AbstrakAKinematika dan dinamika mesin melibatkan desain mesin atas dasar kebutuhan gerak mereka. Kombinasi bagian yang saling berhubungan memiliki gerakan yang pasti dan mampu melakukan pekerjaan yang berguna dapat disebut mesin. Mekanisme adalah komponen dari mesin yang terdiri dari dua atau lebih badan diatur sedemikian rupa sehingga gerakan satu memaksa gerakan yang lain. Desain kereta listrik otomotif (sejenis mesin) sangat ditentukan oleh beberapa mekanisme, termasuk hubungan slider-engkol, cam dan follower hubungan, dan kereta gigi. Banyak mekanisme yang melibatkan gerak planar, gerak dalam satu pesawat atau di aset bidang sejajar. Kasus yang lebih umum, gerak spasial, berlaku untuk mekanisme di mana gerakan harus dijelaskan dalam tiga dimensi. Analisis kinematika dilakukan di bawah grafis pada umumnya, seperti metode poligon yang menangkap mekanisme dalam satu saat. Cara alternatif lain untuk masalah ini adalah melibatkan metode matematika. Solusi ini memberikan cara yang akurat dan tercepat karena didukung oleh teknologi komputer. Tujuan dari proyek ini adalah untuk menentukan rumus untuk posisi, kecepatan, dan pernyataan percepatan mesin gergaji dengan menggunakan Mathlab. Kata kunci: mekanisme, gerak (posisi, kecepatan dan percepatan), metode poligon AbstractKinematics and dynamics of machinery involve the design of machines on the basis of their motion requirements. A combination of interrelated parts having definite motions and capable of performing useful work may be called a machine. A mechanism is a component of a machine consisting of two or more bodies arranged so that the motion of one compels the motion of the others. The design of an automotive power train (a type of machine) is concerned with several mechanism, including slider-crank linkages, cam and follower linkages, and gear trains. Many mechanisms undergo planar motion, motion in a single plane or in asset of parallel planes. The more general case, spatial motion, applies to mechanism in which the motion must be described in three dimensions. Kinematics analysis is done under graphically in general, such as polygon method which capture the mechanism in one moment. Another way to alternate this problem is involve any mathematical method. This solution gave the accurate and fastest way because supported by computer technology. The aim of this project is to determine the formula for position, velocity, and acceleration statement of the sawing machine by using Mathlab.Keywords: mechanism, motion (position, velocity and acceleration), polygon method
Effort to increase productivity calls for increasingly higher operating speed. Consequently, many part of a machinery are made as light as possible to avoid the detrimental inertial effects. This condition means several of the elements are no longer rigid and tend to experience elastic deformation in operation. The existence of the deformation yields element possessing position dependent dynamic parameters. Mechanisms with timevarying parameter have a phenomenon known as parametric instability where the mechanism could becomes dynamically unstable at several frequency bands, even at relatively low excitation frequency. This research investigates the dynamic behaviour of a flexible coupler on an experimental four-bar mechanism setup. The study examines the coupler vibration response due to varying crank length and crank speed.
AbstrakBantalan menyediakan antarmuka utama antara bagian-bagian mesin yang bergerak dan tidak bergerak. Bantalan memberikan sebagian besar kekakuan dan redaman untuk struktur yang bergerak. Dapat dimengerti bahwa gaya dinamis yang dikembangkan pada bagian yang bergerak ditransmisikan ke bagian stasioner melalui bantalan penyangga utama ini. Gaya tersebut dapat berupa beban radial statis karena berat rotor, atau mungkin gaya dinamis karena mekanisme seperti ketidakseimbangan massa. Dalam kedua kasus tersebut, bantalan radial harus membawa beban yang diterapkan, atau mesin akan mengalami kegagalan. Dalam kebanyakan kasus, secara teknis sulit (jika bukan tidak mungkin) untuk secara langsung memeriksa validitas atau akurasi dari koefisien bantalan yang dihitung. Namun, setiap perhitungan harus diakhiri dengan keseimbangan gaya, ditambah keseimbangan posisi jurnal dalam jarak bebas bantalan. Karena jurnal dalam bantalan film-oli dapat diukur secara langsung dengan proximity probes, logis untuk melakukan pemeriksaan prediksi analitik versus data mesin yang sebenarnya. Proximity probe sensorik dipasang pada ± 450 dari garis tengah vertikal sebenarnya. Pada bantalan ujung saluran masuk turbin # 1, probe dipasang di atas poros. Sebaliknya, di exhaust # 2 bantalan, probe terletak di bawah poros. Untuk penelitian pada kasus ini dilakukan pada empat turbin gas poros tunggal yang beroperasi antara 5.000 dan 5.350 RPM. Unit ini memiliki daya 40.000 HP, dan digunakan untuk menggerakkan kompresor sentrifugal bertekanan tinggi melalui satu kotak roda gigi heliks. Dapat dimengerti bahwa jika posisi eksentrisitas yang dihitung benar, maka parameter yang dihitung lainnya juga mewakili karakteristik bantalan. Kata kunci: journal bearing, turbin gas, proximity probe, posisi eksentrisitas. Abstract Bearings provide the primary interface between the moving and the stationary parts of a machine. Although the seal and the process fluids (or magnetic fields) coexist, the bearings provide the majority of the stiffness and damping for the moving assembly. It is understandable that dynamic forces developed on the moving part are transmitted to the stationary part across these main support bearings. The forces may be the static radial loads due to the rotor weight, or they may be dynamic forces due to mechanisms such as mass unbalance. In either case, the radial bearings must carry the applied loads, or the machine will fail. In most cases, it is technically difficult (if not impossible) to directly check the validity or accuracy of the computed bearing coefficients. However, each calculation must conclude with a force balance, plus a position balance of the journal within the bearing clearance. For this case history, consider a group of four single shaft gas turbines that operate between 5,000 and 5,350 RPM. These units are rated at 40,000 HP, and they are used to drive high pressure centrifugal compressors through a single helical gear box. The shaft sensing proximity probes are mounted at ±450 from the true vertical centerline. At turbine inlet end#1 bearing, the probes are mounted above the shaft. Conversely, at the exhaust end #2 bearing, the probes are located below the shaft. Since journal within an oil film bearing can be measured directly with proximity probes, it is logical perform a check of the analytical prediction versus actual machine data. It is reasonable to believe that if the calculated eccentricity position is correct, than the other computed parameters are also representative of the bearing characteristics. Keywords: journal bearing, gas turbine, proximity probes, eccentricity position.
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