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Study of relationship between motion of mechanisms in gas operated weapon and its shock absorber
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作者 Jiri Balla Roman Vitek +2 位作者 Dung Nguyen Van Zbynek Krist Hung Nguyen Van 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第3期42-54,共13页
The article deals with the motion of the breech block carrier and the weapon casing of an automatic weapon mounted on a flexible carriage and the base of the weapon.Earlier works,which did not consider the dynamic pro... The article deals with the motion of the breech block carrier and the weapon casing of an automatic weapon mounted on a flexible carriage and the base of the weapon.Earlier works,which did not consider the dynamic properties of the base of the weapon,did not allow to reconcile the calculated and experimental results of the weapon casing displacement when shooting from firing rests.For the analysis of the motion of individual parts,the methods of mathematical modelling and firing experiments using a high-speed camera were chosen.Calculations show the best accord with experiment when modelling the system with 4 degrees of freedom.The oscillation of the system regarding the movement of the breech block carrier and the weapon casing was investigated under changed conditions of rate of fire,the use of a muzzle brake and different types of shock absorbers.The velocities and displacements of the weapon casing and the breech block carrier at different values of the impulse of the gases to the breech block carrier were determined. 展开更多
关键词 shock absorber Gas-operated weapon Force-impulse diagram Recoil system Breech block carrier
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DESIGN OF NEW PASSIVE ADAPTIVE SHOCK ABSORBER OF LANDING GEAR AND STUDY OF ITS LANDING PERFORMANCE
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作者 朱书华 童明波 许杰 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2009年第1期29-35,共7页
A new passive adaptive shock absorber of the landing gear with double-cavity and dual-damping is studied. Its mathematical model and the virtual prototype are established based on the dynamics simulation software ADAM... A new passive adaptive shock absorber of the landing gear with double-cavity and dual-damping is studied. Its mathematical model and the virtual prototype are established based on the dynamics simulation software ADAMS. The landing dynamic characteristics and the effect of the parameters on the proposed adaptive shock absorber are analyzed. The results show that the proposed adaptive shock absorber has the slightly better landing performance at the normal load case and much less overload at the crudely landing case than the shock absorber with single-cavity and variable orifice. It also can be concluded that the overload of the proposed adaptive shock absorber can be reduced through increasing the volumes of both cavities or decreasing the pressure of the high pressure cavity or increasing the pressure of the low pressure cavity. 展开更多
关键词 landing gear(aircraft) shock absorbers LANDING virtual prototype
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The Outer-Performance Distortion of the Suspension Shock Absorber and Its Critical Velocity
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作者 俞德孚 傅瞾 《Journal of Beijing Institute of Technology》 EI CAS 1995年第2期206+198-206,共10页
On the basis of analysing the outer performance degradation of shock absorber on suspenson and from the relationship between outer and inner performances of the shock absorber, an internal relationship between the str... On the basis of analysing the outer performance degradation of shock absorber on suspenson and from the relationship between outer and inner performances of the shock absorber, an internal relationship between the structure design and degradation of the shock absorber is discussed in the paper. From dynamic property, analysed the dynamic cause for degradation, the paper proposes a technical method of improving outer performance and a concept of critical velocity, and discusses what effects the critical velocity and the outer performance mance degradation has. 展开更多
关键词 suspended structures DAMPERS critical velocity/suspension shock absorber DEGRADATION
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Theoretical Study and Structural Design of ERF Shock Absorbers
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作者 魏宸官 傅曌 《Journal of Beijing Institute of Technology》 EI CAS 1996年第1期85-94,共10页
Electrorheologica (ER) technique is a developing technology. In a wide range of engineering applications of ER fluid, shock absorbers employing ER fluids, whose damping force can be controlled continuously and promptl... Electrorheologica (ER) technique is a developing technology. In a wide range of engineering applications of ER fluid, shock absorbers employing ER fluids, whose damping force can be controlled continuously and promptly through electric signals, is one of the most prospective applications of ER fluid. In this paper, the theoretical midel and method to predict the damping force of ERF shock absorbers are established. 展开更多
关键词 shock absorbers DAMPER electrorheological fluids (ERF)
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Fluid structure interaction for circulation valve of hydraulic shock absorber 被引量:6
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作者 陈齐平 舒红宇 +2 位作者 方文强 何联格 杨茂举 《Journal of Central South University》 SCIE EI CAS 2013年第3期648-654,共7页
