32 results about "Stability Model" patented technology

The invention discloses a milling finish machining method based on the dynamic rigidity of an impeller blade. The dynamic modality of the impeller blade is obtained through a standard modal test, a flutter model is introduced to obtain a stability criterion, and reasonable machining parameters are acquired. The method comprises the followings steps of: 1, performing the modal test to measure the dynamic modality of the impeller blade; 2, building a milling stability model of the impeller blade; 3, studying the dynamic rigidity stability of the impeller blade; 4, obtaining a cutting stability condition under the dynamic rigidity of the impeller blade; and 5, verifying the cutting stability condition and adopting the finally optimized cutting parameters to machine. The problem of cutting flutter caused by milling of thin-walled parts such as the blade is solved by the method, and the machining stability is obviously improved by optimizing the cutting parameters. The method is suitable for finish machining of various thin-walled parts.

The invention relates to a reliable routing method in the context of a mobile Ad hoc network. The method aims to improve effectiveness of data transmission, takes combination of link stability and route selection as the core concept and solves the problem of reliable routing in the context of the Ad hoc network. In the method, data link layer design is closely linked with network layer design; the data link layer generates the newest link stability information for each node according to a link stability model; the network layer configures a link stability form according to the information; the nodes establish routings according to needs when needing to transmit data; the network layer takes the link stability form as a basis, the link stability as a standard for weighing on route selection to establish a reliable routing between the source nodes and the target nodes; a redundancy link is established for unstable links in routing paths to further improve reliability of the routing; advantages of active routing protocol and source-initiated protocol are integrated, routing reliability is ensured in that the link stability form needs to be updated in time; routing information in the routing form only needs to be updated when transmission begins, thus reducing extra expenditure for information control.

A vehicle stability model predictive control method belongs to the technical field of control. The object of the vehicle stability model predictive control method is to establish a vehicle yaw kineticmodel in consideration of road unevenness and design a yaw stability controller by a model predictive control algorithm so as to prevent an electric vehicle against rollover and drift in a poor working condition and a sharp turn. The method comprises steps of establishing a mechanical and kinetic model and a yaw stability controller of an electric vehicle in consideration of road unevenness. In aprocess of formulating a torque distribution strategy, the method considers vehicle safety (preventing skid or lock, rollover or drift), vehicle performance (acceleration and braking performance), and driving comfort (torque change cannot be too large and the vertical force change value cannot be too high), saves control energy (saving energy under the premise of satisfying performance), and improves the kinetic performance of the vehicle.

The invention provides a milling vibration stability predicating method based on the process damping effect. According to the method, in the milling process of a workpiece, the geometric structure parameter of a milling tool and the dynamic parameter in the milling process are obtained, the total energy generated by ploughing and milling force in the workpiece milling process in one cutter tooth rotation cycle is determined, the damping coefficient of the equivalent linear process is obtained through the law of conservation of energy, equivalent linear process damping is converted into equivalent process damping in the x direction and equivalent process damping in the y direction, the equivalent process damping coefficient in the x direction and equivalent process damping coefficient in the y direction are input into a milling dynamics equation, a milling dynamics model based on the process damping effect is obtained, a ZOA method is adopted to solve the milling dynamics model based on the process damping effect, and a vibration stability model based on the process damping effect is obtained, so that relation between extreme stability cutting depth and the cutter rotation speed is obtained, and a vibration stability steel lobe diagram based on the process damping effect is drawn.

The invention discloses a method for determining the safe drilling fluid density of a coal bed based on a structural element analysis model. The method has the advantages of coal bed cleat and fracture development, big rock brittleness, low strength and obvious anisotropy and discontinuity. The borehole wall instability characteristics of the method are different from those of the common sandstone stratum. The phenomenon that the traditional borehole wall stability model based on the mechanics of continuous media is difficult to be successful for solving coal bed instability problems can be eliminated. In the method, the coal bed is composed of discrete blocks. A coal briquette which has the biggest possibility of generating spallation between surface cleats is analyzed to carry out force analysis. A structural element model of collapse pressure is built by the stressed balance condition among pressure stress, shearing strength and shaft pressure. A coefficient c is introduced to judge the stable relationship of borehole pressure and borehole wall so as to judge the range of the safe drilling fluid density.

