After such a series of changes, the traditional organizational framework will also be reformed. With the rapid change of the environment and the increasingly fierce competition among enterprises, cost management is becoming more and more important and rising to the strategic level. A good cost management system will become the key factor for enterprises to occupy the commanding heights. Because of the strategic significance of cost management, we can no longer only take it as an auxiliary work of enterprises. Under the traditional organizational framework, a special cost management department should be established. The cost management department relies on the platform to obtain various useful information of the enterprise's internal value chain and external value chain alliance in real time to formulate cost objectives. Other departments need to arrange their own business processes according to the plans formulated by the cost management department, and obtain and feed back information with the help of the platform. The cost report and performance evaluation information formed by the cost management department are also fed back to the value chain accounting system in a timely and high-quality manner within the platform (as shown in the figure). Value chain accounting information, cost report and performance evaluation information together constitute an integral part of the information system. This circular system will update the information in real time, so as to realize the function of real-time evaluation and reflection of various value-added situations in the value chain accounting system, and promote the economic subject to achieve the purpose of dynamic control of the cost management system. The new cost management department not only uses the value chain accounting information, but also uses the analysis method of value chain accounting. Therefore, this cost management system is based on value chain accounting and implements its ideological soul [10].

The cost management based on value chain accounting is realized by managing the objective “cost chain” in the internal value chain of the core enterprise, removing the unreasonable part that does not bring value increase, and helping the enterprise obtain a favorable position over its competitors; In the value chain alliance outside the enterprise, the activities are reflected and controlled through XBRL information system.

Because value chain accounting is still in the stage of theoretical research, it has not been actually applied to enterprises, and the information system relied on by the theory needs to be improved, and few enterprises apply the standardized system. Therefore, the author wants to obtain cases to analyze the actual application effect of value chain accounting in the process of cost management. This goal can not be achieved. Therefore, in the case, the author only envisages the application of value chain accounting and the use of value chain accounting information in cost management. Value chain accounting analysis combined with calculus method is the ideological essence of value chain accounting. Therefore, the author uses an actual case to analyze the improvement effect of this analysis method on cost management. The case analysis method is used in the research. The reason is that under the background of a small number of enterprises that independently implement value chain accounting and its analysis methods to carry out cost management, it is not ripe to carry out large sample empirical analysis based on the current situation. In addition, the case study method can use the materials and data that are difficult to obtain by other methods to summarize experience, so as to put forward theories, test existing theories or find problems that need further research. The advantages are mainly as follows: it can treat a large number of non data materials and data obtained in the research process with a more accessible attitude, which can help find new theories; Compared with the empirical analysis method of large sample data, the case study method has the characteristics of obtaining sufficient, specific and deep-seated information. In the case, for the value chain analysis method, the author chose FAW Volkswagen Automobile Co., Ltd. as the research object, and chose the automobile manufacturing industry because it is a typical manufacturing industry. It involves a relatively complete value chain and drives many enterprises, the upstream can drive steel, electronics and chemical industry, the downstream can drive the glass industry, sample rubber industry, textile and tanning and some related industries. The cost management system of automobile manufacturing enterprises is relatively mature compared with the economic subjects of other industries, and the strategic control, budget management, cost control and internal reporting system are relatively sound. FAW Volkswagen was selected in the automobile manufacturing industry mainly because it is a leader in the automobile manufacturing industry and has done well in the information technology platform. The advanced information technology platform is also one of the necessary conditions for the efficient introduction of value chain accounting analysis combined with calculus among different economic entities. Maybe FAW Volkswagen can not fully represent the manufacturing industry. The author is still concerned about the company in this regard. FAW Volkswagen has grown from a Jetta car factory with a design capacity of only 150000 single models to the current pattern of three places and four factories, with mature a, B and C full series automobile production and manufacturing bases, and its automobile production and sales are growing rapidly (as shown in Figure 3).

In recent years, the competition in China's car industry has become increasingly fierce. Under the environment of the development of the world automobile industry, its average profit margin also tends to decline. On the other hand, with the continuous rise of price level and the rising cost of raw materials, the cost of many parts of FAW Volkswagen also rises. At the same time, because many parts of FAW Volkswagen need to be imported from the euro area, the continuous adverse changes in the exchange rate between the euro and RMB also cause the further rise of operating costs to a certain extent. Rising prices and rising exchange rates have led to the continuous rise of vehicle costs, and fierce competition has forced the automobile manufacturing industry to continuously reduce vehicle prices. Under such a severe environment, FAW Volkswagen has great pressure on cost management [11].