Based on the working principle and the damping characteristic of hydraulic shock absorber, a fluid structure interaction method was presented, which was used to analyze the microcosmic and high-frequency processing me... Based on the working principle and the damping characteristic of hydraulic shock absorber, a fluid structure interaction method was presented, which was used to analyze the microcosmic and high-frequency processing mechanism of fluid structure interaction between circulation valve and liquid of hydraulic shock absorber. The fluid mesh distortion was controlled by the CEL language, and the fluid struc^tre interaction mathematical model was established. The finite element model was established by ANSYS CFX software and was analyzed by dynamic mesh technique. The local sensitive computational area was meshed by prismatic grid, which could reduce the negative volume problem during the simulation. The circulation valve and liquid of hydraulic shock absorber were simulated and analyzed under the condition of sinusoidal inlet velocity loads. Flow characteristic and dynamics characteristic were obtained. The pressure distribution and the displacement of circulation value were obtained, and the acceleration curve of circulation valve was simulated and analyzed. The conformity of the final simulation results with the experimental datum indicates that this method is accurate and reliable to analyze the dynamics characteristic between circulation valve and liquid of hydraulic shock absorber, which can provide a theoretical foundation for optimizing hydraulic shock absorber in the future. 展开更多
关键词 hydraulic shock absorber circulation valve finite element method fluid structure interaction simulation analysis
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Thermal Analysis of Vehicular Twin-Tube Hydraulic Gas-Precharged Shock Absorbers 被引量:5
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作者 么鸣涛 顾亮 管继富 《Journal of Beijing Institute of Technology》 EI CAS 2010年第3期286-292,共7页
In this study of temperature rising in vehicular twin-tube hydraulic gas-precharged shock absorbers,thermodynamic analyses were conducted via simulations.Equations on heat conduction,heat convection as well as radiati... In this study of temperature rising in vehicular twin-tube hydraulic gas-precharged shock absorbers,thermodynamic analyses were conducted via simulations.Equations on heat conduction,heat convection as well as radiation were derived by applying certain laws governing heat transfer;an equivalent thermal resistance network model of a shock absorber undergoing heat transfer was established innovatively;moreover,the shock absorber’s thermodynamic model of control volume system was built by using the first law of thermodynamics;and finally,time required for shock absorber to reach thermal equilibrium and corresponding value of steady temperature were calculated by programming.In this way,a lower thermal equilibrium temperature will be achieved,hence help to improve reliability of shock absorbers in work by offering low ambient temperature,by reducing amplitudes and frequencies of external incentives exerted on them and by increasing flow rate of ambient air passing around them. 展开更多
关键词 shock absorber thermal resistance network model thermodynamic model thermal equilibrium
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CAD/CAE OF THE WORKING CHARACTERISTICS OF A NEW TYPE OF FLUID COUPLING SHOCK ABSORBER 被引量:4
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作者 Yang Ping Zhong Yifang Zhou JiSchool of Mechanical Science and Engineering, Huazhong University of Science and Technology,Wuhan 430074, ChinaLiu Yong Guilin Institute of Electronic Technology 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2002年第3期222-227,共6页
For purpose of simulation of the working characteristics of a new type offluid coupling shock absorber for vibration protection of sensitive equipment, a physical model ispresented by analyzing the internal fluid dyna... For purpose of simulation of the working characteristics of a new type offluid coupling shock absorber for vibration protection of sensitive equipment, a physical model ispresented by analyzing the internal fluid dynamic phenomenon with respect to the coupling shockabsorber and implemented in MATLAB software package. Using the model it is possible to evaluate theimportance of different factors for design of the shock absorber. In the meantime, the key-modelmachine is designed for coupling dynamic test. Comparisons with experimental results confirm thevalidity of the model. So the CAD/CAE software has been developed in MATLAB for design andexperimental test of the new coupling shock absorber. 展开更多
关键词 Fluid coupling shock absorber Working characteristics MODEL SIMULATION
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Theoretical analysis and experimental investigation of a high-performance viscoelastic material shock absorber 被引量:4
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作者 TONG Zhi-hui SU Tie-xiong LIU Han-tao 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第3期213-218,共6页
To improve the performance of traditional mechanical shock absorber, a new type of high molecular polymer is formulated and applied to overloaded vehicle shock absorber. According to the operating principle of high-pe... To improve the performance of traditional mechanical shock absorber, a new type of high molecular polymer is formulated and applied to overloaded vehicle shock absorber. According to the operating principle of high-performance viscoelastic material shock absorber, the geometrical structure of shock absorber is designed and machined. Then its theoretical model is derived by using analytical method, and the impact test is carried out on high-performance viscoelastic material shock absorber. The results show that experimental and theoretical damping force curves have good agreement, which validates the credibility of theoretical model. The investigation provides a potential way to enhance damping performance and increase vehicle load. 展开更多
