# What is Drum: Definition and 93 Discussions

The drum is a member of the percussion group of musical instruments. In the Hornbostel-Sachs classification system, it is a membranophone. Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player's hands, or with a percussion mallet, to produce sound. There is usually a resonance head on the underside of the drum, typically tuned to a slightly lower pitch than the top drumhead. Other techniques have been used to cause drums to make sound, such as the thumb roll. Drums are the world's oldest and most ubiquitous musical instruments, and the basic design has remained virtually unchanged for thousands of years.Drums may be played individually, with the player using a single drum, and some drums such as the djembe are almost always played in this way. Others are normally played in a set of two or more, all played by the one player, such as bongo drums and timpani. A number of different drums together with cymbals form the basic modern drum kit.

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1. ### I Uncovering the Forces on Drum Lugs: An Engineering Design Exploration

I am currently designing an alternative to normal acoustic drum lugs and I need to find the forces that are felt by the tuning rods of a drum for the engineering background to my design. I have been able to use the 2D wave equation assuming uniform tension on the membrane and found values of the...
2. ### B How long does it take for the liquid in a 55-gallon drum to thaw?

I am trying to calculate the rate of thaw for a 55 gallon drum of frozen juice. I know the surface area of the drum is 20,772 sq cm. I know the starting temperature of the frozen juice (-10C) and I know the ambient temperature the drum is currently in (10C). What is the equation that will...
3. ### Tilting a 55 Gal Plastic Drum: Calculating Force Needed

I have been tasked with tilting a plastic 55 gallon drum that contains lube to an angle of about 20 degrees. I would like to use pneumatic cylinders as air is readily available here. The plastic barrel has a 23.5 inch diameter and is 35 inches tall. The barrel and contents weighs 450 pounds...
4. ### B Calculating the torque needed to rotate a drum

Imagine this: You have a drum with a radius of 12cm, around that drum is a toothed belt which is connected to a motor. The drum weighs 10kg The motor should be placed under the drum How would I calculate the amount of torque needed to rotate the drum I don't have any idea how to calculate this...
5. ### Calculate the dose rate in a drum of U3O8

Summary:: Calcul of dose rate. Hello everyone ! I have to calculate the total dose that an operator takes during different tasks in a workshop. . I must not use numerical software, so it's only calculous with the data I have. My question could be considered as stupid but the engineer in...
6. ### MIT 8.01: Unwinding Drum Problem

I'm self-studying MIT OCW's 8.01, Introduction to Classical Mechanics Course. I am on the final week, where the topic is translational and rotational motion. I was following along the course notes and reached an example which I'd like to dive a bit deeper into, but I am not sure how. The problem...
7. ### Problem with my Venturi operated Drum Vac

Hey guys, I have built a Compressed air venturi operated Drum Pump for my garage. The system consists of a horizontal venturi tube with a pipe (shut-off tube) that is inserted into the Drum. Turning on the venturi creates vacuum in the drum and thus liquid is sucked from outside and is collected...
8. ### Art Notation for drum parts when scores were hand written?

In the days when scores were written by hand, how were parts for drums written? It's clear that ordinary notation is sufficient to indicate the duration of dumb beats - although writing each beat for a drum would be tedious. Was there some system of abbreviation? Did composers attempt to...
9. ### Engineering How to find the angular velocity of a rotating drum?

Good day here is the exerciceThe only velocity I do have is the velocity v os the center of pulley 5, I tried to find the center of instantaneous velocity to find the angular velocity of pulley 5 but I couldn't, any hint would be highly appreciated! Best regards!
10. ### Discovering Drum Head Patterns for Music Education

Hey everyone - I run a music school and learning about how sound works is really helpful in talking about tone production, volume, and just understanding in general what's going on. As part of that,. I'm looking for a pattern that I could print on a drum head that would show how the head moves...
11. ### Drum and Cable Problem - Formula and Workings

Hi everyone, please could someone assist in the formula for the above A, B, C, D, E and F in order for me to try and resolve the maths questions, I'm just a little stuck on the formula, Thanks in advance all :-)
12. ### Analytical mathematical modeling of the torque caused by the laundry

