36results about How to "Efficient design method" patented technology

The present invention discloses a single-layer vibration isolation system design method for power equipment. The method comprises the following steps: testing a vibration property of a vibration source of power equipment so as to acquire an excitation frequency and a vibration isolation performance parameter of the vibration source; acquiring an inertial parameter of the power equipment; determining the number of vibration insulators and a constraint condition in a single-layer vibration isolation system; establishing an optimization objective function of a vibration isolation rate and a comprehensive decoupling rate; and establishing a multi-body dynamics model and optimizing calculation of a single-layer vibration isolation system design by using a particle swarm optimization algorithm. According to the single-layer vibration isolation system design method for power equipment provided by the present invention, the two design objectives, the vibration isolation rate and the decoupling rate, are both considered, so that with the vibration isolation rate being ensured, a coupling effect of a rigid body mode of each order is effectively lowered. The vibration isolation performance of a vibration isolation system can be truly improved. No repeated commissioning is required in the design process; an acquired design parameter is of an optimal value; an effect evaluation parameter will definitely meet the requirement of specifications; and a design result is accurate and highly efficient.

The invention discloses a method for designing an efficient duct and relates to the field of designing of a ship propelling system. Ducted propellers are applied to ships with heavy loads more and more widely. A duct is one of key components of the ducted propeller. The research direction can be that the efficient ducts are found, so that the method for designing the efficient duct is provided and based on a duct parameterization expressing method. According to the efficient duct designing method, the linetype of the duct is expressed in a parameterized mode, and the efficient duct is designed according to a CFD calculation method. By the adoption of the method for designing the efficient duct, the efficient duct can be conveniently and rapidly designed.

The present application discloses a circuit and method for solving the loss-of-lock and wrong-lock of broadband mixing phase-locked loops, and relates to the technical field of microwave frequency synthesis, wherein the circuit includes: a phase detector, a loop filter, a voltage-controlled oscillator, a broadband Mixer, voltage preset circuit, clamping circuit and single-pole single-throw switch; the output end of the phase detector is connected with the input end of the loop filter, and the output end of the loop filter is respectively connected with the The input end of the voltage-controlled oscillator, the output end of the voltage preset circuit, the output end of the clamping circuit are connected to one end of the single-pole single-throw switch, the other end of the single-pole single-throw switch is grounded, and the voltage-controlled oscillator The output terminal of the detector outputs a signal, and after the signal is mixed with the local oscillator input signal through the broadband mixer, a mixed intermediate frequency signal is obtained, and the mixed intermediate frequency signal is input to the other input terminal of the phase detector. The application can quickly pull the initial frequency difference of the phase-locked loop into the locking band of the frequency phase detector, effectively reducing the locking time.

The invention discloses a sand dune-like microstructure with high-efficiency air drag reduction function on the surface and an optimization design method thereof. First, the method of computational fluid dynamics (CFD) is used to construct the transverse array of dune-like microstructure in the flow field region,. The drag reduction rate was obtained by using Reynolds average numerical simulation(RANs) and Fluent solver, and with the total pressure drop as the calculation index. Finally, the dune-like microstructure parameters with high-efficiency air drag reduction function were optimized tomeet the expected goal. Compared with the traditional biomimetic drag reduction microstructure, the dune-like microstructure design method with high-efficiency air drag reduction function provided bythe invention has the universality for different flow field states. In addition, the method provided by the invention can save the design cost, shorten the design cycle, reduce the design loss, and provide a certain reference for the aerodynamic structure design of the aircraft.

The invention discloses a scaling-theory-based design method of high-performance absorber. The method comprises: S1, on the basis of a prototype wave-absorbing material, corresponding electromagneticparameters and a corresponding prototype frequency are obtained, wherein the electromagnetic parameters include a dielectric constant and a magnetic permeability; S2, according to a reflectivity calculation theory of multi-layer materials, impedance characteristics and changing rule functions of all layers of materials are analyzed by combining the electromagnetic parameters and the prototype frequency of the prototype wave-absorbing material, thereby obtaining an impedance characteristic function; and on the basis of a scaling theory, a scaling material having the shape same as the prototypewave-absorbing material is prepared and scaling electromagnetic parameters and thicknesses of all layers of materials are theoretically designed based on the impedance characteristic parameters; S3, ascaling frequency coefficient and a shape ratio factor are determined to obtain a material prescription meeting the impedance characteristic; and S4, a needed high-performance absorber is constructedby using the material prescription. The method has the following advantage: the quick design of a broadband absorbing material is realized.