FAW Volkswagen's comprehensive cost control began after the introduction of modern ERP system. FAW Volkswagen's ERP system has completed three function upgrades so far, and now almost includes all R / 3 modules of SAP. After using the system, the company has made great improvements in procurement management, inventory management, production management, quality control and financial management, so that the company's cost management has also been greatly improved. However, the management cost of FAW Volkswagen has been increasing in recent years, which is largely due to the low degree of collaborative management of the whole supply chain. Although the company uses the modern ERP system for cost management, the system can only control the internal cost of FAW Volkswagen, but can not realize the collaborative management of the whole supply chain. As an international and super large-scale advanced automobile manufacturing industry, it is impossible for enterprises to obtain long-term advantages between competitive value chain alliances only through this system to reduce internal production and operation costs.

In order to meet the market demand, FAW Volkswagen has launched a customer-oriented order production mode. The cost management method under this mode is mainly target cost method. Although this cost management method can effectively control the costs of inventory, production logistics and return, under the environment of world automobile development, the overall profit margin of China's automobile manufacturing industry is decreasing. This cost management method is easy for enterprises to ignore product quality in some aspects in order to maintain or improve profits. For example, in the first quarter of 2015, FAW Volkswagen announced that it would recall 560000 problematic Sagitar vehicles due to quality problems. According to the analysis, the problem of FAW Volkswagen Sagitar this time stems from a series of problems such as paint falling off and rust, abnormal noise during driving and so on, Even the high-speed rear suspension is directly broken, resulting in the whole vehicle almost out of control. This makes us have to pay attention to the limitations of target cost method in cost control again.

It can be seen that updating the cost management system is the key to FAW Volkswagen's competitive advantage. This paper also expects to complete the collaborative management of the whole value chain alliance by introducing value chain accounting and its analysis methods, and overcome the defects of target cost method in cost control.

As a leading enterprise in the domestic automobile manufacturing industry, FAW Volkswagen has been actively leading the pulse of industry development in many aspects. For example, the R / 3 platform of SAP company was first introduced for enterprise management, which explored a new way for automobile enterprise management; In 1998, the company spent 3 million yuan to successfully develop JIT production information control system, and completed the transformation of rationality, efficiency and flexibility in the whole process of production and operation; The sub module SRM system (supplier relationship management system) in SAP improves the mechanism of supplier selection, evaluation and development, and is an effective measure to optimize and consolidate the value chain alliance; The “rigorous care 365” annual service action created by FAW Volkswagen extends meeting the needs of customers to after-sales, which not only improves customer satisfaction and loyalty, but also well reflects FAW Volkswagen's value that customers are regarded as a community of their own interests.

After long-term cultivation and development, FAW Volkswagen has formed relatively stable suppliers, and its geographical distribution is relatively concentrated, mainly including Northeast China, Yangtze River Delta, capital economic circle and Sichuan Chongqing region (as shown in Figure 4).

FAW Volkswagen has advanced information technology platform, management concept and large-scale stable stakeholders including suppliers and customers, which shows that FAW Volkswagen has some basic conditions for the application of value chain accounting in its continuous development.

In order to cope with the fierce competitive environment, more and more companies began to move towards the value chain alliance. The traditional financial accounting and cost management focus on the internal resources and information of the main body, but ignore the resources and information among the members of the value chain alliance. Therefore, it is necessary to implement value chain accounting and update cost management. In addition, combined with the analysis of FAW Volkswagen in the actual case, I think value chain accounting and its analysis methods have strong adaptability in the cost management of advanced manufacturing industry, and can bring long-term cost advantages to enterprises.

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equation Research on the construction of early warning model of customer churn on e-commerce platform Study on inefficient land use determination method for cities and towns from a city examination perspective A sentiment analysis method based on bidirectional long short-term memory networks Evaluation of ecosystem health in Futian mangrove wetland based on the PSR-AHP model A study of local smoothness-informed convolutional neural network models for image inpainting Towards more efficient control of the ironmaking blast furnace: modelling gaseous reduction of iron ores in H _{2}-N_{2}atmosphereAlgorithm of overfitting avoidance in CNN based on maximum pooled and weight decay Mathematical Calculus Modeling in Improving the Teaching Performance of Shot Put Application of Nonlinear Differential Equation in Electric Automation Control System Higher Mathematics Teaching Curriculum Model Based on Lagrangian Mathematical Model Decisions of competing supply chain with altruistic retailer 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