Tài liệu miễn phí Cơ khí

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Tài liệu miễn phí Cơ khí - Chế tạo máy

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Khai thác nguồn lực cá nhân để thúc đẩy, mở rộng công tác liên kết, hợp tác với các doanh nghiệp của khoa Cơ khí - Động lực và nhà trường

Trong xã hội hiện đại, nguồn nhân lực đóng vai trò quan trọng nhất đối với sự phát triển của bất kỳ một quốc gia nào trên thế giới nói chung và Việt Nam cũng như trường Đại học Công nghiệp Quảng Ninh nói riêng, bởi vì nếu có những con người tài năng, có năng lực chuyên môn, có bản lĩnh thì việc khai thác và sử dụng các nguồn lực khác mới có hiệu quả và mang lại nhiều lợi ích cho xã hội. Bài viết trình bày thực trạng công tác liên kết, hợp tác với các doanh nghiệp hiện nay ở trong khoa Cơ khí - Động lực và nhà trường.

4/5/2023 7:38:18 PM +00:00

Improving the tool life of ceramic cutting insert when machining difficult-to-cut alloy steel

This article proposes various techniques employed in improving the tool life of ceramic cutting insert as compared to commercial cutting tool. Experimental tests were carried out to check the efficiency of one of the proposed techniques using ISO 3685 standard. The results revealed that notch and flank wears were dominant morphology during cutting process.

4/5/2023 7:35:23 PM +00:00

Effect of substrate bias on thicknesses and hardness of TiN film created by arc technology

This study is aimed to investigate the influence of substrate bias on thicknesses and hardness mechanical properties of arc deposition technology TiN coating which is prepared on the surface of SKD61 alloy and Silic. The thicknesses of coatings were detected by examining the cross-sectional optical microscope image base on Silic sample.

4/5/2023 7:35:02 PM +00:00

A low power, low noise chopper instrumentation amplifier using body control DC servo loop and low input capacitance

This paper presents a proposed low power, low noise capacitively-coupled chopper instrumentation amplifier (CCIA) using body control DC servo loop and low input capacitance applied for biomedical recording. A DC servo loop using body control (DSL-BC) is proposed to reduce the electrode offset and its noise contribution.

4/5/2023 7:34:29 PM +00:00

Step skewing rotor design of permanent magnet BLDC motor for inwheel electric vehicle

In this paper, the skewing slot is applied to the PM surface mounted Brushless DC Motor 20kW 36 slots and 12 magnet poles (Z = 36, p = 12) for eliminating torque ripples. To observe the skewing stator effect, the stator lamination layers are skewed with different angles. With determined skewing angle, the cogging torque eliminated theoretically and flux density space harmonics are also reduced

4/5/2023 7:33:44 PM +00:00

Improve the torque characteristic of axial flux permanent magnet motors for inwheel motor cycles

In this paper, the axial flux permanent magnet motor with concentrated winding, axial flux, segmental rotor is proposed to compare with the conventional BLDC motor. The proposed topology has permanent magnet segments and slotted stator. In order to compare with the existing BLDC motors, an amount of permanent magnets is considered to scale up power and torque.

4/5/2023 7:33:36 PM +00:00

Bài giảng môn học Cơ kết cấu tàu - Đỗ Hùng Chiến

Nội dung bài giảng trình bày cơ kết cấu tàu giải quyết các bài toán về độ bền và độ cứng của kết cấu tàu, đảm bảo độ bền đồng nghĩa với việc giảm chi phí cho nguyên vật liệu, tức là giảm giá thành cho con tàu được đóng và khoa học, cung cấp cho người kỹ sư đóng tàu các phương pháp tính toán kết cấu vỏ tàu về độ bền và độ cứng, gọi là cơ kết cấu tàu thủy. Mời các bạn tham khảo!

4/5/2023 6:49:15 PM +00:00

Bài giảng Tĩnh học tàu thủy - KS. Đỗ Hùng Chiến

Bài giảng Tĩnh học tàu thủy do KS. Đỗ Hùng Chiến nhằm trình bày vài nét về sự phát triển ngành tàu thuyền, các loại tàu thông dụng hiện nay và điều kiện cân bằng tàu trong trạng thái nổi. Mời các bạn tham khảo!

4/5/2023 6:49:05 PM +00:00

Lecture Electronic materials - Chapter 32: Digital logic gates

Lecture Electronic materials - Chapter 32: Digital logic gates rovide students with knowledge about using non-basic logic gates, Ideal inverter characteristics, actual inverter implementation.

4/5/2023 6:40:50 PM +00:00

Lecture Electronic materials - Chapter 31: What makes up an Op-Amp: 741 example

Lecture Electronic materials - Chapter 31: What makes up an Op-Amp: 741 example provide students with knowledge about using an active load (transistors), we obtain the “Full” gain of a CE stage even though we have a single-ended output. (Remember that for a passive load, resistor, the single ended gain was half the CE gain).

4/5/2023 6:40:43 PM +00:00

Lecture Electronic materials - Chapter 30: Operational Amplifier frequency Response

Lecture Electronic materials - Chapter 30: Operational Amplifier frequency Response provide students with knowledge about inserting the frequency dependent open loop gain, real op Amp frequency response.

4/5/2023 6:40:36 PM +00:00

Lecture Electronic materials - Chapter 29: Operational amplifier frequency response

Lecture Electronic materials - Chapter 29: Operational amplifier frequency response provide students with knowledge about ideal op amps used to control frequency response, real op amp frequency response.

