دانلود ترجمه مقاله نیروی مقاومت یک کمک فنر شامل ذرات مغنا طیسی در اندازه های میکرومتر و نانومتر – مجله الزویر

• فهرست مطالب:

 چکیده
۱ مقدمه
۲ روش تجربی
۳ نتایج و بحث
۴ نتیجه گیری

• بخشی از ترجمه:

اثر ترکیب مایع مغناطیسی عملکردی ،میدان مغناطیسی وبار در نیروی مقاومت کمک فنربا استفاده از مایع عملکردی مغناطیسی مورد مطالعه قرار گرفت ودر ادامه نتایج زیر بدست آمده است .
1-نیروی مقاومت کمک فنر شامل ويسكوزيته واصطکاک است.
2-بعنوان کسر حجمی ذرات مغناطیسی با ابعاد نانو منجر به افزایش مایع عملکردی مغناطیسی و افزایش اصطکاک تحت میدان مغناطیسی ضعیف می شود و به عنوان کسر حجمی ذرات مغناطیسی با ابعاد میکرومتر ،افزایش اصطکاک تحت میدان مغناطیسی نه چندان قوی بوجود می آید.
3-به عنوان کاهش مغناطیسی یا افزایش بار جابجایی لازم است تا نیروی مقاومت ثابت شود.

• بخشی از مقاله انگلیسی:

Introduction Applications utilizing magnetic functional fluids having both micrometer- and nanometer-sized magnetic particles have been developed [1]. The size of clusters, the meso-scale structure formation of particles and the cohesion between the magnetic particles are affected by the mixture ratio of the magnetic particles of different sizes in the magnetic functional fluids. Therefore, resistance force properties of the shock absorber using the magnetic functional fluids are influenced by the mixture ratio of the micrometer- and nanometer-sized magnetic particles. In this paper, resistance force of a shock absorber is investigated experimentally. Two magnetic functional fluids whose mixture ratio of micrometer- and nanometer-sized magnetic particles is different are prepared for the experiment. The resistance forces are measured when load is applied to the shock absorber under magnetic field.2. Experimental method Schematic diagram of the shock absorber is illustrated in figure 1. The cylinder (A) is filled with the magnetic functional fluid. The piston (A) is moved with the shaft. The shaft penetrates the cylinder (A) so as to maintain the capacity inside the shock absorber constant. The coil is installed on the cylinder (A) to apply magnetic field to the magnetic functional fluid. Figure 2 shows the distribution of the magnetic flux density when an electric current is applied to the coil. Figure 3 illustrates the schematic diagram of our experimental apparatus. The shock absorber is attached in the plumb direction. When high pressure air in the air tank is opened by the solenoid valve momentarily, pressure in the cylinder (B) suddenly rises and load is applied to the shock absorber through the piston (B). The load can be changed by adjusting the pressure of the air in the tank. When a load is applied to the shock absorber, displacement and resistance force of the shock absorber are produced. The displacement of the shaft is measured by the laser displacement sensor and the amplifier unit (Keyence Corp., LB-300 and LB-1200), while the resistance force is measured by the load cell and the strain amplifier (Kyowa Electronic Instruments Co., Ltd., LUX-A-1kN and DPM-751A). Table 1 shows the components of the magnetic functional fluids prepared for our experiments. Each magnetic functional fluid has the same total volume fraction of magnetic particles. Thus, the number of magnetic particles included in fluid-1 is larger than that of magnetic particles included in fluid-2. The load applied to the shock absorber (pressure of the air) and the magnetic field applied to the magnetic functional fluid (electric current supplied to the coil) are experimental conditions as shown in table 2. 3. Result and discussion Figure 4(a) illustrates the time history of the displacement. When the solenoid valve is opened and the load is applied to the shock absorber at time of 0 second, the displacement of the shock absorber is increased in proportion to the time. After about 0.1 second, the piston (B) is out of the cylinder (B). Thus, the load to the shock absorber disappears and the displacement of the shock absorber becomes constant. Such a displacement pattern is the same in all experimental conditions. However, the time when the displacement becomes constant and the gradient of the displacement are different in each experimental condition. Figure 4(b) shows the time history of the resistance force and displacement speed. The resistance force results from viscosity and solid friction due to the particle±particle interactions and particle±solid surface interactions. The resistance force and the displacement speed suddenly increase just after load applied to the shock absorber. Both of the resistance force and the displacement speed become the constant value afterwards. The time history of resistance force and the time history of the displacement speed have the same waveform pattern. Therefore, the resistance force of the shock absorber rests on the viscosity which depends on the displacement speed. In addition, the time when the resistance force becomes constant is earlier than the time when the displacement becomes constant. Thus, the resistance force of the shock absorber has the friction which is independent of the displacement speed.