11results about How to "Reduce Design Risk" patented technology

The invention relates to the technical field of chip design, in particular to a timing constraint automation generation method. According to the method, the actual demand of the clock needing to be created is determined based on the design document, and then the clock list is generated based on the actual demand; the content of the clock list comprises a PLL source, a clock type, a clock name, a source path, a main clock name, a main clock source path, a frequency, a main clock duty ratio, a derivative clock duty ratio, a frequency division coefficient, whether the clock has a cross-clock requirement or not, and the mutual relation between the created clocks; executing the script in a clock list which needs to be read by the configuration script and the specified script; and traversing all options in the clock list by the script, generating a time sequence constraint, and automatically finishing GCA check. According to the method, timing constraint compiling and checking can be automatically achieved through the script only by completing output of the clock list, and the method for compiling the timing constraint is accurate and easy to maintain.

The invention discloses a self-adaptive ultra-large field-of-view infrared image non-uniformity correction method, and belongs to the field of infrared image quality control. Firstly, an infrared camera laboratory radiometric calibration coefficient is used as correction input, initial parameters of non-uniformity correction are obtained through multi-scene image statistics, and then detector response with an ultra-large view field center and stable response is selected as a standard reference standard. Correcting the correction parameter of each pixel towards the two sides of the detector by adopting a specific sample matching technology according to a standard reference datum to finish the non-uniformity correction of a single detector module, then establishing a high-precision overlapping region correlation detection constraint model for adjacent detectors, and performing feature point matching correction by utilizing the overlapping pixels of the adjacent detectors to finish the non-uniformity correction of the single detector module. Correction parameters between adjacent detector modules are obtained and transmitted in sequence, so that gray level balancing of the multiple detector modules of the infrared camera is achieved, finally, full-field-of-view image self-adaptive dynamic stretching is achieved through histogram statistics, and non-uniformity correction of the whole image is achieved.

The invention provides an aircraft power system selection method, device and equipment based on multi-objective optimization. The method provided by the invention comprises the following steps: taking maximization of global fitness as a target; constructing a target optimization problem by taking a first constraint condition that the thrust of the power system meets a preset minimum flight requirement, a second constraint condition that the total weight of the power system cannot exceed a structural upper limit, and a third constraint condition that the total cost of the power system cannot be lower than a preset maximum economic cost; constructing a fitness function of the target optimization problem; solving an optimal solution of a target optimization problem by taking maximization of global fitness as a target according to the fitness function, and determining the solved optimal solution as a selected power system; the position of the continuous variable is updated based on a particle swarm optimization algorithm. The aircraft power system selection method based on multi-objective optimization is used for automatically selecting the most suitable power system at the initial stage of aircraft design, and intelligent matching of the power system is achieved.

The present invention discloses an independently arranged auxiliary speed change transmission system, which is arranged separately in a housing connected to an engine, and includes a power input shaft, a power output shaft, a driven gear shaft matching the power input shaft and the power output shaft, and a primary gear pair connecting the power input shaft and the driven gear shaft, and a secondary gear pair connecting the driven gear shaft and the power output shaft, wherein the primary gear pair and the secondary gear pair are connected by a wet clutch or a synchronizer or a meshing sleeve, and the shifting function is realized in three different shifting modes. The present invention can be arranged independently, and can realize different functions and adapt to different operation requirements by flexibly changing a variety of structural modes, and has a wide range of applications and meets market demand. At the same time, the bearing load condition is relatively clear, and the reliability of the bearing after selection is relatively high. The lubrication system matched with it can also be independently designed on the basis of an independent structural arrangement, and is less affected by the main speed change transmission and the auxiliary speed change transmission, and the use performance is more reliable.

The invention discloses a coaxial line light source for high-precision line scanning detection and a design method thereof.The light source is composed of two oblique-illumination line light sources which are in mirror symmetry, and a uniform line divergent beam emitted by an LED lamp panel of any oblique-illumination line light source irradiates a concave cylindrical reflector of the oblique-illumination line light source firstly and then irradiates the concave cylindrical reflector of the oblique-illumination line light source; the concave cylindrical surface reflector converges the uniform line divergent light beams into uniform line convergent light beams, the uniform line convergent light beams are turned and reflected to the plane reflector of the oblique illumination line light source, then are turned and reflected again by the plane reflector, are diffused by the elliptical light diffusion plate of the oblique illumination line light source, and finally irradiate on a light emitting surface G of the coaxial line light source in a crossed manner; and the light beams are superposed on the symmetrical center line of the light-emitting surface G to form an illumination line light beam with the characteristics of intersectionality, inclined irradiation and line uniformity. Compared with a traditional line light source, the coaxial line light source can be better applied to a high-precision line scanning detection scene.

