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ID Date Author Type Category Subject Text   581   Wed Oct 10 00:06:36 2012 haixing DailyProgress SUS maglev Updates: Yesterday, I stuffed the pcb boards for the hall-effect sensors (Allegro A1301      582   Thu Oct 11 00:12:11 2012 haixing DailyProgress SUS update and near-term timeline Update:     Got the rack settled and tidied up the lab a little bit.         586   Wed Oct 17 22:34:46 2012 haixing DailyProgress SUS binary output box related [power and back panel]   The chassis power part: The DC power for the binary output  6x    594   Wed Oct 24 16:13:34 2012 haixing DailyProgress SUS signal conditioning circuit design and pcb layout During last few days, I designed the signal conditioning circuit for the hall effect sensors maglev. It mainly contains two parts:      616   Wed Jan 16 12:40:39 2013 haixing, koji Summary SUS General signal conditioning circuit for maglev Here is a general signal conditioning circuit for whitening and  dewhitening of the signal from the sensor and actuator (multiple  channels)  10x    617   Wed Jan 16 16:19:25 2013 haixing, koji Summary SUS General signal conditioning circuit for maglev - I forgot why you don't have a voltage reference (cf. AD587) for the offset subtraction. - Don't you want to put an output      618   Wed Jan 16 19:41:15 2013 haixing Summary SUS General signal conditioning circuit for maglev                                619   Thu Jan 17 23:40:12 2013 haixing Summary SUS General signal conditioning circuit for maglev                                620   Mon Jan 21 22:33:26 2013 haixing Summary SUS front and rear panels for signal conditioning boxes Here are the front and rear panels for the signal conditioning boxes. The front-panel files are attached.  9x    642   Sun Jun 23 14:01:00 2013 Giorgos Mamakoukas DailyProgress SUS Thursday, June 20th 2013 - Gain of circuitry and calculations of proper resistors We started      643   Sun Jun 23 14:39:28 2013 Giorgos Mamakoukas DailyProgress SUS Finished 6 PCB Boards On Friday, we tried to get zero offset for the voltage output of the strain gauge, by replacing our fixed-value R2      645   Mon Jun 24 23:32:04 2013 Giorgos Mamakoukas DailyProgress SUS Power PCB boards and design of the box We wanted to wire up different PCB boards aiming to power our PCB boards that are connected to the strain gauge and amplify the signal.      648   Tue Jun 25 22:26:03 2013 Giorgos DailyProgress SUS Rare Panel Design and Mechanical Set-up Today, we started designing the box that will hold all of our circuits. Particularly, we used a software      650   Wed Jun 26 22:58:44 2013 Giorgos DailyProgress SUS Hall-effect sensors and transfer functions Today, I wired up the power PCB boards for the DC motors and then talked and read about Hall-effect sensors. The box that will      652   Fri Jun 28 00:30:46 2013 Giorgos DailyProgress SUS Hall-effect sensors circuits Today, we analyzed the transfer function of our circuit:      656   Fri Jun 28 16:54:02 2013 Giorgos DailyProgress SUS Low-pass filtering, Current booster, and Design of the Box Panels Today, we determined our low-pas filter circuits and its components. To achieve our cut-off filtering, we need to change the      660   Wed Jul 3 00:01:51 2013 Giorgos DailyProgress SUS DAC and ADC controllers On Monday and Tuesday, we talked about the ADC & DAC controller and the time signal input from the function generator.      661   Wed Jul 3 22:56:53 2013 Giorgos DailyProgress SUS ADC/DAC controllers, Power Boards Today, we completed the power boards and tested to make sure they work. We had a problem with the LM2991 negative voltage regulator;      662   Tue Jul 9 01:24:56 2013 Giorgos Summary SUS HE sensors test, arrangement, and offset & Strain Gauge arrangement Today, we first talked about the connection of the HE conditioning boards to the HE sensors and the arrangement of the wires on the connector.      663   Tue Jul 9 18:13:29 2013 Giorgos Summary SUS Strain Gauge Voltage Offset Strain Gauge Boards Our conditioning boards did not have a low-pass filter. That is a problem, since      665   Thu Jul 11 01:01:30 2013 Giorgos Summary SUS LED connections, Power Boards, and DC magnetic field boards LED connections We use LEDs to indicate whether our power boards work. For one power board, we      669   Tue Jul 16 00:15:08 2013 Giorgos DailyProgress SUS Digital Voltage Meters, Labeling and Rest Digital Voltage Meters We need 5V to operate our digital voltage meters that indicate the offset from      671   Tue Jul 16 22:37:22 2013 Giorgos DailyProgress SUS HE & Coils Boxes: Labeling and Power Lines for Fit-through Boards Progress on HE & Coil Boxes I used the labeling device to print labels for the HE sensors and coils' boxes.      