Development of Vehicle Seat by Embedding Urethane Within Air Cell

2018 ◽  
Author(s):  
Shinichiro Ota ◽  
Yuji Nakamura
Keyword(s):  
Mechanical Properties ◽  
Resonance Frequency ◽  
Vibration Characteristics ◽  
Air Pressure ◽  
Damping Coefficients ◽  
Spring Constants ◽  
Vehicle Seat

This paper describes a new vehicle seat containing an air cell embedded with urethane. This air cell can be used to control mechanical properties such as spring constants and damping coefficients by varying the air pressure. When the air cell is retrofitted in a vehicle seat, it is essential for us to analyze its vibration characteristics, which is the aim of this study. Herein, after the air cell is retrofitted in a vehicle seat, its vibration characteristics are examined by performing excitation experiments using the prototype seat. From the results of this experiment, the resonance frequency of the human dummy (45.6 kg) was found to be 6.0 Hz when the pressure within the air cell was 2 kPa. However, the resonance frequency of the human dummy was found to be 5.3 Hz when the pressure within the air cell was 10 kPa. These results indicate that the vibration characteristics of the prototype seat can be varied by controlling the pressure within the air cell.

Self-excited Vibration Characteristics and Exciting Fluid Force of Multiple Plates Supported by Air Pressure

2020 ◽  
Vol 2020 (0) ◽  
pp. 610
Author(s):  
Shunsuke YAMAZAKI ◽  
Masakazu TAKEDA ◽  
Keiichi HIROAKI ◽  
Masahiro WATANABE
Keyword(s):  
Vibration Characteristics ◽  
Air Pressure ◽  
Fluid Force ◽  
Excited Vibration

scholarly journals Vibration Analysis and Experimental Research of the Linear-Motor-Driven Water Piston Pump Used in the Naval Ship

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Ye-qing Huang ◽  
Song-lin Nie ◽  
Hui Ji ◽  
Shuang Nie
Keyword(s):  
Resonance Frequency ◽  
Low Frequency ◽  
Linear Motor ◽  
Vibration Characteristics ◽  
Piston Pump ◽  
Response Analysis ◽  
Design And Optimization ◽  
Naval Ship ◽  
Vibration Experiment ◽  
Low Efficiency

Aiming at the existing problems of traditional water piston pump used in the naval ship, such as low efficiency, high noise, large vibration, and nonintelligent control, a new type of linear-motor-driven water piston pump is developed and its vibration characteristics are analyzed in this research. Based on the 3D model of the structure, the simulation analyses including static stress analysis, modal analysis, and harmonic response analysis are conducted. The simulation results reveal that the mode shape under low frequency stage is mainly associated with the eccentricity swing of the piston rod. The vibration experiment results show that the resonance frequency of linear-motor-driven water piston pump is concentrated upon 500 Hz and 800 Hz in the low frequency range. The dampers can change the resonance frequency of the system to a certain extent. The vibration under triangular motion curve is much better than that of S curve, which is consistent with the simulation conclusion. This research provides an effective method to detect the vibration characteristics and a reference for design and optimization of the linear-motor-driven water piston pump.

Dynamic Testing of Mechanical Properties of a Substrate Using Phase-Locked-Loop

2005 ◽  
Author(s):  
Matthew Clark ◽  
Z. C. Feng
Keyword(s):  
Mechanical Properties ◽  
Nonlinear Systems ◽  
Theoretical Result ◽  
Resonance Frequency ◽  
Mechanical Model ◽  
Dynamic Testing ◽  
Phase Locked Loop ◽  
System Frequency ◽  
The Relationship

This paper explores dynamically deriving the mechanical properties of a substrate. A method is presented in which a phase locked loop (PLL) is used to find the resonance frequency of a mechanical model consisting of an oscillating probe and a material substrate. This is done by first presenting an accurate PLL which is stable for nonlinear systems. The relationship between the system frequency and the stiffness of the material substrate is derived theoretically. The stiffness of the substrate is obtained by combining the theoretical result and the converging resonance frequency from PLL.

Vibration characteristics analysis and structure optimization of air-pressure subsoiler

2021 ◽  
pp. 095745652110526
Author(s):  
Hongjie Su ◽  
Hongmei Cui ◽  
Feiyu Li ◽  
Chaolun Yideer ◽  
Yaxiong Zhu ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Structural Reliability ◽  
Excitation Frequency ◽  
Structure Optimization ◽  
Time Domain Analysis ◽  
Vibration Characteristics ◽  
Air Pressure ◽  
Excitation Source ◽  
External Excitation ◽  
Actual Production

Aiming at the problems of strong vibration, inconsistent subsoiling depth and high failure rate of air-pressure subsoiler, air-pressure subsoiler vibration characteristics was studied. In order to decrease the vibration, For the first time, the vibration characteristics of air-pressure subsoiler were obtained by modal analysis and vibration test. The vibration characteristics of the whole air-blown subsoiler are analyzed Through time domain analysis, it is found that the vibration acceleration of four deep loosening shovel is inconsistent. When the diesel engine is started, it is easy to cause inconsistent subsoiler depth. Then, by analyzing the vibration characteristics of the whole air-pressure subsoiler, it can be known that the external excitation source of the air-blown subsoiler is close to its own natural frequency. In order to avoid resonance caused by the vibration frequency of the external excitation source being close to the natural frequency of the air-pressure subsoiler, and to reduce the inconsistency of the subsoil depth, we optimize the design of air-pressure subsoiler. Instead of diesel engines, the steering gear box is connected with tractor power output shaft to provide power. The modal simulation of the optimized air-pressure subsoiler shows that the first-order natural frequency is obviously improved and the external excitation frequency is successfully avoided. It not only avoids resonance, reduces the damage of resonance components, but improves the service life of the subsoiler, greatly improves the structural reliability of the air-pressure subsoiler, at the same time, removes the main external excitation source, which greatly reduces the vibration in actual production and the inconsistency of subsoiling, which is of great significance in actual production. It provides a reference for the research of vibration characteristics, resonance avoidance and structure optimization of agricultural equipment.

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