59 results about "Transims" patented technology

Systems and methods are provided for interacting with a plurality of autonomous vehicles. In one implementation, a system may include at least one processor. The at least one processor may be programmed to receive from each of the plurality of autonomous vehicles navigational situation information associated with an occurrence of an adjustment to a determined navigational maneuver, analyze the navigational situation information, determine, based on the analysis of the navigational situation information, whether the adjustment to the determined navigational maneuver was due to a transient condition, and update the predetermined model representative of the at least one road segment if the adjustment to the determined navigational maneuver was not due to a transient condition.

The invention discloses an automobile instantaneous fuel consumption monitoring method in an intelligent network connection environment. The method comprises steps that a normalized variable trigonometric function model is preset, and a fuel consumption rate is predicted, in the formula, v represents that the to-be-predicted fuel consumption rate corresponds to the speed of an automobile, a represents that the to-be-predicted fuel consumption rate corresponds to the acceleration of the automobile, and b represents that the to-be-predicted fuel consumption rate corresponds to the acceleration;wherein beta1, beta2, beta3 and beta4 are known parameters, vmin represents the minimum speed value in the actual measurement data sample set under all the comprehensive typical road working conditions, vmax represents the maximum speed value in the actual measurement data sample set under all the comprehensive typical road working conditions, am represents the minimum acceleration value in the actual measurement data sample set under all the comprehensive typical road working conditions, and amin represents the minimum acceleration value in the actual measurement data sample set; and amax represents the maximum speed value in the actual measurement data sample set under all comprehensive typical road working conditions. According to the method, transient fuel consumption under the Internet of Vehicles can be predicted only by using limited four parameters.

The invention disclose a control method of tan intelligent automobile under a variable adhesion coefficient repetitive track, which changes the prediction range according to the adhesion coefficient change probability on the basis of a traditional MPC single prediction range so as to improve the emergency capacity of the intelligent automobile. According to the invention, an iterative learning control method is adopted to track the path, the tracking precision of the path is improved, and the driving stability of the intelligent automobile is improved in combination with a yaw stability controller. The MPC controller calls a corresponding control strategy which may occur in advance according to information provided by an environment sensing module, wherein the corresponding control strategy comprises a corresponding prediction time domain and a constraint set; afterwards, iterative learning control is used as a method for determining correct steering input of transient driving, the tracking performance is improved through multiple iterations, and the driving stability of the intelligent automobile is improved in combination with the yaw stability controller.

In one aspect, a system for allocating fault in a collision involving a vehicle is provided. The system may include (1) a sensor coupled to the vehicle and configured to collect contextual data related to the collision, (2) a non-transitory memory configured to store the contextual data, and (3) a processor coupled to the non-transitory memory and configured to (a) gain access to the contextual data, and (b) compute and assign a fault percentage to a driver of the vehicle based upon the contextual data.

The invention provides a method for obtaining the direct route added mass of an underwater vehicle. The method comprises the steps that A, importing an AUV model; B, carrying out grid division; C, verifying grid independence to obtain a better network; D, performing time step independence verification to obtain a better transient simulation time step; E, importing grids; and F, compiling a UDF program and importing the UDF program into fluent for transient simulation. Different from a traditional CFD method based on dynamic grids, the method does not need to use the dynamic grids, simulates the speed change process of the AUV by changing the fluid speed, monitors a resistance value, and solves the added mass through calculation. According to the method, the calculation precision is ensured, the grid requirement is reduced, and the calculation speed is greatly improved. In order to verify the accuracy of the method, CFD simulation and theoretical calculation are carried out on a standard ellipsoid. The deviation between the obtained added mass value and a theoretical calculation value is smaller than 3%, and it is indicated that in the initial stage of design, the result of calculating the added mass of the AUV with any shape in the direct route direction through the method is reliable.

The invention discloses a permeable asphalt pavement permeability evaluation method based on fluid-solid coupling analysis, which includes indoor tests to determine material parameters and hydrological parameters of each structural layer of the pavement; establishment of unsaturated seepage models of each structural layer; establishment of a permeable asphalt pavement system The numerical model simulates the initial humidity field inside the pavement system; analyzes the rainfall infiltration process based on the saturated-unsaturated fluid-solid coupling theory, and simulates the dynamic change of the humidity field under rainfall conditions; evaluates the permeability of permeable asphalt pavement. The method of the present invention comprehensively considers the influence of the initial humidity field caused by the groundwater within the range of the road surface and the type of roadbed soil on the internal permeability of the road surface, and more accurately simulates the mutual coupling and influence between the rainfall infiltration process and the fluctuation of the groundwater level; the indoor test Combined with numerical simulation, the transient analysis of the rainfall infiltration process inside the permeable asphalt pavement system can be realized, which can more intuitively evaluate the permeability performance of the road structure, which is feasible and efficient.

