267 results about "Design objective" patented technology

A technique for synthesizing digital circuit designs by incorporating timing convergence and routability considerations. In one aspect, the invention provides a system and programmatic method for generating a circuit design from a functional specification according to at least one design objective. An intermediate representation of the functional specification is formed. The intermediate representation is analyzed for identifying a physical instantiation that will possibly result in unacceptable interconnect delay or congestion. Functional units are allocated from among a plurality of candidate functional units for performing operations of the intermediate representation. Operations are scheduled to occur at specified times on said selected functional units. An architectural representation of the circuit design is formed according to results of scheduling.

Improved topology optimization for engineering product design is disclosed. An engineering product including a design domain to be optimized is defined. Design domain can be a portion of or the entire engineering product. Design objective and optional constraint are also defined such that optimization goal can be achieved. Additionally, initial configuration of the design domain is represented by a finite element analysis (FEA) mesh. Each element or element group is associated with a design variable. A set of discrete material models is created from the baseline material used for the design domain. The set of discrete material models is configured to cover entire range of the design variable and each discrete material model represents a non-overlapping portion. Each element representing the design domain is associated with an appropriate discrete material model according to the design variable. Structure response of entire engineering product is obtained via FEA to evaluate design objective and update design variable.

An optical, wavelet-based fractal modulation of ultra-short light pulses is used as part of a high-bandwidth communications system. The preferred embodiment utilizes the scheme as part of a hybrid wireless optical and RF transmission system for broadband communications among fixed and/or mobile platforms. An ultra-short pulse laser, high-power WDM-ARRAY laser or high-power incoherent light sources may be used. Computer-generated hologram techniques are employed in designing the optical transceiver subsystems for spectral encoding and decoding of wavelet patterns. Part of the design goal is to select a diversity receiver Field-of-View (FOV) in a way that the effects of scintillation are reduced by as much as possible. Compared to existing optical wireless systems, the invention offers a much higher average transmission bit rate and a much smaller bit error rate outage value, thus enabling highly available FSO links. Wireless transceiver will be capable of communications with nearly line-of-sight FSO links and will be more tolerant to shadowing. Also, the optical medium is designed to be more secure than counterparts against any intrusion.

The invention discloses a method for designing the formulation combination of tobacco leaf, which comprises the following steps: the design objective of cigarette products is determined; the requirement for the main chemical composition of the objective is determined; according to the experience, formulation personnel preliminarily select one representative tobacco leaves respectively from base cigarette, auxiliary material cigarette and filler; according to the similarity of the base cigarette and the compatibility of the auxiliary material cigarette and the filler, the rest tobacco leaf materials are selected; the final tobacco leaf materials used for the formulation are determined by the formulation personnel according to the storage rate of tobacco leaf, absolute degree of association and smoke panel test; the formulation cost is taken as evaluation function of fitness, and the proportion of the chemical composition, the main materials, the auxiliary materials and the filler are taken as constraint condition, the genetic algorithm is searched. The invention overcomes the deficiency that the prior art can not ensure the aesthetic quality, product style and flue gas index of the formulation of tobacco leaf to be in accordance with design requirements, and provides a method which supplies multiple formulation combinations that are in accordance with requirements, reduces the cost and lightens the workload of the formulation personnel, thus being widely applied to the field of cigarette production.

Disclosed is an improved method, system, and computer program product for predicting and improving the integrity, manufacturability, reliability, and performance of an electronic circuit feature based on the stresses or strains of design features of electronic designs. Some embodiments identify the design, the concurrent model(s), design feature physical or electrical parameters or attributes, analyzes the stresses or strains to predict the integrity of the design and determines whether the design meets the design objectives or constraints. Some other embodiments make corrections to the designs or the processes based upon the determination of whether the design meets the design objectives or constraints. Some other embodiments compute the variations of the design features as a result of the stresses or strains and determine their impact on the subsequent processes.

An information processing system, computer readable storage medium, and methods with an integrated development environment (IDE) to guide development of applications to implement a programming design objective. A method includes receiving, with a source code editor of the IDE, source code and a tag added to the source code, the tag indicating a programming design objective for the source code. The method includes invoking a source code analyzer that analyzes at least a portion of the source code and outputs a message in response to determining, based at least on the tag and the analyzing, that the at least a portion of the source code fails to conform to one or more constraints of the programming design objective indicated by the tag. One or more hints and proposals to fix the source code are displayed.