关键词 viscoelastic material shock absorber damping force impact test
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Effect of Porosity on the Mechanical Properties and Wear Performance of 2% Copper Reinforced Sintered Steel Used in Shock Absorber Piston Production 被引量:2
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作者 Bekir Yalin 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2009年第5期577-582,共6页
Powder metallurgy (P/M) method has mainly been used to produce automobile parts such as self-lubrication beds, shock absorber parts, and gear wheels. In order to investigate the effect of porosity on the mechanical ... Powder metallurgy (P/M) method has mainly been used to produce automobile parts such as self-lubrication beds, shock absorber parts, and gear wheels. In order to investigate the effect of porosity on the mechanical and tribological properties in sintered steel, specimens with 10%, 15%, and 20% porosity were produced in a 10 mm×10 mm×55 mm prismatic shape by pre-alloying powders of the MPIF Fe-C-0.205 alloy used in the production of shock absorber pistons. Sintering was carried out at 900℃ for 45 min in an argon atmosphere. Tensile, charpy, and microhardness tests were performed on these specimens. In addition, the wear performance of a 2% Cu reinforced sintered steel alloy under dry sliding conditions was determined. Metallographic studies such as pore formation, worn surface, and fractured surface analyses were performed by scanning electron microscopy and optical microscopy. The results indicate that irregular pore formation tendencies increase with an increase in porosity (%). Furthermore, an increase in porosity was shown to decrease the mechanical properties and increase the wear trace area and the friction coefficient of sintered steel. 展开更多
关键词 shock absorber piston Powder metallurgy POROSITY Friction coefficient
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DESIGN METHOD OF MAGNETORHEOLOGICAL FLUID SHOCK ABSORBER FOR CAR SUSPENSION 被引量:5
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作者 LIAO Changrong ZHANG Honghui +1 位作者 YU Miao CHEN Weimin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第5期19-22,共4页
The Bingham constitutive model, which is previously used in depiction of magnetorheological (MR) fluids rheological behaviors for design devices, exhibits discontinuous characteristics in representation of pre-yield... The Bingham constitutive model, which is previously used in depiction of magnetorheological (MR) fluids rheological behaviors for design devices, exhibits discontinuous characteristics in representation of pre-yield behaviors and post-yield behaviors. A Biviscous constitutive model is presented to depict rheological behaviors of MR fluids and design automotive shock absorber. Quasi-static flow equations of MR fluids in annular channels are set theoretically up based on Navier-Stokes equations and several rational simplifications are made. And both flow boundary conditions and flow compatibilities conditions are established. Meantime, analytical velocity profiles of MR fluids though annular channels are obtained via solution of the quasi-static flow equations using Biviscous constitutive model. The prediction methodology of damping force offered by MR fluid shock absorber is formulated and damping performances are predicated in order to determine design parameters. MR fluid shock absorber for Mazda 323 car suspension is designed and fabricated in Chongqing University, China. Measurements from sinusoidal displacement cycle by Shanchuan Shock Absorber Ltd. of China North Industry Corporation reveal that the analytical methodology and design theory are reasonable. 展开更多
关键词 Magnetorheological fluid shock absorber Biviscous constitutive model Bingham constitutive model
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The Outer Performance Degradation of Shock Absorber and Its Effect on Ride Comfort and Driving Safety
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作者 傅曌 俞德孚 《Journal of Beijing Institute of Technology》 EI CAS 1992年第2期179-190,共12页
Based on the well-known quarter car representation of the automobile suspension,this paper deals with the effect of shock absorber outer performance degradation(OPD)on vehicle ride comfort and driving safety.Based on ... Based on the well-known quarter car representation of the automobile suspension,this paper deals with the effect of shock absorber outer performance degradation(OPD)on vehicle ride comfort and driving safety.Based on an elastici- ty model of a flat circular plate having a central hole,a program for the determina- tion of shock absorber outer performance(SOP)has been developed. Based on a hy- drodynamic theory,principles for the inter performance design of shock absorbers are presented to ensure expected SOP and the concept of critical velocity for the pre- vention of OPD is studied.By analysing the mechanism of degradation,a method for the elimination of shock absorber degradation is offered for practical structural design,i.e,the structural design of dual-tube gas charge shock absorbers.A good deal of experimental data,are presented to prove the theoreticaly studies. 展开更多
关键词 SUSPENSIONS dampers/shock absorber DEGRADATION RIDE SAFETY
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Micro-process model of hydraulic shock absorber with abnormal structural noise 被引量:1
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作者 舒红宇 张伟伟 冯彧 《Journal of Central South University of Technology》 EI 2008年第6期853-859,共7页