The invention discloses a numerical simulation method for pavement structure fatigue cracking based on extended finite element, comprising: determining mechanical parameters, thermal parameters, and fatigue life data of materials through experiments; fitting and obtaining a fatigue damage model suitable for corresponding pavement materials; using the fatigue model Realize the accumulation of fatigue damage to the unit material; define the crack nucleation initiation criterion of the damaged material; simulate the temperature field; simulate the fatigue cracking process of the pavement structure. The present invention considers the mutual coupling and interaction between fatigue and cracking, and adopts the transient temperature field in the simulation, more accurately simulates the influence of temperature on the fatigue cracking of the road surface; realizes fatigue-cracking of road materials under approximate actual road surface conditions The whole process simulation can more effectively use the data of indoor tests for the prediction of road fatigue life, and provide basis and guidance for road design and maintenance.

The invention belongs to the technical field of electric vehicles, and in particular relates to a method for observing the side slip angle of the center of mass of a four-wheel drive electric vehicle based on fusion technology. The present invention deduces the steady-state expression of the side slip angle of the center of mass based on the two-degree-of-freedom dynamic model; uses the recursive least squares method to estimate the tire cornering stiffness; introduces the UniTire tire model to form a closed-loop estimation loop, and dynamically adjusts the steady-state model parameters at the same time , and construct a center-of-mass sideslip angle observation structure with simple structure and good suppression of sensor noise. The kinematic observation method is introduced, and the fusion rules are formulated through dynamic feature extraction to improve the estimation bandwidth of the steady-state observation structure. The revised estimation method has better high-frequency transient estimation ability. Finally, the trapezoidal test, angle step test and sine test are simulated under high adhesion and low adhesion road surfaces, and statistical principles are used to analyze the estimated results, which proves the effectiveness of the design method.

A non-transitory computer-readable medium having a program stored thereon that, when executed by one or more processors, directs a computing system to secure a communication network. The program comprises a traffic inspection engine, a domain generation algorithm (DGA) inspection engine, and a message bus communicationally coupling the traffic inspection engine and the DGA inspection engine. The traffic inspection engine is configured to identify if a traffic session containing a domain name system (DNS) request and / or response in a communication network includes a DGA generated domain and send information about the identified DGA generated domain to the DGA inspection engine via the message bus. The DGA inspection engine is configured to verify if the identified DGA generated domain is registered, and send information about the registered DGA domain to the traffic inspection engine via the message bus. The traffic inspection engine is further configured to inspect, using the information about the registered DGA generated domain, if a subsequent traffic session in the communication network contains the registered DGA generated domain.

The invention relates to a vehicle bench test simulation road test transient condition loading method. According to test statistics, a formula of a difference of a road test system resistance formula and a bench test system resistance formula of vehicle neutral gear sliding in different reference quality ranges is obtained; there is no need to test a detected vehicle or calculate system resistance of the road test and the bench test. The vehicle reference quality is used to replace the sum of a vehicle translation quality and a correlated revolving member equivalent inertia and there is no need to measure the correlated revolving member equivalent inertia of the detected vehicle. When constant-speed condition simulation is carried out, the formula of the road test system resistance and bench test system resistance formula difference is used to determine a loading force to carry out constant force control; and when accelerated condition simulation is carried out, product of a difference between the vehicle reference quality and a stand basic quality and a regulated accelerated speed is added; and speed changing and loading force changing are employed to control loading.

The present invention provides a method for optimizing transient performance parameters of vehicle handling stability based on sensitivity analysis, which includes the following steps: Step S10, establishing a vehicle dynamics simulation model by using virtual prototype technology, and simulating vehicle dynamics according to the actual parameters of the vehicle Modify the parameters of the model; step S20, score the initial transient performance of the vehicle dynamics simulation model according to the vehicle handling stability evaluation index; step S30, perform sensitivity analysis on the vehicle dynamics simulation model, and screen out parameters with high sensitivity; In step S40, parameters with high sensitivity are optimized by the isight optimization tool; in step S50, the transient performance of the vehicle dynamics simulation model after parameter optimization is scored according to the evaluation index of vehicle handling stability. The advantages of the present invention lie in that the steering stability of the vehicle is optimized in the design stage, the cost of the vehicle is reduced, and the safety is improved.