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18 February 2017, Volume 37 Issue 1 Previous Issue    Next Issue

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Nonlinear Random Response Characteristics of Viscoelastic Sandwich Beams under Gaussian Excitations 2017, 37(1): 1-4.  DOI: 10.3969/j.issn.1006-1335.2017.01.001 Abstract ( )   PDF (1188KB) ( )   The random vibration control of viscoelastic sandwich beams is an important realistic subject. The sandwich beams with properties-controllable viscoelastic core can be optimized without structural change and then are concerned. The vibration responses of the controllable viscoelastic sandwich beams have been studied. However, the viscoelastic material dynamics in these studies were described by linear models. The viscoelastic nonlinearity, in particular, physical nonlinearity needs to be considered for strong vibrations. In this paper, a nonlinear dynamic model is used for describing the viscoelastic constitutive relation. The differential equations of motion of a viscoelastic sandwich beam with supported mass under stationary random support excitations are derived and converted into nonlinear multi-mode coupling vibration equations by using the Galerkin method. The equivalent quasi-linear system is derived by using the statistic linearization method. The random responses such as MS displacement as well as the equivalent frequency response function and power spectral density of the nonlinear random vibration are obtained, which are used for evaluating the vibration suppression effectiveness of the viscoelastic sandwich beam. Related Articles | Metrics

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Calculation and Image Analysis of Belt Transverse Vibration in Serpentine Belt Drive Systems 2017, 37(1): 5-9.  DOI: 10.3969/j.issn.1006-1335.2017.01.002 Abstract ( )   PDF (1322KB) ( )   Related Articles | Metrics

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Numerical Calculation and Analysis of Exhaust Noise of     Turbocharged Engines ZhenlinJI 2017, 37(1): 10-15.  DOI: 10.3969/j.issn.1006-1335.2017.01.003 Abstract ( )   PDF (1678KB) ( )   Engine and exhaust system was coupled and calculated to optimize the muffler design. Muffler acoustic performance and turbo engine exhaust noise was calculated by GT-Power software, and simulation results were compared with experimental data to verify the correctness of the simulation model. The structure of exhaust muffler was optimized based on the present study, and the optimization scheme could meet the noise limit. The changing rule of the exhaust noise of the car coupled with engine was analyzed，the car was accelerated in hundreds of kilometers of the transient process The results show that, higher exhaust noise pressure level is simulated because of automobile speed and the exhaust flow mutation. Related Articles | Metrics

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Multi-symplectic Algorithm for Vibration Analysis of the Rods with Linear Damping 2017, 37(1): 16-19.  DOI: 10.3969/j.issn.1006-1335.2017.01.004 Abstract ( )   PDF (1167KB) ( )   Related Articles | Metrics

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Aeroelastic Model Design and Dynamic Characteristics Analysis of Typical Transmission Towers 2017, 37(1): 20-25.  DOI: 10.3969/j.issn.1006-1335.2017.01.005 Abstract ( )   PDF (1781KB) ( )   Related Articles | Metrics

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Finite Element Analysis and Optimization Design for Air Conditioner Pipeline Systems 2017, 37(1): 26-29.  DOI: 10.3969/j.issn.1006-1335.2017.01.006 Abstract ( )   PDF (1151KB) ( )   Aiming at vibration problem on air-conditioner pipeline，HyperMesh is applied to divide the designed air-conditioner pipeline model into high quality hexahedral mesh. Then, the model is imported into ANSYS to carry out modal analysis, and the natural frequencies and modes of the first 10 orders are calculated. It is found that the first order natural frequency is near the operating frequency, the vibration mode of the natural frequency is analyzed and the design scheme is put forward to improve the pipeline system, which makes the natural frequency of the air conditioning pipeline system far away from the operating frequency and avoid the resonance. Finally, the experiment is carried out with the improved structure，and it is found that the amplitude of the vibration of improved structure has been reduced by 90%. Practice shows that the application of ANSYS and other finite element technology efficiently improves the efficiency and accuracy in the process of vibration reduction of air conditioner. Related Articles | Metrics