The invention provides an automobile rollover stability integrated control method for limit braking working conditions. The correlation of various uncertain factors such as automobile parameters, chassis technical parameters and operating parameters which affect automobile rollover stability is analyzed by applying the robust design theory, the affect of the initial value and the variation of theparameters on the automobile rollover stability is analyzed, a whole preference aggregate function is applied to integrate the variables of the automobile parameters, the technical parameters and theoperating parameters into an automobile integrated robust model by layers, a simplified automobile rollover stability model for the limit braking working conditions is established through a monte carlo method, and self-adaptive automobile rollover stability control for the various limit braking working conditions is achieved, so that the automobile stability for the limit braking working conditions is improved in the aspects of the initial design stage, the manufacturing process and the using process.

The invention relates to the technical field of ship damage stability model tests, in particular to an active control device for ship damage stability model tests, which comprises a ship body model and a driving mechanism, a transparent organic window plate is embedded in the broadside of the ship body model, a damage opening is formed in the transparent organic window plate, and a magnetic steel frame is adhered to the outer end face of the periphery of the damage opening. A magnetic cover plate covers the damage opening, the magnetic cover plate and the magnetic steel frame attract each other, and the driving mechanism pulls the magnetic cover plate to move so that the damage opening can be opened. According to the active control device, active control to multiple damage opening plans can be realized; and according to damage stable model test characteristics and test research contents, real-time switching of various damage opening schemes in waves is realized.

The present invention discloses a distribution network reconstruction method by considering the small signal stability of a comprehensive energy system. The method mainly comprises the steps that: ina region-class comprehensive energy system, the influence of the distribution network reconstruction of various power sources and the small signal stability of the system is considered, a respective small signal stability model is established for various types of power sources in the comprehensive energy system, a final comprehensive energy system model is formed through transformation of coordinates, the small signal stability is added into the distribution network reconstruction constraint, and wind power and photovoltaic output is arranged in a situation when the system operation is the most unstable, so that it is ensured that the comprehensive energy system is more economically operated on the basis of meeting the small signal stability.

The embodiment of the invention discloses a vehicle controller closed loop test system building method, device, equipment and a computer readable storage medium. The method comprises steps: an electronic stability model is generated according to a signal interaction logic of an electronic stability controller; a communication interface of the electronic stability model is defined, wherein the communication interface is used for transmitting signals with a vehicle model and a vehicle controller module; and a closed loop test system is built, wherein the closed loop test system comprises the electronic stability model, the vehicle model and the vehicle controller module in communication connection. According to the method, on the basis of integration of the traditional vehicle controller software and the vehicle model, the electronic stability model can be quickly integrated, the SIL closed-loop automatic test function of the vehicle controller, the electronic stability controller and the vehicle model can be realized, the functions related to the vehicle controller and the electronic stability controller can be quickly verified, and while complex logic function test is met, the testscene effectiveness is ensured, and the test efficiency is improved.

The invention discloses a stability modeling method of a macroscopic traffic flow viscosity model, which is used to solve the technical problem that the existing models are difficult to directly deal with the problem of traffic congestion. The technical solution is to establish a new traffic model on the basis of the existing model to obtain the relationship between traffic congestion and system stability, so as to determine whether there will be traffic congestion or other abnormal phenomena from a macro perspective by using the perspective of global stability , provide a basic basis for traffic control and decision-making, and be directly applied to deal with traffic congestion problems.

The invention discloses a calculation method for calculating ABO3 perovskite stable structure and performance. The method comprises the following steps: firstly, constructing an ABO3 perovskite type material stability model for selected elements at specific positions in the periodic table of elements according to certain method steps; calculating, analyzing and comparing different ABO3 structure formation energy and phonon spectrums, wherein the stability of the structure can be obtained from the thermodynamic direction and the thermokinetic direction, and then calculating the electronic structure thereof to obtain the photoelectric basic performance of the structure. The invention provides a method for judging whether a stable perovskite structure can be formed or not, and the method comprises the following steps: selecting any element (except a radioactive element Ra) from a second main group in the periodic table of elements, and adding a + 4-valent transition metal element (defined as Zr and Ha) and an O element to form a stable perovskite ABO3 structure. If a compound with a stable perovskite structure can be formed, the general performance of the compound can be calculated and predicted through a first principle.