Hello my dear physicists, I'm trying to model the varied generated (needed)Torque to rotate a washing machine Drum during a Washing Process so i assumed that the Model has as Input the target vilocity and as an Output the new needed torque to rotate the Drum(to be as a input for the motor...
13. ### B Kill drum head overtones without anything touching the drum head

Hi All, I considered filing a patent for this invention, but instead decided to publish it so people could use it to advance the state-of-the-art in drums. You don't need to add tape or pillows to your drum heads to muffle the overtones. Using tape or pillows also kills the strike of the...
14. ### Drum rotation, lateral loads and point of pull

I farm and have built water control devices for my rice operation that use a cable and drum setup. The moving part is a 24"water tight rotary union that we rotate with a cable that originates in a dual spool winch above the center line of rotation for the drum. The winch cables secure to the...
15. ### What is the force required to upright a tipped drum?

Summary: 55 gallon drum weighing 518 pounds is tipped over. How much force is needed to upright the tipped drum? I am an environmental, health and safety professional in the food manufacturing industry. We recently had two employees that came upon a 55 gallon drum that was tipped over. The...
16. ### Appliances DIY Drum Coffee Roaster: Motor Power Help Needed

Hello, My name is Héctor and I love coffee, I'm working on a diy drum coffee roaster. Drum + load= 50 pounds, rotation needed = 10-60 Rpm, length from 20 to 30 cm. How can I determine the motor power that can turn my drum? Can someone help me please? Thank you in advance
17. ### Calculating Linear and Angular Motion in a Drum and Cable System

Hi, I'm studying a hnc in mechanical engineering. One of the maths problems I have been given involves a drum and cable. It states the diameter(0.8m), mass (3kg), initial velocity (0m/s), time to descend (0.5secs) and distance traveled (0.25m) I need to find: A)final linear velocity of the...
18. ### Auto/Motor Finding a Drum for Motor Shaft to Lift 5kg Box

Hello, I'm trying to use this gearbox motor as a winch to lift up a small box (5kg), however it needs to have some sort of drum that's mounted to the motor shaft to wrap the string around. Although I'm unable to find anything suitable that I could use. Is there already something that exists that...
19. ### A package of mass m is placed inside a drum

Homework Statement 13.69 A packege of mass m is placed inside a drum that rotates in the vertical plane at the constant angular speed ##\dot {θ} = 1.36 rad/s##. If the package reaches the position θ = 45deg before slipping, determine the static coefficient of friction between the package and...
20. A

### Number of rotation till the drum comes rest

Homework Statement A solid cylinder rotates till it comes to rest. It has inititial angular velocity. To stop the drum a mass m ishung the belt which has a friction coefficient with the drum material as u we have to find no of rotationd all the data is known and correct Homework Equations...
21. ### Acc. of a drum joined to another drum with metal tape

Homework Statement Homework EquationsThe Attempt at a Solution For drum A, Eqn. of COM motion gives, ## T(\hat y ) + Mg (- \hat y ) = M a_A (\hat y ) ## ; ## a_A = - |a_A| ## eq (1) I need to know T here for getting ## a_A ##. For drum B, Eqn. of COM motion doesn't give...
22. ### Rotation of a drum attached to a spring

Homework Statement Rotation of a small drum of mass moment of inertia 0.44kg.m^2 and with frictional resistance torque 0.3 N.m is initiated by a string wound around its 20 mm diameter shaft and attached to a stretched spring, as shown in the figure. If the spring, which has a stiffness 2N/mm is...
23. ### Calculating Belt Pull, Drum Torque, Motor Power & Speed

Homework Statement Calculate the Belt pull, drum torque, motor power and speed required to drive a flat top belt given the following information: Belt centres are 4.0m Required speed is 18m/min Drum diameter is 300mm Belt mass is 3.0kg/m Belt is fully loaded with 32kg boxes 0.8m long Belt...
24. ### I Modal frequencies of a vibrating circular membrane? (DRUM)

I am in the process of trying to develop a modal drum synth. I have the following graphics as references for the frequencies of some of the first modes relative to the fundamental: This is a good start. But I want to be able to model more modes than just that. What is the formula required...
25. ### Force needed to rotate a drum

I need to make sure that my drum which is connected to a shaft and with load of 30kg is able to rotate at 6500rpm. mass of drum : 15kg, diameter 0.6m, length, 0.6m mass of shaft : 11kg, length = 1m, diameter, 0.043m mass of load : 15kg desired speed : 6500rpm in 30minutes. How can I determine...
26. ### I Harmonically forcing a drum membrane -- are the waves isotropic?