The invention relates to a measuring device and a method for detecting thrust vector of a tiny rocket motor used in vacuum. The device for detecting the thrust vector mainly comprises a pressure probe, a movable platform, a rotating table and a data acquisition system. The method comprises the following steps: fixing the pressure probe to the movable platform first, and then adjusting the position of the pressure probe simultaneously, so as to make an axis of the pressure probe parallel to an axis of the tiny rocket motor. When the movable platform moves at constant speed along the direction perpendicular to the axis of the tiny rocket motor, a sensor positioned in the pressure probe senses local dynamic pressure signals in jet current generated by the tiny rocket motor in real time, and the acquisition system acquires and transmits the signals to a data processing and displaying system. Through analyzing symmetry of the dynamic pressure relative to the axis of the tiny rocket motor, the method studies deflection conditions of actual thrust vector and design objective.

Systems, and methods for the design and fabrication of OLEDs, including large-area OLEDs with metal bus lines, are provided. Various bus line design rules for large area OLED light panels may include mathematical models developed to optimize bus line design and/or layout on large area OLED light panels. For a given panel area dimension, target luminous emittance, OLED device structure and efficiency (as given by the JVL characteristics of an equivalent small area pixel), and electrical resistivity and thickness of the bus line material and electrode onto which the bus lines are disposed, a bus line pattern may be designed such that Fill Factor (FF), Luminance Uniformity (U) and Power Loss (PL) may be optimized. One general design objective may be to maximize FF, maximize U and minimize PL. Another approach may be, for example, to define minimum criteria for U and a maximum criteria for PL, and then to optimize the bus line layout to maximize FF. OLED panels including bus lines with different resistances (R₁) along a length of the bus line are also described.

A method, a system and a computer program product for re-using verification results associated with a circuit design to eliminate a formal verification re-run associated with a subsequent verification of the circuit design. A Verification Data Re-use (VDR) utility initiates the creation of a first netlist data structure and a first set of target signatures for the circuit design. The VDR utility initiates an initial functional verification run of the circuit design and stores the results of the verification run. When a subsequent verification of the initial design is initiated, the VDR utility compares the first set of target signatures with a second set of target signatures for the subsequent verification run. A match of target signatures indicates that corresponding design targets have an identical functionality and the VDR utility re-uses verification results from the initial verification run to eliminate an extensive formal verification

The invention discloses a group of large-thickness blunt-trailing-edge wind-power airfoil profiles and a design method thereof. The airfoil profiles have high lift coefficients under operation angles of attack. The airfoil profile group includes four airfoil profiles with relative thicknesses of 45%, 50%, 55% and 60% in sequence and with trailing edge thicknesses of 7%, 9%, 12% and 16% in sequence. Variable working condition design is adopted by the airfoil profile group, design Reynolds numbers of the four airfoil profiles are 4.0*106, 3.5*106, 3.0*106 and 2.5*106 in sequence according to the relative thicknesses, and the design objective mainly aims to take stability, changed along with the Reynolds numbers, of the lift coefficients as main constraint according to change features of the lifting coefficients within the range of large angles of attack in vane root areas. Numerical prediction results indicate that when the four large-thickness blunt-trailing-edge airfoil profiles are in the range of large angles of attack, the lift coefficients ascend continuously and stably and are in a high level. By the airfoil profile group, vane structural strength and stiffness can be improved, and a wind turbine can have high-efficient and stable output.

The invention discloses an underwater robot attitude and position control method based on double-closed-loop active disturbance rejection. The method is characterized by firstly, for a underwater robot, using a momentum and moment theorem and using a conversion relation between a geodetic coordinate system and a body coordinate system to establish a dynamical model; designing the speed loop expansion state observer of the underwater robot to observe unmodeled and external disturbances and carrying out real-time compensation suppression so that the anti-disturbance performance of a speed loop is greatly increased and the robustness of a system is improved; aiming at the high frequency vibration characteristic of the speed loop, using a disturbance observation value to construct a speed loopactive disturbance rejection controller based on nonlinear function feedback; based on a non-linear function fhan, designing the tracking differentiator of a target position signal, giving the transition process and the target speed estimation value of a position signal, avoiding the sudden change of system response and solving the conflict of rapidity and overshoot; and designing a underwater robot position loop proportion-differential controller based on position deviation feedback, wherein the controller is suitable for engineering application.