4/5/2023 6:40:30 PM +00:00

Lecture Electronic materials - Chapter 28: Operational amplifiers

Lecture Electronic materials - Chapter 28:Operational amplifiers provide students with knowledge about operational amplifier or “Op-Amp” is a multistage amplifier that is used for general electrical signal manipulation. The numbers of applications possible with Op-amps are two numerous to list.

4/5/2023 6:40:18 PM +00:00

Lecture Electronic materials - Chapter 27: Amplifier configurations

Lecture Electronic materials - Chapter 27: Amplifier configurations provide students with knowledge about Any signal source has a finite “source resistance”, RS .The amplifier is often asked to drive current into a load of finite impedance, RL (examples: 8 ohm speaker, 50 ohm transmission line, etc…).

4/5/2023 6:40:07 PM +00:00

Lecture Electronic materials - Chapter 26: MOSFET small signal model

Lecture Electronic materials - Chapter 26: MOSFET small signal model provide students with nowledge about determine the amplifier output parameters for very small input signals, Amplifier output parameters.

4/5/2023 6:39:56 PM +00:00

Lecture Electronic materials - Chapter 25: MOSFET basics

Lecture Electronic materials - Chapter 25: MOSFET basics provide students with nowledge about with our expression relating the Gate voltage to the surface potential and the fact that S=2F we can determine the value of the threshold voltage.

4/5/2023 6:39:46 PM +00:00

Lecture Electronic materials - Chapter 24: MOSFET Basics (Understanding with no math)

Lecture Electronic materials - Chapter 24: MOSFET Basics (Understanding with no math) provide students with nowledge about the electron concentration in the inversion layer near the drain decreases as they are “sucked out” by the Drain voltage.

4/5/2023 6:39:36 PM +00:00

Lecture Electronic materials - Chapter 23: Metal oxide capacitors

Lecture Electronic materials - Chapter 23: Metal oxide capacitors provide students with knowledge about the capacitor itself forms the basis of digital logic circuits, and DRAM storage units (storing charge) or can simply supply a capacitance for an analog integrated circuit. It will also be the building block for the most common transistor produced – the MOS transistor.

4/5/2023 6:39:27 PM +00:00

Lecture Electronic materials - Chapter 22: Understanding BJT circuits - Clearing up some confusion

Lecture Electronic materials - Chapter 22: Understanding BJT circuits - Clearing up some confusion provide students with knowledge about forward biased, the current in the base-emitter junction would consist of holes injected into the emitter from the base and electrons injected into the base from the emitter.

4/5/2023 6:39:20 PM +00:00

Lecture Electronic materials - Chapter 21: Hand example, SPICE example, and limits on output swing imposed by having to stay within forward active mode

Lecture Electronic materials - Chapter 21: Hand example, SPICE example, and limits on output swing imposed by having to stay within forward active mode provide students with knowledge about recognize that our choice of generic labeling allows us to use the equations developed for the pnp transistor here even though you were given a npn transistor.

4/5/2023 6:39:10 PM +00:00

Lecture Electronic materials - Chapter 20: Small signal BJT model

Lecture Electronic materials - Chapter 20: Small signal BJT model provide students with knowledge about base width changes due to changes in the basecollector depletion.

4/5/2023 6:39:03 PM +00:00

Lecture Electronic materials - Chapter 19: Ebers moll large signal bjt model, using CVD model to solve for DC bias point

Lecture Electronic materials - Chapter 19: Ebers moll large signal bjt model, using CVD model to solve for DC bias point provide students with knowledge about equip the student with essential knowledge about

4/5/2023 6:38:57 PM +00:00

Lecture Electronic materials - Lecture 18: Quantitative understanding - Do the math!

Lecture Electronic materials - Lecture 18: Quantitative understanding - Do the math! provide students with knowledge about bipolar junction transistor (BJT) quantitative solution, Collector quasi-neutral regions.

4/5/2023 6:38:50 PM +00:00

Lecture Electronic materials - Lecture 17: Qualitative understanding - How do they work?

Lecture Electronic materials - Lecture 17: Qualitative understanding - How do they work? provide students with knowledge about bipolar junction transistor fundamentals, electrostatics in equilibrium, PNP bipolar junction transistor.

4/5/2023 6:38:41 PM +00:00

Lecture Electronic materials - Lecture 16: Photodiodes, solar cells (photovoltaic devices), and multiple diode analysis

Lecture Electronic materials - Lecture 16: Photodiodes, solar cells (photovoltaic devices), and multiple diode analysis provide students with knowledge about diode is assumed on, verify the current calculated flows in the correct direction consistent with the diode being on, only one solution exists for a given model (ideal or CVD).

4/5/2023 6:38:30 PM +00:00

Lecture Electronic materials - Lecture 15: Large signal (complete model) and small signal (limited use) models of a diode

Lecture Electronic materials - Lecture 15: Large signal (complete model) and small signal (limited use) models of a diode provide students with knowledge about the voltage across the diode is zero for forward bias. The slope of the current voltage curve is infinite for forward bias. The current across the diode is zero for reverse bias.

4/5/2023 6:38:23 PM +00:00

Lecture Electronic materials - Lecture 14: Quantitative analysis (Math, math and more math)

Lecture Electronic materials - Lecture 14: Quantitative Analysis (Math, math and more math) provide students with knowledge about equip the student with essential knowledge about quantitative p-n diode solution, solve minority carrier diffusion equation in quasi-neutral regions, determine minority carrier currents from continuity equation, evaluate currents at the depletion region edges.

4/5/2023 6:38:17 PM +00:00