Suppose I apply a pair of equal and opposite harmonically varying forces perpendicular to an infinite drum membrane. Consider the following forcing functions at two nearby points,(x=0,y=a) and (x=0,y=-a), separated by a distance 2a, F(t,0,a) = Acos(ωt), F(t,0,-a) = -Acos(ωt) Let the forcing...
27. ### Torque to lift object by cable on a drum accelerating

Homework Statement An object of mass 1000 kg is lifted by means of a steel lifting cable being wound round a drum of diameter 2.5m mounted on a horizontal shaft. The drum and shaft have a mass of 1000 kg and a radius of gyration of 1.0 m. What is the torque required to give the object an upward...
28. ### How Much Torque is Required to Rotate a 1500lb Steel Drum?

We have a 1500lb steel drum that has a 8 foot diameter that we need to rotate to wrap up air filter material. The drum is supported by bearings on both sides and needs to turn at 0.02rpm. I calculated the torque, using T=Moment of Inertia * Angular Acceleration. For the moment of inertia I...
29. ### Particle motion when wrapped around drum; elastic string

Homework Statement A uniform cylindrical drum of mass M and radius a is free to rotate about its axis, which i is horizontal. An elastic cable of negligible mass and length l is wrapped around the drum and carries on its free end a mass m. The cable has elastic potential energy \tfrac12...
30. ### Pressure at bottom of oil drum

Homework Statement [/B] A vertical cylindrical container contains 5590 gallons of gasoline and is 1.38 m in radius. Due to evaporation within the tank, the pressure on the top of the fluid is 2.5 times normal atmospheric pressure. The density of gasoline is 737 kg/m3Homework EquationsThe...
31. ### Wind speed to flip a traffic drum

Hello Everyone! I was asked to calculate what is the wind speed that can flip a traffic barrel, which picture I'm attaching. It's composed of a barrel (red) and base (grey), which is filled with 14 liters of water. The picture only resembles the shape. The dimensions are these Barrel: Height...
32. ### Pulling power ratio for a cable drum at different capacities

Prior to my life as a database administrator I was a hi lead logger in coastal British Columbia, which involves harvesting logs with machines capable of putting huge strain on cable and hydraulic systems. What got me to thinking this was a friend just let me know someone we know was recently...
33. ### Engineering Motor needed to turn a Drum....

I had posted a thread several months ago about a similar problem on the same project, but the parameters have changed and my question has slightly as well. Background: For a high school engineering class, each group must design and create a prototype of a solution to an environmental related...
34. ### Predicting Peak Displacement in Imbalanced Rotating Drum

If I am attempting to prevent a suspended motor-rotating imbalanced drum of high mass from colliding with its enclosure, how can I attempt to predict the maximum displacement from a balanced center of rotation if I have only a single sensor that can accurately measure(1000 samples/sec)...
35. ### Detecting Washing Machine Drum Out Of Balance Limits

I am a noobie and I am not really sure this is the right forum to post to, so please excuse me if I am posting in the wrong place. I had considered General Physics and Classical Physics, but I hope I have made my best choice and I don't think it is acceptable to post in more than one forum...
36. ### What is the Optimal Motor Size for a 10 Diameter Drum Sander?

Hello, Hopefully I'm posting in the right section and someone can help me with this. I'm building a drum sander that will be used primarily for carving canoe paddles. I was originally planning on making it 6" in diameter with 3/4" MDF board circled glued together to create a 18" wide drum...
37. ### Rotator Drum Balancing: Adding Oil to Improve Balance?