The invention provides a three-acid chemical warehouse goods location layout method based on a particle swarm optimization algorithm, and aims to realize scientific goods layout of a three-acid chemical warehouse aiming at the characteristics that the three-acid chemical warehouse is difficult in layout and easy to cause potential safety hazards due to errors. According to the goods location layout method, a three-acid chemical warehouse safety layout model consisting of a goods location longitudinal stability model and a goods location transverse gravity center stability model is establishedas an optimization objective function, an objective function is optimized through a multi-objective particle swarm optimization algorithm to obtain a three-acid chemical warehouse optimal storage scheme of the storage area length, the storage area width and the storage area chemical stacking number. The warehousing safety can be improved, the cargo warehousing efficiency can be improved, and efficient and stable operation of chemical enterprises is guaranteed.

The invention discloses a confluence area mixed traffic speed cooperative control method based on stability analysis, and the method specifically comprises the steps: forming a vehicle cluster in the form of '1 + N', the '1' representing one intelligent automatic driving vehicle (CAV), and 'N' representing a plurality of following artificial vehicles (HV); constructing an intra-cluster stability analysis model, and analyzing intra-cluster stability conditions; on the premise that the intra-cluster stability condition is met, constructing an inter-cluster stability model and analyzing the inter-cluster stability condition; based on intra-cluster and inter-cluster stability conditions, establishing a cluster cooperation speed control model, and under the condition that the intra-cluster and inter-cluster stability conditions are met, introducing the confluence cluster to smoothly enter the confluence area by controlling the CAV speed. According to the method, the highway confluence area is used as a research object, the speed cooperative control model is constructed on the premise of stability, the accuracy is improved, the traffic flow risk is effectively reduced, the dynamic space occupancy is improved, and tail gas emission is reduced.

The invention discloses a method for discriminating the stability of a near-infrared spectroscopy device. The method comprises a construction process of a standard sample spectrum stability model anda discriminating process of the measured spectrum stability, can be objectively discriminate the stability of an unknown scanning spectrum by constructing a stability model and calculating a stabilityindex of the scanning spectrum, and further can judge, based on the stability of the scanning spectrum, whether or not a near-infrared spectroscopy device that generates the scanning spectrum is operating at a stable state at this moment to achieve the objective judgment of the stability of the near-infrared spectroscopy device. The method has a high discriminating speed, quantifies the judgmentresult, and ensures the stability and high consistency of the operation of all near-infrared spectroscopy devices under a network state.

The invention discloses a method for lean management and stable intelligent calculation of parameters of a generator set. The method comprises the following steps: constructing a parameter input rulebased on the parameters of the generator set; constructing a PSD-BPA data mode based on the generator set model; constructing an intelligent analysis model based on the generator set stability model;and outputting intelligent analysis data of generator set parameter lean management and stability based on the input rule, the PSD-BPA data mode and the intelligent analysis model. According to the generator set parameter intelligent analysis method integrating parameter lean management and stable intelligent analysis, the completeness of data is guaranteed, the accuracy of the data is improved, and the management level of generator set parameters is effectively improved.

The invention relates to the technical field of landslide prevention and control, in particular to a GIS-based large-area three-dimensional slope stability modeling method, which comprises the following steps: S1, inputting data; s2, an r.slope.stability model is established, and an r.slope.stability model is established; s3, testing the number of the ellipsoids; s4, solving the problems of computer memory and operation time; s5, parameterizing the model; s6, result verification and model visualization are carried out; according to the technical scheme of the method, the calculation time and the model result of the three-dimensional slope stability model r.slope.stability based on the GIS are optimized, the safety coefficient and the slope instability probability are calculated, and the time required for large-area slope stability modeling is greatly shortened.