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Analysis of Primary Resonance of Nonlinear Vibration of Solenoid Switch Systems under Narrow-band Excitation 2017, 37(1): 30-34.  DOI: 10.3969/j.issn.1006-1335.2017.01.007 Abstract ( )   PDF (1489KB) ( )   Taking solenoid switch system as the study object, the electric circuit and magnetic circuit coupled system of the strong nonlinear vibration problem under narrow-band excitation is investigated. The stochastic differential equation of the solenoid switch system subjected to narrow-band excitation is established. The frequency response equation of the system is obtained based on the method of modified multiple scales method, The stability of the primary resonance of the system under narrow band excitation is calculated, and the influence of the parameters of the system on the mean square value of the system is analyzed. The results show that the mean square value of the primary resonance of the system reduces with increasing of the damping coefficient; The mean square value of the primary resonance of the system increases with increasing of the excitation voltage amplitude; The mean square value of the primary resonance of the system reduces with increasing of the resistance; The change of limit cycle of the system is small with increasing of the intensity of the random disturbance. Related Articles | Metrics

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Numerical Prediction and Control Method of Aerodynamic Noise from a Non-compact Circular Cylinder with Impedance Boundaries 2017, 37(1): 35-39.  DOI: 10.3969/j.issn.1006-1335.2017.01.008 Abstract ( )   PDF (1527KB) ( )   Related Articles | Metrics

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Application of Complex Modal Analysis in Disc Braking Noise Suppression 2017, 37(1): 40-43.  DOI: 10.3969/j.issn.1006-1335.2017.01.009 Abstract ( )   PDF (1482KB) ( )   Abstract: In order to control the disc brake noise of a particular SUV while driving, with the industry leading complex modal analysis, this paper presents the distribution of complex Eigen values using ABAQUS, and reveals that the system modal instability is due to mode superposition of the modal coupling of substructures through comparative analysis of the modal shape of substructure under unstable modal and its own modal shape. Combined with SAE J2521 test results and road test, it is discovered that simulation analysis can accurately forecast the tendency of brake noise, and whether the damping ratio is greater than 0.01 is not the sole criterion for the system’s stability. Drawing on the practical engineering experience, a structure called “asymmetric chamfer” is put forward to optimize the shape of friction plate, and this structure can effectively suppress brake noise to solve the practical engineering problem according to the test results, and offers another solution for brake noise suppression. Related Articles | Metrics

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Hydraulic System Design and Pulse Suppression of Hydraulic Drive Fracturing Pumps 2017, 37(1): 44-48.  DOI: 10.3969/j.issn.1006-1335.2017.01.010 Abstract ( )   PDF (1437KB) ( )   Aimed at the disadvantages of traditional fracturing pumps, such as high frequency of stroke, the short lifetime of easy wear parts, and so on, the hydraulic driven fracturing pump was proposed. And the half-open and half-closed circuit hydraulic system was designed. The simulation model and test prototype were built. The results showed that the model was accurate. And the high pressure also can be achieved by the hydraulic driven fracturing pump. Because of the leakage of hydraulic cylinders, Westphal Phenomena and the natural switch time of system, pressure and flow pulsation were existed, and increased with the increase of load pressure. According to the characteristics of pressure and flow pulsation, the pulse suppression device was designed, which was consisted of the piston cylinder, pneumatic cylinder and accumulator group. The results showed that the pulsation was significantly suppressed by this device, and decreased with the increase of the volume or pre-charge pressure of accumulator. With the help of this device, the pulsation of hydraulic driven fracturing pump with three-cylinder equal to the traditional fracturing pump with five-cylinder. Related Articles | Metrics

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Mechanism Analysis and Modeling of Rain-wind Induced Vibration for Bundled Conductors 2017, 37(1): 49-52.  DOI: 10.3969/j.issn.1006-1335.2017.01-11 Abstract ( )   PDF (1198KB) ( )   Related Articles | Metrics