672   Fri Jul 19 16:14:06 2013 Edward Taylor & Nic Smith DailyProgress SUS Solid works Model The solid works model for the experimental apparatus has been set up and the parts have been ordered. Today, I cleaned the cryostat      673   Mon Jul 22 18:26:30 2013 Ben DailyProgress SUS Wiring Shadow Sensor Emitter  Today I figured out the proper orientation for the SME2470 Emitter and the SMD2420 Detector which we will be using for the shadow      676   Wed Jul 24 01:00:36 2013 Giorgos DailyProgress SUS Finished 1st Stage - Installation of MatLab Today, the front panels for the HE and Coils Board arrived. I spent the day preparing the last power lines for the DC coil boards,      680   Wed Jul 24 22:10:08 2013 Giorgos DailyProgress SUS Adjusting DC motors resistors, Bode Plots in Matlab and Test Components DC motors - Tuning Adjustable Resistors I first tuned the resistors of our DC motors circuits, such that the voltage      682   Thu Jul 25 22:51:39 2013 Giorgos DailyProgress SUS Computer Feedback (Integrator & Damping), Motors' Speed and ADC bits/voltage conversion Computer Feedback Filter I installed Linux on my office computer today, because Windows was sometimes crashing.      684   Mon Jul 29 14:22:04 2013 Giorgos DailyProgress SUS ADC & DAC bits/volts conversion, HE output and saturation of Transfer Functions ADC & DAC The bits/volts conversion factor is different for our ADC and DAC. Specifically,      685   Tue Jul 30 09:20:18 2013 Giorgos DailyProgress SUS HE output & DAC output/voltage follower HE output We tested the HE output and found that all the outputs were fine, except for      686   Tue Jul 30 11:14:16 2013 Koji DailyProgress SUS HE output & DAC output/voltage follower How much was the input impedance of the DAC conditioning board before putting the high-impedance voltage follower?      688   Thu Aug 1 11:43:15 2013 Giorgos DailyProgress SUS Sensing Matrix and Calibration Sensing Matrix I calculated the entries of our sensing matrix S x = y, where S is the 6x6 sensing      689   Thu Aug 1 11:50:02 2013 Koji DailyProgress SUS HE output & DAC output/voltage follower                                692   Sat Aug 3 14:50:51 2013 Giorgos DailyProgress SUS Coupling from coil's signal Coupling from coils' signal On Thursday, I measured the HE sensors sensitivity to the magnetic field provided      693   Sun Aug 4 22:44:36 2013 Giorgos Summary SUS Volts to N conversion factors & Correction of Transfer Function As I mentioned in my previous post, the signal from the plate's displacement is strongly coupled with the coil's signal, so that our      697   Tue Aug 6 09:27:43 2013 Giorgos DailyProgress SUS Negation of Cross Coupling with Feedback Negation of Cross Coupling with Feedback In my previous post, I commented on how it is possible to negate the coupling      702   Thu Aug 8 11:32:00 2013 Giorgos Summary SUS Compensation for Cross-Coupling and Vector Fitting Cross-Coupling Measurements Before      703   Fri Aug 9 08:43:37 2013 Giorgos Summary SUS Simulink Model (1 DOF) - Step Response After minimizing the coupling effects, I created a 1 DOF Simulink Model to test whether the setup is stable      705   Mon Aug 12 07:59:58 2013 Giorgos Summary SUS DAC and ADC saturation issues Instability due to Saturation Issues       709   Tue Aug 13 21:09:44 2013 Giorgos Summary SUS Overcoming Saturation: Feedback through DC Coils and Mu-metal In my previous post, I explained the saturation issues of the ADC and DAC we faced. To prevent saturation of the DAC, we will implement      710   Tue Aug 13 22:49:45 2013 Giorgos DailyProgress SUS Model of 3 DoF DCs/ACs Matrices      711   Wed Aug 14 00:05:00 2013 Giorgos DailyProgress SUS 3DoF Stability in Simulink Today, I achieved stability in Simulink for 3DoF, including noise to the hall-effect sensors and the coil's conditioning. We had      713   Thu Aug 15 23:19:36 2013 haixing Noise Hunting SUS power spectrum and coherence of three hall effect sensors The hall effect sensor is quite noisy, and I am trying to find where the noise comes from. The first I tried today is to measure      714   Fri Aug 16 18:37:56 2013 Giorgos DailyProgress SUS Bringing Sensors closer to Plate, Correcting Offset and Gain Yesterday, we tried levitating for one degree of freedom; we failed. The plate would move back and forth the equilibrium, but      715   Sat Aug 17 18:51:39 2013 Giorgos DailyProgress SUS Noise Reduction when sensors are closer NEW HE OFFSET      724   Fri Sep 6 15:47:40 2013 haixing Summary SUS achieving stable levitation of the plate We levitate the plate by controlling three vertical degrees of freedom---one translational, and two tilts. Right now even without applying      725   Fri Sep 6 17:07:39 2013 haixing Summary SUS issues to be investigated Since the plate is levitating, we are now in the position for real work. Here are the two major issues to investigate in the plan.      727   Sun Sep 8 21:51:14 2013 haixing Misc SUS issue of matlab function "margin()" with an unstable plant I used the matlab function margin() to plot the phase and gain margins for the open-loop transfer function for maglev.      1934   Tue Oct 17 22:11:21 2023 murtaza Summary SUS Triple Suspension Simulation I attempted a matlab simulation for closing the loops on the triple suspensions. The system (hsts) was imported from https://git.ligo.org/jenne-driggers/SUS.      1935   Wed Oct 18 11:51:55 2023 murtaza Summary SUS Triple Suspension Simulation Closer look at the damping siutation. tldr: Corrected electronics gain, Signs of filters flipped, AND THE CORRECT

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