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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Akbar, Musthafa
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Engineering

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Balancing Rotor Dinamik Menggunakan Sinyal Suara Saputra, Ariadi; Huda, Feblil; Akbar, Musthafa
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Rotating machines that have been operating within a certain period of time there is frequent vibration. The vibration is usually caused by unbalance, misalignment, bearing defect, and others. Unbalance is ranked as a first cause of vibration, which more than 80% cases of vibration caused by unbalance. This condition causes the balancing process needs to be done. A commonly method of vibration measurement uses vibration sensors such as accelerometer or vibrometer, that should be affixed to the machine in operation. This can cause discomfort and may even dangerous the operator when measuring the machines. The solution of the problem can be done using non contact measurement, where the sensor is not attached directly to the test equipment. Microphone is a device that can record the sound signal without necessarily contact the tested device. The unbalance tendency of the test is characterized by the presence of the dominant frequency at one rotational speed (1 x rpm). From the test, the result of balancing of normal condition on one rotor and two rotors are 0.039 V and 0.031 V with balancing efficiency 87.88% and 80.74% respectively. The addition of unbalance mass on one rotor and two rotors is obtained balancing result of 0.031 V and 5.88x10-3 V with efficiency balancing of 93.58% and 97.43% respectively.Keywords : voice signal, unbalance, balancing, microphone, unbalance mass
Optimasi Desain Crash Box Tipe Square Dengan Beban Impak Arah Aksial Putrawani, Eky; Akbar, Musthafa
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Crash box is one of the passive security system technology that serves to absorb impact energy when the car suffers a collision. The Crash box has a parameter crashworthiness which is a parameter that indicates the durability of structures to protect a passenger during collision. The crashworthiness parameters in the crash box is energy absorption (EA), primary Peak Force (Pmax), mean crushing force (Pm), crushing force efficiency (CFE), and specific energy absorption (SEA). In this research conducted optimization of the design of the crash box with numerical analysis using software-based finite element method Abaqus CAE ver. 6.14-2. This research was conducted to get the design of the crash box which has the most optimal crashworthiness parameter value of some model of the square type crash box design with an impact load axial direction. The design Model of the crash box is analyzed include adding design modifications using triggers, multi segments, and rib. The selected crash box Material used is Alumunium AA6060-T4. Base on analysis carried out the design model of the crash box with the addition of rib (R06) as a design model that has the most optimal crashworthiness parameters. The R06 design Model increases energy absorption (EA) by 0.02 kJ (0.37%), lowering primary peak force (Pmax) by 10.72 kN (21.16%), increasing mean crushing force (Pm) of 0.11 kN (0.37%), increasing crushing force efficiency (CFE) of 15.81% (27.32%), but lowering the specific energy absorption (SEA) of 0.91 kJ/kg (4.63%). Keyword : Crash Box, Design Optimization, Crashworthiness Analysis
Co-Authors Huda, Feblil Putrawani, Eky Saputra, Ariadi