In the text we analyse the changes of the momenta and the energy on each stage in the impact process, take into account the effect of the mass of impact object and the system of the closed cylindrical shell by impact, and transform the distributed mass of the whole cylindrical shell into an only concentrated "equivalent mass by the method of reduced mass. Consequently we derive the dynamic factor of the closed cylindrical shell due to impact load.

The ratios of the impulse transformed to and the energy absorbed by the frame in the initial collision to that carried by the moving body before impact is only related to the ratio between the 'equivalent mass' of the frame paticipating in the initial collision and the mass of the impacting body, having nothing to do with the impacting velocity to a certain extent.

In this paper the author presents two simplified methods of calculating natural frequency for multi-degree-of-freedom systems, one of which is equivalent stiffness and equivalent mass method, the other of which is dynamic displacement method. Both of the methods could be applied to structural design.

In this paper the author presents two simplified methods of calculating natural frequency for multi-degree-of-freedom systems, one of which is equivalent stiffness a n d equivalent mass method, the other of which is dynamic displacement method. Both of the methods could be applied to structural design.

The numerical calculations show that a metal hydride pump system with comparable size as water sublimator and less mass loss can satisfy the cooling requirement of the astronaut during EVA process,and the temperature can be regulated by controlling the pressure of the hydride bed.

It is the core and essential assurance to enhance company’s competition that strengthend process control and optimize cost structure, espe- cially decrease trouble cost ,and it is also developing tendency.

Calculation samples and error analysis show that the new procedure can turn out reliable calculation results with the calculation accuracy meeting the general engineering requirements,indicating that the method is applicable for calculation of natural frequency and vibration period of multistory frame systems.

The high resolution capability of the first two analysers enables separation of parent ions with similar nominal mass but different elemental composition.

Improved magnet technology offers high speed quadrupole style survey scans covering the full elemental mass range at nominal mass resolution.

This is caused by CP congeners with the same nominal mass, but with five carbon atoms more and two chlorine atoms less; for example C11H1737Cl35Cl6

When the nominal mass ratio of TEOS/PDMS was less than 1.5, the ORMOSILS began to show the rubber-like elasticity.

Moreover, the grade 3 and class 3 reference weights can be tested against the weights incorporated in the balance by taking their nominal mass values.

Spectrographic detection resulted in background equivalent mass values below 10 ng for 22 from 36 elements applied in solution (Ar + CCl4 atmosphere and NaCl matrix).

Supersonic microjet nozzles thus provide a more effective small-scale high-pressure gas delivery device than do sonic nozzles of comparable scale at equivalent mass flow rates.

One subject was loaded during bipedal gaits with a bicycle-equivalent mass, to simulate to cross-country cycling situation.

Maximum mechanical energy release is by far greatest for gas eruptions (≤～1.3 MJ/kg of fluid-rock mixture)-about one-half that of an equivalent mass of gunpowder and one-fourth that of TNT.

The objective of the suspension design is to decrease the equivalent mass with increasing first torsional frequency.

This paper gives a theoretical analysis about the hit energy, flight time, delay time etc. of the electromagnetic parts of a line printer. The methods for measuring flight time and delay time under laboratory conditions are described and a comparison between measured and calculated values is made.The conception of equivalent mass is introduced in the calculation of flight time and its physical meaning and mathematical implication are explained.

The present paper treated some of the problems for dynamic computation of closed cylindrical shell due to an axial impact load, including the calculations of the dynamic stresses and the problems of stability. It analysed the changes of the momentums and the energy in the impact process, took into account the effect of the mass of the striking object and the system of the closed cylindrical shell to be struck, turned the distributed mass of the total cylindrical shell into an "equivalent mass" being concentrated...

The present paper treated some of the problems for dynamic computation of closed cylindrical shell due to an axial impact load, including the calculations of the dynamic stresses and the problems of stability. It analysed the changes of the momentums and the energy in the impact process, took into account the effect of the mass of the striking object and the system of the closed cylindrical shell to be struck, turned the distributed mass of the total cylindrical shell into an "equivalent mass" being concentrated on only at one end of the shell by using the way of reduced mass, and accordingly derived the dynamic factor of the closed cylindrical shell under the axial impact load, hence resolved the questions of calculation of the dynamic stresses in the loaded case mentioned above and found out the critical loading.

This article discusses the dynamic computation of the closed cylindrical shell under impact load. In the text we analyse the changes of the momenta and the energy on each stage in the impact process, take into account the effect of the mass of impact object and the system of the closed cylindrical shell by impact, and transform the distributed mass of the whole cylindrical shell into an only concentrated "equivalent mass by the method of reduced mass. Consequently we derive the dynamic factor of the closed cylindrical...

This article discusses the dynamic computation of the closed cylindrical shell under impact load. In the text we analyse the changes of the momenta and the energy on each stage in the impact process, take into account the effect of the mass of impact object and the system of the closed cylindrical shell by impact, and transform the distributed mass of the whole cylindrical shell into an only concentrated "equivalent mass by the method of reduced mass. Consequently we derive the dynamic factor of the closed cylindrical shell due to impact load.