In order to discover the causes of the abnormal noise of shock absorbers, it is necessary to identify the operating characteristics of the shock absorbers. A micro-process model for operation of the hydraulic shock ab... In order to discover the causes of the abnormal noise of shock absorbers, it is necessary to identify the operating characteristics of the shock absorbers. A micro-process model for operation of the hydraulic shock absorber was presented. A novel concept, which describes the process of hydraulic shock absorber by dividing it into smaller steps, was proposed. The dynamic model and the differential equations were established. The results of numerical simulation agree well with data obtained from the vibrostand test, indicating that the collision between the piston and the oil, the alternation of static friction and sliding friction acted between the piston and the cylinder, and the adherence between valve plate and piston result in impact on the piston head near the top dead center and the bottom dead center. Ultimately, the impact excites the high-frequency vibration of the piston structure, which can generate the abnormal noise in the hydraulic shock absorber after its transfer. And the maximum vibration acceleration on the piston head and the abnormal noise increase with the increase of the gap between the oil and piston rod head, the maximum static friction force and the adhering function, respectively. 展开更多
关键词 shock absorber abnormal noise micro-process clearance impact simulation
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Research on Simulation and Test of the Nonlinear Responses for the Hydraulic Shock Absorber 被引量:1
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作者 张建武 刘延庆 《Journal of Donghua University(English Edition)》 EI CAS 2003年第4期98-102,共5页
Basically on the multi-body system dynamics,the virtual prototype of the hydraulic shock absorber for the bench test is developed in the ADAMS environment.Dynamic behaviors of the absorber are studied by both computer... Basically on the multi-body system dynamics,the virtual prototype of the hydraulic shock absorber for the bench test is developed in the ADAMS environment.Dynamic behaviors of the absorber are studied by both computer simulation and real test.Numerical predictions of dynamic responses are produced by the established virtual prototype of the absorber and compared with experimental results.It has been shown from the comparison that the vibration behaviors of the prototype with hysteretic damping characteristics are considered to be more identical with the bench test results than those of the same prototype with piecewise linear damping properties are.The current virtual prototype of the shock absorber is correct and can be a developing terrace for the optimizing design of the absorber and matching capability of the whole car. 展开更多
关键词 shock absorber hysterctic damping Multi-body dynamics
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APPLICATION OF MODERN ROBUST OPTIMAL DESIGN METHOD TO THE SHOCK ABSORBER IN A CAR*
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作者 ZhangRuihong ChenYing 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第1期37-39,共3页
To reduce the variation of velocity characteristic of the shock absorber in acar, a modern robust optimal design method is applied to its structural parameters design. Firstly,the method is used to obtain the robust v... To reduce the variation of velocity characteristic of the shock absorber in acar, a modern robust optimal design method is applied to its structural parameters design. Firstly,the method is used to obtain the robust values which have low sensitivity to velocitycharacteristic and analyze the influences of the parameters on velocity characteristic. Secondly,the method is used to obtain their maximum tolerances under the condition of ensuring productquality. The results obviously improve the velocity characteristic. 展开更多
关键词 Velocity characteristic shock absorber Modern robust optimal design Parameters design
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Water Hammer Model of Shock Absorber Throttle Slice
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作者 陈轶杰 顾亮 +1 位作者 雷绳光 管继富 《Journal of Beijing Institute of Technology》 EI CAS 2008年第1期14-19,共6页
In allusion to easy invalidation of damping valve in vehicle shock absorber caused by the impact from the road surface, the importance of the study of damping valve water hammer pressure is presented. The physical mod... In allusion to easy invalidation of damping valve in vehicle shock absorber caused by the impact from the road surface, the importance of the study of damping valve water hammer pressure is presented. The physical model of damping valve with the circle throttle slice is established. The time for the throttle slice deformation is studied by using the finite software, and the laws that how the structure parameters affect the deformation time are obtained. Combining the theory of water hammer, the water hammer initial and boundary condition of the damping valve is deduced, and the water hammer model of throttle slice is established. The analysis of simulation results indicates that the water hammer pressure amplitude and the amount of water hammer oscillation period can be reduced and the dependability of the valve can be enhanced by modifying the structure parameters and aperture width between slice and valve body. 展开更多
关键词 shock absorber throttle slice DEFORMATION water hammer model
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Vibration energy regeneration of electric vehicle shock absorber
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作者 张军 梁新成 唐建华 《Journal of Beijing Institute of Technology》 EI CAS 2013年第3期337-341,共5页
