Effects of Work on Shock Absorber and Spiral Springs Against Vertical Loads of Vehicles Burdening the Road Structure

Abstract

This research aims to examine the effect of vertical dynamic load of vehicles and changes in dimensional barriers on the road surface in its path. Experimentally this fluctuating load is replaced by a pneumatic force change based on the regulation of air pressure on the regulator. The deviations generated by the varying load work are measured by placing a proximity sensor along the spring movement. The amount of vertical load transformation reaches the road surface is measured by using Load cell. Characteristics of vertical dynamic vibration occurring due to several dimensional barriers, U (cm) obtained using mathematical modelling method with 2 DOF suspension system transfer function. The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14 seconds with deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d = 1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is only duration t = 0.22 s, because the spring reaction force and shock absorber can absorb 45% vibration against the sprung and un-sprung vertical load of the vehicle.

Pengaruh Pahat Endmill Normal Dan Variabel Helix Angle Pada Metode Pocket Zig-Zag Terhadap Chatter

“…Ini secara grafis diwakili dalam stability lobe diagram (SLD) dimana batas aman antara kondisi unchatter dan chatter digambarkan [11] . Dari hasil penelitian yang pernah dilakukan dapat diambil kesimpulan untuk gejala chatter dapat dikurangi dengan metode cssv (continuous spindle speed variation) dengan mengunakan variable helix tool, yang dimana semakin tinggi nilai spindle speed dan semakin rendah nilai dari depth of cut berdampak mereduksi timbulnya chatter atau gejala chatter pada proses pemesinan yang di sebabkan oleh gesekan tool dan material [12] , tool ini memiliki variasi kemiringan disetiap flute sehingga bisa memecah efek getaran yang dihasilkan dari material dan tool . Dan didalam penelitian ini akan membuktikan seberapa efektif penggunaan variable helix tool dibandingkan dengan menggunakan normal helix tool, untuk arah pemakanan normal (zig-zag).…”