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The International Challenge in Noise Limit Values for Domestic Buses and Coaches 2017, 37(1): 53-57.  DOI: 10.3969/j.issn.1006-1335.2017.01.012 Abstract ( )   PDF (1098KB) ( )   Related Articles | Metrics

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MRD Modeling and Its Application in Seat Cushioning 2017, 37(1): 58-62.  DOI: 10.3969/j.issn.1006-1335.2017.01.013 Abstract ( )   PDF (1460KB) ( )   Related Articles | Metrics

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Vibration Analysis and Optimal Design of the Macpherson Front Suspensions Based on Adams/Insight 2017, 37(1): 63-67.  DOI: 10.3969/j.issn.1006-1335.2017.01.014 Abstract ( )   PDF (1545KB) ( )   Related Articles | Metrics

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Study on the Solution of Braking Moan Noise Induced by    Brake Shoes Taper Wear 2017, 37(1): 68-71.  DOI: 10.3969/j.issn.1006-1335.2017.01.015 Abstract ( )   PDF (1143KB) ( )   Related Articles | Metrics

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Study on Vibration Reduction of the Tank Engines based on MRE 2017, 37(1): 72-75.  DOI: 10.3969/j.issn.1006-1335.2017.01.016 Abstract ( )   PDF (1395KB) ( )   Related Articles | Metrics

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An Alternative Design and Performance Experiments of an Energy-regenerative Electromagnetic Actuator 2017, 37(1): 76-81.  DOI: 10.3969/j.issn.1006-1335.2017.01.017 Abstract ( )   PDF (1435KB) ( )   To solve the problem of the tremendous amount of energy consuming in active suspension system, an energy-regenerative electromagnetic suspension system was designed, which could recover the vibration energy dissipated by the absorber in active suspension system, and could lower the energy consume and improve the efficiency of energy utilization. A design scheme of energy-regenerative electromagnetic actuator was provided with fully consideration of the feature of structures and functions of the energy-regenerative electromagnetic suspension system. The design requirements of actuator falls into 3 categories: basic requirement, function implementation requirement, and optimization design requirement. A principle prototype of the energy-regenerative electromagnetic actuator was designed and processed, and experimentations on the performance of the actuator were conducted. The experimentation on following characteristic was aiming to test the frictional resistance of the actuator, and the experimentation on static mechanical characteristic was aiming to acquire the magnitude of the force that the actuator provided, and the experimentation on no-load voltage characteristic was aiming to verify the ability of energy harvesting of the actuator. The experimentation results show that the energy-regenerative electromagnetic actuator designed could fulfill the performance requirement, and it could be used to construct the energy-regenerative electromagnetic suspension system. Related Articles | Metrics

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Method for Extracting Significant Polygons of Railway Wheels 2017, 37(1): 82-85.  DOI: 10.3969/j.issn.1006-1335.2017.01.018 Abstract ( )   PDF (1616KB) ( )   Related Articles | Metrics

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Measurement and Analysis of the Influence of QY-2 Damper Fastener on Train Running Stability 2017, 37(1): 86-88.  DOI: 10.3969/j.issn.1006-1335.2017.01.019 Abstract ( )   PDF (1172KB) ( )   When the high elastic rail fastening install under rail, the track flexibility will be increased. The vibration of rail will be reduced, and the vehicle running behavior will be affected. In order to investigate the influence of QY-2 type fastener on vehicle ride quality, the vehicle’s vibration were tested for QY-2 rail fastening track and ZX-2 rail fastening track in Nanjing subway airport line when the train was traveling through. The influence of rail fastening on vehicle ride quality was analyzed. The results show that QY-2 type fastener can effectively ensure the smooth running of the vehicle, the vertical and lateral ride index are first-class. Related Articles | Metrics

