30results about How to "Short simulation time" patented technology

The invention discloses a method for simulating deposition on the basis of deposition process control of reference planes. The method includes analyzing deposition environments of deposition zones by the aid of well logging, mud logging and rock core information and determining change conditions of the reference planes and ancient landform conditions by the aid of burial history information; inputting ancient landforms into hydrodynamic models as initial landforms according to ancient landform analysis, simulating and reconstructing hydrodynamic characteristics of research zones, simulating and reconstructing transportation and deposition of sediment on the basis of hydrodynamic research according to sediment transport and diffusion equations, constraining deposition and denudation of deposits by the aid of the reference planes on the basis of transportation and deposition of the sediment, superposing deposition and denudation of the deposits on the initial landforms to be used as landforms for next simulation so as to carry out cyclic processes for simulating and reconstructing deposition. The method has the advantages that conditions of conditions of the reference planes are considered in simulation processes, and accordingly deposition at basin level can be simulated; the method is short in simulation time, and correction can be repeatedly carried out until requirements of geological characteristics are met.

The invention discloses a time synchronization method in a system of an optical orthogonal frequency division multiplexing-based passive optical network (OOFDM-PON). The scheme comprises an optical line terminal (OLT) and an optical network unit (ONU), wherein the OLT comprises a laser, a modulator, an OFDM signal generating module and an optical multiplexer. The ONU comprises an optical demultiplexer, a time delay compensator, an optical detector and an OFDM receiving module. At the transmitting end of the OLT, optical signals for modulating optical OFDM signals and timing information are divided into two branches. The optical signals are divided into two branches after transmitted by optical fibers, wherein a timing signal is extracted from the branch for carrying the timing information by the optical detector after time-delay compensation, and the OFDM signals are accurately received at the receiving end of the ONU. The invention has the characteristics of simple design principle, easy realization, low cost and the like.

In a simulation step, based on information of a main surface shape of a transparent substrate and shape information of a mask stage of an exposure apparatus and using a deflection differential equation taking into account a twist deformation, height information at a plurality of measurement points is obtained by simulating a state where the transparent substrate is set in the exposure apparatus. Based on the height information obtained through the simulation, a flatness of the transparent substrate when it is set in the exposure apparatus is calculated in a flatness calculation step. Then, by judging in a selection step whether or not the calculated flatness satisfies a specification, the transparent substrate whose flatness satisfies the specification is used as a substrate for a mask blank.

The invention discloses a calculation method for path losses during a single scattering process in non-line-of-sight ultraviolet communication. The method comprises: step one, parameters of a transmitting terminal and a receiving terminal are set, an area V' and a public scattering body V are defined, and a range of the V' is solved; step 2, the area V' is divided into a plurality of micro elements and coordinates of the micro elements are obtained in a spherical coordinate frame; step three, traversal of the area V'is carried out and the area V' is segmented into a plurality of micro elements V'', whether the micro elements V'' are in the public scattering body V is determined, and if so, the energy that is scattered by the micro elements V'' and then is received by Rx is calculated and is added, and calculation is carried out to obtain the total energy received by the Rx, so that a path loss value is solved. According to the provided calculation method, the simulation time is short; the path loss of the communication system is calculated easily; and the fitting with a simulation result of an MC method is high.

The invention discloses a numerical simulation method for a multi-pass rolling process of an ultra-thick plate blank. The numerical simulation method comprises the following steps: establishing a numerical simulation system; inputting boundary conditions, material parameters, process parameters and simulation control parameters into the numerical simulation system; wherein numerical simulation iscarried out on the ultra-thick plate blank through the rolling processes of all passes, a finite element method is adopted for carrying out numerical simulation on the plate blank to make contact withan upper roller and a lower roller to enter a bite unstable-state deformation rolling stage, and adopting an Euler grid finite volume method for carrying out numerical simulation on the plate blank to enter a stable-state deformation rolling stage; numerical simulation completion. According to the method, the whole rolling process of the ultra-thick plate blank can be accurately simulated, the simulation precision is high, the simulation operation time is short, and a reliable numerical basis is provided for making an optimal and reasonable rolling process scheme.

The invention discloses a jitter tolerance simulation verification method of a clock data recovery circuit. The jitter tolerance simulation verification method is implemented through the following three modules: a test data generating module, a clock data recovery (CDR) circuit and an error code detection module, wherein the test data generating module generates a pseudo random sequence superposed with jitter information as an input of the CDR circuit, consists of a jitter modulating clock and a pseudo random code generating module, and is implemented via VerilogA language design; the error code detection module performs an error code detection on an output data file of CDR simulation, and is implemented through Python scripts. The jitter tolerance simulation verification method comprises the following two steps: first, simulating the test data generating module and the CDR circuit to obtain the output data file of the CDR; then, performing the error code detection on the output data file by using the error code detection module. By the jitter tolerance simulation verification method, the jitter resistance of the CDR is evaluated in a design stage, so that tape-out risks are effectively reduced; in addition, the jitter tolerance simulation verification method is easy to implement and short in verification time and has relatively strong practicability.