The invention relates to a measuring device and a method of the thrust vector of a detection space plasma thruster. The measuring device of the thrust vector mainly comprises an electrostatic probe, an electrostatic probe regulating mechanism, a locating piece and a data acquisition and processing system. The method comprises the following steps: first fixing the electrostatic probe on a movable platform, simultaneously regulating the position of the electrostatic probe, installing the locating piece on the position which the probe can contact when the axis of the probe coincides with that of the plasma thruster, collecting the electrons jetted on the local position by the thruster in real time by the electrostatic probe on which positive bias voltage is applied when the movable platform moves at a constant speed along the direction vertical to the axis of the thruster, thus collecting the voltage signals at both ends of sample resistance in real time by the data acquisition and processing system when current flows through a probe circuit, and educing deflection of the actual thrust vector from the design objective by comparing the differences between the time corresponding to the vertex of the voltage signals at both ends of the sample resistance and the sudden change time of the voltage signals at both ends of the locating piece according to the moving speed of a translation stage and the distance from the electrostatic probe to the exit of the thruster.

The invention relates to a method for constructing an access control policy and a system thereof which are applied to field of the safe operation system, in particular to a policy compiler for realizing the method for constructing the access control policy. Based on the analysis and the research on the classical safety model, the invention provides the method which has common and special safety rules and is used for constructing the universal access control policy, and provides the policy compiler which can realize the functions of syntax check, semantic analysis and the like, comprises a retargetable back end and is applicable to the multiple operating system environments by setting the method as the design objective of the language of the policy compiler in the system, adopting the object-oriented design concept and determining the lexical and syntax standard methods of the language. The invention has the prominent advantage that a method of the universary description on policy elements and safety rules is used to support multiple security models.

The invention provides a structure optimization design method which comprises the following steps: establishing an optimization design objective function and constraint conditions; establishing structure optimization design regions; initializing an optimization model; carrying out structural finite element analysis on the model, and calculating values of the objective function and the constraint equation according to the analysis result; analyzing the shape sensitivity, and updating the model in an appropriate evolution algorithm according to the analysis result; and carrying out other operations to ultimately obtain the optimal structure model. The invention also provides a software system using the optimization design method. The software system sufficiently implements the optimization algorithm and simultaneously provides a favorable user interface and a data interface. The optimization design method and system provided by the invention can be directly used for computer-aided design, has low grid dependence and is applicable to various common objects.

The invention discloses a weaving method for a truncated cone-shaped fabric. The fabric comprises a warp system and a weft system, wherein the warp system and the weft system are mutually interwoven to a multi-layer angle-interlocking structure. The weaving method comprises the following steps: 1, initially arranging warps; 2, moving to drive the warps to form sheds; 3, introducing wefts; 4, adding warps; 5, secondarily moving to drive the warps to form sheds; 6, secondarily introducing the wefts; and 7, repeating the steps 4 to 6. The integral density uniformity of the fabric woven by the weaving method disclosed by the invention is remarkably improved; the performances at yarn adding points completely satisfy the design objective requirements according to the compounded performance test; and the technical problem that through holes are formed at the yarn adding points caused by the existing yarn adding process is solved. According to the weaving method disclosed by the invention, the whole-row yarn adding process structure is complete, the fibers are continuous, and the forming speed is high, thereby realizing two yarn adding technologies in a weaving process that a 2.5D woven structure is continuously increased with the increase of the diameter of the section of a truncated cone.

The invention discloses a design method for a vehicle body front-end structure with vehicle front surface 25% overlapping ratio collision, and aims to solve the problems of design blindness in an existing optimization design process for vehicle body front-end members with vehicle front surface 25% overlapping ratio collision, and repeated modeling and long calculation time during adoption of a CAE technical means in the optimization design process. The design method for the vehicle body front-end structure with the vehicle front surface 25% overlapping ratio collision comprises the steps of 1, building an equivalent simplified model of a vehicle: 1) extracting a stiffness characteristic and an inertia characteristic; 2) parameterizing the extracted stiffness characteristic and inertia characteristic; 3) clearly determining a simulation mode of an equivalent simplified model of each member of the vehicle body front-end structure; 4) simplifying a front longitudinal beam, a front fingerboard and an auxiliary frame; 5) processing other parts of a vehicle body; and 6) verifying the equivalent simplified model of the vehicle; 2, obtaining an anti-collision design objective of the vehicle body front-end structure; 3, designing the front longitudinal beam, the front fingerboard and the auxiliary frame; and 4, performing simulation verification on front surface collision resistance of the vehicle body front-end structure after optimization design.

The invention discloses a method and a device for controlling a redundant mechanical arm. The method includes the steps of obtaining current point information and target point information of the redundant mechanical arm; determining a trajectory function corresponding to movement trajectories of the redundant mechanical arm moving from the current points to the target points according to the current point information and the target point information; establishing an equation corresponding to the trajectory function by adopting redundancy space vectors as independent variables; and solving the equation corresponding to the trajectory function according to a target approach method and obtaining the position and the speed of each joint in the redundant mechanical arm corresponding to the movement trajectories. According to the technical scheme, on the premise that a global optimal solution meeting design objectives is obtained, a search space for a multi-objective optimization problem of the redundant mechanical arm can be reduced, dimension explosion problems in the multi-objective solving process can be avoided, calculation amount needed in the control process of the redundant mechanical arm can be simplified, and the reaction speed of the redundant mechanical arm can be increased.