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The Finite Element Method for Isolator Design and Test Verification of a Thin Shell Structure of Space Products 2017, 37(1): 89-92.  DOI: 10.3969/j.issn.1006-1335.2017.01.020 Abstract ( )   PDF (1248KB) ( )   In order to improve the ability of anti-vibration environment of space products, it is necessary to do the vibration reduction design. In this paper, an isolator design method was studied by using computer simulation and experiment methods. The isolator form was given according to the basic structure features and damping requirement of a thin shell space product, the initial parameters of the isolator were determined according to the basic theoretical calculation, the finite element model of the product and the isolator were established, the simulation method was used to optimize the structure size of the isolator, the method of vibration test was used to verify the design. The test results show that the isolator can achieve three directions of vibration reduction, the target was reached, and the method of computer simulation and experiment verification was effective. Related Articles | Metrics

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Study on Prediction Algorithm of the Flyover Noise Level of the C919 Aircraft on Cutback Thrust 2017, 37(1): 93-97.  DOI: 10.3969/j.issn.1006-1335.2017.01.021 Abstract ( )   PDF (1018KB) ( )   Related Articles | Metrics

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Influence of Homogenization of Foundation Impedance on Underwater Acoustic Radiation of a Stiffened Cylindrical Hull 2017, 37(1): 98-102.  DOI: 10.3969/j.issn.1006-1335.2017.01.022 Abstract ( )   PDF (1594KB) ( )   Related Articles | Metrics

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Shock Resistance Ability Analysis of the Tri-dimensional Pipe Hangers in Naval Ships 2017, 37(1): 103-107.  DOI: 10.3969/j.issn.1006-1335.2017.01.023 Abstract ( )   PDF (1492KB) ( )   Related Articles | Metrics

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Optimal Design of the Shielding Stiffness of a Tunnel Boring Machine for Excavation Efficiency Improvement 2017, 37(1): 108-112.  DOI: 10.3969/j.issn.1006-1335.2017.01.024 Abstract ( )   PDF (1497KB) ( )   Related Articles | Metrics

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Noise Reduction Study and Experimental Verification for the Cooling System of a Construction Machine 2017, 37(1): 113-116.  DOI: 10.3969/j.issn.1006-1335.2017.01.025 Abstract ( )   PDF (1717KB) ( )   In order to reduce the noise of the construction machine, the main noise sources are identified by using the digital signal processing method and CFD simulation models. The aerodynamic noise generated by the machine cooling system is much reduced with design optimization for the shroud. The validation testing results show that the sound power level of the machine and the sound pressure level at the operator positions are reduced nearly 4.0 dB(A) and 2.0 dB(A) separately. Related Articles | Metrics

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Research of New Track-slab Hybrid System for Low Frequency Vibration Control 2017, 37(1): 117-122.  DOI: 10.3969/j.issn.1006-1335.2017.01.026 Abstract ( )   PDF (1830KB) ( )   Taking the phenomenon of vibration attenuation in low frequency domain of the combined track system, based on passive dynamic vibration absorber theory, the tuned slab dampers were designed. According to the vehicle - track coupling dynamics, a finite element model was established. Track frequency response functions have been compared between a standard slab track and the track with optimized tuned slab damper. The results show that the slab vibration of normal track is lower than combined track due to its rigid connection between track structure and ground-base, but it also caused the base vibration of normal track is higher than combined track; In 20 ~ 40Hz, an effective measure to reduce slab low frequency vibration by tuned slab dampers on a metro track, more reduction with higher mass ratio, and the insertion loss is up to 15dB when mass ratio is 0.3. Related Articles | Metrics

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Verification of Sound Insulation Performance of Typical Building External Windows 2017, 37(1): 123-127.  DOI: 10.3969/j.issn.1006-1335.2017.01.027 Abstract ( )   PDF (1218KB) ( )   Traffic noise level and noise spectrum characteristics are obtained by conducting monitoring and analyzing the traffic noise by seven typical traffic lines in Tianjin in this paper. Seven kinds of typical building external windows are selected and field test of their sound insulation performance are carried on. the comparative analysis of the real sound insulation effect of different window types is made according to the relevant specifications. The sound insulation performance of the existing window type of Tianjin is analyzed, and the suggestion of improving the sound insulation performance of the window is given. The results can be used to evaluate the traffic noise environment along the road and railway and improve the accuracy of the environmental impact assessment which used to be based on the sound transmission loss provided by window manufacturer. Related Articles | Metrics

