57results about How to "Guaranteed design accuracy" patented technology

The invention discloses a production technology and structure of a modified automobile box sand core, and relates to the technical field of sand core production. The production technology and structure of the modified automobile box sand core aim to solve the problems that complex slender sand core parts produced through existing sand core production technologies are low in structural strength, and produced sand cores are difficult to exhaust. The production technology comprises the steps that molds are prepared; resin sand is added into a sand hopper of a core shooter; shooting and shaping are conducted; curing and shaping are conducted; the molds are opened for cooling sand core parts; a main sand core is hollowed out; a water channel sand core, a small water channel sand core, a lug sand core, a cross-shaped sand core and the main sand core are assembled to form a sand core structure of a box mold, and the small water channel sand core and the water channel sand core in the sand core structure produced through the sand core production technology are connected with the main sand core through sand core bosses separately. The production technology of the modified automobile box sand core is characterized in that by implementing the sand core production technology, the mould-filling density and the compaction density of the sand mould parts can be effectively improved, sand corepart breakage is prevented, the sand core is well shaped, the exhausting effect of the sand core can be effectively improved, and the collapsibility of the sand core can be perfected.

The invention discloses an optical power self-correction method for a fiber-optic gyroscope and a high-precision fiber-optic gyroscope using the method. The method comprises the following steps: extracting optical interference signals, collecting comb-type peak values Di when a bias phase position in the optical interference signals is close to 0, integrating the collected N comb-type peak values Di to obtain Dint, comparing Dint with the optical power value of a fiber-optic gyroscope working stably, and controlling power source driving current according to the comparison value so as to further adjust the output optical power of a light source. By the method, on the conditions that no extra device is use and reciprocity of light paths is not changed, the optical power of the light source is detected in an end-to-end manner, closed-loop control is implemented so as to realize the high-precision control on a low-cost SLD (super luminescent diode) light source, and the stability of output wavelength is improved. The high-precision fiber-optic gyroscope using the method does not need an expensive ASE (amplified spontaneous emission) light source, thereby greatly reducing the production cost.

The invention discloses a high-dimensional optimization and type selection method of an impeller facing a multi-layer perceptual structure, which belongs to the field of big data learning models. The invention firstly reduces the dimensionality of design variables through sensitivity analysis, and then uses the distributed computing capability of the cloud platform to obtain a large number of simulation samples based on coupled computational fluid dynamics (CFD) to train the multi-layer perceptron (MLP) and obtain big data learning model. Then, based on the big data learning model, continue to use the non-dominated sorting genetic algorithm (NSGA-Ⅲ) on the cloud platform to perform cloud computing and high-dimensional multi-objective global optimization of the design variables, and then use the adjoint method to continue to optimize the overall impeller type for the global optimization results. The line is improved to realize the high-dimensional multi-objective optimization of the performance of rotating machinery. The invention organically combines cloud computing and big data learning models, can quickly and accurately converge to the global optimal solution of the high-dimensional optimization target, and at the same time ensures the design accuracy and greatly shortens the design cycle of the rotating machinery.

The invention discloses a multifunctional glare source device for simulating the scene environment of a street lamp, which comprises a main panel of a glare source, on which a plurality of groups of light outlet holes are symmetrically arranged, and a uniform light source with a corresponding luminous area is installed, and the main panel of a glare source The four sides are obliquely installed with an upper baffle, a lower baffle, a left baffle and a right baffle, and a design method for a multifunctional glare source simulating the scene environment of a street lamp is also disclosed. The arrangement of lamps in the present invention fully conforms to the principle of perspective , which is more suitable for the actual street lighting environment, not only can calibrate the instrument for measuring threshold increment (TI), but also can calibrate the instrument for measuring unified glare value (UGR) and glare value (GR), with wide application range, high economy and high selection Uniform lamps are used as the light source, and the uniform reflected light of the main panel of the glare source and the surrounding baffles is used to simulate the background light source to ensure the design accuracy.