This paper proposes a path planning method based on dual uniform curve, taking dynamic performance and parking path smoothing as the key attributes, the automatic parking tracking control is realized by designing fuzzy controller, which solves the problems of low automation, inconsistent segmented path planning, inconsistent real vehicle motion model and low parking success rate. In this paper, the feasibility and accuracy of using CarSim and MATLAB are verified by establishing a joint simulation experimental platform and analyzing the error of the simulation results of vehicle speed and parking path.

This paper illustrates the process of obtaining different sets of non-zero distinct integer solutions to the non-homogeneous ternary quadratic Diophantine equation given by X² + Y² = Z² +14.

In order to obtain the peak tire-road friction coefficient in real time and accurately, and improve the stability control of vehicles, a longitudinal and lateral combined road adhesion coefficient estimator is proposed. Firstly, based on robust adaptive observer, a tire-road friction coefficient estimator based on side force is established. Secondly, an estimator of tire-road friction based on longitudinal force is established by using a sliding mode observer. Finally, appropriate fuzzy rules were established according to different driving conditions, and a joint fuzzy controller of longitudinal and lateral tire-road friction coefficient was established, so as to fuse and optimize the results obtained from longitudinal and lateral estimators. The simulation results show that the combined estimator has lower error and stronger robustness than the single estimator.

In order to reduce the energy consumption of the vehicle in the braking process, a braking energy recovery system is proposed with the airbag accumulator as the storage component. The vehicle model and hydraulic system model are obtained through the co-simulation of MATLAB and AMESim. In order to verify the feasibility of the braking energy recovery system,  Based on MATLAB/Simulink/Simcenter Amesim Interfaces and Amesim set up a joint simulation platform, the vehicle control model based on Amesim structures, based on MATLAB to build the rest, both through the interface integration, Taking a car as an example, parameterization and co-simulation are carried out, and the results show that:  Accumulator energy storage state of engine working conditions and the influence of the regenerative braking is larger, with NEDC condition before the 100 s as a benchmark, accumulator for braking energy recovery not only, also shows that under braking, accumulator effective absorption of the vibration of the system and pulse, vehicle running smoothly, braking energy recycling again, instead of the engine to run within the range of economic,  Obviously reduce fuel consumption, reduce fuel consumption, energy saving effect is obvious.

Flexible roll forming is a new forming process developed on the basis of traditional constant cross-section roll forming. It can produce variable cross-section products flexibly and efficiently, which is of great significance to the lightweight of parts. Aiming at the defects of cracking, wrinkling and insufficient forming of automobile variable cross-section rolling parts, an optimization method based on response surface method is proposed. Taking the pass spacing, sheet thickness and pass times as the optimization factors, taking the maximum thinning rate and longitudinal bow height as the objective function, the fitting equation between the optimization factors and the objective function is constructed by response surface method, and the optimal parameter combination is obtained: A is 600mm, B is 4mm and C is 9. The actual experimental results are basically consistent with the finite element results, which shows that this method can effectively optimize the rolling parameters of variable section.">

In this paper, the strategy of braking energy recovery is developed based on the series regenerative braking structure of pure electric vehicle and the effectiveness of the proposed strategy were verified on the virtual simulation platform. Firstly, a fuzzy control strategy is proposed based on the analysis of the series braking energy. The corresponding fuzzy rules are established based on the speed V (km/h), battery SOC, braking intensity Z, and the proportional coefficient K of the recoverable braking energy is deduced. Secondly, based on the analysis of vehicle dynamics, the vehicle dynamics model is established in MATSAB/Simulink. Finally, the simulation results in NEDC (New European Driving Cycle) and FTP75 operating conditions verify the effectiveness of the proposed fuzzy control strategy, which plays a certain role in optimizing the energy management of electric vehicles.

With the gradual improvement of people's environmental requirements, photovoltaic power generation and other less polluting new energy industries have gradually entered the market. Considering that the photovoltaic tracking system can improve the energy-saving benefit of the system as much as possible on the basis of improving the photovoltaic output power, a photovoltaic tracking strategy combining fixed frequency and variable frequency is designed. The strategy determines the frequency conversion node through cluster analysis, and optimizes the tracking frequency with the goal of maximizing the energy-saving benefit of the system. Through simulation, this strategy can achieve more than 90% energy saving in system tracking, and has a good application prospect.

In this paper, a new auxiliary equation method is presented. Analytical multiple function solutions including trigonometric function, exponential function, hyperbolic function and other functions can be easily obtained. Novel multiple function solutions of the Davey-Stewartson system are obtained successfully by using this new auxiliary equation method. It is very significant to help physicists to analyze special phenomena in their relevant fields accurately.

Understanding Longitudinal traffic dynamics helps highway operators to effectively manage traffic flow under various situations. This study particularly focuses on the changes in lane use distribution due to the combined effect of a bus stop and an entrance point. Depending on a bus stop location in the upstream or downstream of an entrance, two cases are investigated. A series of models is developed to analyze the relationship between lane use distribution and traffic density, bus arrival rate, merging volume. Date collected from other two locations is used to verify the developed models of lane use distribution on two cases.A comparison of estimated and observed values on the distribution is carried out. Findings show that the suggested models have high accuracy and reliability. The models could also predict lane use distributions of individual lanes that can be used to monitor traffic use conditions under proposed traffic control strategies. The results of study can be applied to traffic control optimization at locations near bus stops and entrance points on urban expressways.

This paper presents the development and validation of a gait algorithm for the Nao robot from Aldebaran Robotics. The gait algorithm starts calculating the inverse kinematics using the Groebner bases on a trajectory ZMP (Zero Moment Point) proposed. It has 4 fuzzy controllers: position verification, robot stabilizer, ZMP trajectory verification, and ankle position controller. For virtual verification, Webots software was used and implemented in the Nao robot, validating the gait algorithm. The tests were done on artificial grass and on a flat surface. As a result, the NAO robot is presented with a walk considered stable on artificial grass, in virtual and physical robot.

In order to better ensure the safety of the car during driving and improve the reliability and stability of driving, the braking system as an important part of the car cannot be ignored. There is a fault, so it is best to check the braking system of the vehicle before leaving the car. In this paper, the leading shoe drum brake is designed and further improved on the basis of the original performance, such as better braking performance, shorter design cycle, lower cost and so on. First, the basic theoretical knowledge of drum brakes is explained, including the structure, working process and basic parameters of the shoe drum brake; secondly, the brake drum and brake shoes of the shoe drum brake are explained. The three-dimensional solid modeling and the assembly of some components were carried out with the friction plate; finally, the material optimization and clearance adjustment of the drum brake were carried out.

The era of artificial intelligence has brought instruments with higher and higher accuracy to the field of engineering survey. The application of tilt photogrammetry technology and UAV aerial photography has provided a larger platform for engineering survey and shortened the construction period. This paper mainly analyzes the advantages and disadvantages in line engineering, industrial and civil buildings, municipal construction, planning and design, and puts forward the combination of total station, GNSS receiver and UAV to be applied to specific projects to improve the progress of engineering construction and visual analysis.

Laplace transform is very powerful technique to switch operation of differential and integral calculus by operation of algebraic expression. It is useful and efficient technique to solve various scientific and engineering problems. In this paper we summarized some basic properties of Laplace and inverse Laplace transform firstly and explore some application of Laplace transform with the help of some example. We determine current in L-R circuit, displacement of particle at some particular time t and lastly, we find simultaneous solution of differential equation using Laplace transform