The invention discloses a low-voltage current limit and PI control unit coordination optimization method for high-voltage direct-current transmission. The low-voltage current limit and PI control unit coordination optimization method for the high-voltage direct-current transmission includes steps that 1, designing objective functions capable of reflecting the dynamic reactive power change rate of converter consumption of a direct current system, the active power change rate of transmission and the reactive power peak value; 2, confirming optimization parameters of the low-voltage current limit and PI control unit of a direct-current control system, confirming decision variables of the low-voltage current limit control unit as optimization parameters, and forming an optimizing feasible region; 3, designing an electromagnetic transient time domain simulation optimization method according to an optimization object, wherein the electromagnetic transient time domain simulation optimization method has strong adaptability to the variable optimizing feasible region of the object; 4, comparing the reactive power consumption and active power restoration effects of the converter before and after optimization, if the result is reasonable, returning to the step 3, resetting initial optimization values, otherwise, returning to the step 2, and correcting the optimizing feasible region. The low-voltage current limit and PI control unit coordination optimization method for the high-voltage direct-current transmission accelerates the reactive power demand reduction at the reactive power demand faltering stage and always fastens the active power restoring in the restoring process.

Disclosed is a structural dynamic design method for a high-pressure rotor of an aircraft engine. The relationship between high-pressure rotor model design parameters and rotor vibration characteristics is determined, so that the design method and criterions are provided for dynamic design of the high-pressure rotor, and the method is of great guiding significance to the design of the high-pressure rotor of the aircraft engine. The method includes: establishing a dynamic model and a dynamic equation of the high-pressure rotor to obtain a nondimensionalization characteristic equation; introducing an equivalent critical speed, and determining a two-order critical speed range of a high-pressure rotor system according to the equivalent critical speed; changing a conventional equilibrium amount configuration method by configuring residual disequilibrium amount phases; configuring a ratio of rotor pole rotation inertia to mass center rotation inertia in design according to a specific design objective; establishing configuration criterions for a rotor bearing stiffness ratio. A conventional design process is changed, structural dynamic active design of the high-pressure rotor is realized, the design process is optimized beneficially, design cycle is shortened, and the method has important construction value.

The invention discloses a method for rapidly determining the tolerance of a hexagonal active phased-array antenna structure based on electromechanical coupling. By the adoption of the method, the problem that when a hexagonal active phased-array antenna structure scheme is designed, the tolerance with a distribution structure is difficult to determine rapidly is solved. The method comprises the steps that the structural parameters and the electromagnetic working parameters of a hexagonal active phased-array antenna are determined; based on an electromechanical coupling model, the electrical performance of the antenna with position installation errors existing in the X-axis direction and the Y-axis direction of an array element respectively and a height error existing in the Z-axis direction is calculated; the deterioration amount, existing when the errors exist, of the electrical performance of the antenna relative to the electrical performance required by the design is analyzed; according to design objectives, the position installation precision of the array element and the array surface flatness are determined, and therefore the tolerance of the hexagonal active phased-array antenna structure is rapidly determined. The method is suitable for rapidly determining the tolerance of the hexagonal active phased-array antenna structures with different frequency bands; by the adoption of the method, deciding and distribution of the position installation precision and the array surface flatness of the hexagonal active phased-array antenna can be guided, and the design scheme of the antenna structures can be evaluated.

The invention discloses a single-user large-scale antenna relay system power allocation method based on energy efficiency optimization. A communication system consists of a single antenna information source node, a single antenna information sink node, and a relay node transceiver configured with a large scale of antennas, and is shown in accompanying drawings in the summary. According to the method, a mathematical optimization model taking transmitting powers of the information source node and a relay node as design variables is built specific to a design objective of system energy efficiency maximization under a constraint condition of satisfying specified system quality of service (QoS). Since an accurate analytical expression is unavailable for an objective function in an optimization problem, an accurate approximate analytical expression of the objective function is obtained by means of a law of large numbers in a large-dimension random matrix theory. Then, a non-convex objective function is transformed into a convex function through interval approximation equivalence with a large signal-to-noise ratio. Through a Lagrange dual function convex optimization algorithm, a closed-form solution of a power allocation scheme is obtained finally by means of a Lambert W function, so that solving of the optimization problem with an alternate iteration method is avoided.