I have a rotating drum at 3200 rpm weight 900lb Would placing a set amount of oil in the drum help the dynamic balance of it?
38. ### Drum Resonance Physics: Understanding How Tunings Affect Frequency

Hello, I have recently picked up drumming and the topic of tuning has peaked my interest. I have gone over numerous sources (academic theses, Wikipedia, HyperPhysics, etc.) trying to piece together what is occurring when drums (right now tom with two heads, batter and resonant, are of most...
39. ### Friction Direction in lever with drum

Hi guys, I trying to understand one thing that I don't know where came from. To visualize the problem I will used the drawings from book. The question is for direction of Force Fb on drawing (b) and (a). I was always learned that friction is acting on direct opposite to motion. In drawing...
40. ### Torque Required to bring a drum to rest

Homework Statement I have a problem involving a goods lift with a cage m1 = 1500kg which is raised at V = 4m/s via a winding drum with a radius of 0.6m with the help of a counter weight of m = 900kg. i am asked to find the braking torque required to bring it to rest in 1 1/3 seconds. Also i am...
41. ### What is the Acceleration (on Drum of Dancing Washing Machine?

I have bought a washing machine on sale. It is rated at: Its gross weight with clothes and water=100kg, At least 50kg of the machine's weight is due to concrete blocks attached to the inner drum. Max Centrifuging Speed=1400rpm, Max Clothes load=7kg. It dances(when taken for a spin, that is.)...
42. ### Torque Required to Rotate a Drum

I need to figure out the torque required to rotate a drum. The drum is being rotated on its perpendicular axis. I am designing a drum dumper so the drum starts upright and is rotated 135 degrees to dump its contents into a hopper in the floor. I want it to take about 5 seconds to do the rotation...
43. ### Max Drum Rotate Speed of a Concrete Mixer Drum

Homework Statement In a concrete mixer, cement, gravel, and water are mixed by tumbling action in a slowly rotating drum. If the drum spins too fast the ingredients stick to the drum wall instead of mixing. Assume that the drum of a mixer has radius ##R = 0.5 m## and that it is mounted with...
44. ### What is the Equation for Determining the Resonant Frequency of a Drum Shell?

Hi there I am currently doing a major thesis on the procedural generation of an acoustic drum kit, using PD (puredata). Now what I am actually doing is physically modelling the drum kit piece by piece, starting with the drum shell. I know that every aspect of the drum contributes to its complex...
45. ### Sound intensity/Ear drum problem

Homework Statement A source emits sound waves equally in all directions. The intensity of the waves 2.50m from the source is 1.9 * 10^-4 W/m^2 a) Find the power of the source b) If the diameter of your ear drum is 8.4 mm, how far from the source do you have to be located, so that your ears...
46. ### HNC Dynamics help please -- Hoist cable looped over a winding drum

Hi guys I am looking for help with some formulas, its for hnc mech eng, the question is as follows a winding drum with moment of inertia 24 kg m2 and a winding radius of 0.6m is used to accelerate a loaded hoist with mass of 850kg at a rate of 0.8ms by means of a cable, frictional resistance can...
47. ### Shape and Position of a Descending Rope Over a Drum: A Surprising Solution

This is a problem I thought up. If I'm correct as far as I've gone, the answer is rather surprising. A thin but 'massive' rope lies coiled on a floor. Treat the coil as a point. One end passes vertically up and over a smooth cylindrical drum radius r. The centre of the drum is height h...
48. ### Where do I place the bearings for a stable inclined rotating drum?

Homework Statement I am basically designing a rotary drum dryer and need to know the positions of the bearings for the dryer to be stable. The drum is of length 17 m with diameter 3.24 m, inclined at 2° rotating at 3.24 rpm. I need to find the distance X and OY. (Given that Y passes through...
49. ### How can I use a pressure sensor to detect drum hits for my lighting rig?

Im trying to build this lighting rig, so that every time I hit the bass drum of my drum set, the rig can light up. So I need a way to sense if I hit the drum, and then send an electrical signal to a microcontroller so the lights can light up (I don't need help with the lights, just the sensor)...
50. ### Calculating Volume of Steel for 230-L Steel Drum with Gasoline

Homework Statement A 230-l steel drum is completely full of gasoline. What total volume of steel material can be used in making the drum if the gasoline filled drum is to float in fresh water with the whole volume immersed? Homework Equations ρwater=1000 kgm^-3 ρgasoline=680 kgm^-3...