30results about How to "Effective guidance design" patented technology

Provided is a method for determining the unlocking critical charge quantity of a separation nut. The method for determining the unlocking critical charge quantity of the separation nut comprises the steps of (1) carrying out M cold air separation tests in the state of pre-tightening torque for design and installation of the separation nut, recording a cold air pressure value at the unlocking moment of the separation nut during each cold air separation test, and obtaining a mean value P of the cold air pressure values at the unlocking moments of the separation nut during the M cold air separation tests through calculation, wherein the M is no smaller than 20; (2) determining energy RT which can be generated by the unit mass of main charge according to the type of main charge of an igniter adopted for the separation nut, and estimating the critical charge quantity m[M] of the separation nut through the formula , wherein the V represents the capacity of an unlocking containing cavity of the separation nut; (3) determining the minimum main charge quantity of the igniter adopted for the separation nut according to the critical charge quantity estimation value m[M] obtained through the step (2) and on the basis that the effective charge compacting density is ensured. According to the method for determining the unlocking critical charge quantity of the separation nut, the test cost of critical charge quantity exploration tests of the separation nut can be greatly reduced, the test period of critical charge quantity exploration tests of the separation nut can be greatly shortened, and the design of the charge quantity of the igniter of the separation nut can be effectively directed.

The invention relates to a novel method of building a structure-activity relationship model of modified biomaterial adsorbing heavy metal ions and application thereof. The method includes the steps of 1, selecting biomaterial which is low in price, easy to obtain and rich in lignocellulose; 2, measuring an index of removal rate of heavy metal ions in water by means of a series of physiochemical modifications; 3, preprocessing acquired test data; 4, selecting the type of a molecular structure descriptor of the biomaterial, performing calculation, and building a molecular structure descriptor set; 5, screening molecular descriptors on the basis of low-rank modeling; 6, building the structure-activity relationship model of modification conditions, post-screening molecular descriptors and the index of removal rate of heavy metal ions in the water (waste water) on the basis of a support vector machine, and optimizing parameters. The method has the advantages that the design and synthesis of high-performance adsorbent can be effectively guided, the development cycle of efficient adsorbent of heavy metal ions is greatly shortened, and waste of financial and material resources is avoided.

The invention relates to a prediction technology of a leakage rate of an existing contact mechanical seal. By utilizing a seal interface topography evolvement rule in the wear process of a movable ring and a stationary ring, and a contact compression stress variation rule of primary and secondary seal interfaces due to the wear-down of the movable ring and the stationary ring and the stress relaxation of an O-shaped ring, the topography parameters of the seal interfaces and loads on the movable ring and the stationary ring seal interfaces, the O-shaped ring and the internal diameter and external diameter contact interfaces of the O-shaped ring are determined after the mechanical seal runs for a certain time, and the characteristic sizes of percolation channels between the movable ring and the stationary ring seal interfaces and the O-shaped ring and the internal diameter and external diameter contact interfaces of the O-shaped ring are obtained by a percolation theory, a contact mechanics theory and a fractal theory at the moment, the effect of surface tension and centrifugal force of the sealed medium is considered, and then the leakage state of the existing contact mechanical seal is predicated by a Navier-Stokes equation. The method is simple and practical, the accident problems caused by frequent replacement or expiration of the mechanical seal can be effectively solved, and the safety and reliability of equipment are improved.