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Influence of the Measure Feature Phase Selection on  Operational Modal Identification of Aircrafts 2017, 37(1): 128-131.  DOI: 10.3969/j.issn.1006-1335.2017.01.028 Abstract ( )   PDF (1247KB) ( )   Related Articles | Metrics

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Theoretical Analysis and Experimental Study on Non-effective Damage Locations of Cracked Beams 2017, 37(1): 132-136.  DOI: 10.3969/j.issn.1006-1335.2017.01.029 Abstract ( )   PDF (1716KB) ( )   Related Articles | Metrics

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An Adaptive Method for Fault Diagnosis of Bearings based on Adjusting Filter Parameters 2017, 37(1): 137-141.  DOI: 10.3969/j.issn.1006-1335.2017.01.030 Abstract ( )   PDF (1406KB) ( )   Related Articles | Metrics

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Analysis of an Online Evaluation System of Motor Noises based on BP Neural Network 2017, 37(1): 142-148.  DOI: 10.3969/j.issn.1006-1335.2017.01.031 Abstract ( )   PDF (1386KB) ( )   Related Articles | Metrics

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The Fault Diagnosis Method of Rolling Bearings based on     Sound Signal Skewness 2017, 37(1): 149-151.  DOI: 10.3969/j.issn.1006-1335.2017.01.032 Abstract ( )   PDF (1133KB) ( )   Related Articles | Metrics

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Experimental Study on a New Dynamic Vibration Absorber with Adjustable Frequency for Vibration Reduction of Hydraulic Pipelines CHEN GUO CHEN 2017, 37(1): 152-157.  DOI: 10.3969/j.issn.1006-1335.2017.01.033 Abstract ( )   PDF (2348KB) ( )   In this paper, the experiment which is to reduce the vibration of the real hydraulic pipeline is carried on, with a kind of new dynamic vibration absorber according to the paper 8. This dynamic vibration absorber which is mainly composed of mass and spring leaf is designed to reduce the vibration of the pipeline system which is difficult to install the clamp, and it could also reduce the vibration of the pipelines under different frequencies by adjusting the position of the mass on the spring leaf. Aiming at the severe vibration problem of a suspended pipeline on the hydraulic power source, two dynamic vibration absorbers are designed, and put on the pipeline system under different frequencies to carry on the reducing vibration experiments, and the results shows that the pressure fluctuation frequency components of vibration which are caused by pressure fluctuation are reduced successfully in the X、Y and Z direction. The reducing vibration experiments fully indicate that the new dynamic vibration absorber with adjustable frequency which is designed in this paper has Very strong engineering application value. Related Articles | Metrics

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Design Method of Cantilever-beam Type Dynamic Vibration Absorbers 2017, 37(1): 158-162.  Abstract ( )   PDF (1231KB) ( )   Many scholars had put forward the design method of the cantilever structure with concentrated mass on the end. But for the cantilever beam-type dynamic vibration absorber (CBDVA), the mass block does not satisfy the assumption of particle. In order to put forward the design method with higher accuracy, three hypotheses had been proposed: 1) Euler-Bernoulli beam hypothesis; 2) rigid body hypothesis; 3) dynamic and static deflections are approximately the same. On this basis, the design method of CBDVA had been derived using energy method. The method considers the structural parameters of the mass block, which is simple and clear, so it is convenient for engineering application. Five numerical examples showed that, the proposed method keeps accurate and the maximum error is less than 3% for mass block and cantilever beam with different lengths and different sections. Due to simplicity, high precision, good availability, this paper has provided a new way for the practical design of CBDVA. Related Articles | Metrics