The twin-tube shock absorber was studied and the relevant factors of thermal equilibrium were simulated. The dynamic model of the shock absorber was constructed and simulation curves of force-displacement and force-ve... The twin-tube shock absorber was studied and the relevant factors of thermal equilibrium were simulated. The dynamic model of the shock absorber was constructed and simulation curves of force-displacement and force-velocity were output. The experiment of the twin-tube shock absorber was carried out, and the results were compared with the modeling resultss. Further, the vibration energy regeneration model was established, and the bench simulation study was carried out. The re- sults showed that the energy regeneration model not only absorbed shock energy but also converted vibration energy into electricity energy. 展开更多
关键词 electric vehicle (EV) vibration energy regeneration shock absorber SIMULATION
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Processing the rig test data of an air filling twin-tube shock absorber
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作者 董明明 骆振兴 赵永飞 《Journal of Beijing Institute of Technology》 EI CAS 2015年第2期201-206,共6页
A separation method is proposed to design and improve shock absorber according to the characteristics of each force. The method is validated by rig test. The force data measured during rig test is the resultant force ... A separation method is proposed to design and improve shock absorber according to the characteristics of each force. The method is validated by rig test. The force data measured during rig test is the resultant force of damping force, rebound force produced by pressed air, and friction force. Different characters of damping force, air rebound force and friction force can be applied to seperate each force from others. A massive produced air filling shock absorber is adopted for the validation. The statistic test is used to get the displacement-force curves. The data are used as the input of separation calculation. Then the tests are carried out again to obtain the force data without air rebound force. The force without air rebound is compared to the data derived from the former tests with the separation method. The result shows that this method can separate the damping force and the air elastic force. 展开更多
关键词 air filling shock absorber force-stroke curve rig test data forces separation
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Basic Problems in Design and Inverse Engineering Solution for Outer Characteristic of Vehicle Suspension Shock Absorbers
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作者 俞德孚 陈庆东 李文君 《Journal of Beijing Institute of Technology》 EI CAS 2003年第2期166-171,共6页
Based on the theory and the practical experiences of linearity design of feasible design area and inverse solution of non linear outer characteristic of suspension shock absorber, in accordance with non linearity ou... Based on the theory and the practical experiences of linearity design of feasible design area and inverse solution of non linear outer characteristic of suspension shock absorber, in accordance with non linearity outer characteristic formed by open up damping coefficient, full open damping coefficient and smoothness to safety ratio of suspension shock absorber, a method and a research conclusion of the feasible design and inverse solution for the basic problems of designing and inverse solution of non linear outer characteristic of suspension damping components are provided. 展开更多
关键词 vehicle suspension outer characteristic of shock absorber designing and inverse engineering
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Parametric design of an electrorheological shock absorber with the mixed-mode
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作者 郑玲 《Journal of Chongqing University》 CAS 2003年第2期16-19,共4页
A mathematical model based on an electrorheological (ER) shock absorber with the mixed-mode is presented. Its application to the parametric design of an electrorheological fluid shock absorber with the simulation calc... A mathematical model based on an electrorheological (ER) shock absorber with the mixed-mode is presented. Its application to the parametric design of an electrorheological fluid shock absorber with the simulation calculation performed by program MATLAB demonstrates that the model can predict the behavior of ER shock absorbers satisfactorily, shorten the design period of an electrorheological shock absorber, and reduce the cost in the prototype manufacturing. The strength analysis based on a three-dimensional finite element model for the electrorheological shock absorber confirm that the structure design of the ER shock absorber is reasonable, and the stress distribution is uniform. 展开更多
关键词 semi- active suspension ER shock absorber DESIGN
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Empirical modeling of nonlinear and hysteresis characteristics of the shock absorber
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作者 崔岩 Sun Fengchun 《High Technology Letters》 EI CAS 2013年第3期267-272,共6页
An empirical hybrid shock absorber model capable of capturing nonlinear and hysteresis characteristics of shock absorbers is built.The nonlinear characteristics are modeled by algebraic function and the hysteresis eff... An empirical hybrid shock absorber model capable of capturing nonlinear and hysteresis characteristics of shock absorbers is built.The nonlinear characteristics are modeled by algebraic function and the hysteresis effects between shock force and shock velocity are modeled by neural network.To develop the empirical hybrid shock absorber model,a Mazda CX-7 front shock absorber is tested by a displacement-controlled hydraulic shock absorber testing machine.The hybrid shock absorber model is built and validated using the experimental shock absorber data.The RMS value for the hybrid shock absorber model is 60.28N at the velocity range from-1.3m/s to 1.3m/s. 展开更多
关键词 shock absorber NONLINEARITY HYSTERESIS vehicle dynamics
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