The invention discloses a simulative navigation data generation method and a client. Specifically, the method is applied to a client equipped with a navigation tool, and the client has a display area. The method includes: starting the navigation tool of the client to conduct navigation simulation, and acquiring the navigation route; acquiring at least one segment information by segmentation of the navigation route; establishing an interpolation model on each segment route corresponding to the at least one segment information by means of variable speed simulation; inserting simulative navigation data into each segment route according to the interpolation model by means of interpolation; and outputting and displaying the simulative navigation data in the display area.

Multiple mass points are generated on a designed virtual garment and stable conditions of the multiple mass points are simulated by elastic force between the mass points and force exerted between a human body model and the mass point. A result of the simulation is displayed on a display device and, when the design is changed, a distance at which the elastic force becomes zero is changed so that a simulation of the stable conditions of the mass points is carried out again. Thus, even if the design of a garment is changed, a real time and precise simulation can be carried out.

The invention discloses a method and a system for judging the subsynchronous/super-synchronous oscillation stability of a doubly-fed wind power grid-connected system. According to the method, a multivariable frequency domain analysis theory is introduced into the field of subsynchronous/super-synchronous oscillation analysis and control of the doubly-fed wind power grid-connected system, and the method has the advantages of being small in calculated amount, short in simulation time, simple and visual in analysis, high in physical significance, easy to control analysis, judgment and processingof the system and the like; the diagonal dominance and the stability of the control system can be visually analyzed, judged and processed by utilizing a Geiger circle belt to draw a graph; besides, onthe basis of ensuring the stability of the multivariable system, control design can be carried out according to a univariate system, and crosslinking is inhibited while the multivariable control system with good performance is designed; the method can be applied to dynamic stability analysis and control of the wind power grid-connected system, the dynamic stability of the wind power grid-connected system is judged, subsynchronous/super-synchronous oscillation is restrained, and the stability of the system is enhanced.

The invention discloses a human body communication channel modeling method and system. The method comprises the following steps: dividing a human body into a skin layer, a fat layer, a muscle layer and a skeleton layer from the whole; establishing models of the skin layer, the fat layer, the muscle layer and the skeleton layer; and combining the skin layer model, the fat layer model, the muscle layer model and the skeleton layer model to form a complete human body model. The human body communication channel modeling method provided by the embodiments of the invention is not only short in simulation time, but also is higher in simulation accuracy.

The invention relates to an equivalent sound source simulation method of a loudspeaker, and belongs to the field of spaceflight sound vibration testing. Aiming at the problems of low efficiency and high difficulty in a sound source simulation calculation process, the invention discloses an equivalent sound source simulation method of a loudspeaker, and aims to reduce the sound source numerical simulation difficulty of the loudspeaker and improve the calculation efficiency. According to the method, the sound source of the loudspeaker is equivalent to the speed boundary, the sound pressure of the diaphragm of the loudspeaker is firstly measured through an experiment, and the sound pressure is converted into the mass point speed according to a theoretical formula to be defined on the corresponding speed boundary surface, so that the excitation effect consistent with that of the loudspeaker is generated. According to the equivalent sound source simulation method, the complete modeling process of the loudspeaker can be omitted, factors such as loudspeaker diaphragm materials and constraints do not need to be arranged, the sound-vibration coupling calculation process of the diaphragm is omitted, and the calculation efficiency is improved. The method can be used in simulation of acoustic testing, so as to further guide the development of the experiment.

The invention relates to a high-speed switch valve simulation sound field modeling method coupling high-frequency collision and fluid impact, which comprises the following steps: S1, performing electromagnetic, liquid and solid physical field coupling modeling through a high-speed switch valve; acquiring high-frequency collision excitation source data of a valve core and a valve seat as well as a moving armature and an iron core and fluid impact excitation source data of pressure impact and cavitation impact on the inner wall surface of a coupling valve body; S2, taking high-frequency collision and fluid impact excitation source data as input, analyzing a vibration transmission path, performing transient vibration response modeling of the high-speed switch valve, and obtaining surface vibration response data of a shell of the high-speed switch valve; S3, by means of the shell surface vibration response data, completing high-speed switch valve sound field modeling through a transient boundary element method, and obtaining high-speed switch valve sound field data. According to the method, electromagnetic, liquid and solid physical field coupling modeling of the high-speed switch valve is accurately achieved, fluid and mechanical excitation sources are comprehensively obtained and coupled, sound field data of the high-speed switch valve are rapidly and accurately predicted, and the research and development period of the high-speed switch valve is shortened.