2. It introduces a short-cuts design method for designning volute springs using ratio ζ=R, /a. η =R_2/R_1 and function ψ(ζ,η), when the working loads, mounting space and its allowable stress are known;
Using energy method,we obtain the ratio of mass correction value m~* to the mass of the spring M.It turns out the m~*/M is determined by the ratio of the radii R_2/R_1 From the m~*/M～R_2/R_1 corve,it can be seen that m~*/M=1/3,when R_2/R_1=1;
由此公式可以看出,锥形弹簧质量修正值 m*与其本身质量 M 的比,完全由其两端半径的比R_2/R_1决定。 把二者的关系画成图象,可以看出:当 R_2/R_1=1时,等 m*/M=1/3;
With the spring diameter 1.5 mm and the spring length 80 mm and the interspaces are 10 mm. The pressure regulating performance of the double flow channel device is better,the test inlet-pressure is 0.049-0.32 MPa,outlet-pressure 0.045-0.144 MPa,and the flows 3.4-6.6 m~3/h.
当弹簧直径为1.5 mm,长度为80 mm,栅栏孔隙宽度为10 mm时,此时入口端实测压力为0.049~0.320 M Pa,出口端压力为0.045~0.144 M Pa,流量为3.4~6.6 m3/h。
With 870 ℃ quenched and 320 ℃ tempered the super-fine grain spring steel 38SiMnVB as a spring for cars had excellent comprehensive mechanical properties -tensile strength 2 030～ 2 140 MPa, yield strength 1 900～ 2 010 MPa, elongation 12%～15%, reduction of area 48%～55%.
Several natural associations composed of thermophilic anaerobic bacteria capable of utilizing various cellulose materials at 60 ± 2°C and pH 6.0-7.0 were isolated from the sludge of Kamchatka geothermal springs.
Nonsulfur photosynthetic purple bacteria isolated from the Dzhermuk mineral springs (Armenia) were grown on sugar-containing media and found to be capable of synthesizing L(+)-lactic acid.
Strains VK2 and VK21 isolated from thermal springs of the Kamchatka Peninsula, and antagonistic to several gram-positive bacterial species were chosen for further investigation of antibiotics produced by them.
Extracellular proteolytic enzymes of microscopic fungi from thermal springs of the Barguzin Valley (Northern Baikal region)
Production of extracellular proteolytic enzymes was studied in thermophilic fungi Paecelomyces variotii and Aspergillus carneus, isolated from thermal springs of the Barguzin Valley.
Habitat selection of the Tibetan Snow Cock Tetraogallus tibetanus in the spring in Lhasa
It is assumed that masses of the points and the rigidity of the spring are unknown and the points are subject to forces of dry friction with unknown variable coefficients.
The critical height is found at which the magnet ceases to be held by the spring and is torn off into the liquid.
One-hour shifts of the acrophase of this rhythm towards earlier hours in the spring and in the opposite direction in the autumn could be related to the practice of changing the clock to winter and summer time.
The energy losses of doubly charged copper ions (Cu2+) accelerated to 0.1 MeV/nucleon in gases were measured for first time in the spring of 2004.
A problem of control of a mechanical system is considered that represents two mass points connected by a spring and moving along parallel straight lines.
The problem of the stability of a circular cylinder in a circulation flow is considered under the condition that the cylinder can perform both free (free cylinder) and forced oscillations (cylinder on a spring).
The increment of sample mass is measured continuously using a spring balance.
These supercoiled DNA molecules, which are compressed like a spring and have a decreased rise per base pair compared to previously known DNA forms are considered to be a new form of DNA, S-DNA.
Two peaks of population density were revealed: a spring-summer peak and an autumn peak.