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Influence of micro structural parameters on sound insulation performance of membrane-type acoustic metamaterials 2017, 37(1): 163-166.  Abstract ( )   PDF (1229KB) ( )   According to FEA methods to calculate the transmission loss(TL) of membrane-type acoustic metamaterials. Morever, to explore the connection between frequencies of absorbed peaks(valleys) and eigenfrequencies of the whole system in the membrane-type acoustic metameterials. Then Apply the adjustments of micro structural parameters such as thickness, amplitude of center mass, prepress to learn the relationship of eigenfrequencies and absorbed peaks(valleys) of membrane-type acoustic metamaterials. The main conclusions are the corresponding frequencies of the absorption peaks (valleys) increase with the increase of the prestress of the membrane edge. The increase of membrane thickness leads to the decrease of the frequencies of transmission loss of the second peak and the third peak. And the amplitude of the central mass of the membrane only affect the frequencies of the first peaks (valleys). Related Articles | Metrics

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Research on Low Frequency Sound Absorption Property of the Structures Composed of Aluminum Fiber Sheets 2017, 37(1): 167-171.  DOI: 10.3969/j.issn.1006-1335.2017.01.036 Abstract ( )   PDF (1238KB) ( )   Related Articles | Metrics

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Damping Properties of Embedded Co-cured Composite Damping Structures after High Temperature Aging Treatment 2017, 37(1): 172-177.  DOI: 10.3969/j.issn.1006-1335.2017.01.037 Abstract ( )   PDF (1404KB) ( )   Using the experiment method, a new kind of viscoelastic damping material ingredient is presented which can co-cure with carbon fiber/ bismaleimides resin prepreg (T700/QY260）at 260 ℃ high temperature, after the mechanical properties, damping performance and high temperature resistant performance of AFLAS fluorine rubber is investigated synthetically. The viscoelastic damping material is dissolved in tetrahydrofuran dissol-vant to form viscoelastic material solution, and then the embedded high-temperature co-curing high damping composite specimens are manufactured on the basis of double-sided brush coating process and autoclave pro-cess autoclave process. The free vibration attenuation experiments of these specimens are used to measure the relative damping coefficient after aging experiment processing at normal temperature, 230℃*96h and 260℃*96h. The relationships of different aging temperature treatment with relative damping coefficient and damp-ing material thickness are obtained in detail. The results verify that embedded co-cured composite damping structure has excellent ultra high temperature resistance and stability of damping performance. Related Articles | Metrics

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Experimental Study on the Vibration Variation Law of Centrifugal Fans in Variable Operation Conditions 2017, 37(1): 178-182.  DOI: 10.3969/j.issn.1006-1335.2017.01.038 Abstract ( )   PDF (1402KB) ( )   Related Articles | Metrics

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Modal Density Measurement Test Based on Point Admittance Method 2017, 37(1): 183-187.  DOI: 10.3969/j.issn.1006-1335.2017.01.039 Abstract ( )   PDF (1241KB) ( )   Modal density is an important parameter in statistical energy analysis method when analyzing dynamic response in medium and high frequency bands. It can indicate the storage capacity of vibrating energy of a structural system. Modal density can be got by experiment using driving point admittance method. In this paper, the point admittance method was used to test modal density of a rectangle aluminum alloy plate. Impulse hammer excitations and swept-sine excitations were used respectively to get the result. The test result was modified by concerning the added mass of sensors. Experimental results show that different excitations have influence on the accuracy of test result; the influence of added mass on corrected result differs under different excitations in the same frequency. The test result under swept-sine excitations fits well with theoretical value after added mass correction. Related Articles | Metrics

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Modal Testing and Analysis of the Vibrating Screen 2017, 37(1): 188-190.  Abstract ( )   PDF (1234KB) ( )   Modal analysis is a modern method to study the dynamic characteristics of the structural, and is the application of system identification method in the field of engineering vibration. In this paper, by experimental modal analysis of a certain type of vibrating screen, we obtain the modal parameters, such as the natural frequency, damping ratio and mode shapes, and so on. Based on analyzing the problems existing in the design of the vibrating screen , we provide reference for subsequent modification of simulation calculation model and structure optimization design. Related Articles | Metrics

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Noise Control of Offices and Lounges in a Rolling Plant 2017, 37(1): 191-202.  DOI: 10.3969/j.issn.1006-1335.2017.01.041 Abstract ( )   PDF (1036KB) ( )   Related Articles | Metrics