The invention provides a method and system for determining ultimate bearing capacity of an ocean jacket type platform, and relates to the technical field of ocean engineering.The method comprises the specific steps that environmental parameters, structural parameters and load parameters of the platform are collected; based on dimensionless processing, generating a corresponding environmental influence index, a material influence index and a load index; carrying out fusion and correlation analysis on the three indexes to obtain a comprehensive bearing capacity evaluation index; and determining the ultimate bearing capacity of the ocean jacket type platform by combining the bearing capacity evaluation index and the safety coefficient of the material. According to the method, the environment influence index, the material influence index and the load index are fused through dimensionless processing and correlation analysis, the actual bearing capacity of the platform under the complex ocean condition can be reflected more accurately, and therefore the design risk is reduced. Besides, the final bearing capacity is determined by combining the safety coefficient of the material, so that the safety and reliability of the platform are improved, the maintenance cost is reduced, and the service life is prolonged.

The present application relates to an embedded core board and equipment. Among them, a processor, a first type connector, a second type connector, a third type connector, a fourth type connector, a memory module and a storage module are provided on the substrate body of the embedded core board. The processor is respectively connected to the first type connector, the second type connector, the third type connector, the fourth type connector, the memory module and the storage module; wherein the first type connector is used to transmit communication interface signals; the second type connector is used to transmit high-speed signals; the third type connector is used to transmit multimedia signals and storage signals; the fourth type connector is used to transmit PRU signals. Based on the above structure, the embedded core board has the basic functional requirements of embedded products, which can avoid repeated design during embedded product development and avoid wasting manpower and material resources; and reduce the design risk of the product, shorten the product development time, speed up the product development speed, and improve the product development efficiency.

The invention discloses a compression and decompression test platform and method based on special hardware, virtual electronic equipment and a storage medium, the platform is deployed in a computing system comprising a special compression and decompression hardware unit, and a kernel mode driving module is in communication connection with the special compression and decompression hardware unit. The user mode test program module is connected with the kernel mode drive module through a character device interface; registering a character device to create an interface with the dedicated compression / decompression hardware unit; in response to a user mode instruction received through character equipment, distributing a source data buffer area and a target data buffer area through a DMA-BUF HEAP mechanism; establishing a zero-copy shared memory channel of a user mode and a kernel mode; writing the to-be-tested data into a source data buffer area; allocating a shared memory buffer area and managing for compression and decompression operations by utilizing a DMA memory management mechanism of the kernel; and determining a test mode, processing the target and outputting a test result. Repeated development of test tools is avoided, and cost is saved.

The present invention provides a chip performance test fixture, including an electric control board, a signal input terminal, a signal output terminal, and a plurality of test terminals. Among them, a signal test circuit is arranged on the electric control board, including a first parallel mounting position, a second parallel mounting position, a plurality of strobe mounting positions, a series mounting position, a first signal line, a plurality of second signal lines, and a third signal line. The first parallel mounting position, the second parallel mounting position, and the series mounting position are all used to access a connecting element; the lengths of the plurality of second signal lines are different, and the plurality of strobe mounting positions are used to select the second signal line through which the test signal passes when accessing a connecting element. The present invention realizes the simulation of the line path of chip signal transmission in an actual project, verifies its signal performance, reduces the chip selection error rate, shortens the R&D design cycle, and reduces the R&D cost.

The invention provides a method and device for calculating the flight load of a carrier rocket along a trajectory, and the method comprises the steps: firstly obtaining aerodynamic load data in different states, and then obtaining the aerodynamic load data of a whole rocket substation at any moment through an interpolation function; calculating the flight load of each substation at any moment and the equivalent load of each substation at any moment of the rocket according to rocket flight characteristic parameters in the upstream trajectory data and the aerodynamic load data of the whole rocket substations, so as to quickly calculate the maximum load of each substation cabin section of the trajectory; and the load change characteristics of each substation cabin section in the whole flight process are obtained, and then the maximum load of each substation cabin section is obtained through screening, so that the obtained load result does not have the problem of maximum load state omission, and the design risk can be greatly reduced.